| Entries |
| Document | Title | Date |
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| 20080199179 | TRANSMISSION SYSTEM AND SYSTEM STARTUP METHOD - An exemplary aspect of the invention is a transmitter for transmitting an optical signal, comprising a level comparing unit for measuring an input level of an entered optical signal, and determining whether the input level has exceeded a preset level and a controller for performing high-speed control of the level of an optical signal to be outputted when the input level exceeds the preset level. | 08-21-2008 |
| 20080205885 | Optical Network Monitor Pcb - A fiber pigtailed network monitoring module incorporating an optical printed circuit board on which a signal-transferring connection is remotely actuated between electronic components mounted on the board and active and/or passive optical devices mounted on the board to generate remotely readable monitoring signals. | 08-28-2008 |
| 20080212960 | Methods and systems for simultaneous real-time monitoring of optical signals from multiple sources - Methods and systems for real-time monitoring of optical signals from arrays of signal sources, and particularly optical signal sources that have spectrally different signal components. Systems include signal source arrays in optical communication with optical trains that direct excitation radiation to and emitted signals from such arrays and image the signals onto detector arrays, from which such signals may be subjected to additional processing. | 09-04-2008 |
| 20080212961 | METHOD FOR IMPLEMENTING TANDEM CONCATENATION MONITORING AUTOMATICALLY AND APPARATUS THEREOF - A method for automatically implementing Tandem Concatenation Monitoring (TCM), includes: requesting a network management system for a required number of TCM levels; assigning an available TCM level to a pair of network nodes in a sub-network; performing TCM processing, mapping TCM use information into a corresponding overhead, transferring the TCM use information together with TCM overhead information downstream, and reporting TCM information to the network management system; and extracting TCM monitored information, determining transmission quality of each sub-network of a set of sub-networks, and locating a network failure. The invention also presents a device for automatically implementing TCM, including a controller, a TCM generator and a TCM terminator which cooperate with each other to automatically implementing a TCM function. The invention addresses the poor flexibility and complexity due to a static configuration by the network management system, and thus improves the flexibility of the TCM processing. | 09-04-2008 |
| 20080267621 | Optical Transceiver Calibration System and Method - An optical transceiver calibration system and manufacturing method to fabricate a dual closed loop control transceiver are provided. The calibration system and method includes measuring an operating temperature and determining operational parameters based upon the operating temperature. The operational parameters may include, for example, a target power for transmitting a digital one, a target power for transmitting a digital zero, a modulation current, and a bias current. A bias may be added to the temperature to account for the difference between the temperature at the temperature sensor and the optical equipment. The operational parameters are preferably calculated independently of each other and are used as initial values during operating modes and allow the control loop to converge more quickly. The optics data is may be scanned electronically via bar code or some other electronic format prior to test. The software residing on the module then calibrates and configures the transceiver. | 10-30-2008 |
| 20080279550 | Method and System For Measuring Average Q-Factor in Optical Networks - A technique for determining averaged Q-factor, Qavg, for an optical binary signal transmitted at a bit rate X, based on amplitude histogram evaluation and on asynchronous sampling. The technique is inexpensive since it uses sampling pulses, which have bit rate Y lower than X and are not synchronized with the optical signal. The technique proposes conducting N sampling sessions and constructing N respective amplitude histograms for the sessions, wherein an initial session is conducted at a randomly selected initial phase of the sampling pulses, and N−1 sessions are held at different phases shifted in respect of the initial phase. The technique then compares the obtained N amplitude histograms to select there-from the amplitude histogram having the minimal cumulative value of cross-point data. The averaged Q-factor is determined from the selected histogram, with accuracy comparable with that of synchronous methods. | 11-13-2008 |
| 20090028551 | DYNAMIC DIGITAL DIAGNOSTIC ALERTS - Alerts, such as laser driver current alarms, are triggered in an optoelectronic device based on dynamic digital diagnostics, such as operating temperature. Optoelectronic devices may execute microcode structured to represent a formulaic relation between a first parameter (e.g., temperature) and an indicator value for a second parameter (e.g., laser driver current). The microcode may further be structured to cause the optoelectronic device to access the first parameter, calculate an indicator value for the second parameter based on the accessed first parameter using the formulaic relation, access the second parameter, and compare the indicator value with the second parameter to determine whether to trigger an alert. If the second parameter exceeds the indicator value, the alert may be triggered, and may be indicative of potentially imminent optoelectronic device failure. | 01-29-2009 |
| 20090028552 | System and Method for Wavelength Monitoring and Control - A system and method using for wavelength monitoring and control in a WDM optical communication system. An aggregate channel monitor detects crosstalk between channels in the aggregate signal. Channel spacing may be modified by an element management system in response to the output of the aggregate channel monitor. | 01-29-2009 |
| 20090028553 | Method and apparatus of detecting abnormal behavior in a passive optical network (PON) - Environmental conditions, such as temperature or wind load, may cause a fiber-optic link to expand or contract, resulting in upstream communications drift. Current methods compensate for such drift assuming it is caused by environmental conditions; however, these methods cannot determine abnormal behavior due to fiber faults that magnify the effect of environmental changes. An example embodiment of the invention provides a method and corresponding apparatus for detecting abnormal drift behavior in a passive optical network (PON) and may include monitoring a metric representative of drift of upstream communications for an optical network unit (ONU) in a PON. The example method may detect and report abnormal behavior in the PON that cannot be fully attributed to “normal” environmental conditions, and indicate a possible fiber cable fault. An ability to detect fiber link faults may allow a system operator to proactively maintain the physical fiber before service interruptions affect an end-user. | 01-29-2009 |
| 20090028554 | METHOD AND APPARATUS FOR SAMPLED OPTICAL SIGNAL MONITORING - Monitoring an optical signal comprises sampling the optical signal from two or more distinct tap points to retrieve a sample set. Multiple such sample sets are obtained over time. A joint probability distribution or phase portrait of the sample sets is assessed for indications of optical signal quality. The tap distinction can be polarisation, for example to determine OSNR, or frequency. The tap distinction can be a time delay, which can enable diagnostic differentiation between multiple impairments, such as OSNR, dispersion, PMD, jitter, Q, and the like. Machine learning algorithms are particularly suitable for such diagnosis, particularly when provided a two dimensional histogram of sample density in the phase portrait. | 01-29-2009 |
| 20090034966 | Optical Signal Monitoring Apparatus and Method - An optical signal monitoring apparatus includes an optical interference unit, a sampling optical pulse generation unit, an optical sampling unit, a photoelectric converter, and a computation unit. The optical interference unit includes an optical brancher, a delay device, an optical phase adjuster, and an optical multiplexer. The optical brancher branches a monitoring object signal optical signal phase-modulated at a predetermined symbol rate into two optical paths. The delay device imparts delay corresponding to an integral multiple of one symbol to an optical signal branched in one optical path of the two optical paths. The optical phase adjuster brings an optical signal emitted delay device and an optical signal branched in another optical path of the two optical paths into a predetermined optical phase difference. The optical multiplexer multiplexes the optical signals which are brought into the predetermined optical phase difference, and converts the phase-modulated monitoring object optical signal into intensity-modulated light to emit the intensity-modulated light. The sampling optical pulse generation unit generates a sampling optical pulse having a period which is different from a predetermined offset time to integral multiplication of a symbol clock period corresponding to the predetermined symbol rate. The optical sampling unit samples the intensity-modulated light using the sampling optical pulse and emits an optical pulse signal. | 02-05-2009 |
| 20090047015 | Addressable Fiber Node - A system and method for providing a hybrid fiber network (HFN) means to identify a fiber node by a unique address. An addressing module is installed in proximity to, or collocated with, a fiber node. The addressing module comprises an addressing module identifier that associates the addressing module with a particular fiber node. Network parameter values are received from the fiber node by the addressing module and reported to a reporting station. | 02-19-2009 |
| 20090067832 | Method and Apparatus for Verifying Signaling Values in an Optical Distribution Network - An apparatus and a method for verifying optical system performance using a signaling value test are disclosed. After instructing the first optical interface device and the second optical interface device to enter a verification mode, the first optical interface device sends first verification data to the second optical interface device via an optical communications network. In one embodiment, the first optical interface device is an optical line termination (“OLT”) and the second optical interface device is an optical network terminal (“ONT”). Upon composing the first reply message in response to content received by the second optical interface in accordance with the first verification data, the second optical interface device forwards the first reply message to the first optical interface device. | 03-12-2009 |
| 20090074406 | METHOD FOR ALERTING USERS TO CONDITIONS AFFECTING NETWORK SERVICE - A method to alert users to network service conditions. The method includes detecting a network service condition, detecting an attempt to access at least one communication service of the network, and issuing an alert. A network for practicing the method includes at least one communication terminal and a network element that detects a network service condition, detects an attempt to access a communication service, and issues an alert of the network service condition. A network element operating in the network includes a communications interface, a processor, and a storage device for storing program instructions. The program instructions instruct the network element to detect an attempt to access a communication service and issue an alert of a network service condition. A computer program for controlling the network element includes code to detect an attempt to access a communication service and issue an alert. | 03-19-2009 |
| 20090087179 | MULTI-INTERFACE PROTOCOL ANALYSIS SYSTEM - A device may include a first network module to capture network data at a first location in a network and a second network module to capture network data at a second location in the network different from the first location in the network. The device may include a control module to receive control commands relating to the first network module and the second network module. The control module may forwarded the control commands to the first network module and the second network module. The control module may receive the captured network data from the first network module and the second network module. | 04-02-2009 |
| 20090110391 | PHOTODIODE ASSEMBLY WITHIN A FIBER OPTIC TAP AND METHODS THEREOF - An arrangement in a fiber optic network device for analyzing a set of optical signals traversing the fiber optic network device is provided. The arrangement includes a set of ports for receiving and outputting the set of optical signals. The arrangement also includes a set of photodiodes, which is configured at least for receiving and forwarding the set of optical signals. The arrangement further includes a splitter, which is configured at least for receiving the set of optical signals from a first photodiode, splitting the set of optical signals into at least a first part and a second part, and forwarding the first part to a second photodiode and the second pant to a third photodiode. The set of optical signals is configured to traverse the fiber optic network device irrespective whether power is provided to circuitry of the fiber optic network device. | 04-30-2009 |
| 20090110392 | Allocating Upstream Bandwidth in an Optical Communication Network - A gigabit passive optical network or other type of optical communication network comprises an optical line terminator that transmits data in a downstream direction to multiple optical network units. The optical network units transmit data in an upstream direction to the optical line terminator. In one aspect of the invention, the optical line terminator is operative to allocate upstream bandwidth among the optical network units, to measure usage of the allocated upstream bandwidth by the optical network units, to process the measured usage to determine a predicted variation in usage of upstream bandwidth by the optical network units, and to alter the allocation of the upstream bandwidth based on the predicted variation. | 04-30-2009 |
| 20090123149 | End-user optical transceiver unit with transmit signal attentuation - A transceiver unit for use at an end-location in a communications network includes a downstream monitor configured to monitor downstream optical signals that travel from a service provider to the end-location. The downstream optical signals carry downstream data for use by a device in communication with the transceiver unit. At least a portion of the optical path traveled by the downstream optical signals is on a common optical fiber that carries downstream optical signals for other end locations. The transceiver unit also includes an upstream attenuator configured to attenuate upstream optical signals traveling from the end-location to the service provider. At least a portion of the optical path traveled by the upstream optical signals is on the common optical fiber. The transceiver unit also includes electronics configured to operate the upstream optical attenuator in response to output from the downstream monitor. | 05-14-2009 |
| 20090142051 | COHERENT OPTICAL DETECTOR AND COHERENT COMMUNICATION SYSTEM AND METHOD - An optical device is provided with first and second inputs. A first coupler coupled is coupled to the first input and produces at least a first and second output. A second coupler is coupled to the second input and produces at least a first and second output. A third coupler is coupled to the first output of the first coupler and to the first output of the second coupler. A fourth coupler is coupled to the second output of the first coupler and to the second output of the second coupler. First and second crossing waveguides are provided with an angle selected to minimize crosstalk and losses between the first and second cross waveguides. The first crossing waveguide connects one of the first or second outputs from the first coupler with an input of the fourth coupler. The second crossing waveguide connects one of the first or second outputs from the second coupler with an input of the third coupler. A first phase shifter is coupled to the first and second waveguides. The first and second waveguides connect one of the outputs of the first or second coupler and one of the inputs of the third or fourth couplers. The first, second, third and fourth couplers, the two crossing waveguides and the phase shifter are each formed as part of a single planar chip made of an electro-optical material. | 06-04-2009 |
| 20090148157 | IDENTIFYING COMMUNICATION ERRORS CAUSED BY THE EXCHANGE OF UNSUPPORTED MESSAGES AMONG DEVICES IN A NETWORK - A method, and an apparatus, system, and sequences of instructions that operate in accordance with the method, for identifying errors in communications in a system that provides services. In the method, control messages are generated and sent to a network device. Error information generated in response to an unsupported control message being received by the network device, from at least one controlling device, is stored in the network device. The error information stored in the network device is retrieved, and errors in communications between the network device and the controlling device are identified, based on the error information retrieved. | 06-11-2009 |
| 20090154921 | Control system and method for optical communication device application - The objective of the present invention is to provide with control system and method for optical communication device application, the system and the method cooperatively controlling software and an optical device controller (hardware) contributing a plurality of loops, at least one of which having a singularity more than first order. In order to achieve the objective, the present invention provide with the following configuration. CPU performs the temperature control task as the highest priority task, and the others as lower priority tasks: such as the wavelength control task, the laser output level control task and other kind of tasks | 06-18-2009 |
| 20090162052 | LATENCY MEASUREMENT IN OPTICAL NETWORKS - A device for measuring optical latency in a test path includes an optical source to generate an optical signal. An optical modulator modulates the optical signal based on a modulation signal. An output port outputs the modulated optical signal to the test path. An input port receives a return optical signal following propagation through the test path. Latency calculating logic calculates the optical latency for the test path based on the modulation signal and the return optical signal. | 06-25-2009 |
| 20090162053 | PON system method for receiving optical signal and OLT - When a signal of weak optical power is received immediately after a signal of intense optical power, input of the signal of intense optical power readily causes saturation, and the influence interferes in the signal of weak optical power to deteriorate receiver sensitivity. Moreover, when a reverse-bias voltage of APD is changed, if a difference between the voltages is large, a next optical signal is received until the receiver sensitivity of the APD becomes stable, so that receiver sensitivity deteriorates. A DBA order is determined so that a difference in reverse-bias voltage is small, and reverse-bias voltage is controlled in line with reception timing from ONU. | 06-25-2009 |
| 20090175618 | METHOD AND APPARATUS FOR IMPLEMENTING SUBNET CONNECTION PROTECTION WITH SUB-LAYER MONITORING ON AN ODUK - The present invention relates to the field of Optical Transport Networks (OTNs) and discloses a method for implementing SNC/S on an ODUk, including: allocating a Tandem Connection Monitoring (TCM) level to an ODUk service, wherein if different TCM levels are allocated to the same node in the ODUk service, the different TCM levels are executed in the specified sequence in the same node; configuring SNC/S protection for the ODUk service. The present invention also discloses a method and an apparatus for implementing SNCP with Sub-layer monitoring (SNC/S) on an ODUk implement ODUk SNC/S protection and interoperability between multiple SNC/S entities. | 07-09-2009 |
| 20090180775 | Wireless Tuning and Reconfiguration of Network Units Including Optoelectronic Components - A method for monitoring conditions or adjusting a communications transmission characteristic, such as the optical wavelength, in a network unit such as a server, data storage unit, router, or switch, using a portable terminal having wireless RF communications capability. In one embodiment, the network unit has a tunable laser subassembly for converting and coupling an information-containing electrical signal with an optical fiber for transmitting an optical signal. The portable terminal may utilize an RFID interrogator, and the network unit may have a dynamic RFID tag to communicate identification and status information. | 07-16-2009 |
| 20090185802 | Method and apparatus for generating visible signal for data transmission frame in visible-light communication system - A method for generating a visible signal for a data transmission frame in a visible-light communication system includes: receiving specific data constituted by a plurality of frames from a sender; checking and converting a received signal strength indication (RSSI) signal measured from the sender; whenever each frame of the specific data is consecutively received, checking the converted RSSI, determining a level of a visible signal for distinctively displaying a state of a corresponding communication channel, and transmitting the level of the visible signal to the sender; and when reception of the specific data has finished, transmitting a corresponding response message to the sender, according to whether the specific data has been successfully received. | 07-23-2009 |
| 20090202238 | Method for monitoring a passive optical network using monitoring units - A method for monitoring a passive optical network ( | 08-13-2009 |
| 20090208204 | PASSIVE OPTICAL NETWORK SYSTEM - A passive optical network system according to the present invention includes an optical network unit and an optical line terminal connected to a plurality of optical network units. The optical line terminal has: an interface which receives from the optical network unit, a logical link assignment request message containing a communication priority for deciding a priority of a communication flow between a source terminal and a destination terminal, from the destination; and a control unit which assigns a logical link identifier for identifying a communication flow to the logical link assignment request message received from the interface and controls the interface so as to communicate with the optical network unit by using the communication priority. | 08-20-2009 |
| 20090208205 | Photonic Based Cross-Correlation Homodyne Detection with Low Phase Noise - In one aspect, this document provides an implementation of a system for characterizing an oscillator. This system includes an input port that receives an oscillation signal from an oscillator under test; an input port signal splitter that splits the received oscillation signal into a first oscillation signal and a second oscillation signal; a first photonic signal processing branch circuit that processes the first oscillation signal to produce a first branch output signal; a second photonic signal processing branch circuit that processes the second oscillation signal to produce a second branch output signal; a dual channel signal analyzer that receives the first and second branch output signals to measure noise in the received oscillation signal; and a computer controller that controls the first and second photonic signal processing branch circuits and the dual channel signal analyzer to control measurements of the noise in the received oscillation signal. | 08-20-2009 |
| 20090214200 | TUNABLE OPTICAL DISCRIMINATOR - There is provided a method and apparatus for tuning an optical discriminator to the carrier frequency of an optical signal to allow superior reception of said signal. The carrier frequency of the signal is dithered during a test phase in order to provide information that allows a subsequent tuning phase to optimise the reception of the optical signal, as measured by a signal quality metric. The tuning phase may comprise adjustment of one or both of the carrier frequency and the optical discriminator. | 08-27-2009 |
| 20090214201 | MONITOR CIRCUIT FOR MONITORING PROPERTY OF OPTICAL FIBER TRANSMISSION LINE AND QUALITY OF OPTICAL SIGNAL - An optical reception circuit generates optical electric field data by performing coherent reception of an optical signal transmitted via an optical fiber transmission line. An FIR filter filters the optical electric field data so that the optical signal is equalized. A quality monitor unit calculates the average value and the standard deviation value of the amplitude of the optical signal on the basis of the equalized optical electric field data, and further calculates an optical signal-to-noise ratio on the basis of the calculated values. | 08-27-2009 |
| 20090220226 | Method for coordinating measurements and calibrations in a passive optical network - Method for coordinating measurements and calibrations in a passive optical network, PON, in particular in a Gigabit PON, the method comprising: generating, in an optical line termination ( | 09-03-2009 |
| 20090232494 | OPTICAL NETWORK, MONITORING UNIT AND MONITORING METHOD - An optical network having a tree-like structure with a main line and a plurality of branches, at least two of the branches comprising a monitoring unit for upstream signalling to the main line, wherein each of the monitoring units comprises a signal generation unit with a light source for generation of a pre-defined optical signal, and the monitoring units are construed to generate pre-defined optical signals which are different from each other, as well as a monitoring unit for generating a periodic upstream signal in such an optical network and a method for monitoring such an optical network. | 09-17-2009 |
| 20090238560 | Systems and Methods for Determining an AC/DC Cross-Calibration Coefficient - A first signal shaper generates a first signal having a first asymmetry. A second signal shaper generates a second signal having a second asymmetry different from the first asymmetry. The first and second signals have approximately the same peak-to-peak amplitude. An AC measurement element acquires a first scaled representation of the shape of the first signal and a second scaled representation of the shape of the second signal. A DC measurement element receives the first signal and the second signal and generates a first value responsive to the first signal and a second value responsive to the second signal. A processor calculates a first factor responsive to the shape of the first signal and a second factor responsive to the shape of the second signal. The processor applies the first and second factors and the first and second values in a function that generates the AC/DC cross-calibration coefficient. | 09-24-2009 |
| 20090238561 | Method and apparatus for measuring quality of traffic performance in a passive optical network (PON) - Systems and methods for measuring and reporting the performance of communications traffic in a Passive Optical Network (PON) are disclosed. According to the disclosed embodiments, the PON network may include an Optical Line Terminal (OLT) and multiple Optical Network Terminals (ONTs) downstream of the OLT. By aggregating multicast communications traffic received by the ONTs at a point downstream of the ONTs, selectively accessing the aggregated communications traffic, collecting information representative of performance of each selected communications traffic, and reporting the collected information upstream to a network management node, communications traffic in the PON network may be tested in both downstream and upstream directions. Advantages provided by the disclosed embodiments include simplification of the testing process by consolidating all performance reports in one place, enabling more flexible testing, and creating value from the collected information, such as by using the collected information in conjunction with simulation tools during customer deployment. | 09-24-2009 |
| 20090238562 | OPTICAL TRANSMISSION APPARATUS, SUBSCRIBER APPARATUS AND OPTICAL COMMUNICATION SYSTEM - An optical transmission apparatus communicable with a plurality of subscriber including a delay measuring part for detecting a response delay time from each subscriber based on reception timing of the delay measurement response optical packet, a detection part for detecting a received optical level of the delay measurement response optical packet received by the reception part and a state determination part for determining quality of an optical transmission state between the optical transmission apparatus and each subscriber based on the received optical level of the delay measurement response optical packet of each of the plurality of subscribers. | 09-24-2009 |
| 20090245784 | CENTRALIZED CONGESTION AVOIDANCE IN A PASSIVE OPTICAL NETWORK - In one aspect, a method for congestion avoidance in a passive optical network having an optical line terminal communicatively connected to a plurality of optical network termination devices is provided. A dynamic bandwidth allocation information is periodically requested from the optical network termination device and the optical line terminator receives the response to the request. An adjusted bandwidth allocation for the optical network termination device is determined by the optical line terminator. The optical line terminator determines a packet-drop command to be taken at the optical network termination device. The adjusted bandwidth allocation and the packet-drop command are sent to the optical network termination device. | 10-01-2009 |
| 20090245785 | OPTICAL RECEIVER - An optical receiver in which a failure in a certain channel affects no other channels is provided. An optical receiver inputs DQPSK optical signals supplied from the outside into each of first and second delay interferometers and reproduces optical output from the first and second delay interferometers as binary non-return-to-zero (NRZ) signals of first and second channels by first and second An optical receiving elements. The delay time of the first and second delay interferometers is performed a feedback control by a control system independent for each of the first and second channels. | 10-01-2009 |
| 20090269054 | Methods and Systems for Testing a Fiber Optic Network - The present disclosure relates to a method for testing a fiber optic network including a fiber distribution hub. The method includes providing a test splitter within the fiber distribution hub to provide optical connectivity between an F1 fiber and at least a portion of an F2 fiber network. The method also includes testing sending a test signal from the F1 fiber through the test splitter to the F2 fiber network, and replacing the test splitter after testing has been completed. | 10-29-2009 |
| 20090279885 | CONTROL CIRCUIT FOR OPTICAL TRANSMITTER/RECEIVER - A control circuit for an optical transmitter/receiver that transmits/receives an optical signal, comprises: a memory having a digital value storage area and an area that stores limit values; a register; an analog/digital conversion circuit that receives analog signals indicating operating parameters of the optical transmitter/receiver, converts the analog signals to respective digital values, and stores the digital values in the memory; a comparison logical circuit that compares the digital values with the limit values, generates flag values, and stores the flag values in the register; and an outside interface that allows an outside host apparatus to access the memory and the register to read the flag values and monitor an operating condition of the optical transmitter/receiver from outside. | 11-12-2009 |
| 20090290869 | VEHICLE-MOUNTED RECEIVER APPARATUS - An in-vehicle receiving apparatus to receive transmitted data from an on-road device having a reference position setting device to set a position satisfying a predetermined reception condition, as a reference position; a real receiving situation acquiring device to acquire a receiving situation of the transmitted data in a zone from the reference position set by the reference position setting device, to a predetermined position; a designed receiving situation estimating device to estimate a receiving situation of the transmitted data in a zone from a design position to the predetermined position when the predetermined reception condition is satisfied at the design position; and an error calculating device to calculate a distance error of the reference position from the design position, based on the receiving situation acquired by the real receiving situation acquiring device and the receiving situation estimated by the designed receiving situation estimating device. | 11-26-2009 |
| 20090290870 | Apparatus and method for adjusting optical signals - An optical signal adjustment apparatus detects an optical signal intensity level of signal light components with multiple different wavelengths for each of the wavelengths in an optical detection unit and adjusts the signal light components with the wavelengths for each of the wavelengths in a variable optical attenuator to make the optical signal intensity levels of the signal light components uniform. The apparatus includes a control unit configured to successively select a detection signal associated with each of the wavelengths from the optical detection unit and generate a control signal for the wavelength based on the selected detection signal. The control signal generated by the control unit is supplied to the variable optical attenuator associated with the selected detection signal. | 11-26-2009 |
| 20090297142 | MODULATION BASED OPTICAL SPECTRUM ANALYZER - An optical spectrum analyzer and a method of spectrally analyzing an optical signal. The optical spectrum analyzer includes a wave shaper such as an optical modulator that shapes an optical signal, a dispersive element such as a dispersive fiber in which the shaped optical signal is dispersed, a detector that provides an output signal indicative of the dispersed shaped optical signal, and a signal processor that analyzes the output signal, for example by calculating a transform such as an inverse Fourier transform or a Fourier transform of the output signal, to provide a frequency spectrum of the optical signal. | 12-03-2009 |
| 20090317075 | Optical Balanced Receiver and IQ Receiver with Balanced Compensation - An optical balanced receiver including an optical coupler for combining input optical information signal and optical reference signal and outputting two optical interfering signals whose phases are opposite to each other, two photodetectors for receiving the two optical interfering signals and outputting detection signals as electrical signals having the amplitudes corresponding to the interference intensities of the received optical interfering signals, a balance compensation type difference device for compensating an intensity fluctuation component added to a difference signal of the two detection signals due to the difference in amplitude and/or delay between the detection signals output from the two photodetectors in accordance with an input control signal, and outputting the compensated difference signal of the two detection signals, and a control circuit for outputting the control signal to the balance compensation type difference device. | 12-24-2009 |
| 20090317076 | WDM TRANSMISSION APPARATUS - A WDM transmission apparatus to receive or relay WDM light in a WDM transmission system, includes a measuring unit configured to measure an optical level of each channel transmitted by the WDM light; an adjusting unit configured to adjust a resolution of the measuring unit; and a processing unit configured to obtain, for each channel, optical level information which represents an optical level respectively measured with a resolution corresponding to a bit rate of a transmission signal of each channel. | 12-24-2009 |
| 20090324216 | OPTICAL ACTIVATION OF ONE OR MORE COMMUNICATION UNITS IN A SURVEY SYSTEM - To control activation of one or more communication units in a survey system that performs surveying of a subterranean structure, optical activity on at least one optical link connected to at least one communication unit that is part of a survey system is detected. In response to determining that the optical activity has a characteristic that satisfies a predetermined criterion, the at least one communication unit is awakened. | 12-31-2009 |
| 20090324217 | METHOD AND APPARATUS FOR REMOTE COMMUNICATION USING THE INTERPRETATION OF THERMOLUMINESCENCE OR PHOTOLUMINESCENCE SIGNALS - A method for remote communication using the interpretation of thermoluminescence or photoluminescence signals uses a property of photoluminescence or of thermoluminescence when it is caused by entangled trapped electrons. In this case, stimulation of deexcitation of trapped electrons by heat or radiation occurs when the deexcitation thermal energy is approximately equal to the trap-emptying energy. Stimulation by a temperature rise of a “master” sample induces luminescence of a remote “slave” “entangled” sample, which is reproduced on lowering the temperature of the “master” sample whatever the distance and the media separating the “master” sample and the “slave” sample. This teaching and its generalization to other forms of stimulation is used by the method of interpreting the quantum reception measurements so as to determine, using a correlation method, the transmission of information or commands. This method is particularly suitable for carrying out communication with submarines, communication in mine galleries, or communication with space probes. | 12-31-2009 |
| 20090324218 | Optical signal detection method, and light receiving apparatus using the same - A signal detection method used in an optical receiver apparatus detects the variation of an optical input level from the presence or absence of a clock signal and appropriately controls a dispersion compensator, thereby enabling the presence or absence of an input signal to be correctly determined. The signal detection method includes: detecting the level of input light of an optical amplifier, storing the level of the detected input light, comparing the level of the stored previous input light with the level of current input light, detecting the level variation of the input light by the comparison to detect the state change of the presence or absence of an optical signal, performing a dispersion compensation on the input light, and extracting a clock from an optical input. When the level variation of the input light is detected, the presence or absence of the optical signal of the input light is determined from the presence or absence of the clock signal. When the clock signal is not extracted, the dispersion amount is swept. | 12-31-2009 |
| 20100008662 | Method and system for closed loop control of an optical link - A method of closed loop control for an optical link is presented, utilizing a copper feedback connection between the optical transmitter and optical receiver, suitable for short distance applications. An architecture is provides that may be used to define and maintain an optimum optical launch power for a defined bit error rate, guaranteeing extinction ratio and absolute optimum operating power. The invention also includes the use of such a loop in achieving fast link initialization and dynamic optimization to compensate for all effects of time and temperature for all components within the link. | 01-14-2010 |
| 20100027993 | TRANSMISSION PATH MONITORING METHOD AND DEVICE - Upon transmission path monitoring, when a monitoring signal responded by one of optical repeaters provided in a main signal transmission path is superposed on an optical main signal and sent out to the main signal transmission path, the optical main signal is branched to optical fibers, that are optical transmission paths, provided separately from the main signal transmission path and each provided with optical repeaters corresponding to the optical repeaters provided in the main signal transmission path, an optical main signal is selected from a desired optical fiber to be monitored from among the optical transmission paths and the monitoring signal is extracted from the optical main signal selected, thereby checking the quality of the desired optical fiber. | 02-04-2010 |
| 20100034534 | PASSIVE OPTICAL NETWORK SYSTEM, OPTICAL LINE TERMINATOR AND OPTICAL NETWORK UNIT - In a PON, at the time of ranging, an OLT (a master station) measures an optical level of a signal from at least an ONU (a slave station) capable of communicating at plural transmission speeds. The OLT determines the transmission speed applied to the ONU according to the measured level. Incidentally, the ONU may measure an optical level of a ranging request signal and determine the transmission speed. At a normal operation, when the OLT sends information of plural different transmission speeds to the ONU, a timing when a next frame reaches and transmission speed information are notified to the ONU. Based on the timing, the ONU receives only data of the transmission speed that can be handled. Besides, the OLT switches the transmission speed to receive data based on a grant designation transmitted from the plural ONUs to the OLT. | 02-11-2010 |
| 20100034535 | METHOD FOR MANAGING THE CONNECTION IN AN OPTICAL ACCESS NETWORK, CORRESPONDING PLATFORM, CENTRAL OFFICE, AND COMPUTER PROGRAM PRODUCT - A method is provided for managing connections in an optical access network. Also provided are a corresponding platform, exchange, network and computer software product. The method manages connections of a plurality of user modules to a plurality of transmission modules of an exchange in an optical access network. The management method includes a dynamic re-arrangement of the connection of at least one of the user modules to at least one of the transmission modules according to at least one predetermined optimization criterion. | 02-11-2010 |
| 20100046941 | METHOD AND ARRANGEMENT FOR CONTROLLING A REGENERATOR FOR DATA BURST SIGNALS OF A SYSTEM COMPRISING POINT-TO-MULTIPOINT CONNECTIONS, TRANSMISSION SYSTEM COMPRISING POINT-TO-MULTIPOINT CONNECTIONS, AND REGENERATOR - A system which comprises point-to-multipoint connections and in which a portion of a downstream signal is extracted at a point located between a central network unit and a plurality of user network units, a header of the downstream signal is read and analyzed, and the header data obtained in this manner is used for controlling a regenerator provided in the upstream path for the data burst signals. The header data contains the beginning and end of the burst of the data burst signals, thus making it possible to reliably generate a temporal triggering signal for the regenerator. | 02-25-2010 |
| 20100054733 | ACCESSING TRANCEIVER LINK INFORMATION FROM HOST INTERFACE - Embodiments of the present invention include systems and methods for accessing the digital diagnostic data and controller data of a remote transceiver module via the diagnostic port of a local transceiver. The invention involves modulating high-speed data and out-of-band data as a double modulated signal, wherein the out-of-band data includes the remote transceiver controller and digital diagnostic data, which is subsequently accessible by an external user device from the diagnostic port of the local transceiver. | 03-04-2010 |
| 20100054734 | FIBER OPTIC TRANSCEIVER MODULE WITH OPTICAL DIAGNOSTIC DATA OUTPUT - Exemplary embodiments of the invention relates to an optical transceiver module having a diagnostic assembly, wherein the diagnostic assembly is configured to visually display the operational status of the transceiver transmitter and receiver components while optically transmitting diagnostic information. The transceiver operational status is accessible while the transceiver operates in conjunction with an external host and may be ascertained in real time without interrupting normal transceiver operation or suspending the transmission of data over optical fibers. | 03-04-2010 |
| 20100067902 | OPTICAL TRANSMITTER ERROR REDUCTION USING RECEIVER FEEDBACK - Described is a method of reducing transmitter error in an optical communications channel. An optical signal transmitted from an optical transmitter that has impairment due to transmitter error is processed to generate a digitally-equalized signal. A nonlinear characteristic of the digitally-equalized signal that relates to the transmitter error is determined. An optical control signal comprising data that are based on the nonlinear characteristic is transmitted to the optical transmitter. The optical transmitter modifies a transmitter parameter in response to the optical control signal to change the nonlinear characteristic and thereby reduce the impairment. | 03-18-2010 |
| 20100098411 | OPTICAL RECEIVER AND OPTICAL RECEIVING METHOD - An optical receiver includes a photo-detector that converts a received optical signal into an electric signal and outputs the electric signal, a converter that converts the electric signal into a parallel data signal and outputs the parallel data signal, and parallel-number changer changing a parallel number of the parallel data signal in accordance with a bit rate of the optical signal and outputting the parallel data signal having the changed parallel number. | 04-22-2010 |
| 20100098412 | MANAGED PON REPEATER AND CROSS CONNECT - One embodiment provides an intelligent passive optical network (PON) node. The intelligent PON node includes a number of optical line terminal (OLT)-side transceivers coupled to a first optical fiber, a number of optical network unit (ONU)-side transceivers, a switching mechanism configured to couple the OLT-side transceivers and the ONU-side transceivers, and a controller configured to control the coupling operation of the switching mechanism. The OLT-side transceivers are configured to transmit optical signals on a number of wavelength channels to and receive optical signals on a number of wavelength channels from the OLT. A respective ONU-side transceiver is configured to transmit optical signals to and receive optical signals from a downstream PON. | 04-22-2010 |
| 20100104277 | MODULATOR FOR FREQUENCY-SHIFT KEYING OF OPTICAL SIGNALS - Described are an FSK modulator and a method for large-alphabet FSK modulation. The FSK modulator and the method are based on filtering of a multi-tone optical source such as a mode-locked laser which provides a comb distribution of tones. A frequency-selective component selects for transmission a subset of the tones. In various embodiments the frequency-selective component is a Mach-Zehnder interferometer filter or a microring resonator filter. A second frequency-selective component selects a subset of the tones from the comb distribution provided by the first frequency-selective component. Still more frequency-selective components can be used according to the number of tones supplied by the multi-tone optical source to the FSK modulator. The optical signal exiting the last frequency-selective component includes only a single tone which corresponds to the symbol to be transmitted. | 04-29-2010 |
| 20100111523 | EPON WITH POWER-SAVING FEATURES - One embodiment provides a system for power saving in an Ethernet Passive Optic Network (EPON). The system includes an optical line terminal (OLT), an optical network unit (ONU), a traffic-detection module configured to detect status of traffic to and from the ONU, and a power-management module configured to place the ONU in sleep mode based on the detected traffic status. The ONU includes an optical transceiver that includes an optical transmitter configured to transmit optical signals to the OLT and an optical receiver configured to receive optical signals from the OLT. | 05-06-2010 |
| 20100119225 | Fiber optic telecommunications card with security detection - A transceiver card for a telecommunications box for transmitting data over a first optical fiber and receiving data over a second optical fiber. The card has transmitter for transmitting data over the first optical fiber, the transmitter having a laser and a modulator, a fiber output optically connected to the laser for connecting the first optical fiber to the card, a fiber input for connecting the second optical fiber to the card, a receiver optically connected to the fiber input for receiving data from the second optical fiber, and an OTDR optically connected between the transmitter and the fiber output or between the receiver and the fiber input. An energy level detector is also provided between the receiver and the fiber input. | 05-13-2010 |
| 20100129073 | OPTICAL TRANSMISSION SYSTEM AND ELECTRONIC DEVICE USING THE SAME - A light transmission system has a light transmission module having a light transmission path that transmits a data signal as an optical signal, wherein the light transmission module converts the optical signal transmitted through the light transmission path to an electrical signal and outputs the converted optical signal as a binarization signal, an electrical transmission path that outputs a clock signal as a binarization signal, a reception processing unit that performs a reception process on each of the data signal and the clock signal, and a first delay unit that delays a rise start time of the clock signal with respect to a rise start time of the data signal for the binarization signal. A delay amount of the clock signal by the first delay unit is a time less than or equal to a maximum value of a data dependency jitter (DDJ). | 05-27-2010 |
| 20100135653 | OPTICAL NETWORK MONITORING SYSTEM AND METHOD THEREOF - An optical network monitoring system and method thereof are proposed. An optical line terminal (OLT) transmits a first optical signal to a plurality of optical interference devices. After the first optical signal passes the optical interference devices, the optical interference devices reflect back a plurality of second optical signals corresponding to the optical interference devices respectively to the optical line terminal. The second optical signals have different optical path differences. An optical/electrical converter unit converts each of the second optical signals into an electrical signal. A spectrum analyzing unit analyzes the electrical signal to extract a frequency component of the electrical signal, thus the fiber connection status to each optical network unit in the optical network system could be obtained. Therefore, the purpose of monitoring the optical network system is achieved. | 06-03-2010 |
| 20100135654 | MEASURING DIFFERENTIAL GROUP DELAY IN AN OPTICAL FIBER CONNECTION - The differential group delay is measured in an optical fiber connection for an optical signal undergoing a phase modulation BPSK or DPSK by a digital signal at a given rate. A polarization controller at an emerging end of the connection scans polarization states of the modulated optical signal. An emulator iteratively introduces an additional delay in the modulated optical signal emerging from the connection and combines the delayed modulated optical signal and the non delayed modulated optical signal which are both polarized along two orthogonal axes into a resulting optical signal. A polarization controller and a fixed polarizer select a polarization state in the resulting optical signal along one of bisecting lines of the orthogonal axes into a linearly polarized signal. An eye diagram or a spectrum of the polarized signal is acquired by a digital oscilloscope or an optical spectrum analyzer to determine the differential group delay. | 06-03-2010 |
| 20100142941 | System and method for obtaining optical signal information - A system is provided for identifying signal propagation information. The system includes at least one component configured to receive an optical input signal and to emit an optical output signal. The emitted optical output signal is representative of the optical input signal, and is associated with characteristic information indicative of the component. A processor is also included, the processor being configured to sense the optical output signal and correlate the characteristic information with said component. | 06-10-2010 |
| 20100142942 | Apparatus for Transferring Optical Data in Optical Switching System Using Time Synchronization - Provided is an apparatus for transferring optical data in an optical switching system using time synchronization. The apparatus performs time synchronization on optical data to input the optical data at regular intervals through fiber delay line for time synchronization respectively disposed on input ports. Therefore, the apparatus can efficiently reduce a data blocking rate in comparison with a conventional optical switching system using an asynchronous electric buffer without a synchronous process, and achieve the same performance as conventional asynchronous technology despite using fewer wavelength converters and buffers, thus reducing system cost. In addition, using dynamic time synchronization modules, the apparatus performs time synchronization for minute time variation due to an environment such as temperature. | 06-10-2010 |
| 20100142943 | DYNAMIC PERFORMANCE MONITORING SYSTEMS AND METHODS FOR OPTICAL NETWORKS - The present disclosure provides dynamic performance monitoring systems and methods for optical networks to ascertain optical network health in a flexible and accurate manner. The present invention introduces accurate estimations for optical channel performance characteristics based either on existing channels or with a dynamic optical probe configured to measure characteristics on unequipped wavelengths. Advantageously, the dynamic performance monitoring systems and methods introduce the ability to determine physical layer viability in addition to logical layer viability. | 06-10-2010 |
| 20100142944 | METHOD, SYSTEM AND DEVICE FOR PASSIVE OPTICAL NETWORK DATA TRANSMISSION - A central office optical line terminal (S-OLT) and a local optical line terminal (L-OLT) are connected to through a transmission link form a transmission network. The S-OLT sends service data sent by a service network to the L-OLT through a transmission channel, receives the service data sent by the L-OLT from the transmission channel, and sends the service data to the service network. The L-OLT receives the service data sent by the S-OLT from the transmission channel and sends the service data to an optical network unit (ONU), and sends the service data sent by the ONU to the S-OLT through the transmission channel. Thus, the service data of the L-OLT is sent to the service network through the S-OLT, thereby solving a problem in the existing PON that the service data requires another transmission of the transmission network to reach the service network. | 06-10-2010 |
| 20100150548 | Optical Signal Quality Monitoring Apparatus and Method - A sampling optical pulse generation unit emits a sampling optical pulse. The sampling optical pulse has a period different from a predetermined offset time to integral multiplication of a clock period of a data signal, and the data signal modulates an optical signal of a monitoring target. An optical sampling unit performs sampling of the optical signal of the monitoring target using an electroabsorption optical modulator. The electroabsorption optical modulator has a characteristic in which an absorption index is changed with respect to light propagating through an optical path according to a level of an electric field. The optical signal of the monitoring target is input into one of two optical terminals of the electroabsorption optical modulator. The sampling optical pulse is input into another of the two optical terminals through a photocoupler. The absorption index with respect to the optical signal of the monitoring target is lowered by generating a mutual absorption saturation characteristic of the electroabsorption optical modulator when the sampling optical pulse is supplied, and the sampling of the optical signal of the monitoring target is performed to output an optical pulse signal from the other of the two optical terminals through the photocoupler. | 06-17-2010 |
| 20100150549 | Test interface device, test system and optical interface memory device - A test interface device includes a serializer, an optical transmitter, an optical receiver, and a deserializer. The serializer receives parallel test signals from automatic test equipment, and serializes the parallel test signals into a serial test signal. The optical transmitter converts the serial test signal into an optical test signal. The optical receiver receives the optical test signal from the optical transmitter, and converts the optical test signal into the serial test signal. The deserializer deserializes the serial test signal into the parallel test signals, and transmits the parallel test signals to a device under test. As a result, signal transfer speed may be improved and optical resource usage may be reduced. | 06-17-2010 |
| 20100158515 | TRANSMISSION SYSTEM AND TEST APPARATUS - Provided is a transmission system that transmits data, comprising a modulating section that modulates amplitude of a predetermined carrier signal according to the data to be transmitted; an electro-optical converting section that converts a modulated signal output by the modulating section into an optical signal; an optical fiber that transmits the optical signal; an optical-electric converting section that converts the optical signal transmitted by the optical fiber into a current signal; a current-voltage converting section that linearly converts the current signal into a voltage signal; and a demodulating section that demodulates the voltage signal. | 06-24-2010 |
| 20100172645 | BANDWIDTH-ON-DEMAND SYSTEMS AND METHODS - The present disclosure relates to systems and methods for providing bandwidth-on-demand telecommunications services over next-generation optical transport networks (NG-OTN). One embodiment of a system providing bandwidth-on-demand services includes a next-generation optical transport network (NG-OTN) having an intelligent control plane (ICP) and new-generation synchronous optical network (NG-SONET) capabilities. A next-generation operation support subsystem (NG-OSS) is communicatively coupled to the NG-OTN. The NG-OTN and the NG-OSS are configured to provide the bandwidth-on-demand services. | 07-08-2010 |
| 20100178051 | OPTICAL COMMUNICATION SYSTEM AND METHOD FOR OPERATING THE SAME - An optical communication system has a master station and a plurality of slave stations connected thereto via an optical fiber network, which is provided with an optical splitter and a relay unit which relays signals transmitted/received between the master station and the plurality of slave stations. The master station includes a first controller for performing ranging between the master station and the relay unit, and the relay unit includes a second controller for performing ranging between the relay unit and the plurality of slave stations. The master station determines, on the basis of the results of ranging performed by the first and second controllers as well as reports from the slave stations, timings for the slave stations to transmit signals to the master station, and receives signals multiplexed through the optical fiber network from the slave stations. | 07-15-2010 |
| 20100189434 | DISPERSION SCHEME FOR PHYSICAL LAYER DIAGNOSIS IN BI-DIRECTIONAL DUAL-FIBER OPTICAL NETWORKS - Methods, systems, and computer program products are provided for measuring modal dispersion in a bi-directional dual-multimode fiber optic network (BDON). A modal dispersion measurement system includes a computer processor that is programmed to receive a first pulse width of a first pulse. The first pulse may be communicated over the BDON that is coupled to the processor. A second pulse width of a second pulse is received, the second pulse width being indicative of the modal dispersion. The second pulse width and the first pulse width are compared by the computer processor to determine a distortion error. A measurement of the modal dispersion is validated in accordance to the distortion error. | 07-29-2010 |
| 20100215361 | CONFIGURATION OF PASSIVE OPTICAL NETWORKS INCLUDING CASCADED ARRAY WAVEGUIDE GRATINGS - Techniques for partitioning and/or combining at least a portion of an optical network tree including one or more array waveguide gratings (“AWGs”) and fibers in wavelength division multiplexing (“WDM”) passive optical networks (“PON”) with cascaded AWGs are disclosed. Example methods include deriving the optimal positions for the AWGs to minimize fiber cost and then determining the arrangement of cascaded AWGs to minimize the total cost of AWGs and fibers. Determining the arrangement of cascaded AWGs may include recursive partitioning followed by recursive combination. An example recursive partition-combination based algorithm for optimizing a tradeoff between the AWG cost and the fiber cost is disclosed. | 08-26-2010 |
| 20100215362 | CUSTOMER PREMISES OPTICAL NETWORK UNIT AND OPTICAL TRANSMISSION SYSTEM - An optical network unit according to the present invention is provided as comprising a configuration that component units built therein are grouped for at least two sheets of substrate modules and arranged thereat. There are provided individual embodiments: (a) arranging an L2 layer and a part of the component unit of an L1 layer at a first substrate module, meanwhile, arranging the left part of the component unit of the L1 layer at a second substrate module; (b) arranging the component units of the L1 layer and of the L2 layer at the first substrate module and the second substrate module individually by grouping therefor; and (c) arranging the component units of the L2 layer and of the L1 layer at the first substrate module and the second substrate module respectively. | 08-26-2010 |
| 20100220996 | Path Computation Element Protocol (PCEP) Operations to Support Wavelength Switched Optical Network Routing, Wavelength Assignment, and Impairment Validation - An apparatus comprising a path computation element (PCE) configured for at least partial impairment aware routing and wavelength assignment (RWA) and to communicate with a path computation client (PCC) based on a PCE protocol (PCEP) that supports path routing, wavelength assignment (WA), and impairment validation (IV). The PCEP comprises at least one operation selected from the group consisting of a new RWA path request operation and a path re-optimization request operation. Also disclosed is a network component comprising at least one processor configured to implement a method comprising establishing a PCEP session with a PCC, receiving path computation information comprising RWA information and constraints from the PCC, and establishing impairment aware RWA (IA-RWA) based on the path computation information and a private impairment information for a vendor's equipment. | 09-02-2010 |
| 20100226644 | METHODS AND SYSTEMS FOR DETECTING SMALL SPAN LOSS CHANGES IN FIBER OPTIC NETWORKS - The present disclosure provides methods and systems for detecting small span loss changes in fiber optic networks. The present invention utilizes existing equipment without additional hardware to provide span loss measurements in a highly accurate manner. In an exemplary embodiment, the present invention utilizes power measurements associated with an optical supervisory channel (OSC) at both ends of a fiber span. These measurements are periodically sampled taking into account propagation delay along the fiber span. Further, these measurements are integrated or time-averaged to account for temporary fluctuations. The present invention can be utilized for intrusion detection (i.e., unwanted fiber taps), fiber degradation, and fiber aging performance. The present invention satisfies the criteria for a feasible (i.e., makes use of current architecture), cost-effective (i.e., does not require additional hardware), and highly accurate solution (i.e., capable of detecting span loss changes of 0.01 dB or 0.03%). | 09-09-2010 |
| 20100226645 | Hybrid communication system providing grouping, localization and/or commissioning capability - Distinct physical channels in a network are exploited to provide capabilities that go significantly beyond conventional hybrid networks. In a first aspect, distinct physical channels are employed to determine physical relationships of the nodes with respect to each other. For example, whether or not the nodes of an RF wireless system are in the same room of a building can be determined by using optical messages passed between the nodes. In a second aspect, a first physical channel is employed for synchronized broadcasting, and a second physical channel is employed to enhance the capabilities of the synchronized broadcast network. For example, the nodes of an RF wireless broadcast network can be selectively commissioned (i.e., sensitized) with optical signals to commands that are broadcast on the RF network. | 09-09-2010 |
| 20100232787 | Optical signal sampling apparatus and method and optical signal monitor apparatus and method using the same - The optical signal sampling apparatus and the optical signal monitor apparatus are configured of an optical combiner for combining an optical signal to be sampled and a sampling light pulse with each other and an electroabsorption modulator. The electroabsorption modulator has two optical terminals for inputting/outputting the light and a power supply terminal for applying the electric field to the optical path connecting the two optical terminals, and has such a characteristic that the absorption rate of the light propagating through the optical path changes in accordance with the magnitude of the electric field, the light emitted from the optical combiner is received by one of the two optical terminals, and the absorption rate is increased when the sampling light pulse is not incident while the absorption rate is decreased when the sampling light pulse is incident. Further, the apparatuses include a DC power supply for applying a predetermined DC voltage to the power supply terminal and an optical separator for selectively emitting the optical signal component to be sampled, of the optical signals emitted from another of the two optical terminals. | 09-16-2010 |
| 20100232788 | Dual Stage Carrier Phase Estimation in a Coherent Optical Signal Receiver - A system and method implementing dual stage carrier phase estimation (CPE) in a coherent receiver for an optical fiber communication system. In the first stage, a feed-forward CPE is implemented to make an initial carrier phase estimation of a training sequence. The initial carrier phase estimation is coupled to the second stage which implements a decision-feedback CPE. After a training period, accurate bit decision for system traffic can be achieved using the decision-feedback CPE. | 09-16-2010 |
| 20100232789 | Modified Michelson Interferometer Structure for Inter-Symbol Interference-Suppressed Colorless DPSK Demodulation - An optical device includes an interferometer for a received optical differential phase shift keying DPSK signal, and an equalizer integrated with the interferometer in a manner for reducing from optical filtering effects an interference by signal bits of the DPSK signal with signal bits of a contiguous DPSK signal. The interferometer is a Michelson delay interferometer type, but can also be a Mach-Zehnder delay interferometer type on fiber, waveguide or other optical structure. The equalizer is a Fabry-Perot type equalizer, but can be a ring resonator type or a fiber based equalizer. | 09-16-2010 |
| 20100239244 | System and method for measuring the extinction ratio of an optical transmitter using an interferogram wing-to-peak ratio - Systems and methods are described that derive a relationship between an optical transmitter's extinction ratio (E | 09-23-2010 |
| 20100247094 | DYNAMIC LOAD BALANCING OF FIBRE CHANNEL TRAFFIC - Systems and methods herein provide for load balancing Fibre Channel traffic. In this regard, a Fibre Channel load balancer may be operable to monitor Fibre Channel paths coupled to a host bus adapter and determine the speeds of the Fibre Channel ports within the Fibre Channel paths. The Fiber Channel load balancer may also be operable to determine certain characteristics of the Fibre Channel traffic being passed over the Fibre Channel paths. For example, a load balancer may determine Fibre Channel traffic sizes of pending requests and, based in part on the traffic sizes and operable normalized speeds of the Fibre Channel ports, adaptively route the pending original traffic across the Fibre Channel ports. | 09-30-2010 |
| 20100254702 | CLOCK RECOVERY WITH CHANNEL COEFFICIENTS - In a coherent optical receiver of an optical communications network, a method of recovering a clock signal from a high speed optical signal received through an optical link. A set of compensation vectors are adaptively computed for compensating Inter-symbol Interference (ISI) due to at least polarization impairments of the optical signal. A channel delay is estimated based on the computed compensation vectors. The estimated channel delay is subtracted from the computed compensation vectors to generate corresponding modified compensation vectors. Finally, the modified compensation vectors are used to derive a recovered clock signal. | 10-07-2010 |
| 20100272434 | Channel Validation In Optical Networks Using Multi-Channel Impairment Evaluation - In an optical communication network that includes a plurality of interconnected network nodes, a method includes storing in each network node one or more cross-talk margins of respective communication channels that traverse the node. A potential communication channel that traverses a subset of the nodes in the network is identified. A quality of the potential communication channel is evaluated by processing the cross-talk margins stored in the nodes in the subset. | 10-28-2010 |
| 20100272435 | Channel Validation In Optical Networks Using Multi-Channel Impairment Evaluation - In an optical communication network that includes a plurality of interconnected network nodes, a method includes storing in each network node, and for each communication channel that traverses the node, one or more impairment margins of respective impairments that affect the communication channel. A potential communication channel that traverses a subset of the nodes in the network is identified. A quality of the potential communication channel is evaluated by processing the impairment margins stored in the nodes in the subset. | 10-28-2010 |
| 20100272436 | OPTICAL PASSIVE NETWORK SYSTEM AND ITS OPERATION METHOD - In the configuration of an optical communication system interconnecting a parent station and a plurality of child stations via an optical fiber network equipped with an optical splitter, RE is provided having a measuring unit for measuring a transmission distance or time to a child station, a determining unit for determining a timing when a child station transmits a signal, in accordance with a transmission bandwidth request from the child station, and a signal processing unit for processing a signal received from a child station and transmitting the processed signal to the parent station. When a burst signal is received from each child station at the determined timing, a portion of the header of the burst signal is deleted, and a dummy signal is inserted into the deleted area and a gap area between received burst signals to convert the burst signals into a series of signals to be sent to the parent station. | 10-28-2010 |
| 20100278528 | Coherent optical receiver - A coherent optical receiver includes; a multiplexing section that multiplexes local oscillation light and received signal light, and outputs two pairs of lights with optical phases different to each other, a photoelectric converting section that executes differential photoelectric converting to convert the output lights from the multiplexing section into electric signals, an AD converting section that converts the respective electric signals output from the photoelectric converting section into digital signals, a digital signal processing section that compensates wavelength dispersion by subjecting the digital signals converted by the AD converting section to arithmetic processing using a digital filter, and then executes reception processing of data included in the received signal light, a monitoring section that monitors an intensity component in a predetermined band of the electric signals output from the photoelectric converting section, and a tap coefficient adjusting section that determines a tap coefficient of the digital filter according to a monitoring result obtained by the monitoring section. | 11-04-2010 |
| 20100278529 | THERMAL DRIFT COMPENSATION SYSTEM AND METHOD FOR OPTICAL NETWORKS - A method for correcting for optical channel bandwidth misalignment between output passbands of a first optical device and input passbands of a second optical device. The method may involve transmitting a plurality of optical signals from the output passbands of the first optical device, with each of the optical signals being transmitted within an associated one of the passbands of the output. The first plurality of optical signals may be received within the input passbands of the second optical device. The optical signals may be analyzed to determine if the passbands of the first optical device or the second optical device has shifted. A characteristic of a filter through which the optical signals pass may be altered to cause a needed degree of shifting of wavelength bands of the optical signals to bring the optical signals into alignment within the passbands of the second optical device. | 11-04-2010 |
| 20100284689 | Input signal detection device - According to an aspect of an embodiment, a signal detector device includes a first monitor unit, a second monitor unit, and a discriminator unit. | 11-11-2010 |
| 20100290779 | Method for estimating bandwidth limiting effects in high frequency transmission communication systems - A method for estimating a bandwidth limiting penalty of a chain of bandpass optical filters in an optical telecommunication system. The method is advantageous for systems carrying an optical signal at a bit rate of about 10 Gb/s, wherein average bandwidth of the filters in the chain is of the same order of magnitude as bandwidth of the optical signal. The method comprises selecting a worst case filter, checking the system by testing and/or simulating it as being provided with the selected worst case filter instead of the chain of filters, and then judging about the bandwidth limiting penalty of the chain of filters based on results of the checking. | 11-18-2010 |
| 20100303457 | SIGNAL QUALITY DETECTOR - In the signal quality detector ( | 12-02-2010 |
| 20100303458 | Optical Data Communications - A method of communicating data between a network device and a data network to which the device is connected via an optical fiber data link in which the device is connected to the optical fiber data link and the connection is monitored to detect data communication at a first standard. If data communication is detected at the first standard, data communication is established using the first standard. If not, the connection is monitored at the second standard. If data communication is detected at the second standard, data communication is established using the second standard. | 12-02-2010 |
| 20100303459 | DISPERSION COMPENSATING APPARATUS, DISPERSION COMPENSATING METHOD, OPTICAL RECEIVING APPARATUS, AND OPTICAL RECEIVING METHOD - A dispersion compensating apparatus includes a tunable dispersion compensator that dispersion-compensates an optical signal using a group delay property that is asymmetrical in bands outside an effective band; a set device that sets a dispersion compensation amount in the tunable dispersion compensator; and a shifter that shifts a central frequency of the effective band of the tunable dispersion compensator, based on the dispersion compensation amount set by the set device. | 12-02-2010 |
| 20100303460 | Encoder interpolator with enhanced precision - A method is presented for converting the sine/cosine signals from an optical encoder into a high-resolution position signal for use by a position control system while eliminating common noise and error sources. The improved noise performance resulting from the alias-free demodulation of encoder signals improves precision and reduces power consumption in precision motion control applications. The adaptive compensation of harmonic distortion eliminates errors related to offset, gain and quadrature of the encoder channels. The interpolator is able to process encoder signals at extremely high resolution without the speed limitation of prior art encoder interpolators. | 12-02-2010 |
| 20100316375 | Communicating with Components in Optical Communication Systems Using Voltage Signal Detection and Signature Analysis - Communication from a component in an optical communication system may be effected by modulating a system power voltage across the component to generate voltage signals representing the information to be communicated. The voltage signals generated by the component are detectable in the power feed equipment (PFE) in the optical communication system. Signature analysis may be performed on the system voltage data to identify the voltage signals and determine the information being communicated. | 12-16-2010 |
| 20100316376 | METHOD FOR PROCESSING BANDWIDTH, NETWORK DEVICE AND NETWORK SYSTEM - A method for processing bandwidth is disclosed to improve the bandwidth assignment accuracy. The method for processing bandwidth includes: obtaining the buffered data amount reported by an optical network unit (ONU) at this time and the previous time; determining difference between the buffered data amount reported at this time and the buffered data amount reported at the previous time; and assigning bandwidth according to the difference of the buffered data amount and previously assigned bandwidth. A network device and a network system are also provided. | 12-16-2010 |
| 20100329668 | Method and System for Optical Performance Monitoring in Ethernet Passive Optical Networks - One embodiment provides a system that tests optical performance in an Ethernet passive optical network (EPON), which includes an optical line terminal (OLT) and at least one optical network unit (ONU). The system configures an ONU with a circular queue that contains test frames for testing optical performance. The OLT then notifies the ONU to transmit test frames at a specified data rate for a specified duration. After receiving test frames at the OLT, the system measures frame loss and/or bit error rate based on the received test frames. | 12-30-2010 |
| 20110013906 | QUANTUM INFORMATION SYSTEM - According to one embodiment, a quantum information system includes a source of time dependent entangled photons and an indicating unit. The indicating unit indicates the entangled state of the entangled photons based on the emission time of one or more of the entangled photons. | 01-20-2011 |
| 20110033181 | APPARATUS FOR VISIBLE LIGHT COMMUNICATION PROVIDING INTUITIVE INFORMATION AND METHOD USING THE SAME - There is disclosed a visible light communication technology capable of intuitively recognizing a transmission speed, an alignment state, a communication state, or a transmission rate. A visible light communication apparatus according to an embodiment of the present invention includes: a light source selecting unit selecting at least one light source from among a plurality of light sources generating lights having different wavelengths by considering intuitive information distinguished depending on a wavelength in a visible light band; and a visible light communication unit performing visible light communication by at least one selected light source to allow the intuitive information to be recognized by a color corresponding to at least one selected light source. Accordingly, a user using the visible light communication can intuitively know an optimal communication state or transmission speed. | 02-10-2011 |
| 20110052187 | TIME DIVISION MULTIPLEXED DETECTOR FOR A MAGNETO-OPTICAL CURRENT TRANSDUCER - A system monitors alternating current and includes a magneto-optical current transducer (MOCT) adapted to modulate an optical signal corresponding to magnitude of the alternating current. Beam splitters are in communication with the MOCT which are in turn connected to respective channels. Each channel includes an LED that is powered by a constant current source. | 03-03-2011 |
| 20110085794 | Wavelength Locker for Simultaneous Control of Multiple Dense Wavelength Division Multiplexing Transmitters - An apparatus comprising a plurality of optical transmitters coupled to a fiber, a signal generator coupled to the optical transmitters and configured to provide a single pilot tone to the optical transmitters, and a processor positioned within a feedback loop between the fiber and the optical transmitters, the processor configured to adjust a wavelength for each of the optical transmitters to lock the wavelengths. An apparatus comprising at least one processor configured to implement a method comprising receiving an optical signal comprising a pilot tone, detecting an amplitude and a phase of the pilot tone, calculating a quadrature term using the amplitude and the phase, and wavelength locking the optical signal using the quadrature term. | 04-14-2011 |
| 20110085795 | COMMUNICATION DEVICE AND DOWNSTREAM RESOURCE ALLOCATION METHOD - A communication device which communicates with a plurality of subscriber communication devices using optical signals of a plurality of wavelengths, includes: a traffic monitoring section for monitoring a downstream traffic volume of a downstream signal destined for each of the plurality of subscriber communication devices; and a resource allocating section for allocating a different one of a predetermined number of wavelength resources to each of groups which includes at least one downstream signal grouped according to a predetermined wavelength allocation rule based on its downstream traffic volume. | 04-14-2011 |
| 20110085796 | OPTICAL COMMUNICATION MODULE AND CONTROL METHOD FOR OPTICAL COMMUNICATION MODULE - An optical communication module includes a laser that emits laser light, and an electro-absorber that absorbs the laser light, which is emitted from the laser, according to a voltage modulated based on a modulating signal and a bias voltage. The optical communication module detects data that varies correlatively with the temperature of the electro-absorber, and sets the bias voltage, which is associated with the detected data, on the basis of relational data specifying at least the relationship between the bias voltage and the data. | 04-14-2011 |
| 20110091204 | METHOD AND SYSTEM FOR DEPLOYING AN OPTICAL DEMODULATOR ARRANGEMENT IN A COMMUNICATIONS NETWORK - The present application describes methods and systems for use in a communications network. More specifically, a method of deploying an optical demodulator arrangement having at least one interferometer in a network that transmits an optical signal is provided. The optical signal may include one or more on-off-keyed signals and one or more DMPSK signals. In some embodiments, the DMPSK signal is a DQPSK signal. The network may include one or more of fiber spans carrying the signals. The interferometer may have a first optical path and a second optical path and a time delay is formed between the first and second optical paths. The method may involve determining a cross-talk penalty that results from cross-phase modulation between the channels, and determining a time delay value for the interferometer. The time delay value may be determined based at least in part on determined the cross-talk penalty. | 04-21-2011 |
| 20110091205 | MULTI-INTERFACE PROTOCOL ANALYSIS SYSTEM - A device may include a first module to capture information relating to network traffic passing through a first interface in a network device. A second module may capture information relating to network traffic passing through a second interface in the network device. A control module may be configured to transmit control commands to the first module and the second module, the control commands instructing the first module and the second module to capture information relating to network traffic passing through the first interface and the second interface, respectively. The control module may be further configured to receive the captured information from the first module and the second module, correlate the received information from the first module and the second module; and provide the correlated information to a user. | 04-21-2011 |
| 20110097078 | MEASURING PHASE NOISE IN RADIO FREQUENCY, MICROWAVE OR MILLIMETER SIGNALS BASED ON PHOTONIC DELAY - Techniques and devices for measuring phase noise in radio frequency (RF), microwave, or millimeter signals based on photonic delay. | 04-28-2011 |
| 20110097079 | OPTICAL COMMUNICATION SYSTEM, OPTICAL TRANSMITTER, OPTICAL RECEIVER AND METHODS, AND CORRELATORS USED THEREFOR - A complex orthogonal code in the present invention is one in which each row of a square matrix of N rows and N columns in which an element of an mth row and nth column is exp[2πj(m−1)(n−1)/N] (where j is an imaginary unit) is adopted as a code word. An optical orthogonal code for Optical Code Division Multiplexing/Optical Code Division Multiple Access (OCDM/OCDMA) is realized by a train of N-number of optical pulses corresponding to the argument (phase) of the code elements. An optical transmitter or optical receiver includes an optical correlator provided with a sampled Bragg grating having a plurality of Bragg gratings disposed serially at regular intervals inside an optical waveguide. The optical correlator is allocated any one of the code words. In the optical transmitter, an optical signal to be transmitted is encoded by the optical correlator. In the receiver, a received optical signal is decoded by the optical correlator. A high autocorrelation output is obtained only in a case where the code word used to encode the received optical signal and the code word allocated to the optical receiver match. | 04-28-2011 |
| 20110123190 | Connection Loss Scheme for Fiber Connections in Optical Communication System - A method includes outputting an optical signal from an optical transmitter; causing the optical signal to propagate through equipment of an optical communication site and to loop back to an optical receiver; measuring optical powers, respectively, based on taps proximate to the optical transmitter and the optical receiver; calculating an optical power loss based on the optical powers measured; determining whether the optical power loss is an acceptable value; and indicating when the optical power loss is not the acceptable value. | 05-26-2011 |
| 20110135299 | DIFFERENTIAL EYE DIAGRAMS - Changes in a signal are detected. The signal is repeatedly sampled in a synchronous manner during a predetermined interval to generate a captured eye diagram. At least one of a positive differential eye diagram or a negative differential eye diagram is generated from the captured eye diagram and a baseline eye diagram. The at least one positive or negative differential eye diagram is analyzed to determine whether a change in signal conditions is present. | 06-09-2011 |
| 20110135300 | RADIO BASE STATION EQUIPMENT, RADIO COMMUNICATION SYSTEM AND DELAY CORRECTION METHOD - Radio base station equipment is connected to radio transmitting/receiving equipment provided in sectors (S), into which a communication area is divided, by an optical fiber ( | 06-09-2011 |
| 20110142441 | OPTICAL FIBER CONNECTOR AND NETWORK DEVICE CONFIGURATION - A fiber-optic coupler may include a first optical fiber including an end portion to send or receive optical signals to or from an end portion of a second optical fiber. The coupler may also include a micro-electromechanical systems (MEMS) structure to align the end portion of the first optical fiber with the end portion of the second optical fiber. | 06-16-2011 |
| 20110142442 | DYNAMIC MANAGEMENT OF POLLING RATES IN AN ETHERNET PASSIVE OPTICAL NETWORK (EPON) - A system in an Optical Line Terminal (OLT) to dynamically manage polling rates in a passive optical network is provided herein. The system includes a Media Access Control (MAC) unit that is configured to receive a first message from an Optical Network Unit (ONU). The first message includes a status of an upstream queue of the ONU. The system includes a traffic monitor unit coupled to the MAC unit and is configured to receive the first message from the MAC unit and place the upstream queue of the ONU in an inactive mode if the status of the upstream queue indicates that the upstream queue is empty. | 06-16-2011 |
| 20110142443 | BURST MODE TO CONTINUOUS MODE CONVERTER - A system to convert upstream burst mode data into continuous mode data in a passive optical network (PON) is provided herein. The system includes a burst mode Serializer/Deserializer (SerDes) that recovers a clock and burst mode data from an Optical Network Unit (ONU). The burst mode unit recovers the burst mode data based on a start time of burst mode data transmission by the ONU and a round-trip time between the ONU and an Optical Line Terminal (OLT). The system further includes a continuous mode SerDes that is coupled to the burst mode SerDes. The continuous mode SerDes is configured to receive the recovered clock and recovered burst mode data from the burst mode SerDes and convert the burst mode data into continuous mode data by buffering and padding the burst mode data based on the recovered clock. The continuous mode Serdes is configured to transmit the continuous mode data to the OLT. | 06-16-2011 |
| 20110142444 | TWO AND THREE-STROKE DISCOVERY PROCESS FOR 10G-EPONS - The invention relates to a method to discover Optical Network Units (ONU) with different speed capabilities in an Ethernet Passive Optical Network (EPON) by an Optical Line Termination (OLT), where logical links in the network are identified by Logical Link IDs, and the OLT can transmit and receive data with 1 Gbit/s-speed (1 G) and 10 Gbit/s-speed (10 G), and the discovery process is handled in the OLT by a Multi Point Control Process (MPCP), which exchanges messages as Data Units (MPCPDU) with the ONUs. This is achieved by extending the standard MPCPDUs in a way, that backward compatability is assured. | 06-16-2011 |
| 20110150463 | METHOD AND APPARATUS FOR MULTI-SERVICE ADAPTATION AND CARRIAGE - A method and an apparatus for multi-service adaptation and carriage, comprising: mapping at the service adaptation layer different types of services into uniform enhanced Gigabit Passive Optical Network Encapsulation Method (E-GEM) frames; combining at the channel layer E-GEM frames encapsulating the same type of services into the same type of T-CONT frames; setting a priority for each type of T-CONT; guaranteeing bandwidth for T-CONT frames with high priority and preferentially sending it. | 06-23-2011 |
| 20110158639 | METHODS AND APPARATUSES TO SUPPORT MULTIPLE FIBER NETWORKING PLATFORMS - Methods and apparatuses to support multiple access platforms on a network device are described. One or more first signals are sensed. First synchronization data associated with the one or more first signals are determined. A first networking protocol can be determined based on the first synchronization data. The first networking protocol can be determined before transmission is enabled at the network device. A first mode associated with the first networking protocol can be enabled. The one or more first signals are sensed at a first rate. One or more second signals are sensed at a second rate. A second networking protocol can be determined based on the one or more second signals. A second mode associated with the second networking protocol can be enabled. | 06-30-2011 |
| 20110158640 | Chirp measuring device and chirp measurement method - A chirp measuring device includes a chirp measuring unit that measures chirps indicating a time variation of an optical frequency of input light signal; a signal averaging unit that computes, based on a predetermined number of additions for signal averaging, an average of the chirps measured by the chirp measuring unit; a chirp threshold value determining unit that determines whether the average computed by the signal averaging unit is not less than a predetermined chirp threshold value; and a determination result output unit that outputs a determination result obtained by the chirp threshold value determining unit. | 06-30-2011 |
| 20110158641 | Subchannel Photonic Routing, Switching and Protection with Simplified Upgrades of WDM Optical Networks - The present invention includes novel techniques, apparatus, and systems for optical WDM communications. Tunable lasers are employed to generate respective subcarrier frequencies which represent subchannels of an ITU channel to which client signals can be mapped. In one embodiment, subchannels are polarization interleaved to reduce crosstalk. In another embodiment, polarization multiplexing is used to increase the spectral density. Client circuits can be divided and combined with one another before being mapped, independent of one another, to individual subchannels within and across ITU channels. A crosspoint switch can be used to control the client to subchannel mapping, thereby enabling subchannel protection switching and hitless wavelength switching. Network architectures and subchannel transponders, muxponders and crossponders are disclosed, and techniques are employed (at the subchannel level/layer), to facilitate the desired optical routing, switching, concatenation and protection of the client circuits mapped to these subchannels across the nodes of a WDM network. | 06-30-2011 |
| 20110158642 | Management, Monitoring and Performance Optimization of Optical Networks - The present invention includes novel techniques, apparatus, and systems for optical WDM communications. Tunable lasers are employed to generate respective subcarrier frequencies which represent subchannels of an ITU channel to which client signals can be mapped. In one embodiment, subchannels are polarization interleaved to reduce crosstalk. In another embodiment, polarization multiplexing is used to increase the spectral density. Client circuits can be divided and combined with one another before being mapped, independent of one another, to individual subchannels within and across ITU channels. A crosspoint switch can be used to control the client to subchannel mapping, thereby enabling subchannel protection switching and hitless wavelength switching. Network architectures and subchannel transponders, muxponders and crossponders are disclosed, and techniques are employed (at the subchannel level/layer), to facilitate the desired optical routing, switching, concatenation and protection of the client circuits mapped to these subchannels across the nodes of a WDM network. | 06-30-2011 |
| 20110170859 | OPTICAL NETWORK REAL TIME LATENCY MEASUREMENT SYSTEMS AND METHODS - The present disclosure provides systems and methods for real-time, in-service latency measurements over optical links that may be further integrated within various optical control planes. The present invention may utilize minimal unused overhead to calculate latency of an optical line through a transport network. The present invention utilizes timers at two end-point nodes associated with the optical line, and includes a mechanism to filter out frame skew between the nodes. Advantageously, the present invention provides a highly accurate latency measurement that may calculate latency on links as small as one meter, an in-service algorithm operable without network impact, and may be integrated with an optical control plane to automatically provide administrative weight variables associated with link costs. | 07-14-2011 |
| 20110170860 | SYSTEMS AND METHODS OF MEASURING LATENCY AND ROUTING THEREON IN OPTICAL NETWORKS - The present disclosure provides systems and methods for making latency measurements and using these measurements in routing in optical networks. In an exemplary embodiment, a method is defined whereby two nodes sharing a line automatically determine whether both nodes are capable of making a latency measurement and then which node will initiate and which node participates in making the latency measurement. In another exemplary embodiment, an on-demand latency measurement may be made between any two arbitrary nodes within a domain. Routing messages may be used to disseminate the latency of links via a signaling and routing protocol. Advantageously, the present invention provides measurement of latency and latency variation of customer circuits (i.e., SNCs) using an in-band, non-intrusive calculation with a high-degree of accuracy. Furthermore, the present invention may consider these calculations for circuit routing based on the latency and circuit acceptance based on maximum latency restrictions. | 07-14-2011 |
| 20110170861 | METHOD AND DEVICE FOR ADJUSTING TRANSMISSION OF TRANSPORT NETWORK DATA - In the field of optical communications, a method and a device for adjusting transmission of transport network data are provided. The method includes the following steps. Information of adjusting a designated Optical Transport Network (OTN) line sent from an OTN is received. The OTN line corresponding to the information of adjusting the designated OTN line is adjusted. Changed data traffic of the adjusted OTN line is calculated. An Ethernet channel to be adjusted according to the changed data traffic is designated, and the Ethernet channel to be adjusted is adjusted correspondingly. The device includes a Link Capacity Adjustment Scheme (LCAS) module and a channel processing module. According to the method and the device, the adjustment of the OTN line is associated with the adjustment of the Ethernet channel, thereby ensuring the data transmission efficiency, and improving the overall performance of a network. | 07-14-2011 |
| 20110182572 | GENERATION OF A FEEDBACK SIGNAL FOR A POLARIZATION MODE DISPERSION COMPENSATOR IN A COMMUNICATION SYSTEM USING ALTERNATE-POLARIZATION - The invention relates to a method of generating a feedback signal for adjusting a polarization mode dispersion compensator (PMDC, | 07-28-2011 |
| 20110182573 | All-Optical Balanced Detection System - A two-gate sampling system has been designed to perform sampled balanced detection of one or more input signal pairs. The present invention performs simultaneous sampling of both signals in each signal pair followed by digitization and combination of the sample pairs using software. By first sampling the signals and then combining the sampled into the corresponding balanced detected signal it is possible to avoid the bandwidth limitations and impedance problems introduced by traditional balanced detectors and electrical oscilloscopes. In particular, for optical sampling gates very high bandwidth sampling gates can be designed without any impedance issues and hence almost perfect balanced detection reconstruction can be performed for very high speed signals. Balanced detection is becoming more and more important as the new phase modulated optical data signals are introduced to the market, such as e.g. PSK, DPSK, QPSK and DQPSK. The present invention is well suited for analysis of these new types of signals. | 07-28-2011 |
| 20110188849 | SYSTEM FOR REDUNDANCY IN ETHERNET PASSIVE OPTICAL NETWORKS (EPONS) - A system for redundancy in Ethernet passive optical networks (EPONs) facilitates fast recovery from failure (less than 50 msec), path redundancy of the fiber optic network, and location redundancy of the OLTs. An optical networking unit (ONU) in a normal state monitors input communications, and when the input communications are quiet for a predetermined minimum length of time, the ONU transitions to a lenient state in which: the ONU accepts old and new security keys; upon receiving a packet: the ONU updates an ONU timestamp based on the packet's timestamp; and the ONU transitions to the normal state of operation. While the ONU is in the lenient state if a packet is not received for a predetermined given length of time the ONU transitions to a deregistered state. In this system, main and standby OLTs do not require synchronization of security parameters or synchronization for differences in fiber lengths. | 08-04-2011 |
| 20110188850 | INTERFEROMETER, DEMODULATOR, AND OPTICAL COMMUNICATION MODULE - When designing a demodulator for a DPSK-modulated signal, it is required that optical phase modulation is performed fast and the demodulator has a long lifetime. To achieve this object, a delay line interferometer inside the demodulator performs adjustment of phase difference between two split lights caused to interfere, using a first optical phase modulation unit such as a Piezo actuator and a second optical phase modulation unit such as a heating element that operates slower in modulation speed than the first optical phase modulation unit and is slower in deterioration speed. | 08-04-2011 |
| 20110200325 | Dynamic Cell Bonding (DCB) for Radio-over-Fiber (RoF)-Based Networks and Communication Systems and Related Methods - Communication devices, systems, and methods for dynamic cell bonding (DCB) for Radio-over-Fiber (RoF)-based networks and communication systems are disclosed. In one embodiment, a method of operating an optical fiber-based wireless communication system is provided. The method includes determining a first plurality of remote units in a cloud bonded to a Radio-over-Fiber (RoF) communication session. The method also includes measuring a received signal strength from each of the first plurality of remote units. The method also includes measuring a received signal strength from each of a second plurality of remote units in the cloud not bonded to the RoF communication session. At least one of the second plurality of remote units is dynamically bonded to the RoF communication session if the measured received signal strength of the one of the second plurality of remote units is greater than the measured received signal strength of the first plurality of remote units. | 08-18-2011 |
| 20110200326 | PASSIVE OPTICAL NETWORK SYSTEM AND RANGING METHOD - In a WDM-PON system wherein a plurality of ONUs transfer signals by sharing wavelengths, one wavelength dedicated to a ranging procedure is set, and the ranging is performed with only the dedicated wavelength, so as to measure reciprocating delay times. At the other wavelengths, transmission signals from a plurality of ONUs are transferred in time division multiplexing based on the obtained reciprocating delay times. An OLT includes a burst receiver circuit for only the wavelength dedicated to the ranging, and subsequently to the ranging, the OLT adjusts transmission amplitudes and transmission phases for the ONUs, so as to equalize received amplitudes and received phases in the OLT. For this purpose, the OLT includes means for measuring the amplitudes and phases of received signals, as the burst receiver circuit, and it includes a table for managing the received amplitudes and received phases of the respective ONUs. | 08-18-2011 |
| 20110206368 | Optical Network Computation Engine - An apparatus for computing optical network characteristics may comprise: a plurality of network elements arranged into two or more domains; two or more optical computation engines, each of the two or more optical computation engine associated with a respective one of the two or more domains; and a centralized path computation engine configured to interface with the two or more optical computation engines to calculate one or more characteristics of the optical path. Each of the two or more domains may comprise one or more network elements sharing a common operational characteristic. The plurality of network elements may be in optical communication along an optical path, the optical path including a first network element at an origin of the optical path and a final network element at a terminus of the optical path. The two or more optical computation engines may be configured to perform calculations related to the optical performance of the network elements associated with the same domain as the optical computation engine. | 08-25-2011 |
| 20110206369 | FIBER OPTIC SECURITY SYSTEMS AND METHODS OF USING THE SAME - A fiber optic security system is provided. The fiber optic security system includes at least one length of fiber optic cable affixed to at least one item to be monitored using the fiber optic security system. The fiber optic security system also includes at least one local control node, the at least one local control node including at least one light source for generating and transmitting light through the at least one length of fiber optic cable, and the at least one local control node monitoring a status of the light. The fiber optic security system also includes a remote control unit for receiving information from the at least one local control node regarding the status of the light. | 08-25-2011 |
| 20110206370 | Low-Energy Optical Network Architecture - A method and apparatus for controlling traffic in an optical network having a plurality of OLTs for communicating with a plurality of PONs. A traffic controller receives traffic information concerning current traffic volume and, preferably with reference to a rules database, calculates the number of OLTs required to support the current traffic volume. A separate determination may be made whether a network reconfiguration is permitted at this time. If a reconfiguration is permitted, the traffic controller configures a traffic control switch to route the PON traffic to an from only the calculated number of OLTs. The traffic control switch may be implemented using a voltage-controlled optical fiber coupling or electronically, routing the traffic as electrical signals to and from electro-optical converters associated with each PON. The OLTs to be used may be selected by the traffic controller. The method and apparatus may also be used for fault management to route PON traffic through operational components when a failure of other components in the network is detected. | 08-25-2011 |
| 20110211826 | System and Method for Managing the Selection of Ghost Channels for Mitigating Polarization Hole Burning - A system and method for selecting ghost channels in an optical communication system, including components configured to examine an optical communication channel within a node of the optical communication system, examine a neighbor channel of the optical communication channel, determine whether using the neighbor channel as a ghost channel will create an undesirable level of risk of feedback within the optical communication system, if using the neighbor channel as a ghost channel will not create an undesirable level of risk of feedback, determine whether the neighbor channel is currently used as a ghost channel, and if the neighbor channel is not currently used as a ghost channel, select the neighbor channel as a ghost channel. | 09-01-2011 |
| 20110211827 | SYSTEM AND METHOD FOR PERFORMING IN-SERVICE OPTICAL FIBER NETWORK CERTIFICATION - A system and method for performing an in-service optical time domain reflectometry test, an in-service insertion loss test, and an in-service optical frequency domain reflectometry test using a same wavelength as the network communications for point-to-point or point-to-multipoint optical fiber networks while maintaining continuity of network communications are disclosed. | 09-01-2011 |
| 20110211828 | Flexible Dispersion Mapping - One method configures an all-optical network such that at least eighty percent of optical fiber spans of a portion of a first all-optical path of the network have substantially a first residual dispersion per span and at least eighty percent of optical fiber spans of a remainder of the first all-optical path have residual dispersions per span substantially differing from the first residual dispersion per span. The remainder of the first all-optical path includes an overlap between the first all-optical path and a second all-optical path of the network. The second all-optical path has a plurality of optical fiber spans and a substantially singly periodic dispersion map. | 09-01-2011 |
| 20110222848 | Method and Apparatus for Fault-Tolerant Quantum Communication Based on Solid-State Photon Emitters - A novel method and apparatus for long distance quantum communication in realistic, lossy photonic channels is disclosed. The method uses single emitters of light as intermediate nodes in the channel. One electronic spin and one nuclear spin coupled via the contact hyperfine interaction in each emitter, provide quantum memory and enable active error purification. It is shown that the fixed, minimal physical resources associated with these two degrees of freedom suffice to correct arbitrary errors, making our protocol robust to all realistic sources of decoherence. The method is particularly well suited for implementation using recently-developed solid-state nano-photonic devices. | 09-15-2011 |
| 20110222849 | OPTICAL TRANSMISSION APPARATUS FOR VISIBLE LIGHT COMMUNICATION - Disclosed herein is an optical transmission apparatus for visible light communication. The optical transmission apparatus includes a power conversion unit, a drive unit, an encoding unit, a control unit, and a detection unit. The power conversion unit provides Direct Current (DC) power to the lighting LED lamps. The drive unit is operated using a switching drive method and supplies operating current to the lighting LED lamps. The encoding unit is connected to an external network, receives and encodes data, and provides it to the drive unit. The control unit controls the operation of the power conversion unit, the drive unit, and the encoding unit. The detection unit measures the strength of a visible light signal sent by the lighting LED lamps. | 09-15-2011 |
| 20110229126 | Automatic Adjustment of Optical Bandwidth Based on Client Layer Needs - At a cross-connect device coupled to a router, utilization of a logical interface of the router is monitored using generally available mechanisms on the router without requiring purpose-built mechanisms. Capacity of interface resources to the logical interface used at the router is adjusted depending on the utilization. | 09-22-2011 |
| 20110229127 | DIGITAL COHERENT RECEIVER AND DIGITAL COHERENT RECEPTION METHOD - A digital coherent receiver converts signals and local light respectively detected, as detection results, in signal light from an optical transmission line, into digital signals and that further applies digital processing to the digital signals. The receiver includes a skew detecting unit that detects skew between the digital signals; a skew control unit controls the skew of each of the signals so that the skew to be detected by the skew detecting unit will be reduced; and a demodulating unit that demodulates each signal controlled for skew by the skew control unit. | 09-22-2011 |
| 20110243553 | METHOD, COMPUTER PROGRAM, AND ALGORITHM FOR COMPUTING NETWORK SERVICE VALUE PRICING BASED ON COMMUNICATION SERVICE EXPERIENCES DELIVERED TO CONSUMERS AND MERCHANTS OVER A SMART MULTI-SERVICES (SMS) COMMUNICATION NETWORK - A system and method for providing multi-services within a communication network according to various exemplary embodiments can include storing, in a database of a computer, user-defined sets of rules and instructions for providing multi-services to end user devices connected to a communication network comprising a Hybrid Fiber-Wireless (HFW) network having policy management capabilities. The system and method can receive, at one or more processors, the user-defined sets of rules and instructions from a plurality of end users via a plurality of end user devices. The system and method can configure a virtual network for each end user within the communication network using the policy management capabilities based on the user-defined sets of rules and instructions provided by each end user. The user-defined sets of rules and instructions define provisioning and delivery of resources and services provided by the communication network to the end user. | 10-06-2011 |
| 20110249967 | Method and System for Adaptively Setting a Transmitter Filter for a High Speed Serial Link Transmitter - A communication device may be operable to determine, in an optical module, a signal quality associated with each of one or more host transmitter filters in a host circuit. The signal quality may be communicated from the optical module to the host circuit via a management interface. The communication device may control, in the host circuit, configuration of each of the host transmitter filters based on the signal quality. The communication device may be operable to determine, in the host circuit, a signal quality associated with each of one or more module transmitter filters in the optical module. The signal quality associated with each of the module transmitter filters may be communicated from the host circuit to the optical module via the management interface. The communication device may control, in the optical module, configuration of each of the module transmitter filters based on the signal quality. | 10-13-2011 |
| 20110249968 | Fast Transceiver Control Interface - An apparatus comprising an optical transceiver module. The apparatus also includes an interface coupled to the optical transceiver and comprising a plurality of pins. The interface is configured to communicate a burst data word at a data rate of about one data word within about a shortest burst time based on multiplexing one of a plurality of control and/or monitoring signals onto one of the plurality of pins | 10-13-2011 |
| 20110255862 | OPTICAL NETWORK UNIT (ONU) HAVING CONTROLLABLE OPTICAL OUTPUT AND METHOD OF CONTROLLING THE OPTICAL OUTPUT OF AN ONU - An optical network unit (ONU) includes an optical interface, a detector producing an output signal based on a characteristic of an optical input received via the optical interface, a radio-frequency (RF) interface, an opto-electrical (O/E) converter in a first path from the optical interface to the RF interface, an electro-optical (E/O) converter in a second path from RF interface to the optical interface and a controller operatively connected to the detector, the controller being configured to adjust an optical output of the ONU based on the characteristic, where the characteristic may be a level of the received signal. Also a method of adjusting an optical output of an ONU based on a characteristic of a received signal. | 10-20-2011 |
| 20110255863 | INTEGRAL TRANSFORMED OPTICAL MEASUREMENT METHOD AND APPARATUS - An optical measurement method for high-speed acquisition of integral transformed time domain optical signals is presented. A circuit network is used to generate a modulation signal and a reference signal from a broadband signal such as a pseudo random bit sequence. The integral transformed measurements are obtained by cross correlating the time dependent response to the modulated illumination with the reference signal. | 10-20-2011 |
| 20110255864 | CARRIER FREQUENCY OFFSET (CFO) ESTIMATOR WITH LOW COMPLEXITY AND HIGH ACCURACY FOR ORTHOGONAL-FREQUENCY-DIVISION-MULTIPLEXING (CO-OFDM) SYSTEMS - A system and method are provided for carrier frequency offset (CFO) estimation for coherent optical orthogonal-frequency-division-multiplexing (CO-OFDM) broadband systems. The method includes obtaining an initial estimate of a normalized CFO with an estimation range equal to ±L/2 subcarrier subspacing using a single training symbol with L identical portions. The method further includes obtaining a maximum likelihood (ML) estimate of the CFO by performing a local grid search based on the initial estimate. | 10-20-2011 |
| 20110280569 | Integrated Circuit With Optical Interconnect - The present invention provides one or more embodiments of an optical interconnect design suitable for providing communication between computer system components in a computer system device. The optical interconnect ( | 11-17-2011 |
| 20110293266 | OPTICAL TRANSMITTING DEVICE AND OPTICAL RECEIVING DEVICE - There is provided an optical transmitting device including a detector to detect a transmission rate of a transmission signal, a transmission method selector to determine a transmission method of the transmission signal, based on the transmission rate detected by the detector, a modulation signal generator circuit to generate a modulation signal from the transmission signal, based on the transmission method determined by the transmission method selector, and an optical modulator to generate a modulated optical signal from the modulation signal generated by the modulation signal generator circuit. | 12-01-2011 |
| 20110293267 | METHOD AND APPARATUS FOR TESTING TRANSMISSION LINES NORMALLY PROPAGATING OPTICAL SIGNALS - Portable apparatus for measuring parameters of optical signals propagating concurrently in opposite directions in an optical transmission path between two elements, at least one of the elements being operative to transmit a first optical signal (S | 12-01-2011 |
| 20110305451 | COMMUNICATION DEVICE, COMMUNICATION SYSTEM, AND METHOD OF ALLOCATING BANDWIDTH - A communication device operating as a master unit includes: a MAC layer termination functioning unit for extracting, from a receiving signal, queue length information scheduled to be transmitted from an ONU, and controlling transmission of a grant to the ONU; a traffic monitor for measuring an amount of uplink traffic of each ONU; and a bandwidth allocation functioning unit for determining a bandwidth to be allocated to each ONU based on the queue length information extracted by the MAC layer termination functioning unit, the amount of traffic measured by the traffic monitor, and a bandwidth that can be allocated in one cycle of bandwidth update, and issuing a grant according to the determination. The bandwidth allocation functioning unit updates a bandwidth to be allocated periodically. | 12-15-2011 |
| 20110311221 | MASTER STATION UNIT AND METHOD OF ALLOCATING GRANT - In a PON system including a high-speed optical signal of a high transmission speed and a low-speed optical signal the speed of which is lower than that of the high-speed optical signal, the PON system employing TDMA system for upward signal transmission, an OLT controls transmission and reception of the low-speed optical signal and the high-speed optical signal and allocates a grant to a slave station unit connected to the OLT. The OLT includes: a traffic monitoring part for measuring the amount of traffic of data received from a high-speed ONU that is a slave station unit that makes communications using the high-speed optical signal; and a bandwidth allocating part for allocating a grant to a low-speed ONU on the basis of report information acquired from the low-speed ONU that is a slave station unit that makes communications using the low-speed optical signal, the bandwidth allocating part allocating a grant to the high-speed ONU on the basis of report information acquired from the high-speed ONU, a grant allocated in a previous cycle, and a result of measurement of the amount of traffic in the previous cycle acquired from the traffic monitoring part. | 12-22-2011 |
| 20110317998 | DELAY AMOUNT ALLOCATION MEANS, DELAY AMOUNT ALLOCATION METHOD AND A COMPUTER READABLE RECORDING MEDIUM WHICH RECORDS CONTROL PROGRAM OF DELAY AMOUNT ALLOCATION MEANS - In order to calculate an appropriate delay amount of a communication apparatus, delay amount allocating means is provided with round-trip time measurement means which measures a round-trip time which is a difference between a transmission time when a first communication apparatus sends a predetermined signal to each of second communication apparatuses and a reception time when a first communication apparatus receives a response to the predetermined signal, round-trip time comparison means which determines whether a difference between a round-trip time at the present time and a round-trip time in the past time falls within a predetermined range on each of the second communication apparatuses, and a delay amount calculation means which selects a representative value from numerical values between a maximum value and a minimum value of the differences and outputs as a delay amount which is a sum of the representative value and a predetermined value in the case that each of the differences falls within the predetermined range. | 12-29-2011 |
| 20120002960 | OPTICAL MEASUREMENT INSTRUMENT WITH DATA TRANSMISSION - An optical measurement instrument comprises operational modules ( | 01-05-2012 |
| 20120014690 | METHOD TO DEFINE SHARED RISK LINK GROUPS IN OPTICAL TRANSPORT SYSTEMS - A method defines shared risk link groups in optical transport systems, in which two optical links sharing at least one single point of failure are considered to be non-disjoint. For each optical link there is measured and recorded a polarization state characteristic and two links having the same characteristic are judged to be non-disjoint and to be in the same shared risk link group. | 01-19-2012 |
| 20120014691 | CALIBRATING AN OPTICAL DOWNCONVERTER - An apparatus calibrates an optical downconverter configured to receive an optical input signal at a signal input and an optical reference signal at a reference input, and to provide at multiple output nodes characterizing signals for characterizing the optical input signal. The downconverter includes receivers having corresponding optical inputs and respectively providing the characterizing signals at the output nodes, and multiple optical signal paths connected between one of the signal and reference inputs and one of the optical inputs. The apparatus includes a signal analyzing unit coupled to the output nodes and configured to receive and analyze the characterizing signals, a first switch for selectively enabling the optical input signal, and a second switch for selectively enabling the reference signal. The signal analyzing unit is configured to derive correction values based on determined signals at the output nodes derived from selectively enabling at least one of the optical input signal and the reference signal, and to correct the characterizing signals with the derived correction values. | 01-19-2012 |
| 20120020660 | METHOD OF AND SYSTEM FOR DETECTING SKEW BETWEEN PARALLEL SIGNALS - A method is provided for detecting the skew between parallel light signals generated from a serial data stream. The method can be used with polarization multiplexed signal, as well as with wavelength division multiplexed signals, spatial division multiplexed signals, phase modulated signals, or intensity modulated signals. The method can be used with direct detection schemes as well as with coherent detection schemes. The method is provided with: imprinting dips between a fixed number of transmitted symbols of the parallel signals; detecting an electrical signal related to the dips for each parallel signal; and comparing the electrical signals in delay. | 01-26-2012 |
| 20120027403 | COMMUNICATION CLOCK TRANSPORT METHOD AND DEVICE - A method and apparatus for timing an output signal based on timing of an input signal is provided. A method includes determining a first clock rate derived from the input signal during a first time interval measured by a reference clock. The method also includes signal processing logic to determine a second clock rate during a second time interval based on an error signal that is calculated as a difference between the first clock rate multiplied by the second time interval and a previous value of the second clock rate multiplied by the first time interval. | 02-02-2012 |
| 20120027404 | PHASE NOISE COMPENSATION IN COHERENT OPTICAL COMMUNICATIONS SYSTEMS | 02-02-2012 |
| 20120027405 | METHOD AND APPARATUS FOR SYNCHRONIZING TIME IN A PASSIVE OPTICAL NETWORK - A method and apparatus for synchronizing time in a Gigabit Passive Optical Network (GPON) in which an Optical Line Terminal (OLT) sends a downstream frame including a Physical Control Block downstream (PCBd) field and a payload field to an Optical Network Unit (ONU); the OLT determines a time value associated with a certain bit in the PCBd field of the downstream frame; and the OLT sends an Operation, Administration and Maintenance (OAM) message defined by a GPON protocol carrying the time value to the ONU, wherein the ONU uses the time value to adjust a local time of the ONU. | 02-02-2012 |
| 20120033964 | METHOD AND APPARATUS FOR CONTROL OF DPSK AND DQPSK RECEIVERS AND TRANSMITTERS - An optical communication device such as a transmitter or receiver has a control loop for controlling relative phase of two related optical signals based on signal peak intensity. An optical transmitter measures the signal peak intensity of a combined optical signal representing two data channels to adjust relative phase as desired. An optical receiver measures the signal peak intensity of combined electrical signals, single electrical signals or single optical signals to adjust relative phase as desired. Signal peak intensity is minimized or maximized by adjusting the relative phase, depending upon the modulation configuration used. The feedback control provides a consistent and robust control to stabilize the optical communication device in the presence of variables such as temperature changes, aging and manufacturing tolerances. | 02-09-2012 |
| 20120039599 | METHOD AND SYSTEM FOR TRACKING TWO COMMUNICATIONS PARTICIPANTS OF AN OPTICAL SATELLITE COMMUNICATIONS SYSTEM - Method and system for tracking between two communications participants of an optical satellite communications system to provide a communication connection between the two communications participants. The method includes transmitting a signal from a first of the two communications participants to a second of the two communications participants, in which the second communications participant includes a detector arrangement with a plurality of detectors in a common receiving plane. The method also includes acquiring a phase of the signal at each of the plurality of detectors and determining phase differences between the phases via a phase-processor, determining from the phase differences a phase angle of an alignment of the signal to the receiving plane, processing the phase angle with a tracking computer in order to align the receiving plane of the second communications participant with the signal, whereby the phase difference becomes zero, and continuously calibrating the plurality of detectors of the detector arrangement. | 02-16-2012 |
| 20120039600 | METHOD AND ARRANGEMENT FOR IDENTIFYING AT LEAST ONE OBJECT - The invention relates to a method and an arrangement for identifying at least one object, wherein the object has a connection unit that can be connected to a receptacle unit of a receptacle arrangement, wherein contactless information transfer takes place between the connection unit and the receptacle unit if the connection unit is connected to the receptacle unit, wherein the contactless information transfer is realized as optical information transfer, wherein an optical signal having predetermined optical properties is generated and transmitted by at least one transmitting unit, is transferred via at least one optical transfer path and is received by at least one receiving unit, wherein an evaluation and control unit ( | 02-16-2012 |
| 20120039601 | USE OF POLARIZATION FOR DIFFERENTIATION OF INFORMATION - The present invention discloses a system for signalling within optical or combined optical/electronic networks wherein a first transmission node executes polarization multiplexing on transmitted traffic, and at one or more intermediate nodes one or more of the following processes are carried out on the sent traffic: demultiplexing by polarization and/or polarization and/or SOP-alignment. Further a method for packet handling within optical packet switched networks where, at a first transmission node carries out polarisation demultiplexing of transmitted traffic, and at one or a number of intermediate nodes carries out one or more of the following processes on the transmitted traffic; demultiplexing by polarisation, and/or polarisation and/or SOP-alignment. Said separation into states of polarisation is used in separation of QoS-classes. | 02-16-2012 |
| 20120045200 | Upgraded Bandwidth Map for Ten Gigabit Passive Optical Network - An apparatus comprising an optical line terminal (OLT) configured to transmit a bandwidth map (BWmap) for a plurality of burst signals to be transmitted by a plurality of optical network units (ONUs), wherein the BWmap comprises a plurality of allocations, and wherein each allocation comprises a start time for the allocation, a grant size for the allocation, and a header error correction (HEC) for the allocation. | 02-23-2012 |
| 20120057866 | REDUNDANT RING RESONATORS OF VARYING DIMENSIONS TO REDUCE RING RESONATOR TUNING REQUIREMENTS - Various embodiments of the present invention relate to systems for reducing the amount of power consumed in temperature tuning resonator-based transmitters and receivers. In one aspect, a system comprises an array of resonators ( | 03-08-2012 |
| 20120063768 | METHOD AND SYSTEM FOR CANCELLATION OF CHROMATIC DISPERSION COMBINED LASER PHASE NOISE - Methods and systems are provided for cancellation of chromatic dispersion combined laser phase noise. A method may include measuring a differential of laser phase noise using two optical pilot signals, the pilot signals each having a different optical frequency, or using an optical carrier and a pilot signal. The method may also include determining an approximate laser phase noise present in an optical system based on the measured differential of laser phase noise. The method may further include compensating for laser phase noise based on the determined approximate laser phase noise. | 03-15-2012 |
| 20120063769 | Bandwidth Provisioning for an Entangled Photon System - A quantum key distribution system is deployed in an optical fiber network transporting classical data traffic. A source of entangled photon pairs is used to generate quantum keys. Classical data traffic is typically transported over channels in the C-band. If a pair of channels for transport of quantum data is available within the C-band, then the source of entangled photon pairs is tuned to emit in a pair of channels in the C-band. If a pair of channels for transport of quantum data is not available within the C-band, then the source of entangled photon pairs is tuned to emit in a pair of channels in a combined S-band and L-band. When a periodically-poled lithium niobate waveguide pumped with a laser is used for the source of entangled photon pairs, the output spectral properties are tuned by varying the temperature of the waveguide. | 03-15-2012 |
| 20120063770 | PON SYSTEM, STATION SIDE APPARATUS, AND SUBSCRIBER SIDE APPARATUS - An OLT transmits an inquiry frame for checking a link and checking a data accumulation amount from an ONU. The ONU returns an inquiry response frame. When the ONU detects no uplink-traffic, the ONU writes to that effect on the response frame and transmits the response frame to the OLT. The OLT monitors a downstream traffic. When the OLT recognizes, based on a result of the monitoring or the inquiry response frame, no uplink or downstream traffic, the OLT instructs the ONU to transition to a low power consumption mode. When the ONU receives the instruction, the ONU transitions a function unit corresponding to instruction content to the low power consumption mode. When the ONU does not receive the inquiry frame for a predetermined time, the ONU transitions function units other than a function unit that performs communication control to the low power consumption mode. The OLT stops the transmission of the inquiry frame while the subscriber side apparatus transitions to the low power consumption mode. | 03-15-2012 |
| 20120070147 | COMMUNICATION SYSTEM AND COMMUNICATION APPARATUS - Communication arrangements wherein each of ONUs of a first or second PON transmits data toward a connected first or second OLT after a wait time period designated by the connected first or second OLT; the first communication device of the first packet communication network sends a first frame for measuring communication time period, to the second communication device of the second packet communication network through the first PON, and sends a second frame for measuring communication time period, to the second communication device through the second PON; and the second communication device calculates a difference of communication time period between the received first and second frames, and instructs the first or second OLT of the first or second PON, for correcting a wait time period which is set to the one or plural ONUs connected to the first or second OLT, based on the difference between communication time periods. | 03-22-2012 |
| 20120076491 | AVERAGE LENGTH MAGNITUDE DETECTING APPARATUS, AND METHOD - The present invention relates to an average length magnitude detecting apparatus and method, and an optical coherent receiver. The average length magnitude detecting method is adopted for detecting whether an average length of an averager used by a polarization crosstalk canceling apparatus in a receiver is long or short, comprising: determining a magnitude of a residual polarization crosstalk coefficient of the receiver; and determining an index that indicates whether the average length of the averager is long or short according to the determined magnitude of the residual polarization crosstalk coefficient. | 03-29-2012 |
| 20120076492 | METHOD FOR ROUTING INFORMATION OVER A NETWORK EMPLOYING CENTRALIZED CONTROL - A method and apparatus for centralized control of a network is described. The network includes a number of nodes. The method includes creating a database and storing the database on a master node of the network. The database contains topology information regarding a topology of the network. Each of the nodes is coupled to at least one other of the nodes, with the master node being one of the nodes. | 03-29-2012 |
| 20120082449 | METHOD, DEVICE AND SYSTEM FOR OPTICAL NETWORK SWITCHING PROTECTION - In the field of optical communications technologies, a method and a system for optical network switching protection are provided, to solve the problem of long service interruption time during active-standby switching in the prior art. One optical terminal apparatus is selected as a ranging optical terminal apparatus after a service is switched from an active optical central office end apparatus to a standby optical central office end apparatus; a delay difference between delay from the ranging optical terminal apparatus to the standby optical central office end apparatus and delay from the ranging optical terminal apparatus to the active optical central office end apparatus respectively is obtained; and time at which data sent by all the optical terminal apparatuses reaches the standby optical central office end apparatus is synchronized according to the delay difference. The method and the system are mainly used in an optical communication system. | 04-05-2012 |
| 20120087651 | FREQUENCY RESPONSE MEASUREMENT SYSTEM AND METHOD - A frequency response signal transmitting device for frequency response measurement includes: a first oscillator unit configured to generate a clock signal; a clock and data recovery (CDR) unit configured to remove a jitter component of the clock signal; a pulse signal generation unit configured to receive an output signal of the CDR unit and generate a pulse signal repeated at a predetermined period; and an optical signal transmission unit configured to receive the output signal of the CDR unit and apply the received signal to an optical cable. | 04-12-2012 |
| 20120087652 | OPTICAL COMMUNICATION DEVICE AND POWER-SAVING CONTROL METHOD OF OPTICAL COMMUNICATION DEVICE - A power-saving mode flag generating unit | 04-12-2012 |
| 20120087653 | OPTICAL TRANSMISSION APPARATUS AND OPTICAL TRANSMISSION METHOD - An optical transmission apparatus in which, even if a change is made in the bit rate of modulation signals that are inputted to a plurality of optical modulating units, the modulation signals do not suffer from phase shifting, thereby enabling achieving synchronous modulation in the plurality of optical modulating units and enabling achieving a high optical signal quality. The optical transmission apparatus includes: a plurality of optical modulating units that modulate light on the basis of modulation signals; and a delay amount control unit that, based on bit rate information indicating a bit rate of the modulation signals, controls delay amounts of the modulation signals to be inputted to the plurality of optical modulating units, such that the light is modulated in a synchronous manner in the plurality of optical modulating units. | 04-12-2012 |
| 20120093500 | DYNAMIC BANDWIDTH ALLOCATION APPARATUS AND METHOD AND OPTICAL LINE TERMINAL IN PON SYSTEM - A dynamic bandwidth allocation apparatus | 04-19-2012 |
| 20120099854 | Layer One Path Delay Compensation - A network component comprising a forwarding physical layer (PHY) unit comprising a source queue (SQ), wherein the forwarding PHY unit is configured to measure a one-way physical layer delay between the forwarding PHY unit and a destination node. Also disclosed is a network component comprising a forwarding PHY unit configured to send a plurality of symbols at a network physical layer to a destination node and receive the symbols at a network physical layer from the destination node, and a SQ configured to queue the symbols returned from the destination node, wherein the forwarding PHY unit is further configured to process the queued symbols to calculate a half round-trip delay based on a virtual delay time. | 04-26-2012 |
| 20120099855 | Domain-Independent Persistent Fibre Channel Identifiers - A Fibre Channel switch and related methods are provided for a relative addressing scheme for domain values used by the switch to avoid losing other portions of a Fibre Channel identifier if a particular run-time domain becomes invalid. At a Fibre Channel switch, data is stored that assigns a relative domain field value to a run-time domain in one of a plurality of virtual storage area networks. The relative domain field value used for a Fibre Channel identifier is determined for each of a plurality of devices connected to the Fibre Channel switch based on the run-time domain of the respective devices and the virtual storage area network in which the respective devices are active. A Fibre Channel identifier is stored in a memory of the Fibre Channel switch for each of the plurality of devices. The Fibre Channel identifier comprises the relative domain field value determined for the device together with area and port values for the device. The relative domain value is either a reserved domain field value for an existing virtual storage area network or any of the regular domain field values for a new virtual storage area network. The reserved domain field value is a domain field value that is not to be explicitly used in a Fibre Channel network for Fibre Channel identifiers according to the applicable Fibre Channel industry standards. | 04-26-2012 |
| 20120106950 | METHOD AND SYSTEM FOR OPTICAL NETWORK SMART TIMER MANAGEMENT VIA DELAY MEASUREMENT BETWEEN SPANS - A method and system for determining timers in an High Level Data Link Control (HDLC) Traffic Manager (HTM) state machine are disclosed. According to one aspect, the invention provides for determining a transit delay between two nodes by sending a first packet having a delay measurement byte to a second node that is on a link between the first node and the second node. The method also includes receiving a second packet with the delay measurement byte from the second node. The delay measurement byte sent by the second node is adjusted by the second node to indicate its receipt by the second node. A measured delay value is determined. The measured delay value is the delay between a time of sending the first packet to the second node and receiving the second packet from the second node. The measured delay value is determined by the hardware of the first node. Upon determining the measured delay value, timer values of the HTM state machine are set based on the measured delay value. | 05-03-2012 |
| 20120121253 | RANGING METHOD AND APPARATUS IN PASSIVE OPTICAL NETWORK - The present invention discloses a method for ranging in a passive optical network, and the method includes: obtaining a Round Trip Delay (RTD) between an Optical Line Terminal (OLT) and an Optical Network Unit (ONU); and opening a quiet window used for the ranging for the ONU according to the RTD to perform the ranging on this ONU. The present invention further discloses an apparatus for ranging in a passive optical network, and the apparatus includes: an obtainment module which is configured to: obtain a RTD between an OLT and an ONU; and a ranging module configured to: open a quiet window used for ranging for the ONU to perform ranging on the ONU according to the RTD. The present invention shortens the open time of the quiet window used for the ranging and improves the efficiency of the upstream transmission, and the implementation method is simple and convenient. | 05-17-2012 |
| 20120128349 | PASSIVE OPTICAL NETWORK SYSTEM, STATION SIDE APPARATUS AND POWER CONSUMPTION CONTROL METHOD - In a PON system having a station side apparatus (OLT) and plural home side apparatuses (ONUs), the station side apparatus includes an uplink frame transfer processing part controlling frame transfer from the home side apparatus to the station side apparatus, a transfer database managing the destination of frame transfer from the station side apparatus to the plural home side apparatuses, a statistical counter part counting transfer data amount for each user, and a user usage state management part managing the user usage situation. The user usage state management part determines the user usage situation (used/unused) based on the state monitoring result of any one or all of parts described above, switches the operation of the uplink frame transfer control part depending on the usage situation and adjusts DBA control frame amount between the station side apparatus and the home side apparatus. | 05-24-2012 |
| 20120128350 | BALANCED BYPASS CIRCULATORS AND FOLDED UNIVERSALLY-BALANCED INTERFEROMETERS - The invention generally relates, in one aspect, to an interferometer system. The interferometer system includes a splitter/combiner element (SCE), a first bi-directional optical path, and a second bi-directional optical path. | 05-24-2012 |
| 20120134667 | All-Optical, Phase Sensitive Optical Signal Sampling - An optical sampling arrangement for high-speed measurement of the time-varying electric field of an optical input signal utilizes coherent mixing of the optical input signal with a reference laser source in a phase-diverse optical hybrid solution, followed by optical sampling of the coherently-mixed fields at the output of the optical hybrid. The generated streams of optical samples are then detected and signal processed in order to reconstruct a sampled version of the electric field of the original optical input signal. | 05-31-2012 |
| 20120134668 | METHOD AND SYSTEM FOR MEASURING LATENCY - A system and method for measuring latency of an optical transport network includes generating a time stamp, transmitting the time stamp in an optical transport network, and processing the time stamp to measure latency of the optical transport network. | 05-31-2012 |
| 20120141119 | OPTICAL ACCESS SYSTEM, OPTICAL NETWORK UNIT, AND OPTICAL LINE TERMINAL - It is provided an optical access system, comprising an optical line terminal which is coupled to another network and optical network units which are coupled to the optical line terminal and to a plurality of user terminals. Each of the optical network units obtains a capacity of a buffer included in the each of the optical network unit and a link speed between the each of the optical network units and one of the plurality of user terminals that is coupled to the each of the optical network units; determines a sleep time based on the obtained capacity and the obtained link speed in a case where no communication frames are transmitted for a given period of time from any one of the plurality of user terminals and the optical line terminal; and sets in a sleep state for the determined sleep time. | 06-07-2012 |
| 20120141120 | Fuzzy Control Method and Apparatus for Signal Receiving Part in High Speed Wavelength Division Multiplexing System - The invention provides a fuzzy control method and apparatus for a signal receiving part in a high speed WDM system, wherein, the method comprises the following steps: step A, obtaining related information of each device in a receiving system and working environment parameter information of the receiving system; step B, according to the related information of each device and the working environment parameter information, finding out fuzzy control parameters which best match the related information of each device and the working environment parameter information from a fuzzy control parameter table stored in the system, and controlling the parameters of each device in the receiving system according to the fuzzy control parameters to make the system reach the best receiving balancing point. The invention can simplify the adjusting steps of the receiver and save the adjusting time. | 06-07-2012 |
| 20120148232 | METHOD AND SYSTEM FOR COMPENSATION OF LASER PHASE/FREQUENCY NOISE IN AN OPTICAL DEVICE - In accordance with embodiments of the present disclosure, a method for compensation of noise in an optical device is provided. The method may include calculating noise present in an optical carrier signal. The method may also include generating quadrature amplitude modulation input signals, the quadrature amplitude modulation input signals each including a term for compensation of the noise based on the calculated noise. The method may further include modulating the optical carrier signal to generate a modulated optical signal based on quadrature amplitude modulation input signals. | 06-14-2012 |
| 20120155859 | DETERMINING METROPOLITAN OPTICAL TRANSPORT NETWORK ARCHITECTURES OPTIMIZED FOR LONG TERM EVOLUTION (LTE) NETWORKS - A device receives Long Term Evolution (LTE) architecture information, Internet protocol (IP) network architecture information, and transport network information, and determines traffic patterns of a LTE network based on the LTE architecture information. The device also generates proposed LTE metropolitan optical transport networks (OTNs) based on the determined traffic patterns and one or more of the LTE architecture information, the IP network architecture information, and the transport network information. The device further determines transit switching for the proposed LTE metropolitan OTNs, and selects, from the proposed LTE metropolitan OTNs, a metropolitan OTN optimized for the LTE network. | 06-21-2012 |
| 20120155860 | OPTICAL PACKET SWITCHING SYSTEM AND OPTICAL PACKET TRANSMITTER DEVICE - An optical packet switching system includes: an optical packet transmitter device configured to transmit an optical packet signal; and an optical packet switching device configured to route and output an input optical packet signal. The optical packet transmitter device is configured to adjust gap time between optical packets transmitted. The optical packet transmitter device adjusts the gap time to a fixed value defined by time required for switching in the optical packet switching device. | 06-21-2012 |
| 20120163804 | APPARATUS AND METHOD FOR EFFICIENT OPTICAL LOSS MEASUREMENT - A measurement system that includes a power source and a power meter, said power source is configured to generate both a measurement signal and a power source communication signal, and said power meter is in communication with said power source and configured to receive both said measurement signal and said power source communication signal | 06-28-2012 |
| 20120163805 | OPTICAL NETWORK UNIT AND METHOD OF SAVING POWER THEREOF - Provided is an optical network unit saving power. The optical network unit may include a processor checking whether at least one downward physical block, the upward physical block and a data switching block operate in an idle mode, sequentially transiting at least one downward physical block, an upward physical block and a data switching block to a sleep mode according to the checking result and sequentially transiting an optical transmission-reception block and the medium access control block to a sleep mode by judging whether or not a medium access control block transits to a sleep mode. | 06-28-2012 |
| 20120163806 | OPTICAL LINE TERMINAL DEVICE AND OPTICAL NETWORK DEVICE - Disclosed is an optical line terminal device which includes a media access control (MAC) block configured to convert Ethernet packets and port identifiers into a downstream frame or an upstream frame into the Ethernet packets and the port identifiers; and a central processing unit (CPU) configured to control the MAC block, wherein the MAC block includes a traffic monitoring part which is configured to receive the port identifiers and to provide identifier information of an optical network device according to the port identifiers; and wherein the CPU is configured to generate a control frame for controlling a power supplied to the optical network device, according to identifier information of the optical network device. | 06-28-2012 |
| 20120189299 | OPTICAL RECEIVER - In pattern synchronization for correctly regenerating received data, which is performed in an optical receiver for receiving an optical signal that has been subjected to quadrature phase modulation, signal conduction is quickly established without using duplicate combinations of bit shifting and pattern changing. A control method that does not involve verifying the duplicate combinations generated in modulation formats and pattern synchronization search orders. Specifically, a signal check circuit ( | 07-26-2012 |
| 20120207468 | POWER-UP OF DEVICE VIA OPTICAL SERIAL INTERFACE - An optical communication serial interface is employed to power up a device from a powered down state to a powered on state. An optical receiver element receives serial optical signals transmitted by at least one optical fiber and converts the received serial optical signals to electrical signals. A low level reception converter detects and decodes the electrical signals to provide data and control words from detected and decoded normal electrical signals for a high level command processor. A power supply maintains low level power to at least the optical receiver element and the low level reception converter of the optical communication serial interface while the device is in the powered down state. The low level reception converter detects a particular abnormal sequence of electrical signals; and in response to detecting the particular abnormal sequence of electrical signals, asserts a control signal to power up the device controllable power supply. | 08-16-2012 |
| 20120213508 | NETWORK ELEMENT CLOCK SYNCHRONIZATION SYSTEMS AND METHODS USING OPTICAL TRANSPORT NETWORK DELAY MEASUREMENT - The present disclosure provides Network Element (NE) clock synchronization using Optical Transport Network (OTN) delay measurement systems and methods such as described in ITU-T G.709 (12/2009) “Interfaces for the Optical Transport Network (OTN)” and G.798 (10/2010) “Characteristics of optical transport network hierarchy equipment functional blocks”. OTN provides a Delay Measurement (DM) function to measure fiber path latency between two network elements to within microsecond accuracy. The convergence of packet switching and OTN transport into the same network element allows the sharing of this information between the two applications. The OTN delay measurement value can be used to synchronize two network element clocks to within microsecond accuracy without the need for a costly GPS synchronization solution or reduced accuracy NTP solutions. | 08-23-2012 |
| 20120213509 | Method and Passive Optical Network System for Managing Uplink Burst Overhead Parameters - A method for managing upstream burst overhead parameters includes: an Optical Line Terminal (OLT) or an Optical Network Unit (ONU) detects transmission quality of a downlink between the OLT and the ONU; the OLT or the ONU determines the upstream burst overhead parameters suitable for the ONU according to the transmission quality; and the ONU starts to use the upstream burst overhead parameters suitable for the ONU after the switching time determined by the ONU itself or indicated by the OLT. The present invention also provides an ONU and an OLT for managing the upstream burst overhead parameters. The present invention can improve the bandwidth utilization rate and decrease the complexity of indicating the upstream burst overhead parameters in PON system, so that the ONU and the OLT are enabled to flexibly and simply select the upstream burst overhead parameters. | 08-23-2012 |
| 20120213510 | SKEW ESTIMATOR, SKEW COMPENSATOR AND COHERENT RECEIVER - A skew estimator for estimating a skew between a first signal of a first data path and a second signal of a second data path in a coherent receiver is provided. The skew estimator comprises a phase detector and an integrator. The phase detector is configured to detect a phase of the first signal or the second signal to obtain a phase signal. Further, the integrator is configured to integrate the obtained phase signal to provide an estimated skew. | 08-23-2012 |
| 20120213511 | SYSTEM, METHOD, AND DEVICE FOR OPTICAL TRANSMISSION BASED ON POLARIZATION MULTIPLEXING - The embodiments of the present invention disclose a system, a method, and a device for polarization multiplexing. The method includes: co-direction judgment: after judging that the similarity between the control quantities of the two optical signals meets a predetermined similarity criterion, enabling at least one of the two branches to re-search for the control quantity until the similarity between the control quantities of the two optical signals does not meet the predetermined similarity criterion. The preceding technical solution may substantially prevent the optical signals output by the two branches at a receiving end from having the co-directional state of polarization, without affecting the complexity and implementation cost of the system and the processing time delay of data signals at the receiving end. | 08-23-2012 |
| 20120219284 | Method and Apparatus for Processing Tandem Connection Monitoring Level - The disclosure discloses a method for processing a Tandem Connection Monitoring (TCM) level, which comprises: obtaining a route of a service which needs to be configured TCM, obtaining a TCM segment on the route of the service, determining a TCM segment which needs to be configured from the obtained TCM segment, and allocating a TCM level for the TCM segment which needs to be configured according to a segment relationship between the TCM segment which needs to be configured and a configured TCM segment. The disclosure further discloses an apparatus for processing a TCM level. By means of the disclosure, a TCM level can be automatically allocated for a TCM segment and environment of multiple network applications can be applicable. | 08-30-2012 |
| 20120230675 | Ranging Method and System for Optical Network Unit in Passive Optical Network - The present invention discloses a ranging method for an optical network unit in a passive optical network, which includes: an Optical Line Terminal (OLT) performing ranging for an Optical Network Unit (ONU) in a operation state, updating an Equalization Delay (EqD) of the ONU according to a ranging result, and sending the updated EqD to the ONU; and the ONU implementing an upstream transmission synchronization according to the updated EqD. The present invention further discloses a ranging system for an optical network unit (ONU) in a passive optical network (PON), which includes a ranging device and an equalization delay updating device. In the present invention, the influence on the interruption of services of the ONU for which ranging is performed is reduced, and the time-sensitive services of the ONU for which ranging is performed are protected, thus improving the upstream transmission efficiency of the ONU. | 09-13-2012 |
| 20120230676 | TURN-UP AND LONG TERM OPERATION OF ADAPTIVE EQUALIZER IN OPTICAL TRANSMISSION SYSTEMS - In an optical transmission system which utilizes polarization multiplexing, a receiver includes an adaptive equalizer which is adjusted at turn-up such that two polarization modes at the equalizer output are time aligned. The adaptive equalizer may be reset in a directed manner in response to an indication that one polarization mode is present at both the first and second outputs. Further, the dominant filters taps of the adaptive equalizer are maintained near a middle of a tap index range. The receiver may also include an interpolation function upstream of the adaptive equalizer and a symbol timing error estimation function that feeds a control signal back to the interpolation function, wherein the interpolation function causes the adaptive equalizer function and symbol timing error estimation function to receive an integer number of samples per symbol. | 09-13-2012 |
| 20120230677 | Method and Device for Monitoring and Controlling Phase Difference Based on DQPSK Modulation - A method and a device for monitoring and controlling a phase difference based on DQPSK modulation are provided, and the method includes: performing the n | 09-13-2012 |
| 20120237204 | System and Method for Blind Frequency Recovery - Described herein are systems and methods for accurately estimating and removing a carrier frequency offset. One exemplary embodiment relates to a system comprising a frequency offset detection circuit detecting a carrier frequency offset in an optical signal, and a frequency testing circuit calculating an estimated frequency offset value of the carrier frequency offset, wherein the frequency testing circuit removes a carrier phase based on the estimated frequency offset value and recovers the optical signal. Another exemplary embodiment relates to a method comprising detecting a carrier frequency offset in an optical signal, calculating an estimated frequency offset value of the carrier frequency offset, removing a carrier phase based on the estimated frequency offset value, and recovering the optical signal. | 09-20-2012 |
| 20120237205 | SYSTEM AND METHOD TO COMPENSATE FOR ARBITRARY OPTICAL FIBER LEAD-INS IN AN OPTICAL FREQUENCY DOMAIN REFLECTOMETRY SYSTEM - A method for estimating a parameter includes: generating an optical signal, the optical signal modulated via a modulation signal having a variable modulation frequency over a period of time; transmitting the modulated optical signal from a light source into an optical fiber, the optical fiber including at least one sensing location configured to reflect light; receiving a reflected signal including light reflected from the at least one sensing location; and demodulating the reflected signal with a reference signal, the reference signal including a time delay relative to the modulation signal based on a distance between the light source and the at least one sensing location. | 09-20-2012 |
| 20120237206 | SYSTEM AND METHOD FOR REDUCING INTERFERENCE OF A POLARIZATION MULTIPLEXED SIGNAL - In accordance with the present disclosure, disadvantages and problems associated with polarization dependent effects of a polarization multiplexed optical signal may be reduced through polarization scrambling. In accordance with an embodiment of the present disclosure a method for detecting polarization scrambling of a polarization multiplexed optical signal comprises receiving a polarization multiplexed optical signal associated with an optical network. The polarization multiplexed optical signal including a scrambled polarization orientation, the polarization orientation scrambled according to a scrambling frequency. The method further comprising receiving a polarization signal indicating the polarization scrambling of the received optical signal. The method additionally comprises descrambling the optical signal according to the polarization scrambling as indicated by the polarization signal. | 09-20-2012 |
| 20120237207 | METHOD AND APPARATUS FOR OPTICAL PATH VALIDATION IN AN OPTICAL NETWORK - The invention relates to a method in a border node of an optical network and in an external optical channel originating apparatus and to a border node of an optical network and a router. The invention is particularly applicable to optical path validation in an optical network for an externally originating optical channel. The invention may be used during an optical path fault recovery operation. | 09-20-2012 |
| 20120237208 | TRANSMITTING DEVICE AND INFORMATION ACQUISITION CONTROL METHOD - an apparatus includes a first counter circuit that counts a value of first statistical information divided in the time-direction from a first period; a second counter circuit that counts a value of second statistical information divided in the time-direction from a second period following the first period; a control circuit that divides by a specific time period unit and acquires the value of the first statistical information and the value of the second statistical information, and causes a first memory to store the value of the first statistical information, and causes a second memory to store the value of the second statistical information; and a switching circuit that switches the value of the statistical information acquired by the control circuit from the value of the first statistical information to the value of the second statistical information upon a start of the second period. | 09-20-2012 |
| 20120237209 | Communication method using the entangled state - The first photon in single-photon state is divided into two components by the half beam splitter, and the first component is sent to the sender while the second component is sent to the receiver. The sender measures the first component of the first photon when he sends “1”. The sender doesn't measure the first component of the first photon when he sends “0”. The receiver makes the second component of the first photon enter into the Sagnac interferometer, and the receiver also makes the reference light enter into the Sagnac interferometer at the same time. The receiver makes the second component of the first photon interact with the reference light in the nonlinear optical medium arranged in the Sagnac interferometer. The receiver knows the signal from the phase modulation of the reference light caused by the interaction with the second component of the first photon. | 09-20-2012 |
| 20120237210 | Communication method using the entangled state - The sender and the receiver prepare two photons in the entangled state of polarization. The first photon of the two photons is sent to the sender and the second photon of the two photons is sent to the receiver. The sender measures the first photon after the first photon pass the polarizer in which the vertical polarized photon can pass, when the sender sends the signal “1”. The sender measures the first photon after the first photon pass the polarizer in which the 45 degrees polarized photon can pass, when the sender sends the signal “0”. The receiver measures the second photon by the balanced homodyne measurement. And, the receiver knows the signal from the absolute value of the result of the balanced homodyne measurement. | 09-20-2012 |
| 20120243866 | FAULT ANALYSIS AND MONITORING APPLICATIONS USING OUT-OF-BAND BASED MODULES - One example embodiment includes a testing device. The testing device comprises a signal reception element, an out-of-band detector and testing logic. The signal reception element is configured to receive a physical layer signal from a communication module via a physical link and to produce an incoming double modulated signal, the incoming double modulated signal including a high-speed data signal and an out-of-band data signal. The out-of-band data signal comprises diagnostic data of the communication module. The out-of-band detector is coupled to the signal reception element and is configured to extract the out-of-band data signal from the incoming double modulated signal. The testing logic is coupled to the out-of-band detector and is configured to extract and analyze the diagnostic data from the out-of-band data signal. | 09-27-2012 |
| 20120251100 | Operational Status Flag Generation in an Optical Transceiver - Methods, algorithms, architectures, circuits, and/or systems for determining the status of parameters associated with optical transceiver operation are disclosed. The optical transceiver can include an optical receiver to receive optical data; an optical transmitter to transmit optical data; one or more memories to store data (and, optionally, thresholds) for each of a plurality of parameters that are related to operation of at least one of the optical receiver and the optical transmitter; a microprocessor that compares the parametric data against the threshold(s) to calculate one or more flags to indicate whether a corresponding parameter has exceeded the first or second threshold; and an interface that receives a flag request from a host, and provides the one or more flags in response to the request. In the present disclosure, the microprocessor may calculate the one or more flags only in response to the flag request from the host. | 10-04-2012 |
| 20120251101 | Apparatus to Control Carrier Spacing in a Multi-Carrier Optical Transmitter - Consistent with the present disclosure, data, in digital form, is received by a transmit node of an optical communication system, and is then provided to a modulator that, in turn, modulates light, received from an optical source at one of a plurality of periodically and preferably minimally spaced wavelengths. The plurality of periodically spaced wavelengths or carriers are grouped together with minimal carrier spacing, to form a superchannel. The carrier spacing between adjacent carriers is determined by detecting a beat frequency of a combined optical signal that includes the outputs of two adjacent optical sources. The beat frequency corresponds to a frequency difference between the outputs of the adjacent carriers. This frequency difference should correspond to a desired carrier spacing between each of the plurality of carriers. A frequency error between the beat frequency and the desired carrier spacing is then measured by down-converting the beat frequency with respect to a target reference frequency corresponding to the desired carrier frequency spacing. Based on the determined frequency error, the optical sources are controlled to adjust in frequency to minimize or reduce the frequency error to zero. For every pair of adjacent carriers, the corresponding outputs of the optical sources are compared in the above manner to determine a plurality of frequency errors. Each optical source can thus be tuned in order to realize a precise carrier spacing between each of the adjacent carriers. | 10-04-2012 |
| 20120251102 | LIGHT RECEIVING CIRCUIT AND BANDWIDTH CONTROL METHOD - A light receiving circuit includes: a filter, arranged in a downstream of an electric signal amplifier to amplify an electric signal based on a light signal, to adjust a bandwidth of an amplified electric signal; a monitor circuit to monitor a communication quality of the light signal and output a monitored value; and a control circuit to control a bandwidth of the filter based on a control value corresponding to the monitored value. | 10-04-2012 |
| 20120257888 | OPU FRAME GENERATING DEVICE AND OPU FRAME TEST DEVICE - An OPU frame generating device includes a frequency setting unit that sets a frequency corresponding to a bit rate of data which can be stored in a payload area, a parameter calculating unit that calculates a parameter C | 10-11-2012 |
| 20120257889 | COMMUNICATION APPARATUS WITH TRANSMITTED RATE DETECTING FUNCTION AND METHOD THEREOF - A communication apparatus with transmitted rate detecting function and the method therefore is provided. The communication apparatus receives an input signal transmitted at a first rate or a second rate from a remote apparatus. The method includes setting the communication apparatus to operate at an initial receiving rate; sampling the input signal by a specific sampling frequency to generate a sample result; estimating the input transmitted rate of the input signal according to the sample result so as to set the receiving rate of the communication apparatus at a working rate; and communicating with the remote apparatus at the working rate. The second rate is higher than the first rate, and the specific sampling frequency is associated with the initial receiving rate. | 10-11-2012 |
| 20120263454 | Crosstalk-Free High-Dimensional Constellations for Dual-Polarized Nonlinear Fiber-Optic Communications - A method reduces time-varying polarization crosstalk due to XPolM by transmitting multi-dimensional orthogonal constellations. Three variants of crosstalk-free constellations are provided: Grassmann constellations, unitary constellations, and rotation codes. The method uses the Grassmann constellations and the unitary constellations to deal with fiber nonlinearity by applying as a polarization-time coding. The rotation codes exploit a fiber channel characteristic to improve performance and to reduce computational complexity. The underlying orthogonality behind those constellations enables the receiver to decode it as if there is no polarization crosstalk. Moreover, the required computational complexity at the receiver is significantly reduced because neither crosstalk cancellers nor channel estimators are needed. | 10-18-2012 |
| 20120263455 | METHOD AND SYSTEM FOR CALCULATING SPECTRUM GRANULARITY IN FLEXIBLE GRID OPTICAL NETWORKS - In accordance with embodiments of the present disclosure, a method may include determining individual spectrum requirements for each of a plurality of signals to be communicated in an optical network, wherein a first signal of the plurality of signals has a first spectrum requirement and a second signal of the plurality of signals has a second spectrum requirement. The method may also include calculating a minimum spectrum granularity based on the individual spectrum requirements. The method may further include assigning each particular signal a channel spectrum equal to an integer multiple of the minimum spectrum granularity. | 10-18-2012 |
| 20120263456 | SKEW SUPPRESSION METHOD AND OPTICAL TRANSMISSION SYSTEM - A method for suppressing a skew between a first channel and a second channel in an optical transmission system having a transmitter that transmits an optical signal with the first channel and the second channel and a receiver that receives the optical signal, the method includes: controlling dispersion added to the optical signal to be larger than a specified amount; and controlling a delay time of at least one of the first channel and the second channel in the receiver based on a quality of the optical signal monitored in the receiver to suppress the skew between the first channel and the second channel in the receiver. | 10-18-2012 |
| 20120263457 | TECHNIQUE FOR MONITORING OPTICAL NETWORKS - A technique for monitoring at least a network portion of an optical communication network, by monitoring changes of a decision threshold used for discriminating a digital optical signal being propagated via the network portion. | 10-18-2012 |
| 20120275780 | Receivers Based on Closed-Form Parametric Estimates of the Probability Density Function for the Received Signal - A closed-form parametric approach to channel-estimation is provided. In one aspect, a specific parametric expression is presented for the received signal pdf that accurately models the behavior of the received signal in IM/DD optical channels. The corresponding parametric channel-estimation approach simplifies the design of MLSE receivers. The general technique lends itself well to the estimation of the signal pdf in situations where there are multiple sources of noise with different distributions, such as ASE noise, together with Gaussian and quantization noise, and signal-dependent noise, for example. | 11-01-2012 |
| 20120275781 | SWITCH SYSTEM AND METHOD FOR THE MONITORING OF VIRTUAL OPTICAL PATHS IN AN OPTICAL BURST SWITCHED (OBS) COMMUNICATION NETWORK - The invention provides an optical burst switch in an Optical Burst Switched (OBS) communication network, said optical burst switch comprising means for monitoring and maintaining mesh of virtual optical paths from a communication node to a plurality of other communication nodes, arranged in a ring network, enabling traffic data to be transmitted and/or received between nodes via a physical optical path. The switch also provides means for sending a data packet probe on a virtual path from a node to each other node in the OBS communication network, wherein data packet probe information received at said switch provides information of availability of the physical optical path for sending traffic data between nodes. The switch can be configured such that the rate at which this path monitoring is scheduled guaranteeing less than 50ms protection switch in the event of monitoring a failed or degraded path. | 11-01-2012 |
| 20120275782 | METHOD AND APPARATUS FOR PREVENTING SIGNAL INTERFERENCE IN A PASSIVE OPTICAL NETWORK - A method removes signal interference in a passive optical network. The passive optical network includes an optical line terminal, a splitting unit coupled with the optical line terminal, an optical network unit coupled with the splitting unit, and an identification signal uniquely associated with the optical network unit. The method includes the steps of sending a first signal, detecting the first signal, comparing the detected first signal with an identification signal and decoupling the optical network unit from the splitting unit if the comparing step results in a mismatch. | 11-01-2012 |
| 20120281979 | OPTICAL NETWORK WITH LIGHT-PATH AGGREGATION - A method comprising identifying a data demand of an optical channel request; identifying available resources for satisfying the optical channel request; selecting light paths to a destination based on the identified available resources, wherein each light path is distinct; selecting one or more optical carriers for each light path; optically transmitting data pertaining to the optical channel request based on the selected light paths, wherein each selected optical carrier of each light path carries a portion of the data and a total of the one or more optical carriers associated with the light paths collectively carry an entire portion of the data; receiving the one or more optical carriers of the light paths at the destination; identifying a latency between the one or more optical carriers of the light paths; adjusting the latency between the one or more optical carriers of the light paths; and assembling the data. | 11-08-2012 |
| 20120288275 | Polarization and Differential-Group-Delay Insensitive Digital Timing Error Detection for Polarization-Multiplexed Coherent Optical Systems - Digital timing error detection systems and techniques are described. The described techniques are independent of polarization and differential-group-delay and are used to perform timing recovery of polarization-multiplexed coherent optical systems. | 11-15-2012 |
| 20120301138 | NETWORK SYSTEM WITH ENERGY EFFICIENT FIBER PORT - An approach for saving power in a fiber ports of a network system is provided. An instance of a period of inactivity for a fiber port of the network system is determined. Power delivery to a transmit laser of an SFP (small form-factor pluggable) device of the fiber port is terminated during at least a portion of the period of inactivity. Power delivery to the SFP device is maintained while power delivery to the transmit laser is terminated. | 11-29-2012 |
| 20120308226 | METHOD AND APPARATUS FOR DISTRIBUTING NETWORK TIMING IN A MESH OPTICAL NETWORK - The disclosed methods and apparatuses provide a unique and cost efficient approach to using traffic channels of an optical mesh network, and sometimes optical supervisory channels, for carrying timing information (e.g., BITS timing signals), thus eliminating the need to use external BITS sources at remote add/drop nodes of a network. Planning the distribution of timing in such an optical mesh network includes identifying in the network a source node associated with an external timing source, identifying optical light paths between nodes in the network, and, for nodes other than the source node, selecting optical light paths originating either directly or indirectly from the source node to use to derive timing information. | 12-06-2012 |
| 20120308227 | DIGITAL COHERENT RECEIVER AND PHASE CONTROL METHOD - A digital coherent receiver includes a sampling phase detector to detect a phase of a sampled digital signal, and a phase adjustor to adjust the sampling phase of the digital signal based upon the detected phase. The phase detector includes filters to equalize the digital signal with different equalization characteristics; sensitivity monitoring phase detectors, each connected to one of the filters and outputting a phase detection signal representing the phase of the output signal from the associated filter together with a sensitivity monitoring signal representing the sensitivity of the phase detection; sensitivity correction coefficient generators, each generating a sensitivity correction coefficient for correcting the associated phase detection signal using a square sum of the sensitivity monitoring signals; and an adder to add the phase detection signals that have been corrected by the sensitivity correction coefficients, and output a phase signal. | 12-06-2012 |
| 20120308228 | OPTICAL LINE TERMINAL, BANDWIDTH CONTROL METHOD AND OPTICAL NETWORK SYSTEM - An example is a bandwidth control method employed in an optical line terminal including: determining a first time point at which a first optical network unit starts the processing of transitioning between the states in a case where the first optical network unit is to be transitioned between the states; transmitting a state control signal containing the first time point to the first optical network unit in order to control the first optical network unit to start the processing of transitioning between the states; and stopping allocating a bandwidth used to transmit a signal to the optical line terminal to a second optical network unit during a period from the first time point until it is determined that the first optical network unit has finished the processing of transitioning between the states. | 12-06-2012 |
| 20120308229 | METHOD AND ARRANGEMENT FOR STABILIZING A COLOR CODING METHOD FOR OPTICAL TRANSMISSION OF DATA - A method for optically transmitting data between a transmitter and a receiver is provided, wherein a color coding method based on a plurality of elementary colors is provided for encoding and transmitting the data, wherein each elementary color is transmitted by a transmitter-side optical radiation source and is received on the receiver side by an optical radiation receiver. The method includes transmitting a training request message comprising calibration information formed on the transmitter side; forming a channel properties matrix by the receiver from the calibration information and storing the channel properties matrix in the receiver; calculating at least one compensation information on the basis of a reference channel properties matrix stored in the receiver and the reference channel properties matrix; and transmitting the compensation information from the receiver to the transmitter. | 12-06-2012 |
| 20120328284 | OPTICAL PACKET SWITCHING APPARATUS - An optical packet switching apparatus includes an optical coupler for branching off a received optical packet signal, an optical switch unit for switching the route of one of the branched-off optical packet signals so as to be outputted, and an optical switch control unit for controlling the optical switch unit. The optical switch control unit includes an optical-to-electrical conversion unit for converting the other of the branched-off optical packet signals into an electrical packet signal, a serial/parallel conversion unit capacitively coupled to the optical-to-electrical conversion unit, a packet density detector for detecting the packet density of the received packet signal, and a DC offset adjustment unit for adjusting the DC offset voltage of the packet signal, inputted to the serial/parallel conversion unit, according to the packet density information detected by the packet density detector. | 12-27-2012 |
| 20120328285 | INTELLIGENT OPTICAL MODULE CAPABLE OF RESTARTING REMOTELY FROM HOST SYSTEM - An intelligent optical module to restart itself according to a command sent from the host system is disclosed. The optical module may distinguish the first state, where no optical signal is received, from the second state, where a substantial optical signal but unmodulated is received. The optical module is restarted when the second state appears with a preset pattern. | 12-27-2012 |
| 20130004157 | OPTICAL DETECTOR - A technique includes using an emitter of an optical detector to emit a first optical signal and a receiver to acquire measurement of a second optical signal generated due to interaction of the first optical signal with a target. The technique includes scaling the acquired measurement based on a measure of optical crosstalk communication between the emitter and the receiver. | 01-03-2013 |
| 20130004158 | CHANNEL DE-SKEWING FOR A COHERENT OPTICAL RECEIVER - A system may receive a group of electrical signals from an optical receiver and via a group of channels; identify a first signal, as a reference signal, that is received via a first channel; and identify a second signal, as an orthogonal signal, that is received via a second channel, where the second signal may be orthogonal to the first signal. The system may further measure a group of skew values based on a difference in arrival times between one or more other signals, of the group of electrical signals, and the reference signal or the orthogonal signal; generate a group of de-skew values based on at least a portion of the skew values; and transmit the de-skew values, to the optical receiver, where transmitting the de-skew values allows the optical receiver to de-skew signals on the group of channels. | 01-03-2013 |
| 20130004159 | CONTROL DEVICE, OPTICAL RECEIVING DEVICE, AND CONTROL METHOD - A control device includes: a first computing circuit which manipulates a parameter that changes a first characteristic in a processing device on the basis of a result of detecting the first characteristic of the processing device; an updating control circuit which stops the first computing circuit from manipulating the parameter when updating a function of the first computing circuit; an acquisition circuit which acquires relationship information indicating a relationship between an amount to be manipulated for the parameter and the amount of change in a second characteristic of the processing device that changes the first characteristic; and a second computing circuit which manipulates the parameter by an amount to be manipulated based on the relationship information acquired by the acquisition circuit and the amount of change in a result of detecting the second characteristic, while the first computing circuit is stopped from manipulating the parameter by the updating control circuit. | 01-03-2013 |
| 20130004160 | METHODS AND ARRANGEMENTS IN OPTICAL NETWORK - Methods and arrangements for time distribution in an optical network system in the upstream direction. The information of a selected time reference frame and a calculated time stamp value of the frame based on a real-time clock of the optical line terminal (OLT) is sent from the OLT to the optical network unit (ONU) via the optical distribution network (ODN). When the time reference frame is sent to the ONU from the OLT via the ODN, the ONU records the arrival time of the frame based on a time reference made by the real-time clock of the ONU. The time difference between the arrival time and the time stamp value is calculated whereupon the OLT is informed of the calculated time difference. The OLT adjusts the real-time clock of the OLT in accordance with the time difference. | 01-03-2013 |
| 20130004161 | OPTICAL POWER ADJUSTMENT METHOD FOR ETHERNET PASSIVE OPTICAL NETWORK SYSTEM, AND OPTICAL LINE TERMINAL - The present invention provides optical power adjustment method for EPON system, and OLT. The method comprises: OLT starting optical power adjustment procedure after ONU or ONT successfully registers, receiving upstream data from the ONU or the ONT ( | 01-03-2013 |
| 20130011133 | DIFFERENTIAL EYE DIAGRAMS - Changes in a signal are detected. The signal is repeatedly sampled in a synchronous manner during a predetermined interval to generate a captured eye diagram. At least one of a positive differential eye diagram or a negative differential eye diagram is generated from the captured eye diagram and a baseline eye diagram. The at least one positive or negative differential eye diagram is analyzed to determine whether a change in signal conditions is present. | 01-10-2013 |
| 20130016965 | OPTICAL RECEIVER/TRANSMITTER WITH CIRCUIT FOR DETERMINING MODULATION AMPLITUDE - A method for an optical transmitter, receiver or transceiver allowing determination of a signal property of a first binary signal such as the modulation amplitude. The method applies a reference stage which is modulated by the signal content of the first binary signal to allow the determination. | 01-17-2013 |
| 20130016966 | Method and Arrangement for Transmitting an Orthogonal Frequency Diversity Multiplex Signal via at Least One Optical FilterAANM Jansen; SanderAACI MunichAACO DEAAGP Jansen; Sander Munich DEAANM Van Den Borne; DirkAACI MunchenAACO DEAAGP Van Den Borne; Dirk Munchen DE - The invention describes method and an arrangement for transmitting an orthogonal frequency diversity multiplex signal via an optical filter. OFDM channels located near an edge of an OFDM spectrum are copied and shifted to an opposite edge of the OFDM spectrum and transmitted via the optical filter. At the receiver symbols are derived from original and the copied OFDM channels. Then the symbols having a better signal quality are elected for further processing. | 01-17-2013 |
| 20130022351 | OPTICAL TRANSMITTING/RECEIVING SYSTEM AND TIMING EXTRACTING METHOD IN OPTICAL TRANSMITTING/RECEIVING SYSTEM - An optical transmitting/receiving system using a timing extracting method that allows a feed forward type of optimized structure exhibits increased cost and increased power consumption, therefore, an optical transmitting/receiving system according to the present invention includes an optical transmitter apparatus including a light source, an optical modulator, and a pseudo RZ carver; and an optical receiver apparatus including a coherent receiver, an AD converter, a main signal processing unit, and a timing extracting unit; wherein the pseudo RZ carver forms a dip in an optical signal phase-modulated with a frequency f by the optical modulator by dropping the optical intensity at a symbol transition point to approximate zero per n-symbol interval; the AD converter outputs a sample obtained by AD converting an electrical signal which is detected and outputted by the coherent receiver; the timing extracting unit extracts a clock component of a frequency f/n from the sample and derives from the clock component a timing error signal which represents a deviation from optimum sampling timing; and the main signal processing unit adjusts a sampling timing on the basis of the timing error signal. | 01-24-2013 |
| 20130028593 | OPTICAL RECEIVER FOR RECEIVING LIGHT AND OPTOELECTRONIC MEASURING ARRANGEMENT - The present invention relates to an optical receiver ( | 01-31-2013 |
| 20130028594 | Method and System for Detecting Optical Fibre Connection - The disclosure claims a method and system for detecting optical fibre connection. The method comprises: a single board judges whether the received connection information of downstream single board, connection information of upstream single board and connection information of the single board is the reported current optical fibre connection relationship information; if no, reporting the received connection information to network management system; the network management system generates the optical fibre matching connection relationship information of all single boards currently installed according to the actual installation condition of the single board, and determines whether the reported current optical fibre connection relationship information is the correct optical fibre connection relationship according to the optical fibre matching connection relationship information; if yes, displaying the current optical fibre connection relationship information; otherwise, prompting that currently it is the wrong optical fibre connection relationship, and displaying the optimal optical fibre connection relationship information. | 01-31-2013 |
| 20130028595 | FREQUENCY OFFSET ESTIMATING METHOD AND FREQUENCY OFFSET ESTIMATING APPARATUS - When a circuit that calculates a frequency offset using a shape of a frequency spectrum is implemented by hardware, the circuit size can be reduced. A frequency offset estimating method for estimating the difference between a carrier frequency of a reception signal and the frequency of an output signal of a local oscillator includes performing a discrete Fourier transform on a reception signal previously sampled at a predetermined sampling frequency and outputting a frequency spectrum with a plurality of frequency components, calculating an average power of the frequency spectrum, calculating a threshold by adding a predetermined value to the average power or power obtained by multiplying the average power by a constant, performing 1-bit quantization on powers of the frequency components of the frequency spectrum based on the threshold, and calculating a centroid frequency by multiplying frequencies of the frequency components by powers of 1-bit quantized frequency components, calculating the sum of multiplied products, and dividing the sum of the products by the sum of the powers of the 1-bit quantized frequency components of the frequency spectrum. | 01-31-2013 |
| 20130028596 | OPTICAL RECEIVER, OPTICAL RECEPTION DEVICE, AND CORRECTION METHOD FOR OPTICAL RECEIVED INTENSITY - In the optical receiver available for the RZ-DPSK modulation system, the difference in the received intensity due to the difference in the intensity or optical path of the optical signal cannot be corrected automatically, therefore, an optical receiver according to an exemplary aspect of the invention includes a first photodiode receiving a normal phase optical signal from a first output of a 1-bit delayed interferometer and outputting a positive signal; a second photodiode receiving a reversed phase optical signal from a second output of the 1-bit delayed interferometer and outputting a complementary signal; a differential transimpedance amplifier inputting the positive signal and the complementary signal and including a closed feedback loop for each input of the positive signal and the complementary signal; a level adjustment unit adjusting a signal level in the closed feedback loop; a photoelectric current detection unit detecting a photoelectric current generated in each of the first photodiode and the second photodiode; and wherein the level adjustment unit adjusts the signal level on the basis of an output of the photoelectric current detection unit. | 01-31-2013 |
| 20130034351 | FIBER OPTIC PERSONNEL SAFETY SYSTEMS AND METHODS OF USING THE SAME - A personnel monitoring system. The personnel monitoring system includes a host node having an optical source for generating optical signals, and an optical receiver. The personnel monitoring system also includes a plurality of fiber optic sensors for converting at least one of vibrational and acoustical energy to optical intensity information, each of the fiber optic sensors having: (1) at least one length of optical fiber configured to sense at least one of vibrational and acoustical energy; (2) a reflector at an end of the at least one length of optical fiber; and (3) a field node for receiving optical signals from the host node, the field node transmitting optical signals along the at least one length of optical fiber, receiving optical signals back from the at least one length of optical fiber, and transmitting optical signals to the optical receiver of the host node. | 02-07-2013 |
| 20130039648 | SEMICONDUCTOR DEVICE, METHOD FOR TESTING SAME AND TRANSMITTING CIRCUIT - According to an embodiment, a semiconductor device includes an analog/digital conversion unit, a pulse width modulation unit outputting a transmission signal, the transmission signal being a pulse pattern corresponding to a digital signal output from the analog/digital conversion unit, a reference signal generation unit generating a reference signal, the reference signal being a fixed pulse pattern. The device includes a first control unit selecting one of the transmission signal and the reference signal, a light emitting element drive unit outputting a drive current based on the transmission signal or the reference signal, a light emitting element driven by the light emitting element drive unit. The device includes an optical receiving unit converting the optical signal into a voltage signal, and a demodulation unit demodulating the voltage signal into a digital signal based on the transmission signal or the reference signal. | 02-14-2013 |
| 20130039649 | OPTICAL SIGNAL CUTOFF DETECTION CIRCUIT AND OPTICAL RECEIVER - A comparator ( | 02-14-2013 |
| 20130045003 | DETECTING THE PRESENCE OF STIMULATED BRILLOUIN SCATTERING IN A FIBER OF A COMMUNICATION SYSTEM - Methods and apparatuses are provided to determine whether SBS is present in a fiber of a communication system. An SBS detector comprising a circulator and a detector is used to determine whether SBS is occurring in a fiber. An input optical signal can be received at a first port of the circulator and output at a second port of the circulator where the fiber is connected. The circulator can receive a reflected optical signal from the fiber at the second port of the circulator and output the reflected optical signal at the third port. A detector connected to third port of the circulator receives the reflected optical signal and converts the reflected optical signal to a D.C. voltage. | 02-21-2013 |
| 20130045004 | Histogram-Based Chromatic Dispersion Estimation - Techniques are provided for estimation of the chromatic dispersion (CD) in an optical signal received by an optical receiver. The techniques involve iteratively adjusting dispersion compensation coefficients of one or more filters configured to compensate for the CD in the received optical signal. At each iteration of the dispersion compensation coefficient adjustment, electrical domain signals are filtered to generate digitally-filtered signals. The electrical domain signals are generated based on the received optical signal. Also at each iteration of the dispersion compensation coefficient adjustment, an amplitude histogram of the digitally-filtered signals is generated. The amplitude histograms generated at each iteration are evaluated to generate an estimate of the chromatic dispersion in the received optical signal. | 02-21-2013 |
| 20130045005 | COMMUNICATION METHOD FOR OPTICAL COMMUNICATION SYSTEM, OPTICAL COMMUNICATION SYSTEM, SLAVE STATION APPARATUS, CONTROL DEVICE, AND COMPUTER PROGRAM - The control device includes a power-saving control unit that intermittently repeats, based on a power saving permission signal transmitted from the master station apparatus, power saving control in which the slave station stops or reduces power supply to a transmitter or a receiver for a predetermined pause duration while maintaining a communication link and a monitoring unit that monitors out of synchronization by comparing a synchronization signal received from the OLT and a time of the ONU. The control device shifts from a registered state to a deregistered state when the monitoring unit detects the out of synchronization. On the other hand, after the pause duration of the power saving control, the control device suppresses the shift to the deregistered state due to the detection of the out of synchronization. | 02-21-2013 |
| 20130051793 | OPTICAL SIGNAL MONITORING METHOD AND APPARATUS - A method of monitoring a differential group delay, DGD, of an optical communications signal having a polarisation multiplexed modulation format is described. The method includes the steps of receiving a signal and performing analogue to digital conversion of the signal to generate a digitised signal corresponding to one polarisation of the signal and to generate another digitised signal corresponding to another polarisation of the signal, and applying a polarisation mode dispersion, PMD, compensation to each of the digitised signals. The method further includes the steps of obtaining an indication of the channel transfer function of the optical communications signal, determining a DGD in dependence on the indication of the channel transfer function, determining a delay between the PMD compensated digitised signals, subtracting the delay from the DGD to obtain a corrected DGD, and generating and transmitting a monitoring signal with an indication of the corrected DGD. | 02-28-2013 |
| 20130051794 | METHOD FOR ACQUIRING OPTICAL FIBER CONNECTION RELATION, NODE DEVICE, AND OPTICAL NETWORK SYSTEM - A method for acquiring an optical fiber connection relation includes: acquiring, by a first unit, first port identification information of a optical fiber, where the first port identification information of the optical fiber is pre-stored in a first storage unit; correlating port identification information of the first unit that is connected to the first storage unit with the first port identification information; acquiring, by a second unit, second port identification information of the optical fiber, where the second port identification information of the optical fiber is pre-stored in a second storage unit; correlating port identification information of the second unit that is connected to the second storage unit with the second port identification information; acquiring, by a management control unit, correlation information; and determining an optical fiber connection relation between the first unit and the second unit. | 02-28-2013 |
| 20130058642 | METHOD AND SYSTEM FOR CONSERVING POWER IN AN OPTICAL NETWORK - In accordance with the present disclosure, a method for conserving power in an optical network comprises determining a signal transmission capability of a first network element optically coupled to a second network element over an optical network. The first network element is configured to transmit an optical signal to the second network element over a path associated with the optical network. The method further comprises determining a transmission requirement of the path between the first and second network elements and determining a difference between the transmission capability and the transmission requirement. Additionally, the method comprises changing at least one of error correction and modulation associated with the optical signal transmitted based on the difference between the transmission capability and the transmission requirement, to reduce power consumption of at least one of the first network element and the second network element. | 03-07-2013 |
| 20130058643 | DATA AMOUNT DERIVATION APPARATUS - A data amount derivation apparatus includes: a first calculator configured to derive, for one series of parallelized mapping signals, amount of data in each frame period for a frame into which the parallelized mapping signals are mapped; and a second calculator configured to sum up amounts of data in N frame periods, where N is an integer, and to derive the resulting summation value as the amount of data to be mapped into the frame, each of the amounts of data in each of the frame periods being derived by the first calculator. | 03-07-2013 |
| 20130064540 | DEVICE TO DETERMINE A PHASE DIFFERENCE OF IN-PHASE AND QUADRATURE COMPONENT OF SIGNAL LIGHT, AND A METHOD TO DETERMINE THE PHASE DIFFERENCE - A device able to evaluate a phase difference between I-component and Q-component of signal light generated by an optical hybrid is disclosed. The device includes a detector, a compensator and an evaluator. The detector detects positive and negative elements of each of the I-component and the Q-component. The compensator generates a compensated I-component and a compensated Q-component so as to keep the sum of positive and negative elements of each of components in constant. The evaluator determines the phase difference via an ellipsoid drawn by the compensated I- and Q-components. | 03-14-2013 |
| 20130064541 | METHOD AND ARRANGEMENT FOR STABILIZING A COLOUR CODING METHOD FOR OPTICAL TRANSMISSION OF DATA - A method for optically transmitting data between a transmitter and a receiver is disclosed, in which a colour coding method based on a plurality of elemental colours is provided for the coding and transmission of the data, which colour coding method involves a respective elemental colour being sent by a respective transmitter-end optical radiation source and being received at the receiver end by a respective optical radiation receiver. The method provides for a control loop to be formed between the transmitter and the receiver, wherein the transmitter sends calibration messages to the receiver, and wherein a piece of compensation information is ascertained by comparing at least one channel property of at least one received calibration message with a corresponding channel property of at least one previously sent calibration message, and wherein the transmitter takes the compensation information as a basis for adjusting at least one transmission parameter. | 03-14-2013 |
| 20130071105 | High Speed Multi-Mode Fiber Transmissions via Orthogonal Wavefronts - A system is provided for high speed optical fiber data transmission by generating artificial wavefronts along multiple paths exhibiting spatial mutual orthogonality. Multiple independent signal streams are “structured” over a group of different propagation paths that are coherently organized by wavefront multiplexing and de-multiplexing techniques. Therefore, signal streams with enhanced throughput and reliability may be fully recovered at destinations via embedded diagnostic signals and optimization loops. Multiple optical channels are matched with multiple orthogonal wavefronts created by a signal pre-processor. A receiving end signal post-processor dynamically aligns propagation paths via diagnostic signals and orthogonality of the propagation wavefronts electronically. The multiple optical channels are coherently bonded into a single virtual channel, thereby increasing data bandwidth while reducing interference and unwanted multi-path effects. The wavefront multiplexing and de-multiplexing functions may be performed in a dedicated signal processor or may reside in a general-purpose microprocessor located in the user terminal. | 03-21-2013 |
| 20130071106 | OPTICAL RECEIVER - In an optical receiver, a light receiving element receives the optical packet signals and converts the optical packet signals to electrical signals. A bias voltage supply section supplies bias voltage to the light receiving element. A monitoring section monitors an input level of each optical packet signal or each electrical signal and transmits a monitored value to the bias voltage supply section. In addition, the bias voltage supply section temporarily increases the bias voltage according to magnitude of the monitored value after an end of receiving of each optical packet signal. | 03-21-2013 |
| 20130071107 | TRANSMITTER FOR WIRELESS OPTICAL COMMUNICATION SYSTEM USING LIGHT SOURCE - A transmission apparatus of a wireless light communication system using an illumination light source can maximize a rate of data transmission while maintaining a brightness adjusting function of the illumination light source. The transmission apparatus includes a dimming level input unit which receives a dimming level of the illumination light source as an input, a coder which codes original data and outputs the coded data, a dimming coder which checks the dimming level input to the dimming level input unit, generates a symbol-codeword table corresponding to the dimming level, and dimming-codes the data output from the coder, a line coder which converts the data diming-coded by the dimming coder into pulse signals. | 03-21-2013 |
| 20130077962 | METHODS AND SYSTEMS FOR BLOCK ALIGNMENT IN A COMMUNICATION SYSTEM - A method may include receiving a stream of datagrams, the datagrams having a first bit length. The method may also include selecting a block of bits from consecutively-received datagrams, the block having a second bit length greater than the first bit length. The method may additionally include determining whether a particular data field is present at a particular bit position within the block. The method may further include outputting the block as a valid block in response to determining that the particular data field is present at the particular bit position. The method may additionally include, in response to determining that the particular data field is not present at the particular bit position: discarding a received datagram from the stream of datagrams; and repeating the receiving, selecting, determining, and discarding steps until a determination is made that the particular data field is present at the particular bit position. | 03-28-2013 |
| 20130089322 | Method And Apparatus For Changing A Mode In An Optical Network - A method at a transmitter of a tunable laser of controlling a mode change of the laser during a transmission of data to a receiver of a terminating node is based on the determination of a time instance for initiation of the mode change on the basis of the state of the tunable laser. In addition, buffer occupancy and/or the state of the data transmission may be considered when determining such a time instance for instance. In addition, data of the data transmission is buffered during the mode change, such that data loss is avoided during the change of mode. A transmitter is also provided which can execute the suggested mode changing method. | 04-11-2013 |
| 20130094850 | OPTICAL SIGNAL TRANSMITTING APPARATUS - There is provided an optical signal transmitting apparatus included in an optical communication system which performs communication by transmission and reception of an optical signal indicating digital data. The optical signal transmitting apparatus includes a transmission data generating unit configured to set a data length of each frame constituting the optical signal based on a frequency tolerance of a clock signal on a transmission side and a reception side, and generate digital transmission data having multiple consecutive frames of same contents, each frame having the set data length; and a light emission driving unit configured to drive a light emitting unit to output the optical signal indicating the digital transmission data. | 04-18-2013 |
| 20130094851 | Optical Spectral Shaping for Nonlinearity Enhancement in High Speed Digital Coherent Optical Transmissions - A method includes evaluating an optical signal spectrum for estimated filtering parameters of an optical spectral filtering device for shaping optical signal spectrum, determining a feedback for fine tuning the optical spectral filtering device for nonlinearity tolerance enhancement in the optical transmission system, responsive to received optical signal quality in the optical signal spectrum; and using the feedback to adjust said optical spectral filtering device for predetermined shaping and predetermined fiber nonlinearity tolerance in the optical transmission system. | 04-18-2013 |
| 20130094852 | FREQUENCY OFFSET MONITORING DEVICE AND OPTICAL COHERENT RECEIVER - The present invention provides a frequency offset monitoring device and an optical coherent receiver. A low speed frequency offset monitoring device comprises a signal speed lowering section, for lowering the speed of an inputted signal and outputting the speed lowered signal, and a frequency offset monitor, for monitoring frequency offset of the speed lowered signal outputted by the signal speed lowering section. | 04-18-2013 |
| 20130108259 | AFFINITY MODELING IN A DATA CENTER NETWORK | 05-02-2013 |
| 20130108260 | METHOD AND APPARATUS FOR ADAPTIVE NONLINEAR EQUALIZATION IN A POLARIZATION MULTIPLEXING OPTICAL COMMUNICATION SYSTEM | 05-02-2013 |
| 20130114956 | DPSK OPTICAL RECEIVER - Disclosed is a DPSK optical receiver capable of compensating for a polarization phase difference. The DPSK optical receiver according to an embodiment of the present disclosure includes: an optical splitter configured to split a received optical signal into a first optical signal and a second optical signal; an optical delay waveguide configured to delay the first optical signal; a birefringent waveguide configured to delay the second optical signal so as to compensate for a polarization phase difference at an output end; and an optical hybrid configured to generate an optical detection signal corresponding to a phase difference between the delayed first optical signal and the delayed second optical signal. | 05-09-2013 |
| 20130121687 | ARRANGEMENT FOR GENERATING A SIGNAL HAVING AN ADJUSTABLE TIME POSITION OR PHASE POSITION - The invention relates to a system for producing a signal having a variably adjustable time position or phase position, comprising at least one light source for producing a first light component ( | 05-16-2013 |
| 20130121688 | OPTICAL TRANSMITTER AND OPTICAL TRANSMISSION METHOD - An optical transmitter includes a plurality of VCSELs (vertical cavity surface emitting laser) that convert an electrical signal into an optical signal and transmit the converted optical signal. The optical transmitter measures a time for each of the VCSELs of transmitting an optical signal. Then, the optical transmitter assigns an electrical signal, indicating information to be transmitted, to one or more VCSELs, out of the VCSELs, other than a VCSEL of which a cumulative time measured is more than a predetermined threshold. | 05-16-2013 |
| 20130129345 | OPTICAL TRANSPORT NETWORK SYNCHRONIZATION AND TIMESTAMPING SYSTEMS AND METHODS - The present disclosure provides to Optical Transport Network (OTN_ synchronization systems and methods that maintain proper sequential ordering of events at nodes which may be utilized in performing root cause analysis or diagnosing network performance. In an exemplary embodiment, the systems and methods utilize functionality incorporated into OTN providing a cost effective and standards-based approach to nodal synchronization. Once synchronized, network events are logged with an appropriate timestamp enabling a determination of a sequential order of network events can be determined. Further, the node timestamps may be synchronized, with microsecond or even sub-microsecond of precession which is critical in diagnosing network failures or slow traffic recovery. | 05-23-2013 |
| 20130129346 | TRANSPORTING DATA AND AUXILIARY SIGNALS OVER AN OPTICAL LINK - A data transport system for transporting data and auxiliary signals over an optical link comprises a transmitter, a receiver and an optical link. The transmitter and receiver are coupled to a first end of the optical link. The optical link includes a number of optical channels. A controller is coupled to the transmitter and the receiver, and controls the transmitter and the receiver to operate in a first state when data are detected at an input of the transmitter. Data are transported via the data transport system in the first state. The controller controls the transmitter and the receiver to operate in a second state when the data are detected as absent at the input of the transmitter. Data are prevented from being transported via the data transport system in the second state. | 05-23-2013 |
| 20130129347 | APPARATUS AND METHOD FOR MEASURING A DELAY - An apparatus and method for measuring a delay. The apparatus for measuring a delay includes an overhead inserting unit configured to inserting a time stamp into an overhead of a multiframe to be transmitted from a first location to a second location; an overhead extracting unit configured to extract a time stamp from an overhead of a multiframe received from the second location, the time stamp including bypass delay information of the second location; and a delay measuring unit configured to measure a round trip delay between the first location and the second location using the inserted time stamp and the extracted time stamp and adjust the measured round trip delay using the extracted bypass delay information. | 05-23-2013 |
| 20130142507 | PDL COMPENSATOR OPTICAL DEVICE, AND PDL COMPENSATION METHOD - A PDL compensation technique is provided that reduces the number of and the number of types of the PDL compensators even if it is uncertain to determine which of the two polarization principal axes of an optical device has a larger loss. The PDL compensator according to the present invention is configured to, before an optical signal input from a first or a second input/output terminal enters a PDL compensation device, switch between the first polarization principal axis and the second polarization principal axis of the optical signal depending on which of the first and the second polarization principal axes has a larger loss or gain. | 06-06-2013 |
| 20130148960 | MODULAR KIT OF DEVICES FOR VARIABLE DISTRIBUTION, MIXING AND MONITORING OF OPTICAL SIGNALS IN THE INTERNET AND OTHER NETWORKS - Modular kit of devices for variable distribution, mixing and monitoring of optical signals in the Internet and other networks is formed by an optical module interconnected with a control electronic module of the electronic system with two redundant power supply sources, which is subsequently interconnected with the communication computer module equipped with the user communication interface and the machine communication interface. Optical module has N optical inputs and M optical outputs where N and M are non-zero natural numbers, and in total the optical module contains N×M of 2×2 type Mach-Zender interferometer optical switching elements. Each of them has two optical inputs, two optical outputs and one electric input. Optical switching elements are mutually interconnected in a grid. Control electronic module is formed by N×M pulse-width modulators connected via an interface module to the communication computer module and to the power supply distribution block. | 06-13-2013 |
| 20130156418 | CHIP ON FLEX OPTICAL SUBASSEMBLY - One example embodiment includes an optical subassembly (OSA). The OSA includes a flex circuit, an optical port, and an active optical component subassembly. The flex circuit is constructed of at least one electrically-conductive layer and at least one electrical insulator layer. The optical port defines a barrel cavity and is mechanically coupled to the flex circuit at a flex connection. The active optical component subassembly is positioned within the barrel cavity and electrically coupled to the flex circuit. | 06-20-2013 |
| 20130156419 | OPTICAL DATA TRANSMISSION DEVICE, OPTICAL COMMUNICATION DEVICE, AND AUTOMATIC CONVEYANCE DEVICE - Reliable data transmission is secured without inviting large design changes by means of configuring an optical data transmission device in a manner so as to be provided with: data conversion units and optical communication control units that transmit to each of a first communication unit and a second communication unit disposed movably relative to one another an optical signal modulated in response to wired-line data input from a wired line, and that output wired-line data demodulated from the received optical signal to the wired line; a bit data input unit that receives input of bit data for emergency stops; a bit data output unit that outputs bit data for emergency stops; and bit data communication control units that control in a manner so as to transmit/receive input bit data via the optical communication control units using optical signals that are isolated from the optical signal corresponding to the wired-line data. | 06-20-2013 |
| 20130163986 | ELECTRICALLY-ADAPTIVE DSPK AND (D)MPSK RECEIVERS - The present application describes methods and systems that improve the optical signal to noise ratio performance of an optical network without the need to vary the free spectral range associated with a differential interferometer. This is achieved by varying an electrical bandwidth of an electronic device associated with the receiver. For example, the electrical bandwidth may vary in inverse proportion to the combined effective optical bandwidth of the transmission line carrying the optical signal. The techniques described herein a applicable to a wide variety of modulation formats, including mPSK, DPSK, DmPSK, PDmPSK, mQAM, ODB, and other direct-detection formats. Using the techniques described herein, the optical signal to noise ratio and bit error ratio performance of the optical network is improved without the need to provide costly and complex differential interferometers whose free spectral range is variable. | 06-27-2013 |
| 20130170827 | COMMUNICATIONS SYSTEM - There is provided a communications system ( | 07-04-2013 |
| 20130177308 | Operational State Information Generation in an Optical Transceiver - Methods, algorithms, architectures, circuits, and/or systems for determining the status of parameters associated with optical transceiver operation are disclosed. The method can include (a) accessing and/or monitoring parametric data for each of a plurality of parameters that are related to operation of the optical transceiver; (b) storing the parametric data in one or more memories; (c) comparing the parametric data for each of the plurality of parameters against at least one of a corresponding plurality of predetermined thresholds; and (d) generating one or more states indicating whether the parametric data for a unique one of the parameters has crossed one or more of the corresponding plurality of predetermined thresholds. The invention also relates to an optical triplexer, comprising the described optical transceiver. | 07-11-2013 |
| 20130177309 | 40G/100G MSA-COMPLIANT OPTICAL TRANSCEIVERS WITH ADVANCED FUNCTIONALITY - Integrated performance monitoring (PM); optical layer operations, administration, maintenance, and provisioning (OAM&P); alarming; amplification, and the like is described in optical transceivers, such as multi-source agreement (MSA)-defined modules. An optical transceiver defined by an MSA agreement can include advanced integrated functions for carrier-grade operation which preserves the existing MSA specifications allowing the optical transceiver to operate with any compliant MSA host device with advanced features and functionality. The optical transceiver can include CFP and variants thereof (e.g., CFP2, CDFP, CXP), OIF-MSA-100GLH-EM-01.0, CCRx (Compact Coherent Receiver), Quad Small Form-factor Pluggable (QSFP) and variants thereof (e.g., QSFP+, QSFP2), 10X10 MSA, XFP, XPAK, XENPAK, X2, XFP-E, SFP, SFP+, 300-pin, and the like. | 07-11-2013 |
| 20130177310 | PROCESS METHOD AND APPARATUS FOR PREVENTING ALARM JITTER - The disclosure provides a process method and apparatus for preventing an alarm jitter, which are applied to an ASON system. The method comprises: obtaining a time interval weight T between generation and recovery of an alarm of a device through a pretest (S | 07-11-2013 |
| 20130183030 | SYSTEM FOR TESTING OF OPTICAL NETWORK - A network comprising: (a) a fiber having first and second ends; (b) a transmitter connected to the first end of the fiber and configured to launch a test signal having a first wavelength down the fiber; and (c) a thin-film selective reflector configured to reflect the first wavelength, the thin-film selective reflector optically connected to the second end of the first fiber. | 07-18-2013 |
| 20130183031 | DATA TRANSMISSION DEVICE, DATA TRANSMISSION METHOD, AND DATA TRANSMISSION DEVICE CONTROL PROGRAM - A data transmission device may include: a transmitter unit; a receiver unit; an optical transmission path that connects the transmitter unit to the receiver unit and transmits an optical signal; and an electrical transmission path that connects the transmitter unit to the receiver unit and transmits an electrical signal. The transmitter unit may include: a light source unit that converts an input electrical signal from an exterior into an optical signal, and outputs the optical signal to the optical transmission path; and a transmitter-side control unit that outputs information on a physical quantity having a relation to intensity of the optical signal, which is output from the light source unit, to the electrical transmission path. The receiver unit may include: a light detecting unit that receives the optical signal transmitted through the optical transmission path and converts the optical signal into an electrical signal; and a receiver-side control unit. | 07-18-2013 |
| 20130195442 | TRANSMISSION DEVICE AND METHOD FOR MEASURING DELAY - A transmission device transmits a frame to a correspondent device and receives a frame from the correspondent device. The transmission device includes: a measurement unit configured to perform a delay measurement that measures a period of time from when a frame is transmitted to the correspondent device until when a corresponding frame is received from the correspondent device; and a delay decision unit configured to determine a transmission delay between the transmission device and the correspondent device based on a plurality of target measurement results obtained from a plurality of delay measurements except for at least a first delay measurement among delay measurements performed by the measurement unit. | 08-01-2013 |
| 20130195443 | TIME SYNCHRONIZATION METHOD, DEVICE, AND SYSTEM - The present disclosure provides a time synchronization method, including: acquiring, by a slave device, a first optical fiber transmission delay from a master device to the slave device, and a second optical fiber transmission delay from the slave device to the master device; exchanging a time synchronization signal with the master device, and calculating an initial time offset; adjusting the initial time offset by using the first optical fiber transmission delay and the second optical fiber transmission delay to obtain a corrected time offset; and adjusting a local clock according to the corrected time offset. Embodiments of the present disclosure further provide a corresponding device and system. | 08-01-2013 |
| 20130209088 | Operational Status Indicators in an Optical Transceiver Using Dynamic Thresholds - Methods, architectures, circuits, and/or systems for monitoring operating parameters and/or generating status indications associated with electronic device operation are disclosed. The method can include (i) monitoring a first operating parameter related to operation of the electronic device to determine a first parameter value, (ii) calculating a difference between the first parameter value and a predetermined value for the first operating parameter, (iii) monitoring a second operating parameter on which thresholds for operational warnings and/or alarms are based to determine a second parameter value, (iv) updating or changing the thresholds based on a predetermined change or event in the second parameter value, (v) comparing the difference to the updated or changed thresholds, and (vi) generating a corresponding one of the operational warnings and/or alarms when the difference crosses at least one of the thresholds in a predetermined direction. | 08-15-2013 |
| 20130209089 | CONSTRAINED CONTINUOUS PHASE MODULATION AND DEMODULATION IN AN OPTICAL COMMUNICATIONS SYSTEM - A transmitter in an optical communications system includes a digital signal processor for processing a data signal to generate a sample stream encoding successive symbols in accordance with a constrained phase modulation scheme having a constellation of at least two symbols and a modulation phase constrained to a phase range spanning less than 4π. A digital-to-analog converter converts the sample stream into a corresponding analog drive signal. A finite range phase modulator modulates a phase of a continuous wavelength channel light in accordance with the analog drive signal, to generate a modulated channel light for transmission through the optical communications system. A receiver in the optical communications system includes an optical stage for detecting phase and amplitude of the modulated channel light and for generating a corresponding sample stream, and a digital signal processor for processing the sample stream to estimate each successive symbol of the modulated channel light. | 08-15-2013 |
| 20130209090 | Operational Status Indicators in an Optical Transceiver Using Dynamic Thresholds - Methods, architectures, circuits, and/or systems for monitoring operating parameters and/or generating status indications associated with electronic device operation are disclosed. The method can include (i) monitoring a first operating parameter related to operation of the electronic device to determine a first parameter value, (ii) calculating a difference between the first parameter value and a predetermined value for the first operating parameter, (iii) monitoring a second operating parameter on which thresholds for operational warnings and/or alarms are based to determine a second parameter value, (iv) updating or changing the thresholds based on a predetermined change or event in the second parameter value, (v) comparing the difference to the updated or changed thresholds, and (vi) generating a corresponding one of the operational warnings and/or alarms when the difference crosses at least one of the thresholds in a predetermined direction. | 08-15-2013 |
| 20130216218 | METHOD AND DEVICE FOR COMPENSATING FOR TIME PATH - Embodiments of the present disclosure relate to a method and a device for compensating for a time path. In the embodiments of the present disclosure, on the basis of not changing implemented 1588 synchronization architecture, a compensation unit is added on a service board unit, the compensation unit calculates a compensation time value for asymmetrical reception and transmission of fiber links and transfers the compensation time value into the service board unit, and the service board unit implements automatic compensation according to a port status. The method and the device for compensating for a time path according to the embodiments of the present disclosure may implement automatic compensation for receiving and sending fiber links without manually testing the asymmetry of links node by node, so that the embodiments of the present disclosure can be widely applied in time synchronization networks. | 08-22-2013 |
| 20130230312 | CORRECTION OF A LOCAL-OSCILLATOR PHASE ERROR IN A COHERENT OPTICAL RECEIVER - In a representative embodiment, a disclosed receiver of an optical multicarrier offset-quadrature-amplitude-modulated (MC-OQAM) signal is configured to track and compensate for the phase error in the local-oscillator (LO) signal with respect to a carrier wave of a modulated subcarrier of the optical MC-OQAM signal by tracking a minimum of a cost function that is sensitive to crosstalk between in-phase and quadrature components of the modulated subcarrier and/or crosstalk between the modulated subcarrier and at least one other modulated subcarrier of the optical MC-OQAM signal. The receiver can operate based on pure feed-forward processing and compensate the phase error in real time and without relying on pilot symbols or a PLL circuit coupled to the LO source. | 09-05-2013 |
| 20130230313 | METHOD AND APPARATUS FOR COMPENSATING NONLINEAR DAMAGE - The embodiments relate to a method and an apparatus for compensating nonlinear damage. The method and apparatus being used in a dual-polarization communication system, the method comprising: calculating, according to input time-domain signals, a plurality of multiplicative parameters indicative of nonlinear damages to the input signals; constructing a plurality of multiplicators by using the plurality of multiplicative parameters; and compensating the input time-domain signals by using the plurality of multiplicators. | 09-05-2013 |
| 20130230314 | METHOD FOR CONTROLLING OPTICAL POWER AND EXTINCTION RATIO OVER ENTIRE TEMPERATURE RANGE - The present invention is to provide a method applicable to a fiber-optic transceiver including a transmitter optical subassembly (TOSA) provided therein with a laser diode, but without a monitoring photodiode, a laser driver controlled by a controller IC for driving the laser diode to generate a laser beam, and a thermal sensor for sensing temperature of the laser diode. The method includes executing an approximation process to characteristic data, i.e. threshold currents of the laser diode at a plurality of specific temperatures and corresponding slope efficiencies (SE), provided by manufacturer for obtaining relationship therebetween over entire temperature range, manually adjusting operation parameters (such as bias current and modulation current) of the laser diode for generating expected optical power and extinction ratio at a normal temperature and for subsequently determining the operation parameters over the entire temperature range, and writing the relationship and operation parameters thus obtained into the controller IC. | 09-05-2013 |
| 20130230315 | EXCHANGE DEVICE - The exchange device groups PON branches into PON branch groups based on the amount of communication data traffic that has arrived via a communication network with a plurality of optical network units (ONUs) respectively belonging to one of a plurality of PON branches as a transmission destination, multiplexes the communication data for each PON group, and transmits the multiplexed data. The exchange device has an unit configured to transmit each piece of communication data from the ONUs to one output port selected from among a plurality of output ports based on the transmission wavelength of the communication data. The exchange device groups a plurality of PON branches into PON branch groups based on the required bandwidth of each of the ONUs, and designates the transmission wavelength for each of the ONUs so that each piece of the communication data from one PON branch group is transmitted to one port. | 09-05-2013 |
| 20130236169 | COHERENT PROBE AND OPTICAL SERVICE CHANNEL SYSTEMS AND METHODS FOR OPTICAL NETWORKS - The present disclosure provides dynamic performance monitoring systems and methods for optical networks to ascertain optical network health in a flexible and accurate manner. The present invention introduces accurate estimations for optical channel performance characteristics based either on existing channels or with a dynamic optical probe configured to measure characteristics on unequipped wavelengths. Advantageously, the dynamic performance monitoring systems and methods introduce the ability to determine physical layer viability in addition to logical layer viability. | 09-12-2013 |
| 20130236170 | COMMUNICATION APPARATUS - The present invention provides a communication apparatus on a subscriber side that, in a point to multi-point communication system, transmits upstream data transmitted from a lower-level device to a station-side device based on a data transmission start time and a transmission duration time notified from the station-side device. The communication apparatus includes a logical-link control unit that determines number of links to be used, which is number of logical links to be used for an upstream data transmission in a next bandwidth update cycle, based on an accumulated data amount in an upstream buffer unit that accumulates upstream data to be transmitted to the station-side device. | 09-12-2013 |
| 20130243420 | Method and Apparatus of Using Joint Timing Recovery for a Coherent Optical System - An apparatus and method for performing joint equalization and timing recovery in coherent optical systems. The method includes equalizing signals to generate compensated polarization signals, wherein timing error in a distorted optical signal is calculated based on one of the compensated polarization signals. The method further includes performing resampling polarization signals to correct timing offset in an optical signal based on the calculated timing error. The calculated timing error may also be used to adaptively control one or more operating parameters of an external device. | 09-19-2013 |
| 20130243421 | MEASUREMENT APPARATUS, NETWORK DESIGN APPARATUS, TRANSMISSION SYSTEM, AND NETWORK MANAGEMENT APPARATUS - A measurement apparatus includes: a transmitter disposed at a transmission-side node and configured to transmit two pulsed lights with different wavelengths at time intervals to a reception-side node; a transmission controller configured to control the transmitter so as to transmit the two pulsed lights repeatedly while changing the time interval; a receiving unit disposed at the reception-side node and configured to receive the two pulsed lights from the transmitter via one or more relay nodes; a detection unit configured to detect a change in a phase of at least one of the two pulsed lights received by the receiving unit; and a measurement unit configured to measure, based on the time interval and the change in a phase detected by the detection unit, a dispersion value of each transmission line between two nodes of nodes including the transmission-side node, the reception-side node, and the one or more relay nodes. | 09-19-2013 |
| 20130243422 | METHOD FOR ESTIMATING A CHROMATIC DISPERSION OF A RECEIVED OPTICAL SIGNAL - The present disclosure relates to a method for estimating chromatic dispersion of a received optical signal (R | 09-19-2013 |
| 20130251362 | Performance Monitoring in Passive Optical Networks - One embodiment provides a system for performance monitoring in a passive optic network (PON). The system includes an optical line terminal (OLT) and an optical network unit (ONU). The OLT includes an optical transceiver configured to transmit optical signals to and receive optical signals from the ONU, and a performance monitoring mechanism configured to monitor performance of the PON based on received optical signals. | 09-26-2013 |
| 20130266310 | INTELLIGENT NODE FOR IMPROVING SIGNAL QUALITY IN A CABLE MODEM NETWORK - Systems and methods are provided for improving the signal quality and performance in a cable operator's Hybrid Fiber Coax (HFC) plant by adding DOCSIS intelligence to components within the HFC plant. These intelligent DOCSIS devices, referred to here as DOCSIS Intelligent Nodes (DINs), intercept the upstream signal from cable modems and set top boxes, and perform various types of signal processing on the signals based upon knowledge of the signal characteristics obtained from CMTS control structures such as MAPs and Upstream Channel Descriptors (UCDs). The DIN functionality can be integrated into any type of device found in HFC networks such as RF amplifiers and fiber nodes. | 10-10-2013 |
| 20130272695 | Curved Grating Spectrometer and Wavelength Multiplexer or Demultiplexer with Very High Wavelength Resolution - The present application discloses a system comprising a compact curved grating (CCG) and its associated compact curved grating spectrometer (CCGS) or compact curved grating wavelength multiplexer/demultiplexer (WMDM) module and a method for making the same. The system is capable of achieving a very small (resolution vs. size) RS factor. In the invention, the location of the entrance slit and detector can be adjusted in order to have the best performance for a particular design goal. The initial groove spacing is calculated using a prescribed formula dependent on operation wavelength. The location of the grooves is calculated based on two conditions. The first one being that the path-difference between adjacent grooves should be an integral multiple of the wavelength in the medium to achieve aberration-free grating focusing at the detector or output slit (or output waveguide) even with large beam diffraction angle from the entrance slit or input slit (or input waveguide). The second one being specific for a particular design goal of a curved-grating spectrometer. In an embodiment, elliptical mirrors each with focal points at the slit and detector are used for each groove to obtain aberration-free curved mirrors. | 10-17-2013 |
| 20130272696 | OPTICAL FIBER-BASED DISTRIBUTED ANTENNA SYSTEMS, COMPONENTS, AND RELATED METHODS FOR CALIBRATION THEREOF - Optical fiber-based wireless systems and related components and methods are disclosed. The systems support radio frequency (RF) communications with clients over optical fiber, including Radio-over-Fiber (RoF) communications. The systems may be provided as part of an indoor distributed antenna system (IDAS) to provide wireless communication services to clients inside a building or other facility. The communications can be distributed between a head end unit (HEU) that receives carrier signals from one or more service or carrier providers and converts the signals to RoF signals for distribution over optical fibers to end points, which may be remote antenna units (RAUs). In one embodiment, calibration of communication downlinks and communication uplinks is performed to compensate for signal strength losses in the system. | 10-17-2013 |
| 20130279903 | Noise Discriminator for Enhanced Noise Detection In A Passive Optical Network Burst Mode Receiver - A noise discriminator circuit and a noise discrimination method in a burst mode receiver is configured to determine the validity of an incoming burst signal by analyzing the timing of the signal edges of incoming signal to look for a time duration conforming to the preamble data bits of a valid burst signal. In one embodiment, the noise discriminator circuit and method analyze the time duration between signal edges of the same pulse of an incoming signal. In another embodiment, the noise discriminator circuit and method analyze the time duration between a first set of pulses of an incoming signal and the time duration between signal edges of a second set of pulses of the incoming signal. When the time durations are within a given time range relating to a predetermined timing separation of a valid burst signal, the incoming signal is validated as a valid burst signal. | 10-24-2013 |
| 20130279904 | Method and System for Automatically Discovering ODUflex Bandwidth Lossless Adjustment Capability - A method and system for automatically discovering a flexible rate Optical Data Unit (ODUflex) bandwidth hitless resizing capability are provided in the present document. The method includes: a source end interface of a link sending link summary message to an opposite end interface of the link, wherein the link summary message carries information of whether the source end interface of the link supports the ODUflex bandwidth hitless resizing capability; after receiving the link summary message, the opposite end interface of the link feeding back message to the source end interface of the link according to said information or according to said information and whether the opposite end interface of the link supports the ODUflex bandwidth hitless resizing capability, the source end interface of the link determining whether the link supports the ODUflex bandwidth hitless resizing capability according to the message fed back by the opposite end interface of the link. | 10-24-2013 |
| 20130294764 | WAVELENGTH SENSING LIGHTING SYSTEM AND ASSOCIATED METHODS FOR NATIONAL SECURITY APPLICATION - A wavelength sensing lighting system may include a light source, a sensor and a controller. One or more light sources and sensors may be included in an array. The light source may emit an illuminating light and the sensor may sense an environmental light. The illuminating light may include data light. The lighting system may include a plurality of nodes connected in a network. The nodes may communicate by emitting and receiving the data light, which may be analyzed by the controller. The light source and the sensor may be provided by a light emitting semiconductor device that is capable of emitting illuminating light and receiving environmental light. A conversion material may convert the wavelength of a source light into a converted light. The conversion material may increase the wavelength range of light emittable and detectable by the lighting system. | 11-07-2013 |
| 20130294765 | POLARIZATION MULTIPLEXING OPTICAL RECEIVING DEVICE AND POLARIZATION MULTIPLEXING OPTICAL RECEIVING METHOD - Provided are a polarization multiplexing optical receiving device and a polarization multiplexing optical receiving method with which a mismatch of optical intensity between polarized signals accumulated in an optical transmission path of an optical receiving system can be compensated with high precision, and a high-quality polarized optical signal can be received. | 11-07-2013 |
| 20130302028 | Optical Subchannel Routing, Protection Switching and Security - The present invention includes novel techniques, apparatus, and systems for optical WDM communications. Tunable lasers are employed to generate subcarrier frequencies representing subchannels of an ITU channel to which client signals can be mapped. Client circuits can be divided and combined before being mapped, independent of one another, to individual subchannels within and across ITU channels. Subchannels may be independently routed to a single subchannel receiver filter, such that each subchannel detected at the receiver may come from a different source location. Network architectures and subchannel transponders, muxponders and crossponders are disclosed, and techniques are employed (at the subchannel level/layer), to facilitate the desired optical routing, switching, concatenation and protection of client circuits mapped to these subchannels across the nodes of a WDM network. Subchannel hopping may also be used to increase the optical network security. | 11-14-2013 |
| 20130302029 | WAVELENGTH TUNING TIME MEASUREMENT APPARATUS AND METHOD FOR MULTI-WAVELENGTH PASSIVE OPTICAL NETWORK - A wavelength tuning time measurement apparatus and method for a multi-wavelength passive optical network (MW PON) are provided. The wavelength tuning time measurement apparatus for measuring a wavelength tuning time of a wavelength-variable light source included in the MW PON system includes an optical filter configured to pass only light of a certain wavelength bandwidth and a photo detector configured to sense light passing through the optical filter. The wavelength tuning time is a time taken from a time when a wavelength change signal is transferred to the wavelength-variable light source, to a time when light starts to be successively sensed by the photo detector. | 11-14-2013 |
| 20130308936 | Method of Monitoring an Optoelectronic Transceiver with Multiple Flag Values for a Respective Operating Condition - An optoelectronic transceiver includes an optoelectronic transmitter, an optoelectronic receiver, memory, and an interface. The memory is configured to store digital values representative of operating conditions of the optoelectronic transceiver. The interface is configured to receive from a host a request for data associated with a particular memory address, and respond to the host with a specific digital value of the digital values. The specific digital value is associated with the particular memory address received from the host. The optoelectronic transceiver may further include comparison logic configured to compare the digital values with limit values to generate flag values, wherein the flag values are stored as digital values in the memory. | 11-21-2013 |
| 20130315584 | BACKDOOR DIAGNOSTIC COMMUNICATION TO TRANSCEIVER MODULE - Exemplary embodiments of the invention relate to an optical transceiver module having a diagnostic communications link, wherein the link is configured to access diagnostic and other data contained within the transceiver controller via a backdoor interface. Controller data, including operational parameter values and module setup values, is accessible while the transceiver operates in conjunction with an external host and may be retrieved, and sometimes modified, in real time without interrupting normal transceiver operation or suspending the transmission of data over optical fibers. The data is accessed with an external user device via a backdoor interface on the outside of the transceiver module. | 11-28-2013 |
| 20130322870 | Cycle Slip Reduction in Coherent Optical Communications - Carrier phase estimation techniques are provided for processing a received optical signal having a carrier modulated according to a modulation scheme. First and second carrier phase estimation operations are performed on a digital signal derived from an optical carrier obtained from the received optical signal using coherent optical reception. The first carrier phase estimation operation tracks relatively fast phase variations of the optical carrier of the received optical signal to produce a first carrier phase estimation and the second carrier phase estimation operation tracks relatively slow phase variations of the optical carrier of the received optical signal to produce a second carrier phase estimation. A difference between the first and second carrier phase estimations is computed. Occurrence of a cycle slip is determined when the difference is greater than a threshold. A correction is applied to the first carrier phase estimation when the low pass filtered difference exceeds the threshold. | 12-05-2013 |
| 20130322871 | FIBER NETWORK EVENTS MEASUREMENT APPARATUS - A fiber network events measurement apparatus has a laser module alternately generating a pulse signal detecting beam and an FMCW detecting beam. The beams are sent to the fiber network route through a directional coupler. A photo detector receives feedback energy of the beams transmitting in the fiber network route and converts the feedback energy into electronic signals. A mixer uses a frequency difference calculation to obtain a comparison result according to an original and a reflected FMCW signal. The electronic signal is converted into a digital signal by an A/D converter. A signal control unit then obtains a compound trace result including information of characteristic trace and event positions. The compound trace result shows a fiber characteristic trace and event position trace for measuring the fiber network routes. | 12-05-2013 |
| 20130322872 | TECHNIQUE FOR DETERMINING A PROPAGATION DELAY OF AN OPTICAL SIGNAL BETWEEN TWO OPTICAL DEVICES VIA AN OPTICAL LINK - A method and apparatus for measuring a propagation delay of an optical signal between first and second devices in an optical transmission network, the optical signal being transmitted from the first device to the second device via a first optical fiber and from the second device to the first device via a second optical fiber. The second device includes a loopback having a first mode enabling the optical signal to be routed between the two devices. The method includes: detecting by the second device a triggering by the first device of a propagation delay measurement; receiving a measurement signal transmitted by the first device via the first optical fiber; and configuring the loopback in a second mode in which the loopback injects a return signal into the first fiber in response to the measurement signal. The first device implements a method for determining the propagation delay. | 12-05-2013 |
| 20130322873 | SYSTEM AND METHOD FOR QUANTUM TELEPORTATION - A system for quantum teleportation of a quantum state of an input photon, including: a light emitting diode configured to produce a polarization entangled photon pair; a beam splitter configured to direct photons of the entangled photon pair along respective first and second paths; a measurement unit performing a joint measurement on the input photon; a timing unit configured to measure a first delay between the input photon and the photon of the entangled photon pair at a point of maximum indistinguishability of the photons as they pass through the joint measurement unit, and to measure a second delay between the two photons of the entangled photon pair as they exit the light emitting diode; a controller configured to determine a teleportation measurement is valid if the first delay is within a first predetermined timing window and the second delay is within a second predetermined timing window. | 12-05-2013 |
| 20130336647 | OPTICAL COMMUNICATION SYSTEM WITH MONITOR FUNCTIONS AND MONITORING METHOD THEREFOR - Since it is difficult to fast, simply monitor impairments of received signals with higher receiver sensitivity, a monitoring method for an optical communication system according to an exemplary aspect of the invention includes the steps of emitting lightwave signals to be modulated according to a data, forming dips at transitions between temporally consecutive groups of n symbols of the lightwave signals, wherein the dips are formed at each of (n−1) first transitions of the group, no dip is formed at the n-th transition on the lightwave signals, receiving the lightwave signals, extracting frequency components characterized by the numerical value n from received lightwave signals, and monitoring the received lightwave signals by using the frequency components. | 12-19-2013 |
| 20130343747 | Method and System for Dynamic Selection of Transport Path with Lowest Latency - In accordance with a particular embodiment of the present disclosure, a network element may include a network-side interface configured to communicatively couple to a network and a controller communicatively coupled to the network-side interface. The controller may be configured to periodically receive one or more messages indicative of a delay for each of a plurality of paths for a network flow between the network element and a second network element, periodically compare the delays for the plurality of paths, and select a path for a network flow from the plurality of paths based on the delays. | 12-26-2013 |
| 20140010530 | OPTICAL TRANSMITTER, WAVELENGTH MULTIPLEXING TRANSMISSION DEVICE AND OPTICAL TRANSMISSION METHOD - An optical transmitter includes: a modulator; an output light monitoring unit; and a control unit. The modulator includes a dividing unit dividing light inputted to the modulator into first and second branch lights; first and second modulation units performing phase modulation for the first and second branch lights, respectively; a rotator which rotates the polarization plane of one of the first and second modulated lights; and a polarization combining unit combining the first and second modulated lights. The output light monitoring unit monitors light intensity of the output of the polarization combining unit. The control unit controls at least one of the first and second modulation units, on the basis of a monitoring result by the output light monitoring unit. The control includes a light intensity control making the light intensity of the first and/or second modulated light smaller than a maximum value of a modulation curve light intensity. | 01-09-2014 |
| 20140010531 | SCHEDULING METHOD, APPARATUS, AND SYSTEM FOR AVOIDING DUAL-END MONITORING CONFLICT FOR SUBMARINE CABLE OPTICAL LINE - A scheduling method, apparatus, and system for avoiding a dual-end monitoring conflict for a submarine cable optical line are provided, where the method includes: sending a wavelength occupation request message to a peer-end equipment via a selected submarine cable optical line to be monitored, and receiving a wavelength occupation response message returned by the peer-end equipment; parsing the wavelength occupation response message to determine whether a requested wavelength is occupied by the peer-end equipment; and if the requested wavelength is occupied by the peer-end equipment and the wavelength can be switched, monitoring the selected submarine cable optical line to be monitored by using another wavelength after switching; and if the requested wavelength is not occupied by the peer-end equipment, monitoring the selected submarine cable optical line to be monitored by using the requested wavelength. | 01-09-2014 |
| 20140010532 | PILOT SYMBOL AIDED CARRIER PHASE ESTIMATION - Methods and systems for processing an optical signal in a communication system are disclosed. The disclosed methods yield benefits for estimation and tracking of carrier phase of received signals at a digital coherent receiver. Specifically, phase ambiguity is removed by the insertion of pilot symbols into a transmitted data stream. Pilot symbols are detected from a received signal, and carrier phase is estimated for the detected pilot symbols. If carrier phase track of received data symbols was lost, a correction is applied to recover the track. Coherent symbol decoding may be used which has not been possible with prior art techniques due to the possibility of phase tracking loss. | 01-09-2014 |
| 20140016927 | Spectral Analysis For Coherent Optical Receivers - A coherent optical receiver measures a portion of a spectra of a multi-channel optical signal that includes at least one signal adjacent to a selected signal. The coherent optical receiver determines structure and bandwidth information for the measured portion of spectra, and determines one or more filter parameters for the selected signal based on the structure and bandwidth information of the at least one signal adjacent to the selected signal. The coherent optical receiver adjusts one or more active filter parameters of a carrier phase estimator in the optical coherent receiver to have values corresponding to the determined one or more filter parameters. | 01-16-2014 |
| 20140016928 | Tone Signaling For Coherent Optical Data Receivers - A method for extracting admin information from a modulated optical signal. A coherent optical receiver receives the modulated optical signal, where a nominal carrier frequency of the modulated optical signal was modulated using a first slow frequency and second slow frequency associated with an electronic admin signal. The receiver converts the modulated optical signal to an electronic signal, and estimates estimating a plurality of carrier phases of the electronic signal. The receiver determines a plurality of offset values by calculating the time derivative of at least some of the estimated carrier phases, wherein each of the plurality of offset values are proportional to an associated frequency offset component, and the frequency of each offset value corresponds to the first slow frequency or the second slow frequency. The receiver extracts information corresponding to the electronic admin signal using the determined plurality of offset values. | 01-16-2014 |
| 20140023360 | OPTICAL RECEIVING APPARATUS AND CHARACTERISTIC COMPENSATION METHOD - An optical receiving apparatus includes: a compensator configured to compensate an amount of change in a characteristic; a controller configured to obtain, based on a first amount of change in the characteristic with respect to a first optical signal with a first wavelength, the first wavelength, and a wavelength characteristic in the characteristic, a second amount of change in the characteristic made when a second optical signal with a second wavelength is propagated in an optical path, the second wavelength being different from the first wavelength, and obtain a compensation amount based on the second amount of change; and a first setting unit configured to set the compensation amount for the compensator so that the compensator compensates the amount of change in the characteristic. | 01-23-2014 |
| 20140023361 | METHOD AND SYSTEM FOR MONITORING PERFORMANCE OF WAVELENGTH PATH, AND NODE DEVICE - The present disclosure relates to the field of network communication and particularly discloses a method for monitoring performance of a wavelength path. The method includes: receiving, by a second node, a path request message of a wavelength path from an upstream neighboring node, where the path request message includes at least a path identifier of the wavelength path and second wavelength identifier information; obtaining, by the second node, a wavelength identifier according to the second wavelength identifier information, and recording a mapping relationship between the wavelength path and the wavelength identifier; and determining, by the second node according to the wavelength identifier, a low frequency signal modulated at a working wavelength of the wavelength path, and obtaining performance of the wavelength path by monitoring the low frequency signal. A system for monitoring performance of a wavelength path and a node device are also disclosed in embodiments of the present disclosure. | 01-23-2014 |
| 20140029935 | INDICATING A SYNCHRONIZATION POINT BETWEEN A TRANSMITTER AND A RECEIVER OF AN OPTICAL LINK - A receiver receives a predetermined pattern over an optical link from a transmitter. In response to detecting that the predetermined pattern satisfies at least one criterion, indicating that a synchronization point has been reached to allow link training of the optical link to be performed between the transmitter and receiver. | 01-30-2014 |
| 20140029936 | Supporting Multi-Dwelling Units in Passive Optical Networks - One embodiment provides a system for controlling flow rate in an EPON. The system includes an OLT, an ONUs coupled to the OLT via a passive optical splitter, a switch coupled to a port located on the ONU, and a flow-control mechanism. The ONU includes one or more queues corresponding to one or more classes of Services, and one or more ports. The switch includes a plurality of UNI ports, and the switch is configured to switch one or more upstream traffic flows belonging to the one or more classes of services from the plurality of UNI ports. The flow-control mechanism is configured to set a flow rate of an upstream traffic flow of certain class of service originated from a UNI port. The flow-control mechanism sets the flow rate based on status of an ONU queue corresponding to the class of service of the upstream traffic flow. | 01-30-2014 |
| 20140064722 | Optical Transport Network Delay Measurement - In one embodiment, a one-way delay is measured between optical devices in an optical transport network based on roundtrip times of request and corresponding response frames. A first optical device sends a sequence of delay measurement request frames to a second optical device, which varies a local delay before responding to a request frame, thus causing a slippage in the sequence of reply frames received by the first device. The point at which the request frames are received in relation to the stream of frames sent by the optical device can be identified based on the frame slippage. Therefore, the delay measurement can be adjusted by a corresponding offset to the beginning of a frame in order to increase the accuracy of the one-way delay measurement. | 03-06-2014 |
| 20140064723 | Cueing System for Universal Optical Receiver - A universal optical receiver may include an optical channel monitor configured to acquire spectral data for an optical signal on at least one selected optical channel, a tunable local oscillator configured to be tuned to a center frequency of the optical signal on the at least one selected optical channel, a storage device configured to store data associated with the optical signal responsive to acquisition of the spectral data and tuning of the tunable local oscillator, and processing circuitry configured to execute an algorithm that employs a plurality of binary distinctions based on physical characteristics of the optical signal and employs at least one calculation of figure of merit associated with a series of parameter values of the optical signal to identify a format of the optical signal. | 03-06-2014 |
| 20140064724 | RECEIVING DEVICE AND RECEIVING METHOD - A receiving device includes: an amplification fiber configured to include properties to amplify signal light when pumping light is supplied to the amplification fiber and to attenuate the signal light when the pumping light is stopped supplying to the amplification fiber; a receiver configured to receive the signal light output from the amplification fiber; a pumping light source configured to supply the pumping light to the amplification fiber; and a controller configured to control supplying and stopping of the pumping light from the pumping light source to the amplification fiber, so that a level of the signal light input to the receiver is contained within a dynamic range of the receiver. | 03-06-2014 |
| 20140079387 | ADAPTIVE QUANTUM INFORMATION PROCESSING - A method and system for adaptive quantum information processing can be provided by determining a state of a quantum channel governing an environment with a tomography module. Next a scope of the quantum channel can be calculated with a scope algorithm module. Finally, an optimization module can be utilized to optimize the way to quantum mechanically represent information to be transmitted through the quantum channel based on the scope. | 03-20-2014 |
| 20140093234 | METHODS AND APPARATUS FOR MULTIPHASE SAMPLING OF MODULATED LIGHT - A light transmitter transmits multiple light packets, each formatted to include a same message comprising a series of bits, each bit represented as light that is intensity modulated over a bit period at a frequency indicative of the bit. The light packets are transmitted at different start-times to establish different phases, one for each of the light packets, to permit a light receiver to sample each message at a different phase of a fixed sample timeline that is asynchronous to the bit period and the frequency. The light receiver samples the multiple light packets based on the sample timeline, to sample each received message at one of the different sample phases, then constructs a best series of bits based on the multiple demodulated messages. | 04-03-2014 |
| 20140093235 | OPTICAL TRANSPORT NETWORK HIGH ORDER MAPPING SYSTEMS AND METHODS - Optical Transport Network (OTN) High Order (HO) mapping systems and methods utilize pointer processing to map one HO signal into another similarly sized HO signal. An OTN HO mapping method and circuit include receiving a first HO signal at a first rate, asynchronously mapping the first HO signal into a second HO signal at a second rate, wherein the first rate and the second rate are substantially similar, translating a portion of overhead from the first HO signal to overhead of the second HO signal, utilizing pointers in the overhead of the second HO signal for frame alignment of the first HO signal, and transmitting the second HO signal containing the first HO signal. | 04-03-2014 |
| 20140099100 | ONU EMULATOR DEPLOYMENT FOR MIXED TYPES OF ONU TRAFFIC - An Optical Network Unit (ONU) emulator enables traffic emulation in a Gigabit-capable Passive Optical Network (GPON) that couples an Optical Line Termination (OLT) system to the ONU emulator and carries mixed types of emulated ONU traffic and real ONU traffic. The ONU emulator includes one or more emulated ONU platforms; each emulated ONU platform includes multiple ONU emulator blocks, and each ONU emulator block includes circuitry to emulate multiple emulated ONUs simultaneously. An emulated ONU platform generates upstream GPON frames according to respective profiles of the emulated ONUs, and sends the upstream GPON frames to the OLT system. At least a subset of the upstream GPON frames reach the OLT system via one or more passive optical splitters that couple the emulated ONU platform and a set of real ONUs to the OLT system. The emulated ONU platform also receives downstream GPON frames from the OLT system. | 04-10-2014 |
| 20140099101 | TRAFFIC GENERATION AND ANALYSIS FOR ONU EMULATION - An emulated Optical Network Unit (ONU) platform executes the functions of multiple emulated ONUs to enable traffic emulation in a Gigabit-capable Passive Optical Network (GPON) for data traffic, control traffic and management traffic. The emulated ONU platform generates OMCI messages, PLOAM messages, DBRu messages, data traffic and control traffic according to respective statistical specifications in respective profiles of the emulated ONUs. The emulated ONU platform formats and encapsulates the emulated traffic for upstream transmission to an OLT system according to dynamic bandwidth allocation instructions received from the OLT system. The emulated ONU platform then sends the emulated traffic upstream to the OLT system, and receives downstream traffic from the OLT system. | 04-10-2014 |
| 20140099102 | SYSTEMS AND METHODS FOR STATISTICAL SHARING IN OPTICAL COMMUNICATIONS NETWORKS - A method of statistical sharing in an optical communications network is disclosed. The method includes identifying a peak transmission rate and a base transmission rate for each of a plurality of client interface cards of an optical node. | 04-10-2014 |
| 20140099103 | LDPC-CODED MODULATION FOR ULTRA-HIGH-SPEED OPTICAL TRANSPORT IN THE PRESENCE OF PHASE NOISE - Methods and systems for decoding a signal include compensating for impairments in a received signal using at least carrier phase estimation, where residual phase error remains after compensation; calculating symbol log-likelihood ratios (LLRs) for symbols in the compensated signal using Monte Carlo integration; demapping the symbols in the compensated signal using the symbol LLRs and extrinsic information from signal decoding to produce one or more estimated codewords; and decoding each estimated codeword with a decoder that generates a decoded codeword and extrinsic information. | 04-10-2014 |
| 20140099104 | METHOD TO MITIGATE PROPAGATION LOSS IN WAVEGUIDE TRANSMISSION OF QUANTUM STATES - A system comprises a source of entangled photon pairs. The source is to place a signal photon and an idler photon in individual unknown quantum states but in a known entangled quantum state. One or more transmission channels are connected to the source. Each of the one or more transmission channels transmits one of the signal photon or the idler photon. Each of the one or more transmission channels is to substantially balance an instantaneous transmission loss with an instantaneous transmission gain distributed over a transmission distance. Analysis interferometers are configured to receive a corresponding one of the signal photon or the idler photon. Each of the one or more analysis interferometers is to perform a basis measurement on one of the signal photon or the idler photon. Single-photon detectors detect one of the signal photon or the idler photon. | 04-10-2014 |
| 20140112657 | Service Provisioning Enabled Management in SIEPON Switching Subsystem - A service provisioning enabled management in Service Interoperability in Ethernet Passive Optical Network (SIEPON) switching subsystem. The delivery of network services to each of a plurality of subscribers coupled to an optical network unit (ONU) can be defined individually by the service provider. The service-specific functions within the ONU can be configured based on knowledge of the levels of provisioning of network services. | 04-24-2014 |
| 20140119725 | OPTICAL TRANSMISSION SYSTEM AND CONTROL METHOD - An optical transmission system includes multiple multiplexers connected in series and each multiplexing an optical signal and given signal light. Each of the multiplexers includes a multiplexing unit that multiplexes the given signal light that is subject to multiplexing and a second optical signal of a frequency that is adjacent to the frequency of a first optical signal that is included in the given signal light; a monitoring unit that monitors deviation between timings of the first optical signal that is included in the signal light multiplexed with the second optical signal by the multiplexing unit, and the second optical signal; and an adjusting unit that based on a result of monitoring by the monitoring unit, adjusts the timing of the second optical signal that is to be multiplexed with the given signal light, by the multiplexing unit. | 05-01-2014 |
| 20140133848 | Adaptively Coding and Modulating Signals Transmitted Via Nonlinear Channels - An adaptive coding scheme for nonlinear channels improves reliability and an efficiency in digital communication networks. The method monitors channel statistics to analyze an extrinsic information transfer chart of the channels. The channel statistics are fed back to the transmitter to adapt forward error correction coding. A parametric analysis method uses a Gaussian mixture model. The statistical information feedback can adapt an ARQ sheme by adding a weighted received signal to the original coded signals to reduce nonlinear distortion. Trellis shaping, can make the transmitting signal preferable for nonlinear channels. | 05-15-2014 |
| 20140147110 | HIGH-SPEED OPTICAL RECEIVER IMPLEMENTED USING LOW-SPEED LIGHT RECEIVING ELEMENT AND METHOD FOR IMPLEMENTING THE SAME - A high-speed optical receiver implemented using a low-speed light receiving element is provided, which is configured to receive an optical signal having a higher transmission rate than that received using a general avalanche photo diode (APD) by expanding a frequency bandwidth using a receiver circuit configured together with an APD in the optical receiver including the APD, an APD bias control circuit, a transimpedance amplifier (TIA) for amplifying a signal received from the APD to have low noise, and a post amplifier; and a method of implementing such a high-speed optical receiver. | 05-29-2014 |
| 20140147111 | Level Equalization to Compensate for Implementation Impairments in Optical Communication Systems with High-Order Modulations - A method comprising receiving digital samples from an optical communication system, assigning the samples into bins based on signal levels of the samples, computing an average signal level for each bin, determining a level adjustment transformation function for the samples based on the average signal levels of the bins, and applying the level adjustment transformation function to the samples. Also, disclosed is an optical receiver comprising a frontend configured to receive an optical signal over an optical channel, and convert the optical signal into a plurality of sequences of digital samples, and a processor coupled to the frontend and configured to perform a channel equalization on the samples of the sequences, assign the channel equalized samples of each sequence into bins based on signal levels of the channel equalized samples, determine a level adjustment transformation function for each sequence, and apply the level adjustment transformation function to each sequence. | 05-29-2014 |
| 20140147112 | TRANSMISSION DEVICE, TRANSMISSION METHOD, AND COMMUNICATION SYSTEM - In order to provide a transmission device which can resolve the deterioration in transmission characteristics due to lack of the resolution of a D/A converter in a high speed and large capacity digital communication, a transmission device according to an exemplary aspect of the present invention includes an encoding unit encoding input data; an unequal-interval quantization unit quantizing an output signal from the encoding unit by a quantization level number based on a resolution of a subsequent digital-to-analog conversion unit by using an unequally spaced quantization level interval based on the output signal; the digital-to-analog conversion unit converting an output signal from the unequal-interval quantization unit into an analog signal; an output level adjustment unit adjusting an output level of the digital-to-analog conversion unit so as to compensate a difference between a predetermined initial transfer function and a transfer function of the unequal-interval quantization unit; and a modulation unit generating a transmission signal based on an output signal of the digital-to-analog conversion unit adjusted by the output level adjustment unit. | 05-29-2014 |
| 20140153919 | OPTICAL FIBER-BASED DISTRIBUTED ANTENNA SYSTEMS, COMPONENTS, AND RELATED METHODS FOR MONITORING AND CONFIGURING THEREOF - Optical fiber-based wireless systems and related components and methods support radio frequency (RF) communications with clients over optical fiber, including Radio-over-Fiber (RoF) communications. The systems may be provided as part of an indoor distributed antenna system (IDAS) to provide wireless communication services to clients inside a building or other facility. The communications can be distributed between a head end unit (HEU) that receives carrier signals from one or more service or carrier providers and converts the signals to RoF signals for distribution over optical fibers to end points, which may be remote antenna units (RAUs). A microprocessor-based control system or systems may also be employed. The control systems may include one or more microprocessors or microcontrollers in one or more of the components of the system that execute software instructions to control the various components and provide various features for the optical fiber-based distributed antenna systems. | 06-05-2014 |
| 20140169784 | Training-Assisted Carrier Frequency and Phase Recovery in Digital Coherent Optical Communication Systems - A method of recovering frequency and phase associated with an optical carrier signal in an optical communication system includes determining an estimated frequency offset based on a starting training sequence, determining a current frequency offset based on the estimated frequency offset and a current phase during steady-state operation of the optical communication system, determining a current frequency based on the current frequency offset, determining an estimated phase using training symbols inserted into the optical carrier signal, and determining the current phase associated with the optical carrier signal based on the estimated phase and a blind phase search algorithm. A corresponding systems and computer-readable device are also disclosed. | 06-19-2014 |
| 20140169785 | SMART SMALL FORM-FACTOR PLUGGABLE TRANSCEIVER FOR DATA NETWORKS - In one embodiment, a smart small form-factor pluggable (SSFP) transceiver—compatible with SFP size, power, and interconnection standards—includes an optical transceiver, an electrical connector, a protocol processing engine, and a CPU. The SSFP transceiver is configured for use at a client site having no network interface device (NID). The SSFP transceiver (1) mates to a client's network device at an electrical interface within the network device and (2) connects to a network provider's central office (CO) node via an optical cable at an optical interface. The SSFP transceiver is configured to (1) be powered by the network device, (2) power-up upon mating with the network device, (3) be configured by a remote management agent (RMA) of the network provider for communication with the provider network, (4) respond to/generate Operation, Administration, and Management (OAM) messages from/for the CO node, and (5) provide OAM demarcation functions of a conventional NID. | 06-19-2014 |
| 20140169786 | APPARATUS AND METHOD FOR MEASURING IQ IMBALANCE FOR OPTICAL RECEIVER - Provided is an apparatus and method for measuring IQ imbalance, and in particular, is an apparatus and method for measuring IQ imbalance for an optical receiver. The apparatus for measuring IQ imbalance for an optical receiver includes a light generating unit generating optical and reference signals to provide the optical and reference signals to an optical receiver, a graph creating unit creating a Lissajous figure by using an in-phase (I) signal and a quadrature-phase (Q) signal output from the optical receiver in response to the optical and reference signals, and a calculating unit calculating IQ imbalance for the optical receiver with reference to the Lissajous figure. | 06-19-2014 |
| 20140186024 | OPTICAL RECEIVER HAVING A MIMO EQUALIZER - An optical receiver comprising an optical-to-electrical converter and a digital processor having one or more equalizer stages. The optical-to-electrical converter is configured to mix an optical input signal and an optical local-oscillator signal to generate a plurality of electrical digital measures of the optical input signal. The digital processor is configured to process the electrical digital measures to recover the data carried by the optical input signal. At least one of the equalizer stages is configured to perform signal-equalization processing in which the electrical digital measures and/or digital signals derived from the electrical digital measures are being treated as linear combinations of arbitrarily coupled signals, rather than one or more pairs of 90-degree phase-locked I and Q signals. The latter feature enables the digital processor to more-effectively mitigate the receiver-, link-, and/or transmitter-induced signal impairments because various orthogonality-degrading effects can be mitigated in a relatively straightforward manner. | 07-03-2014 |
| 20140186025 | Method and Apparatus for Measuring Round Trip Delay in a Unified Optical-Coaxial Network - A method of determining a round trip delay time in a network comprising receiving a gate message allocating a transmission time window; retrieving a first timestamp from the gate message; setting a first clock to the time corresponding to the first timestamp, and wherein the first clock runs synchronously with a second clock recovered from a received data stream; sending upstream, after a time interval comprising a grant start time included in the transmission time window offset by a random delay time, a registration request message, wherein the registration request message includes a second timestamp obtained from the first clock; and determining a round trip delay (RTT) from a time the registration request message is received and the second timestamp. | 07-03-2014 |
| 20140186026 | INFORMATION COMMUNICATION METHOD - An information communication method that enables communication between various devices includes: determining a plurality of patterns of a change in luminance, by modulating a respective plurality of signals to be transmitted; and transmitting, by each of a plurality of light emitters changing in luminance according to any one of the determined plurality of patterns of the change in luminance, a signal corresponding to the pattern, wherein in the transmitting, each of the plurality of light emitters changes in luminance at a different frequency so that light of one of two types of light different in luminance is output per a time unit predetermined for the light emitter and that the time unit predetermined for the light emitter is different from a time unit predetermined for an other one of the plurality of light emitters. | 07-03-2014 |
| 20140186027 | Testing of Transmitters for Communication Links by Software Simulation of Reference Channel and/or Reference Receiver - A transmitter for a communications link is tested by using a (software) simulation of a reference channel and/or a reference receiver to test the transmitter. In one embodiment for optical fiber communications links, a data test pattern is applied to the transmitter under test and the resulting optical output is captured, for example by a sampling oscilloscope. The captured waveform is subsequently processed by the software simulation, in order to simulate propagation of the optical signal through the reference channel and/or reference receiver. A performance metric for the transmitter is calculated based on the processed waveform. | 07-03-2014 |
| 20140186028 | METHOD AND SYSTEM FOR ENCODING MULTI-LEVEL PULSE AMPLITUDE MODULATED SIGNALS USING INTEGRATED OPTOELECTRONIC DEVICES - Methods and systems for encoding multi-level pulse amplitude modulated signals using integrated optoelectronics are disclosed and may include generating generating a multi-level, amplitude-modulated optical signal utilizing an optical modulator driven by two or more of a plurality of electrical input signals. The optical modulator may configure levels in the multi-level amplitude modulated optical signal. Drivers may be coupled to the optical modulator, and the plurality of electrical input signals may be synchronized before being communicated to said drivers. Two or more of said plurality of electrical input signals may be selected utilizing one or more multiplexers. The one or more multiplexers may select an electrical input or a complement of the electrical input. Phase addition may be synchronized in a plurality of optical modulator elements in the optical modulator utilizing one or more electrical delay lines. The optical modulator may be integrated on a single substrate. | 07-03-2014 |
| 20140199063 | GENERATION OF AN OPTICAL LOCAL-OSCILLATOR SIGNAL FOR A COHERENT-DETECTION SCHEME - An optical receiver having an optical IQ modulator configured to generate an optical local-oscillator (OLO) signal for optical homodyne detection of an optical input signal applied to the optical receiver. The optical receiver further has (i) a phase detector configured to generate an electrical measure of the phase difference between the OLO signal and a carrier wave of the optical input signal and (ii) a phase-lock loop configured to drive the optical IQ modulator using the electrical measure. In an embodiment, the phase detector is configured to generate the electrical measure using both I and Q components of the homodyne-detected signal and in a manner that enables the optical receiver to be compatible with the M-QAM modulation format. | 07-17-2014 |
| 20140199064 | OPTICAL MODULE AND METHOD OF MONITORING OPTICAL MODULE - An optical module include a first substrate including a first surface over which a light emitting element is mounted, an optical waveguide provided with a second surface of the first substrate, a mirror configured to reflect output light of the light emitting element to the optical waveguide, a second substrate, and a light receiving element configured to receive leakage light produced when the output light from the light emitting element is transmitted through the mirror disposed in the optical waveguide, the light receiving element being mounted over the second substrate different from the first substrate. | 07-17-2014 |
| 20140205280 | MEASURING DEVICE AND METHOD OF MEASURING SIGNAL TRANSMISSION TIME DIFFERENCE THEREOF - Provided is a method of measuring signal transmission time difference of a measuring device. The measuring device according to embodiments, by measuring a skew on two optical paths through signal delays of sufficient sizes for skew measurement on the optical paths, even a skew having a minute size can be measured within a measureable range. | 07-24-2014 |
| 20140205281 | APPARATUS AND METHOD FOR MONITORING WAVELENGTH TUNABLE OPTICAL FILTER - A monitoring apparatus, that monitors a wavelength tunable optical filter for filtering an optical signal to which a frequency modulation component is added, includes: an optical filter configured to filter the optical signal output from the wavelength tunable optical filter; a detector configured to detect amplitude of the frequency modulation component included in the optical signal output from the optical filter; a generator configured to generate an output-side amplitude distribution representing a distribution of the amplitude of the frequency modulation component detected by the detector, by sweeping a transmission wavelength of the optical filter; and a monitoring unit configured to monitor arrangement of a transmission wavelength band of the wavelength tunable optical filter with respect to a spectrum of the optical signal based on the output-side amplitude distribution generated by the generator. | 07-24-2014 |
| 20140205282 | OPTICAL TRANSCEIVER FOR PERFORMING DATA COMMUNICATION AND OPTICAL LINK MONITORING, AND OPTICAL NETWORK SYSTEM - An optical transceiver and an optical network system for performing a data communication and monitoring an optical link are disclosed. The optical transceiver may simultaneously perform the data communication and monitor the optical link, and a wavelength of an optical signal for the data communication and a wavelength of an optical signal for monitoring the optical link may be differently set. | 07-24-2014 |
| 20140212132 | ADAPTIVE EQUALIZER TAP COEFFICIENT CORRECTION METHOD AND OPTICAL RECEIVER - A method of tap coefficient correction includes: obtaining a synchronization symbol difference between a first polarization and a second polarization orthogonal to the first polarization; obtaining a delay amount of each of the first polarization and the second polarization in an adaptive equalizer; calculating, in a case where a horizontal axis represents a tap number and a vertical axis represents a tap coefficient and a tap number or a nearest tap number with which an area of a drawn figure is halved is set as a gravity center of tap coefficients, a correction reference gravity center of the tap coefficients set in the adaptive equalizer, based on the synchronization symbol difference and the delay amount; and performing a correction of shifting an entire tap coefficients in units of symbol to cause the correction reference gravity center to be closest to a tap center. | 07-31-2014 |
| 20140212133 | CONTROL DEVICE FOR OPTICAL CHANNEL MONITOR, OPTICAL TRANSMISSION DEVICE, AND METHOD OF CONTROLLING OPTICAL CHANNEL MONITOR - A control device for an optical channel monitor includes: at least one of a processor and a circuit configured to stop calibration of a measured wavelength when no peak intensity of a wavelength of incoming light is detected, the optical channel monitor measuring a light intensity at the measured wavelength, the at least one of processor and circuit configured to determine presence of a peak intensity in the incoming light when detecting the incoming light with a light intensity equal to or more than a given intensity, the at least one of processor and circuit configured to permit the calibration of the measured wavelength which has been stopped to be resumed when the wavelength peak is determined to be present. | 07-31-2014 |
| 20140219650 | NETWORK TRAFFIC MONITORING APPARATUS FOR MONITORING NETWORK TRAFFIC ON A NETWORK PATH AND A METHOD OF MONITORING NETWORK TRAFFIC ON A NETWORK PATH - A network traffic monitoring apparatus and method of monitoring network traffic on a network path is disclosed. The apparatus comprises a first path arranged to receive a portion of the network traffic from the network path and a monitoring port arranged to monitor the portion of network traffic. The apparatus further comprises a switch having an input port communicatively coupled to the first path, and an output port communicatively coupled to the monitoring port. The switch is arranged to selectively toggle between the first state in which the portion of network traffic can pass from the input port to the output port and a second state, in which the portion of network traffic is prevented from passing from the input port to the output port, in dependence of a switching signal. The apparatus further comprises a second path for communicating a monitoring status signal to a network device. | 08-07-2014 |
| 20140233942 | System and method for measuring the phase of a modulated optical signal - The invention is related to phase detection in lidar systems using single photon detectors (SPDs). The frequency at which the SPDs are time gated is related to but not an integer multiple of the frequency of the transmitted optical pulses. Each return optical pulse arrives with a particular temporal position with respect to the nearest gate, and thus is detected with a related detection efficiency. The SPD output can be segmented into multiple time-multiplexed signals whose relative detection efficiency reveals the phase of the optical return pulses, and no such phases have negligible detection efficiency for all the time-multiplexed signals. To mitigate the impact of afterpulsing and other saturation effects, when a first optical pulse is detected with high detection efficiency the next optical pulse that is detected with high detection efficiency is separated by a time period about equal to or greater than the detector dead time. | 08-21-2014 |
| 20140248048 | SIMPLE LOW COST TIP-TILT WAVEFRONT SENSOR HAVING EXTENDED DYNAMIC RANGE - A low cost, high reliability system for correcting aberrations in optical signals is disclosed. A foreoptic assembly, such as a telescope, receives an incoming optical signal and directs it to an active optical element, such as a fast steering mirror. The incoming optical signal is diffracted by a diffractive optical element to shape the image that is formed at a wavefront sensor, such as a quad-cell. The wavefront sensor measures a tip-tilt aberration of the incoming optical signal and the active optical element is adjusted to correct the measured aberration. An outgoing optical signal can be transmitted along substantially the same optical path as the incoming optical signal, but in the opposite direction. Thus, the aberration measured from the incoming optical signal can be automatically accounted for in the outgoing optical signal. | 09-04-2014 |
| 20140248049 | RAPID IN-THE-FIELD AUTO-ALIGNMENT FOR RADIO FREQUENCY AND FREE-SPACE OPTICAL DATA COMMUNICATION TRANSCEIVERS - A local communications apparatus is aligned with a remote apparatus, each apparatus comprising radio frequency (RF) and free space optical (FSO) transceivers with substantially parallel boresight. Coarse alignment is performed using the RF transceiver and fine alignment is performed using the FSO transceiver. A patterned search is performed to locate the RF signal from the remote apparatus and known features of the intensity profile are utilized to locate the global maximum, thus coarsely aligning the pair of apparatuses. A second patterned search is performed to locate the FSO signal from the remote apparatus and an iterative step-search is used to align the FSO signal centroid with the FSO transceiver, thus finely aligning the pair of apparatuses. | 09-04-2014 |
| 20140255024 | METHOD AND DEVICE FOR PROCESSING A COMMUNICATION NETWORK - Method and device for processing a communication network A method and a device for processing a communication network are provided, wherein (a) a first performance parameter of the communication network is determined; (b) a third performance parameter is determined based on the first performance parameter and a second performance parameter, which second performance parameter was previously determined, wherein the second performance parameter comprises a forecast of an expected network performance over time until the end of the scheduled lifetime of the communication network; and (c) the communication network is processed based on the third performance parameter. Furthermore, an according computer program product is suggested. | 09-11-2014 |
| 20140255025 | Intelligent Infrared Remote Pairing - Systems and methods for associating a remote controller with a device are provided. The systems and methods generally relate to receiving a request from a remote controlled to pair the remote controller to a device at several devices and determining at each of the several devices the strength of the wireless pairing request signal received by that device. If a device determines that its received signal is the strongest, the device may be paired with the remote controller. If instead a device determines that its received signal is not the strongest, it may ignore subsequent communications received from the remote controller. | 09-11-2014 |
| 20140270753 | METHOD AND SYSTEM FOR COMMUNICATING WITH REMOTE EQUIPMENT - An embodiment of the invention comprises a testing device selecting at least one power port for testing. The testing device enables at least one power port to output power, where the power may be used by a corresponding remote device that may be present. The testing device may then determine whether a corresponding remote device may be communicatively coupled to it. After the determination, the power port may be disabled from outputting power. | 09-18-2014 |
| 20140270754 | METHOD AND RELATED NETWORK ELEMENT PROVIDING DELAY MEASUREMENT IN AN OPTICAL TRANSPORT NETWORK - A delay measurement method of a path (P) or path segment through a transport network and a corresponding network nodes (NE1, NE2) for performing the delay measurement are described, which provide a higher precision and lower jitter. An originating network node (NE1) inserts a delay measurement request signal (REQ) into an overhead subfield of a first data unit and transmits the first data unit over the path (P) or path segment to a far-end network node (NE2) as part of framed transport signals. The far-end network node (NE2), upon detection of the delay measurement request (REQ), inserts a delay measurement reply signal (REP) into on overhead subfield of a second data unit and transmits the second data unit back to the originating network node (NE1) using framed transport signals in reverse direction. The originating network node (NE1) determines a time difference between insertion of the delay measurement request signal (REQ) and receipt of the delay measurement reply signal (REP). The far-end network node (NE2) further determines an insertion time value indicative of a time difference (t1, t2, t3) between receipt of the delay measurement request signal (REQ) and insertion of the delay measurement reply signal (REP) in reverse direction and communicates the insertion time value back to the originating network node (NE1). The originating network node (NE1) then determines a delay value for the path (P) or path segment from the determined response time difference and the received insertion time value. | 09-18-2014 |
| 20140294377 | PROACTIVE DELAY MEASUREMENT FOR OPTICAL TRANSPORT NETWORK - A network element is disclosed. In accordance with some embodiments of the present disclosure, a network element may comprise a network interface configured to communicatively couple to a network, and a controller communicatively coupled to the network interface. The controller may be configured to determine a delay-measurement interval, and to perform a plurality of delay measurements at a respective plurality of randomly determined times within the delay-measurement interval. Performing a delay measurement may comprise sending an outgoing signal, receiving an incoming signal, and determining a delay time based on the outgoing signal and the incoming signal. | 10-02-2014 |
| 20140301733 | ELASTIC CLIENT INTERFACE FOR TUNABLE OPTICAL TRANSPONDER - There are provided an optical transponder having a first end and a second end, as well as an electric switch having the transponder. The transponder includes an optical interface, at the first end, having a variable rate optical transmitter and a variable rate optical receiver to respectively transmit and receive signals using at least one of different bandwidths and different bit rates. The transponder further includes an electrical interface, at the second end, having an electrical interface throughput matching an optical capacity of the optical interface. The transponder also includes a processor for controlling the optical capacity. | 10-09-2014 |
| 20140308032 | Diagnostic Port for Inter-Switch Link Testing in Electrical, Optical and Remote Loopback Modes - A diagnostic testing utility is used to perform single link diagnostics tests including an electrical loopback test, an optical loopback test, a link traffic test, and a link distance measurement test. To perform the diagnostic tests, two ports at each end of a link are identified and then statically configured by a user. The ports will be configured as D_Ports and as such will be isolated from the fabric with no data traffic flowing through them. The ports will then be used to send test frames to perform the diagnostic tests. | 10-16-2014 |
| 20140308033 | OPTICAL LINE MONITORING SYSTEM AND METHOD - Disclosed is an optical line monitoring system and method which detects an optical line where a disorder occurs, by using an OTDR (Optical Time Domain Reflectometer) pulse pattern with matching information. The optical line monitoring system generates and stores a reference OTDR pulse pattern matched with identification information of an optical channel service unit, and compares the matched reference OTDR pulse pattern with the OTDR pulse pattern collected at an inspection time to verify an optical line region where a disorder occurs. | 10-16-2014 |
| 20140314404 | OPTICAL COMMUNICATION APPARATUS - An optical communication apparatus includes an emitting device and a receiving device. The emitting device includes optical signal emitters, a first driver chip, a first lens member, a first control chip, and a first wireless transmitting and receiving unit. The receiving device includes optical signal receivers, a second driver chip, a second lens member, a second control chip, and a second wireless transmitting and receiving unit. The optical signal emitter emits light carrying optical signals. The first wireless transmitting and receiving unit wirelessly transmits intensity information of the light to the receiving device. The second wireless transmitting and receiving unit receives the intensity information. The second driver chip drives the optical signal receivers to receive the light. The second control chip calculates an intensity of the received light, compares the calculated intensity to the intensity information, and determines whether a transmitting efficiency of the optical communication apparatus is satisfied. | 10-23-2014 |
| 20140321847 | SYSTEM AND METHOD FOR TRANSMITTING DATA IN A NETWORK - A system and method for transmitting data in a network comprising the steps of determining a traffic congestion variable of a data transmission node arranged to receive data from one or more source nodes of the network, using the traffic congestion variable to select a preferred transmission mode for use by the one or more source nodes to transmit data to the data transmission node, and switching an operating transmission mode of each of the one or more source nodes to the preferred transmission mode such that the one of more source nodes transmit data to the data transmission node with the preferred transmission mode. | 10-30-2014 |
| 20140328584 | REDUCING PHASE NOISE ASSOCIATED WITH OPTICAL SOURCES - An optical transmitter may include an optical source to provide a first optical signal having a varying frequency; an optical circuit to receive a portion of the first optical signal and provide a second optical signal corresponding to a change in frequency of the first optical signal; a photodetector to receive the first optical signal and provide an electrical signal that is indicative of the change in frequency of the first optical signal; an integrator to receive the electrical signal and provide an inverted electrical signal; and a controller to process the inverted electrical signal and provide a current, associated with the inverted electrical signal, to the optical source. The optical source may reduce the phase noise associated with the first optical signal based on the current. | 11-06-2014 |
| 20140328585 | EQUALIZATION SIGNAL PROCESSOR, OPTICAL RECEIVER INCLUDING THE SAME, AND METHOD FOR EQUALIZATION SIGNAL PROCESSING - It becomes difficult to perform the optimum equalization signal processing in coherent receiving systems if a channel response in an optical fiber transmission line includes a factor without temporal centrosymmetry, therefore, an equalization signal processor according to an exemplary aspect of the invention includes an equalization filter means configured to receive digital signals by coherent receiving systems; a coefficient control means configured to control coefficients defining characteristics of the equalization filter means; a significant coefficient holding means configured to hold significant coefficients of significant values among initial values of the coefficients; a significant coefficient positioning means configured to determine a significant coefficient position, a position of the significant coefficients in the initial values, so that equalization characteristics of the equalization filter means may be optimized; and a significant coefficient setting means configured to allocate the significant coefficients to the significant coefficient position. | 11-06-2014 |
| 20140334813 | CHANNEL VALIDATION IN OPTICAL NETWORKS USING MULTI-CHANNEL IMPAIRMENT EVALUATION - In an optical communication network that includes a plurality of interconnected network nodes, a method includes storing in each network node, and for each communication channel that traverses the node, one or more impairment margins of respective impairments that affect the communication channel. A potential communication channel that traverses a subset of the nodes in the network is identified. A quality of the potential communication channel is evaluated by processing the impairment margins stored in the nodes in the subset. | 11-13-2014 |
| 20140341565 | Device for Measurement of the Profile of Very Short Duration Single Pulses - The invention relates to a device for measuring the profile of a single pulse or a pulse with a very low repetition rate, comprising
| 11-20-2014 |
| 20140355977 | Optical Switching - A network node comprises an optical input, an optical output, a random-access queue and a processing system. It receives a data packet, at the optical input and determines whether to process it as a guaranteed-service packet or as a statistically-multiplexed packet. A guaranteed-service packet is output within a predetermined maximum time of receipt, optionally within a data container comprising container control information. A statistically-multiplexed packet is queued. The node determines a set of statistically-multiplexed packets that would fit a gap between two guaranteed-service packets; selects one of the packets; and outputs it between the two guaranteed-service packets. | 12-04-2014 |
| 20140355978 | OPTICAL TRANSMISSION SYSTEM, OPTICAL TRANSMISSION APPARATUS, AND OPTICAL TRANSMISSION METHOD - An optical transmission system includes a transmission side optical transmission apparatus having a transmitting unit configured to transmit optical signals of a predetermined number of differing wavelengths, and a processor configured to apply to the optical signals transmitted from the transmitting unit, a predetermined offset related to a tilt; and a reception side optical transmission apparatus having a receiving unit configured to receive the optical signals transmitted from the transmitting unit, a measuring unit configured to measure an optical signal count of the optical signals receivable by the receiving unit, and a notifying unit configured to give notification of the optical signal count measured by the measuring unit. The processor adjusts the offset in an increasing direction when the optical signal count notified by the notifying unit increases, and adjusts the offset in a decreasing direction when the optical signal count notified by the notifying unit decreases. | 12-04-2014 |
| 20140363154 | OPTICAL SIGNAL PROCESSING DEVICE, OPTICAL SIGNAL PROCESSING METHOD AND RECORDING MEDIUM - An optimization unit in an optical receiver divides a symbol region out of a plurality of symbol regions into which signal points that specifies symbol information included in an optical signal are classified, into a plurality of division regions from the symbol center coordinate of the symbol region. Moreover, the optimization unit accumulates the signal points of the symbol information for every division region in the symbol region. Furthermore, based on the accumulated number of signal points for every division region, the optimization unit controls the average length of a phase estimation unit when the phase noise of the optical signal is calculated. | 12-11-2014 |
| 20140363155 | DYNAMIC CELL BONDING (DCB) FOR RADIO-OVER-FIBER (ROF)-BASED NETWORKS AND COMMUNICATION SYSTEMS AND RELATED METHODS - Communication devices, systems, and methods for dynamic cell bonding (DCB) for networks and communication systems are disclosed. In one embodiment, a method of operating a wireless communication system is provided. The method includes determining a first plurality of remote units in a cloud bonded to a communication session, measuring a received signal strength from each of the first plurality of remote units, and measuring a received signal strength from each of a second plurality of remote units in the cloud not bonded to the communication session. One or more of the second plurality of remote units is dynamically bonded to the communication session if the measured received signal strength of the one of the second plurality of remote units is greater than the measured received signal strength of the first plurality of remote units. | 12-11-2014 |
| 20140363156 | METHOD AND APPARATUS FOR PRESENTING INDOOR TRAFFIC MAP - Embodiments of the present invention relate to a method and an apparatus for presenting an indoor traffic map. The method includes: sending, by a near-end unit of an indoor distribution system, a pseudo carrier to a polled remote unit according to a pre-established polling routing table; receiving operating data collected by the remote unit and a measurement report reported by the terminal; determining traffic map data of the polled remote unit; determining whether the traffic map data meets a traffic map presenting condition, and presenting an indoor traffic map when the traffic map presenting condition is met. In the present invention, remote units are polled sequentially by using a pseudo carrier and a polling routing table, operating data of the remote unit and a measurement report of the terminal are obtained as traffic map data, to perform representation of a traffic map. | 12-11-2014 |
| 20140369676 | PON SYSTEM, OLT, AND ONU - An OLT includes an ONU link state monitor that monitors a registered state of each of the ONUs, a continuous light-emission monitor that detects a continuous light-emitting state on the basis of a monitor result given by the ONU link state monitor, and identifies an ONU being in continuous light-emission, and an optical output power shut down command unit that commands the ONU identified by the continuous light-emission monitor to shut down the optical output power. Each of the ONU includes an optical transmitter and receiver device that transmits and receives an optical signal to/from the OLT, and a light output controller that shuts down light of the optical transmitter and receiver device in response to the command given by the optical output power shut down command unit. | 12-18-2014 |
| 20140369677 | OPTICAL TRANSMITTER AND OPTICAL TRANSMISSION METHOD - An optical transmitter converts a plurality of transmission signals transmitted via a plurality of lanes into a multi-carrier signal and transmits the multi-carrier signal. The optical transmitter includes: a controller configured to generate allocation information that indicates an allocation of sub-carriers to the plurality of lanes according to a bit rate of the transmission signal of each of the lanes and a possible transmission capacity of each of the sub-carriers; and a signal processor configured to convert the plurality of transmission signals into the multi-carrier signal in accordance with the allocation information generated by the controller. | 12-18-2014 |
| 20150030322 | METHOD AND DEVICE FOR DETERMINING WHETHER A CONFIGURATION OF AN OPTICAL TRANSMISSION INTERFACE HAS TO BE ADJUSTED - A method for determining whether a configuration of an optical transmission interface of a first device has to be adjusted for transmitting an optical signal to a second device via an optical band-pass filter, the second device including an optical reception interface configured to enable receiving optical signals output by the optical band-pass filter and transmitted by the first device on a carrier wavelength when the carrier wavelength is included in the passband of the optical band-pass filter. A monitoring device performs: obtaining an information representative of a signal temporal shape corresponding to a symbol of an optical signal received by the second device, from the first device, via the optical band-pass filter; determining whether the configuration of the optical transmission interface of the first device has to be adjusted, on the basis of the information representative of the signal temporal shape. | 01-29-2015 |
| 20150037027 | METHOD AND DEVICE FOR DETERMINING WHETHER A CONFIGURATION OF AN OPTICAL TRANSMISSION INTERFACE HAS TO BE ADJUSTED - A method for determining whether a configuration of an optical transmission interface of a first device has to be adjusted for transmitting an optical signal to a second device via an optical band-pass filter, the second device including an optical reception interface configured to enable receiving optical signals output by said optical band-pass filter and transmitted by the first device on a carrier wavelength when the carrier wavelength is in the passband of the optical band-pass filter. A monitoring device performs: obtaining an information representative of a time drift between successive symbols of an optical signal received by the second device, from the first device, via the optical band-pass filter; and determining whether the configuration of the optical transmission interface of the first device has to be adjusted, on the basis of the information representative of the time drift. | 02-05-2015 |
| 20150043905 | System and Method for Photonic Switching and Controlling Photonic Switching in a Data Center - In one embodiment, data center includes a packet switching core and a photonic switch. The photonic switch includes a first plurality of ports optically coupled to the packet switching core and a second plurality of ports configured to be optically coupled to a plurality of peripherals, where the photonic switch is configured to link packets between the plurality of peripherals and the packet switching core. The data center also includes a photonic switch controller coupled to the photonic switch and an operations and management center coupled between the packet switching core and the photonic switch controller. | 02-12-2015 |
| 20150043906 | METHOD, SYSTEM, AND NODE DEVICE FOR MONITORING OPTICAL PERFORMANCE OF WAVELENGTH CHANNEL - Embodiments of the present invention relate to the field of network communications and specifically discloses a method for monitoring optical performance of a wavelength channel, including: receiving, by a first node, an optical signal over an operating wavelength and obtaining, by the first node, optical performance of the unestablished wavelength channel by monitoring the optical signal at a receiving end. Embodiments of the present invention further disclose a system and a node device for monitoring optical performance of a wavelength channel. | 02-12-2015 |
| 20150055946 | METHOD TO CONTROL TRANSMITTER OPTICAL MODULE - An optical module capable of monitoring an inner temperature thereof by a simple arrangement is disclosed. The optical module installs an avalanche photodiode (APD). The APD generates the first photocurrent under a bias where the APD shows the multiplication factor thereof M equal to the unity, and the second photocurrent under another bias where the multiplication factor becomes greater than the unity. The operating temperature of the laser diode (LD) may be estimated from a ratio of the first photocurrent to the second photocurrent. | 02-26-2015 |
| 20150071630 | NON-LINEAR DISTORTION COMPENSATOR, METHOD OF COMPENSATING NON-LINEAR DISTORTION, AND OPTICAL RECEIVER - A non-linear distortion compensator includes: a non-linear distortion calculator that calculates non-linear distortion occurred in a received optical signal based on signal information after recovery of a carrier wave in a carrier wave phase recovery which recovers a phase of the carrier wave of the received optical signal; and a non-linear compensator that compensates the non-linear distortion of the received optical signal based on the non-linear distortion obtained by the non-linear distortion calculator. | 03-12-2015 |
| 20150078742 | METHOD FOR DETECTING FIBER JUMPER CONNECTION AND APPARATUS FOR DETECTING FIBER JUMPER CONNECTION - Embodiments of the present invention provide a method and an apparatus for detecting a fiber jumper connection. The method includes: receiving first configuration information delivered by a management system, where the first configuration information includes port identities of at least one pair of ports that are supposed to be connected on a fiber distribution device; receiving second configuration information reported by the fiber distribution device; and matching the ports that are supposed to be connected indicated by the first configuration information and the connected ports indicated by the second configuration information to obtain a matching result, where the matching result includes port identities of connected ports and unconnected ports that do not match the ports that are supposed to be connected, thereby improving efficiency of detecting a fiber jumper connection. | 03-19-2015 |
| 20150093107 | RATELESS VISIBLE LIGHT COMMUNICATION - Methods, systems, apparatuses, and devices are described for transmitting and receiving data using rateless visible light communication (VLC). A codeword having a plurality of symbols is identified. The codeword is repetitively transmitted in a VLC signal while, from one transmission of the codeword to a next transmission of the codeword, imparting changes in timings of the symbols of the codeword relative to a timing reference of an image capture frame of an image sensor configured to receive the codeword. A VLC signal including repetitions of a codeword is received. The codeword has a plurality of symbols. A determination is made regarding whether at least one symbol of the codeword is undetected in a repetition of the codeword. Upon determining that the at least one symbol is undetected in the repetition of the codeword, at least one other repetition of the codeword is searched to detect the at least one symbol. | 04-02-2015 |
| 20150110485 | MULITFUNCTIONAL OPTICAL MICRO SENSOR SYSTEM - A device for measuring a measured optical transmission path includes a first optical transmitter transmitting into the measured optical tramsmission path and a compensation transmitter transmitting into a compensation optical transmission path. The device includes an optical receiver for receiving transmissions from each of the first optical transmitter and the compensation transmitter. A controller controls the compensation transmitter and provides a controller output signal representative of a measured value of the first transmission path. A nose piece separates the optical transmitter from the optical receiver. The compensation transmitter is placed in a first cavity. The receiver is placed in a second cavity. A filter in the measured optical transmission path has a transmissivity for the wavelength of the light of the first optical transmitter of at least 50% and an absorption factor for the wavelength of the light of the compensation transmitter of at least 25%. | 04-23-2015 |
| 20150117854 | OPTICAL DATA TRANSMISSION DEVICE - Proposed is an optical data transmission device for an optical access network that comprises a laser transmission unit, which generates an optical transmission signal, and a driving unit, which controls the laser transmission unit for modulating the transmission signal. The device comprises an optical reception unit that converts the received optical signal into an electrical measurement signal. For this, the reception unit contains a photo-diode and an electrical amplifier. The optical reception unit is separate from the laser transmission unit. A control unit controls the laser transmission unit, such that the optical transmission signal is modulated in dependence on a measurement signal. The control unit measures multiple electrical measurement signals during a measurement interval and determines an averaged received electrical measurement signal. Even furthermore, the control unit controls the electrical amplifier, such that the electrical amplifier is turned off during a time interval prior to the measurement interval. | 04-30-2015 |
| 20150117855 | OPTICAL SUBASSEMBLY TESTING SYSTEM - An optical subassembly testing system includes a pedestal, a rotation device, a holder and a supporting device. The rotation device includes a rotation member, a connecting plate and a retractable pillar. The rotation member is arranged on the pedestal and rotates relative to the pedestal. The connecting plate includes a mounting portion and a protruding portion, the mounting portion is arranged on the rotation member, the protruding portion extends away from the mounting portion and is exposed outside of the rotation member, and the retractable pillar is fixed perpendicular to the pedestal on an end of the protruding portion. The holder is fixed on an end of the retractable pillar and clamps a fiber connector. The supporting device includes a plurality of receiving grooves surrounding the pedestal, the receiving grooves are configured for receiving transmitter optical subassemblies (TOSAs) to test by aligning the fiber connector with each TOSA in turn. | 04-30-2015 |
| 20150295641 | Apparatus and Method for Optical-Network Monitoring - A method, apparatus, and system for network monitoring, and more specifically for correlating downstream devices in an optical network with downstream ports of an optical splitter through which they are communicating with a central office. The downstream devices operational on the network are indentified and listed in a correlation table. Selected subsets of these devices are then monitored, preferably by an ISM under the direction of a management node, in a series of monitoring cycles until a satisfactory correlation may be achieved. The correlation cycle may be performed at startup, as needed, or on a periodic basis. | 10-15-2015 |
| 20150318917 | SYSTEM AND METHOD FOR CABLE MONITORING - Embodiments include methods, apparatus, and systems for cable monitoring. One embodiment includes a method that receives data from an optical transceiver coupled to a cable and a RFID (radio frequency identification) device mounted to the cable. The data from the optical transceiver and RFID device is used to determine an operational status of the cable. | 11-05-2015 |
| 20150318921 | BIAS MONITORING METHOD AND APPARATUS AND TRANSMITTER - A bias monitoring method and apparatus and a transmitter, the bias monitoring apparatus being used for monitoring deviation of a direct current bias point of an optoelectronic modulator and including: a first signal processing unit configured to perform first signal processing on an electric driving signal inputted into the optoelectronic modulator, so as to output a reference signal; a second signal processing unit configured to perform second signal processing on an electric output signal obtained based on an optical signal outputted by the optoelectronic modulator, so as to output a monitoring signal; and a monitoring signal calculating unit configured to calculate correlation between the reference signal and the monitoring signal, and output a calculation result of the correlation as a bias monitoring signal. The sensitivity of the bias monitoring apparatus may be improved, and complexity of hardware may be lowered. | 11-05-2015 |
| 20150318928 | METHOD AND SYSTEM FOR DETERMINING AND CONTROLLING POWER OF OPTICAL TRANSMITTER OF OPTICAL NETWORK UNIT FOR TIME AND WAVELENGTH DIVISION MULTIPLEXING PASSIVE OPTICAL NETWORK - Disclosed are a method and system for determining and controlling power of an optical transmitter of an optical network unit (ONU) for a time and wavelength division multiplexing passive optical network (TWDM-PON). The system includes an RSSI collector configured to collect received signal strength indication (RSSI) information from upstream optical signals received from the ONUs connected to optical line terminal (OLT) ports, an ONU power level determiner configured to gather the pieces of RSSI information about the ONUs from the RSSI collector, and to determine power of optical transmitters of the ONUs based on the gathered information, and a power mode controller configured to receive power mode setting information of the optical transmitters of the ONUs from the ONU power level determiner, and to generate a physical layer operation and maintenance (PLOAM) message to control power modes of the ONUs based on the received power mode setting information. | 11-05-2015 |
| 20150319639 | SYSTEMS AND METHODS FOR VISIBLE LIGHT COMMUNICATIONS PERSONAL AREA NETWORK AND WIRELESS LOCAL AREA NETWORK INTERWORKING - A method, a controller, and a network provide Visible Light Communications Personal Area Network (VPAN) and Wireless Local Area Network (WLAN) interworking and mobility management systems and methods. The method includes receiving data traffic from both a Wireless Local Area Networking (WLAN) domain and a Visible Light Communications (VLC) domain, uniquely identifying, in a controller, a device in both the WLAN domain and the VLC domain as a same device using an addressing scheme associated with both the WLAN domain and the VLC domain, wherein the device is configured to operate in both the WLAN domain and the VLC domain, and providing data traffic to the device via one of the WLAN domain and the VLC domain based on a plurality of factors. | 11-05-2015 |
| 20150333823 | MONITORING OF OPTICAL PERFORMANCE IN AN OPTICAL DATA TRANSMISSION NETWORK - A method for monitoring optical performance in an optical data transmission network, the optical data transmission network including a first router node, a second router node, and an optical data transmission line connecting the first router node with the second router node providing optical data transmission from the first router node to the second router node using at least two channels, includes: in a measurement step, determining, at the spare IP router interface, optical performance parameters of the at least two channels; in a transmission step subsequent to the measurement step, transmitting the determined optical performance parameters to a remote control unit; and in an analysis step subsequent to the transmission step, analyzing the transmitted optical performance parameters and determining whether to take a corrective action to improve optical performance of the at least two channels. | 11-19-2015 |
| 20150333824 | MARGIN-BASED OPTIMIZATION SYSTEMS AND METHODS IN OPTICAL NETWORKS FOR CAPACITY BOOSTING - Systems and methods of optimizing capacity of an optical network include identifying a first wavelength with an associated target capacity; determining that the first wavelength has insufficient capability to operate at the associated target capacity; and adjusting one or more wavelengths to increase capability of the first wavelength such that the first wavelength can operate at the associated target capacity. | 11-19-2015 |
| 20150334048 | Traffic Adjustment Method and Apparatus - A traffic adjustment method and an apparatus, which relate to the communications field, so that statistics on traffic of a receiving apparatus that needs to receive a first multicast packet can be accurately collected in a process of multicast packet transmission. A specific solution is as follows: A sending apparatus sends a first multicast packet, and determines whether an identity of a first receiving apparatus is in a receiving list of a first group, and if the identity of the first receiving apparatus is in the receiving list of the first group, the sending apparatus acquires multicast traffic of the first receiving apparatus, and subtracts the multicast traffic of the first receiving apparatus from preset traffic allocated to the first receiving apparatus to obtain corrected traffic of the first receiving apparatus. | 11-19-2015 |
| 20150341111 | COMMUNICATION LIGHT DETECTOR - A communication light detector is configured to draw a leak portion of communication light being transmitted via a communication light detecting adapter as a leaky light, receive the leaky light, and detect whether the communication light is being transmitted via the communication light detecting adapter or not. The communication light detector includes a light receiving element configured to receive the leaky light, and an optical filter configured to pass only the leaky light toward the light receiving element. | 11-26-2015 |
| 20150341112 | COMMUNICATION LIGHT DETECTING OPTICAL MODULE AND COMMUNICATION LIGHT DETECTING STRUCTURE - A communication light detecting optical module includes a plurality of optical transmission lines each including a light drawing portion to draw a leak portion of communication light being transmitted in the each of the plurality of optical transmission lines as a leaky light, and a multifiber connector with the plurality of optical transmission lines being arranged side by side, inserted and fixed therein. The multifiber connector includes an adhesive filled portion exposing the plurality of optical transmission lines and being filled with an adhesive to fix the plurality of optical transmission lines. The plurality of optical transmission lines are being inserted and fixed in the multifiber connector in such a manner that the light drawing portions are being arranged in the adhesive filled portion. | 11-26-2015 |
| 20150358078 | POLARIZATION DIVISION MULTIPLEXING OPTICAL COMMUNICATION RECEPTION DEVICE, POLARIZATION DIVISION MULTIPLEXING OPTICAL COMMUNICATION SYSTEM, AND POLARIZATION DIVISION MULTIPLEXING OPTICAL COMMUNICATION METHOD - A polarization demultiplexing optical communication receiver is provided with a signal quality change imparting means which imparts a signal quality change to multiplexed two optical signals; and a signal quality monitoring means which compares signal qualities of the two optical signals with each other after the multiplexed two optical signals imparted with the signal quality change are subjected to polarization separation so as to specify the two optical signals based on a result of the comparison. This makes it possible to reduce transmission characteristics degradation of a polarization-multiplexed optical signal, and to implement transmission having high reliability. | 12-10-2015 |
| 20150365223 | TRANSMISSION DEVICE AND DELAY MEASUREMENT METHOD - A transmission device includes: a transmitter configured to transmit frames including a bit string having a predetermined pattern to an opposite device to the transmission device; a measurement unit configured to measure an elapsed time from a first time at the transmission of the frames including the bit string having the predetermined pattern to the opposite device to a second time at a reception of the frames including the bit string having the predetermined pattern from the opposite device; and a determination unit configured to determine a transmission delay time between the transmission device and the opposite device, based on the measurement result of the measurement unit. | 12-17-2015 |
| 20150372932 | METHOD AND APPARATUS FOR CHECKING DATA FRAME LENGTH - A method and apparatus for checking a data frame length relate to an Ethernet passive optical network in the communication field. The method includes: during reception of an Ethernet frame, when determining through analysis that a received Ethernet frame is a data frame, extracting frame length information and frame indication information in the data frame, and calculating a frame length mantissa according to the frame length information; writing the data frame into a small cache for storage according to the frame indication information, and counting write enable signals used for controlling writing of a data frame by using a base-N counter, so as to obtain a count value of the write enable signal; and comparing the frame length mantissa with the count value, and if a comparison result is consistent, then a data frame length being successfully checked, and writing the frame length information into the small cache for storage. | 12-24-2015 |
| 20150373610 | Switching Method for Visible-Light Communication Device and Terminal Device at Access Point - A switching method and device for a visible-light communication device and a terminal device at an access point, comprising: configuring different identification codes for visible-light communication devices; when a terminal device satisfies a switching condition, its original access point selecting a visible-light communication device whose signal quality is higher than that of the original access point as a target access point according to a peripheral access list, sending its capability to the target access point, and initiating a switching request; the original access point selecting an operating mode according to an indication of the target access point to notify the terminal device, and forwarding response fed back by the terminal device to the target access point; and when receiving response for the switching request fed back by the target access point and downlink resource allocation information, the original access point sending a switching command to the terminal device to switch. | 12-24-2015 |
| 20150381284 | METHOD, COMMUNICATION APPARATUS, AND COMMUNICATION SYSTEM - A method of communication through a network, executed by a communication apparatus that performs transmission by selecting a transmission mode, the method includes determining whether to transmit the data in either a first mode or a second mode when transmitting data; transmitting the data using a predetermined number of kinds of optical signals having different levels in light intensity when determined to transmit in the first mode; and transmitting the data using a fewer number of kinds of optical signals having different levels in light intensity than the predetermined number when determined to transmit in the second mode. | 12-31-2015 |
| 20160006505 | MULTIFUNCTIONAL MICRO SENSOR SYSTEM - A measurement device relates to a Halios system for measuring an optical transmission path, in which at least one receiver and a compensation transmitter are optically separated from each other by an optical barrier in such a matter that a direct irradiation of said receiver by said compensation transmitter is not possible. Said compensation transmitter and a transmitter are of the same type and/or have at least a common electric optical working point in an optical working point. Said optical barrier has a compensation path, characterized by a compensation window, which attenuates the light of the compensation transmitter before it hits the receiver in such a manner that the compensation transmitter and said transmitter are operated at least in an optical working point by a controller in said identical electro-optical working point. | 01-07-2016 |
| 20160006636 | METHOD AND NODE FOR DETECTING SUBFRAME SEQUENCE ERROR IN INVERSE MULTIPLEXING - Disclosed are a method and a node for detecting subframe misordering, including that: a receiving node receives subframes from a transmitting node, and judges whether a trail trace identifier carried in each subframe received is same with a desired trail trace identifier of a subframe to be received; when the trail trace identifier carried in each subframe received is same with the desired trail trace identifier of the subframe to be received, judges whether a subframe number value carried in each subframe belongs to a range of desired subframe number values of the subframe to be received, and if it has been judged that the subframe number value carried in the received subframe does not belong to the range of desired subframe number values of the subframe to be received, determines that there is subframe misordering. | 01-07-2016 |
| 20160013861 | MONITORING OF COMMUNICATIONS NETWORK AT PACKET AND OPTICAL LAYERS | 01-14-2016 |
| 20160013862 | METHOD, SYSTEM AND OPTICAL NETWORK TERMINAL OF ETHERNET PERFORMANCE DETECTION | 01-14-2016 |
| 20160028564 | COMMUNICATION DEVICE AND METHOD FOR REPRODUCING DATA - A communication device includes a processor that executes a process including: detecting a plurality of zero-cross samples each having a different plus-minus sign from a sign of an adjacent sample from among a plurality of samples obtained by oversampling a received signal; changing positions of the detected zero-cross samples to positions inside a window referring to a position of a reference zero-cross sample selected from the detected zero-cross samples; calculating an average value of relative distances between the reference zero-cross sample and the zero-cross samples, after the positions of the zero-cross samples are changed at the changing; and determining a zero-cross point serving as a reference point for estimating a peak position of the received signal, based on the calculated average value of the relative distances and the reference zero-cross sample. | 01-28-2016 |
| 20160036524 | METHOD FOR ESTIMATING FREQUENCY OFFSET, APPARATUS AND SYSTEM - A method, apparatus and system for estimating frequency offset that includes: a first calculating unit to calculate a correlation value of each of multiple sequences with different lengths according to a received signal containing the sequences with different lengths, where each of the sequences is repeatedly transmitted many times in the signal; a second calculating unit to calculate a decimal frequency according to the correlation value; a first determining unit to determine an integer frequency offset according to the decimal frequency offset to which each of the sequences corresponds; and a second determining unit to determine a total frequency offset according to the decimal frequency offset and the integer frequency offset. | 02-04-2016 |
| 20160047643 | INTERFERENCE SYSTEM AND AN INTERFERENCE METHOD - An interference system, comprising:
| 02-18-2016 |
| 20160056890 | ACTIVE OPTICAL CABLE ASSEMBLIES AND METHODS FOR THERMAL TESTING THEREOF - Active optical cable assemblies and methods for thermally testing active optical cable assemblies are disclosed. In one embodiment, a method of thermally testing an active optical cable assembly includes providing electrical signals to an optical transmission module within a first connector that converts the electrical signals into optical signals for transmission over one or more optical fibers of the active optical cable assembly, and applying heat to the first connector as the electrical signals are provided to the optical transmission module. The method further includes detecting electrical signals at a second connector of the active optical cable assembly. The detected electrical signals are converted from the optical signals by an optical receiver module within the second connector. The method further includes determining if the optical transmission module satisfies a benchmark at a threshold temperature of the optical transmission module based on the electrical signals detected at the second connector. | 02-25-2016 |
| 20160065309 | Method of Monitoring an Optoelectronic Transceiver with Multiple Flag Values for a Respective Operating Condition - The circuit monitors operation of an optoelectronic transceiver that includes a laser transmitter and a photodiode receiver. The circuit includes analog to digital conversion circuitry configured to convert a first analog signal corresponding to a first operating condition of said optoelectronic transceiver into a first digital value, and convert a second analog signal corresponding to a second operating condition of said optoelectronic transceiver into a second digital value corresponding to a second operating condition. The circuit also includes a memory configured to store the first digital value in a first memory location that is mapped to a predefined and unique first address and to store the second digital value in a second memory location that is mapped to a predefined and unique second address. The circuit includes an interface configured to enable a host external to the optoelectronic transceiver to access the first digital value using the first address and to access the second digital value using the second address. | 03-03-2016 |
| 20160066073 | OPTICAL NETWORK DEVICE WITH INTEGRATED PORT MIRRORING - Techniques are described for obtaining, by an optical network device (OND) coupled to an optical network, physical layer data of the optical network; generating, by the OND, an encapsulated representation of the physical layer data of the optical network; and outputting the encapsulated representation of the physical layer data to a diagnostic device. | 03-03-2016 |
| 20160072577 | SYSTEM FOR SUPERVISING A MONOFIBRE LINE BY POLARISING A PROBE SIGNAL - The invention relates to a method for retransmitting a probe signal, implemented by a device in a remote terminal (RT) connected to a central terminal (CT) by a monofibre optical line (MFOL), the probe signal being received by the remote terminal (RT) and having a predetermined wavelength (λprobe), the central and remote terminals exchanging over said optical lines useful data signals (λd, λu) having wavelengths other than those of the probe signal, including the following steps: receiving the polarised probe signal at a first polarity (P | 03-10-2016 |
| 20160080076 | COMMUNICATION SYSTEM, ELECTRONIC DEVICE, ELECTRONIC TIMEPIECE, COMMUNICATION METHOD - To receive data normally in communication by an optical signal by an electronic device which transmits data even when a transmission frequency differs. An electronic device transmits a transmission-frequency measurement signal for measuring a transmission frequency of data and transmits the data by using a light source which transmits an optical signal. An electronic timepiece specifies the transmission frequency of data based on the transmission-frequency measurement signal received by a solar battery which receives the optical signal and receiving the data by the solar battery based on the specified transmission frequency. | 03-17-2016 |
| 20160080079 | SIGNAL TRANSMISSION DEVICE, SIGNAL TRANSMISSION METHOD, SIGNAL RECEPTION DEVICE, AND COMMUNICATION SYSTEM - A signal transmission device, includes a processor; and a memory which stores a plurality of instructions, which when executed by the processor, cause the processor to execute: irradiating incoming light, which includes one or more symbols with which the incoming light has been varied in response to a signal to be transmitted, on an arbitrary object with a first intensity; and controlling an amplitude of the first intensity on a basis of a reflectance of the incoming light irradiated on the object. | 03-17-2016 |
| 20160080080 | SIMULCAST MESH DIMMABLE ILLUMINATION SOURCE - An LED illumination device is configured to receive coded messages by at least one of radio signals in free space, electrically conducted signals by wire, and light wave propagated signals in free space, process the coded messages, and transmit the coded messages by two or more of radio signals in free space, electrically conducted signals by wire, and light wave propagated signals in free space. | 03-17-2016 |
| 20160087716 | System and Method for Broadband Signal Disambiguation based on Sub-Sampled Analog Optical Links Employing Sample Rate Modulation - A system for measuring an RF input signal frequency includes a sampling optical pulse train with a frequency-dithered repetition-rate, and a sub-sampled analog link coupled to the optical pulse train whereby the RF input signal frequency is determined. This frequency dither imparts well-characterized modulation sidebands onto the input RF signal to be measured. By measuring the amplitude of these sidebands relative to the incoming aliased signal amplitude the frequency of the original signal is readily determined. The use of optical sampling dramatically increases the bandwidth over which the disambiguation technique is applied, and coarse disambiguation is achieved in a single acquisition. | 03-24-2016 |
| 20160094296 | DISTORTION COMPENSATION DEVICE AND COMPENSATION DISTORTION METHOD - A distortion compensation device includes: a signal processing unit to perform signal processing on a symbol; a storage unit to store a distortion compensation value for every pattern string including a symbol of interest and predetermined number of symbols ahead of the symbol of interest among a plurality of input symbols, a distortion in the signal processing unit being compensated for such that the symbol of interest is corrected to a target value based on the distortion compensation value; a first acquisition unit to acquire a pattern string of interest including the current input symbol and the predetermined number of input symbols ahead of the current input symbol; a second acquisition unit to acquire the distortion compensation value associated with the pattern string of interest from the storage unit; and a setting unit to set the distortion compensation value to a correction value of the signal processing unit. | 03-31-2016 |
| 20160105235 | System and Method for Measuring Linewidth of Optical Signal - A system for measuring a linewidth of an optical signal includes an optical sensor determining a set of measurements of the linewidth of the optical signal propagated over different distances. Each measurement corresponds to a different distance, and includes a white frequency modulation (FM) noise and a low frequency FM noise. The system also includes a processor for determining values of the white FM noise and the LF FM noise reducing a difference between the measurements and values of the linewidth of the optical signal calculated for the different distances with the values of the white FM noise and the LF FM noise. | 04-14-2016 |
| 20160112155 | SIGNAL RECEPTION PROCESSING APPARATUS AND METHOD FOR PROCESSING RECEIVED SIGNAL - A signal reception processing apparatus includes a digital signal processing unit that calculates a first Q value based on distribution of the symbols of the demodulated signal and distance between the symbols of the demodulated signal, and an error correction unit that outputs corrected signal as a demodulation electric signal, and calculates a second Q value based on an error rate at the time of the correction, and a control unit that calculates a penalty that indicates degradation quantity of signal quality caused by a nonlinear optical effect of an optical fiber based on the first Q value and the second Q value. | 04-21-2016 |
| 20160127037 | Method And Apparatus For Determining Transmission Quality - A method of determining a transmission quality of a transmission. The method comprises detecting and/or decoding the transmission using an iterative operation, and generating a value of one or more iteration parameter of the iterative operation. The method further comprises calculating the transmission quality based on the value of the one or more iteration parameter. | 05-05-2016 |
| 20160127216 | ENABLING SOFTWARE-DEFINED CONTROL IN PASSIVE OPTICAL NETWORKS - A software-defined passive optical network includes a set of optical network terminals, a set of passive optical network ports, and a plurality of splitters. Each of the optical network terminals is connected to a single one of the passive optical network ports through a given one of the splitters, and the network is divided into a plurality of areas, each of which is assigned a given fraction of the passive optical network ports. Passive optical network port utilization is monitored for each of the plurality of areas; for those of the areas determined to have passive optical network port overutilization, the number of the passive optical network ports assigned thereto is increased; and for those of the areas determined to have passive optical network port underutilization, the number of the passive optical network ports assigned thereto is reduced. | 05-05-2016 |
| 20160134364 | Method and apparatus for providing a differential latency - An apparatus and method for providing a differential latency, DL, between an upstream, US, transmission and a downstream, DS, transmission via an optical transmission link (OTL), said apparatus comprising a measurement unit ( | 05-12-2016 |
| 20160142131 | OPTICAL TRANSMITTER MODULE - An optical transmission device includes a light source, a driver, and a light receiving element. In accordance with electronic signals supplied from a signal line, the light source emits forward a signal light and emits back a monitor light for monitoring the signal light. The driver is disposed behind the light source and supplies the electronic signals to the signal line. The driver has a reflection area that reflects the monitor light in a direction different from a direction in which the monitor light, which is emitted back from the light source in accordance with the electronic signal, travels. The light receiving element receives the monitor light that is reflected on the reflection area of the driver. | 05-19-2016 |
| 20160149637 | TEST AND MEASUREMENT DEVICE FOR MEASURING INTEGRATED COHERENT OPTICAL RECEIVER - Embodiments of the invention include a phase adjustor for adjusting a phase angle of a local oscillator relative to a phase angle of a signal input of a Device Under Test (DUT). Some embodiments include a laser source for a lightwave component analyzer and an optical phase adjustor, which may be embodied by a loop stretcher structured to controllably stretch a length of fiber optic cable, driven by a phase adjust driver. The lightwave component analyzer drives a first test input to the DUT. An output of the DUT drives an output of the optical phase adjustor adapted to couple to an oscillator input to the DUT. A monitor selector is also included that accepts at least two outputs of the DUT and is structured to transmit a selected output of the DUT to the phase adjust driver. The phase adjust driver is structured to drive the optical phase adjustor with a control signal based on the output of the DUT that is selected by the monitor selector. In other embodiments, methods for adjusting a phase angle of a local oscillator relative to a phase angle of a signal input of a Device Under Test (DUT) as well as a system for testing a DUT are presented. | 05-26-2016 |
| 20160149638 | OPTICAL MONITORING IN AN OPTICAL COMMUNICATIONS NETWORK - A communications network element comprises a network element input, a network element output and a monitoring port. An optical splitting device taps a portion of an input optical signal or an output optical signal to form a first signal. An optical signal transforming apparatus applies an optical transfer function to the first signal to form the optical monitoring signal applied to the monitoring port. The optical transfer function preserves the spectral property of the first signal and applies a time-domain obfuscation to the tapped signal. The optical signal transforming apparatus comprises an optical through signal path, an optical splitting device positioned in the optical through signal path and an optical combining device positioned in the optical through signal path. An optical feedback path is connected to the optical splitting device and the optical combining device. The optical splitting device is arranged to tap off a portion of a signal passing along the through signal path and apply it to the feedback path, and the optical combining device is arranged to recombine at least part of the tapped portion of the signal with the signal passing along the through signal path. | 05-26-2016 |
| 20160149647 | OPTICAL TRANSMISSION APPARATUS AND WAVELENGTH CALIBRATION METHOD - An optical transmission apparatus, includes: a reference-wavelength light source configured to generate reference light; a reference wavemeter configured to be calibrated by using the reference light; a receiver configured to receive measurement light transmitted from another optical transmission apparatus and wavelength information about the measurement light; and a controller, wherein the controller configured to: detect error between a first wavelength of the measurement light detected by using the reference wavemeter, and a second wavelength included in the wavelength information; and send error information that represents the error to the another optical transmission apparatus. | 05-26-2016 |
| 20160156411 | TRANSMISSION DEVICE, TRANSMISSION NETWORK SYSTEM, AND PATH DELAY MEASURING METHOD | 06-02-2016 |
| 20160156412 | TRANSMISSION APPARATUS | 06-02-2016 |
| 20160170023 | RELATIVE SPEED MEASURING DOPPLER LIDAR | 06-16-2016 |
| 20160173192 | MANAGING NETWORK ACCESS BASED ON RANGING INFORMATION | 06-16-2016 |
| 20160173196 | SYSTEM AND METHOD FOR NON-CONTACT IDENTIFICATION OF A PASSIVE TARGET | 06-16-2016 |
| 20160191275 | BLIND EQUALIZATION TAP COEFFICIENT ADAPTATION IN OPTICAL SYSTEMS - A method of blind tap coefficient adaptation includes receiving a digital data signal including random digital data, equalizing a first portion of the digital data signal using a first set of predetermined tap coefficients and a second portion of the digital data signal using a second set of predetermined tap coefficients. The method includes generating a first eye diagram and a second eye diagram from a first portion and a second portion of an equalized signal, respectively. The first eye diagram is compared with the second eye diagram to determine which of the sets of predetermined tap coefficients results in a data signal having a higher signal quality. The method includes inputting to an equalizer as an initial set of tap coefficients the first set of predetermined tap coefficients or the second set of predetermined tap coefficients according to the determination. | 06-30-2016 |
| 20160204857 | METHOD AND APPARATUS FOR PROCESSING FOR ALARM CLEARING | 07-14-2016 |
| 20160380696 | METHOD AND APPARATUS FOR MONITORING WAVELENGTH CHANNEL - A method and an apparatus for monitoring a wavelength channel are disclosed. The method includes: performing optical-to-electrical detection on an optical signal on a wavelength channel, to obtain an electrical signal; obtaining a frequency spectrum of the electrical signal; determining a first parameter M according to an equation M=N | 12-29-2016 |
| 20160380857 | MONITORING OF IP MULTICAST DELIVERY OVER AN OPTICAL NETWORK - Apparatus and method for monitoring IP multicast delivery. One embodiment comprises an Optical Line Termination (OLT) device that includes a Network Termination (NT) device that connects to a core network, and a plurality of Line Termination (LT) devices that connect to an optical distribution network. The NT device generates an IP multicast monitoring stream directed to a group address, and transmits the monitoring stream to the LT devices. The LT devices then monitor for packets directed to the group address. When an LT device detects a loss of one or more packets directed to the group address, the LT device reports packet loss for the IP multicast monitoring stream to the NT device. | 12-29-2016 |
| 20170237494 | OPTICAL FIBER-BASED DISTRIBUTED ANTENNA SYSTEMS, COMPONENTS, AND RELATED METHODS FOR CALIBRATION THEREOF | 08-17-2017 |
| 20170237639 | DELAY MEASURING DEVICE, MEASUREMENT OBJECT DEVICE AND COMMUNICATION SYSTEM | 08-17-2017 |
| 20180026717 | LOSS OF SIGNAL DETECTOR | 01-25-2018 |
| 20180027376 | Configurable Computing Resource Physical Location Determination | 01-25-2018 |
| 20190149235 | Downstream Node Setup | 05-16-2019 |
| 20190149246 | QUANTUM COMMUNICATION LINK ROBUST AGAINST PHOTON LOSS | 05-16-2019 |
| 20190149898 | TRANSMISSION METHOD FOR AN OPTICAL BURST TRANSPORT NETWORK, SLAVE NODE, AND COMPUTER STORAGE MEDIUM | 05-16-2019 |
| 20220140908 | AUTOMATIC NEGOTIATION OF OPTICAL TRANSCEIVER CONFIGURATION PARAMETERS - Techniques for negotiating optical configuration parameters of transceivers are disclosed. In one example, a method may include outputting, by a first optical node to a second optical node, a negotiation request message that specifies a configuration parameter setting for optical transceivers, the setting comprising one of a speed, a forward error correction (FEC) scheme, a modulation type, a transmission power, a minimum central frequency, a maximum central frequency, a minimum input power, a maximum input power, or a signal-to-noise ratio threshold; receiving, by the first optical node from the second optical node, in response to the negotiation request message, a negotiation response message including an indication of support for the configuration parameter setting; and configuring, by the first optical node, in response to the indication of support, a configuration parameter of an optical transceiver for the first optical node with the configuration parameter setting for the configuration parameter. | 05-05-2022 |
