| Entries |
| Document | Title | Date |
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| 20080226290 | OPTICAL SIGNAL MONITORING APPARATUS, OPTICAL SYSTEM AND OPTICAL SIGNAL MONITORING METHOD - By reducing the number of PD arrays, and by simplifying the configuration of an optical power monitor in a WDM system, a miniaturized, cost reduced optical signal monitoring apparatus, optical system or optical signal monitoring method is provided. An optical power monitor | 09-18-2008 |
| 20080226291 | OPTICAL RECEIVING APPARATUS AND OPTICAL LEVEL ADJUSTED QUANTITY SETTING METHOD THEREFOR - The present invention relates to an optical receiving apparatus designed to receive light wavelength-demultiplexed in a wavelength multiplex optical transmission system. The optical receiving apparatus includes an optical level adjusting unit for adjusting a level of light inputted and for outputting the level-adjusted light and a light receiving unit for receiving the light outputted from the optical level adjusting unit. An optical level adjusted quantity in the optical level adjusting unit is set so that the level of light of relatively shorter wavelength band becomes lower than the level of light of relatively longer wavelength band. This enables normal signal light reception to be achieved irrespective of a variation in the number of wavelengths with a simple configuration. | 09-18-2008 |
| 20080232798 | LOSS-OF-LIGHT DETECTING APPARATUS - According to an aspect of an embodiment, an apparatus comprises: a correction level calculating unit that calculates a correction level, which is the input light level necessary to meet an optical signal-to-noise ratio at the maximum level of an optical noise signal; a loss-of-light detection threshold-value setting unit that compares the correction level with an initial threshold value to set a loss-of-light detection threshold value used in detection of any loss of light on the basis of the comparison result; and a loss-of-light detecting unit that compares the level of an input optical signal with the loss-of-light detection threshold value to determine that any loss of light is caused if the level of the input optical signal is lower than the loss-of-light detection threshold value. | 09-25-2008 |
| 20080253762 | Method and system for performance monitor for digital optical DWDM networks - A system for performance monitoring for a DWDM network. The system includes a photonic integrated device configured to receive an optical signal and output a first plurality of electrical signals for a plurality of channels respectively. The system also includes a clock and data recovery device configured to receive the first plurality of electric signals. Additionally, the system includes a switch device coupled to the first clock and data recovery device without an error correction device in between. The switch includes a first interface to output a second plurality of electrical signals and a second interface to add or drop one or more channel devices. The switch also includes an output port configured to provide information associated with the plurality of channels. An error detection device is coupled to the output port and is configured to monitor and report performance of the channels. | 10-16-2008 |
| 20080253763 | OPTICAL TRANSMISSION APPARATUS - An optical transmission apparatus is arranged by: means for demultiplexing monitoring light for received wavelength-multiplexed signal light so as to detect optical intensity of the monitoring light; means for detecting optical intensity of wavelength-multiplexed signal light after the monitoring light has been demultiplexed therefrom; a gain controlling type optical amplifier for amplifying the wavelength-multiplexed signal light; an optical attenuating unit for adjusting optical intensity of the amplified wavelength-multiplexed signal light; and a monitoring control unit for controlling the gain controlling type optical amplifier in such a manner that the gain of the optical amplifier becomes constant, and for controlling an attenuating amount of the optical attenuating unit in such a manner that the optical intensity of the wavelength-multiplexed signal light becomes a predetermined target value. | 10-16-2008 |
| 20090022491 | LIGHT COLLECTING DEVICE AND SINGLE-PHOTON GENERATION DEVICE - A light collecting device is disclosed that is able to couple light from a light emission structure to an optical fiber at low loss. The light collecting device includes an excitation light source for emitting excitation light to an optical fiber; a light condensing optical system which condenses the excitation light from the optical fiber to a light emission structure, and directs light reflected in the light emission structure and light generated in the light emission structure back to the optical fiber; a reflecting light detector for detecting intensity of the reflected light; a first optical divider for dividing the emission light and the reflected light based on their wavelengths, directing the emission light to the optical fiber, and propagating the reflected light to the excitation light source; a second optical divider arranged close to the excitation light source for propagating the excitation light to the first optical divider, and propagating the reflected light to the reflecting light detector; a position controller for controlling a light condensing position of the excitation light to be irradiated to the light emission structure; a unit for scanning the light condensing position of the excitation light, and acquiring a relationship of intensity of the reflected light and the light condensing position of the excitation light; and a unit for optimizing the light condensing position based on the intensity of the reflected light and the light condensing position of the excitation light. | 01-22-2009 |
| 20090041456 | Wavelength division multiplex signal monitoring system and wavelength division multiplex transmission device equipped with the same - A WDM signal monitoring system includes a measuring unit that measures power levels in a plurality of predetermined wavelength bands about a wavelength division multiplex signal, a waveform determination unit that determines an approximate waveform of each channel from each bit rate and modulation system of a plurality of channels which forms a wavelength division multiplex signal, and an approximation unit that determines a power level and a wavelength of each channel by approximating the power level in a plurality of wavelength bands which the measuring unit measured with the approximate waveform of each channel which the waveform determination unit determined. | 02-12-2009 |
| 20090052892 | Communication Network with Co-Routed Multi-Channel Traffic - Embodiments of the present invention route a wavelength division multiplexed signal across multiple communication paths using skew characteristics of at least some of the communication paths. The network is a wavelength division multiplexed optical transport network. The plurality of communication paths involves different signal and path attributes such as a plurality of carrier wavelengths, optical carrier groups, physical communication paths (different nodes, different fibers along a same path, or any combination of the foregoing), or any other differentiating factors between two paths. | 02-26-2009 |
| 20090060499 | APPARATUS AND METHOD FOR MONITORING QUALITY OF OPTICAL SIGNAL - An apparatus and method for monitoring quality of an optical signal in an optical network based on wavelength division multiplexing optical transmission technology are provided, which are capable of monitoring the quality of an optical signal with higher accuracy. The apparatus includes: a signal extractor extracting an optical signal having a specific wavelength from input optical signals; an optical-electrical converter converting the extracted optical signal having the specific wavelength into an electrical signal; an overhead parser extracting a part of an overhead of the electrical signal to parse whether or not the quality of the signal is degraded; and a controller monitoring the quality of the optical signal according to the parsing result of the extracted overhead and restoring the optical signal whose quality is lower than a predetermined reference value. | 03-05-2009 |
| 20090080883 | Systems and Methods for Polarization Mode Dispersion Mitigation - In one exemplary embodiment, a method comprises transmitting an optical signal via the optical line, measuring a relative change in spectral intensity of the optical signal near a clock frequency (or half of that frequency) while varying a polarization of the optical signal between a first state of polarization and a second state of polarization, and using the relative change in spectral intensity of the optical signal to determine and correct the DGD of the optical line. Another method comprises splitting an optical signal traveling through the optical line into a first and second portions having a first and second principal states of polarization of the optical line, converting the first and second portions into a first and second electrical signals, delaying the second electrical signal to create a delayed electrical signal that compensates for a DGD of the optical line, and combining the delayed electrical signal with the first electrical signal to produce a fixed output electrical signal. | 03-26-2009 |
| 20090162054 | COLLECTION OF DATA FROM AN OPTICAL CHANNEL MONITOR WITHOUT CAUSING A MALFUNCTION OF A TRANSMISSION APPARATUS - A method of collecting data from an optical channel monitor for monitoring the power of a wavelength-division multiplexed light signal at each wavelength is disclosed. The total light power is analog-to-digital converted by an A/D converter. The data of the total light power which has been analog-to-digital converted is compared with a reference light power by a comparator for each conversion, and when the difference between the total light power and the reference light power exceeds a predetermined threshold, a power fluctuation flag is turned ON. After the comparison, the above process of the analog-to-digital conversion and the comparison is iterated until the optical channel monitor completes the data collection for each wavelength. Thereafter, the processor determines whether the power fluctuation flag is ON or not. When the power fluctuation flag is ON, the processor discards the currently collected data and maintains the data which were collected immediately before. | 06-25-2009 |
| 20090257746 | OSS Support for Control Plane Technology - The OSS provides unique and automated provisioning, activation, fallout management and monitoring of SONET and WDM networks comprising control plane mesh and traditional SONET/WDM Rings/Chains. Resource discovery and dynamic provisioning provides for increased use of network bandwidth. It is possible both all control plane networks and mixed control plane and traditional networks. Network connections or the network topology may be accomplished in a hop-by-hop manner. | 10-15-2009 |
| 20090257747 | TESTING A FIBER LINK IN A COMMUNICATION SYSTEM WITHOUT INTERRUPTING SERVICE - There is provided a method for testing an optical fiber link. The method includes employing a wavelength division multiplexer (WDM) to receive a signal via a port of the WDM and multiplex the signal onto the optical fiber link. The signal is used in a test of the optical fiber link. There is also provided an arrangement of components for testing the fiber link. | 10-15-2009 |
| 20090269057 | WAVELENGTH ROUTE SELECTION SYSTEM AND WAVELENGTH ROUTE SELECTION METHOD - A wavelength route selection system includes an inhibition route setting unit determining, for each of the spans, whether or not the span reliability exceeds the upper limit value, and extracting, as second wavelength routes, routes based on spans, the span reliability of which is determined to exceed the upper limit value, from among wavelength routes from the node device as the start point to the node device as the end point. The system further includes a route reliability calculation unit adding, for each of the second wavelength routes extracted by the inhibition route setting unit, the span reliabilities of all the spans in the corresponding second wavelength route calculated so as to calculate a wavelength route reliability representing the reliability of the second wavelength route. The system further includes a route selection unit selecting a second wavelength route having a minimum wavelength route reliability calculated by the route reliability calculation unit from among the second wavelength routes as the first wavelength route. | 10-29-2009 |
| 20090279887 | Systems and Methods For Wavelength Scanning Of In-Service Wavelength Division Multiplexing Systems - A testing input module for testing an in-service WDM system is provided. The testing input module includes a first light source configured to emit a first light signal to one or more empty channels of the in-service WDM system; and a tunable second light source configured to emit a second light signal to test the one or more empty channels. The testing input module also includes a first switch module configured to: receive from the first light source and output the first light signal during a first time interval; and receive from the second light source and output the second light signal during a second time interval. The second time interval is a duration wherein a channel power monitoring function of the in-service WDM system is not triggered. | 11-12-2009 |
| 20090297143 | Optical transmission apparatus and optical attenuation amount control method - In an optical transmission apparatus, levels of signal lights obtained by demultiplexing a WDM signal and corresponding to channels are detected, based on which a channel in which a signal is transmitted and a channel in which no signal is transmitted are determined. An attenuation amount of a channel in which no signal is transmitted in a predetermined range from the channel in which the signal is transmitted is set to a value equal to an attenuation amount of the channel in which the signal is transmitted. An attenuation amount of a channel in which no signal is transmitted out of the predetermined range from the channel in which the signal is transmitted is set to a value larger than the attenuation amount of the channel in which the signal is transmitted. The signal lights are attenuated based on the values and multiplexed. | 12-03-2009 |
| 20090304381 | System and method for configuration discovery in an optical network - A system and method for discovering configuration errors in an optical network is disclosed. The neighbors of each node are discovered. An information model of the optical network is formed, which may be used to determine configuration errors. In one embodiment, each node exchanges node identification messages with neighboring nodes to discover its neighbors, publishes the node neighbor information to the optical network, and forms its own information model from the node neighbor information published by the nodes. | 12-10-2009 |
| 20090324219 | APPARATUS AND METHOD FOR IMPROVING THE TOLERANCE OF TONE-BASED OPTICAL CHANNEL MONITORING TO STIMULATED RAMAN SCATTERING - For wavelength division multiplexing (WDM) communications, apparatus and methods are provided for performing tone-based optical channel monitoring that is less sensitive to stimulated Raman scattering (SRS). In tone-based optical channel monitoring, in which WDM channels are modulated with one or more tones, detecting and measuring the tone power is commonly used as a measure of signal power in each channel. In WDM systems with long fiber spans and high signal powers, however, SRS tends to transfer energy from shorter wavelengths to longer wavelengths, whereby the tones are no longer accurately indicative of the signal power of the individual wavelength channels. Apparatus and methods are provided which reduce the effect of SRS by filtering the monitored WDM signals into sub-bands and detecting each sub-band independently. | 12-31-2009 |
| 20100040366 | Method and apparatus for displaying and identifying available wavelength paths across a network - Due to demand for more network bandwidth, a need for multi-user optical network topologies has, and will continue to, increase. A method or corresponding apparatus in embodiments of the present invention provide for an availability determination tool for determining and displaying wavelength and subrate availabilities within a network. Benefits of embodiments of a tool include allowing a user to identify the availability and capacity of any wavelength on any network, via an interactive graphical user interface, such as by using three-dimensional representations. In one embodiment, the disclosed availability determination tool allows users to locate and view any combination of available wavelengths between nodes in an optical network topology, and generate graphical and tabular reports of the availability in order to maintain an efficient and organized method or apparatus for determining and controlling wavelengths in a network. Consequently, service providers using the tool can keep performance rates high and costs low. | 02-18-2010 |
| 20100046944 | OPTICAL CHANNEL MONITOR - A method of monitoring a WDM optical signal is provided. The method includes: receiving a WDM optical signal having a plurality of channels; detecting the optical signal after filtering the WDM optical signal with a tunable filter; and reconfiguring at least the center wavelength and bandwidth of the tunable filter optical transfer function to determine a signal performance parameter of the WDM optical signal. | 02-25-2010 |
| 20100150550 | TRANSMISSION METHOD OF WDM LIGHT AND WDM OPTICAL TRANSMISSION SYSTEM - According to the WDM optical transmission system, for optical signals of respective wavelength in a WDM light propagated through a transmission path, a spectrum component at a center wavelength of each optical signal and a spectrum component in the vicinity of the center wavelength thereof are selectively attenuated by a spectrum correction optical filter, so that the WDM light is transmitted in a state where intensity of sideband components in the spectrum of each optical signal is relatively increased. As a result, even if spectrum width of the optical signal of each wavelength is limited when the WDM light passes through the band-limiting device on the transmission path, degradation of transmission characteristics caused by the attenuation of sideband components is reduced. | 06-17-2010 |
| 20100150551 | OPTICAL ADD/DROP MULTIPLEXING SYSTEM, OPTICAL ADD/DROP MULTIPLEXER AND OPTICAL PATHWAY DETOUR PROGRAM - If opening and deleting of arbitrary optical pathways are repeated in a configuration where plural OADM nodes are connected to each other in a ring manner, empty waves in the ring are fragmented, and thus, it is necessary to optimize the optical pathways. When an optical pathway is opened from an OADM node to a different OADM node, transponders capable of connecting two routes to the OADM nodes and of setting different wavelengths for two routes are mounted in a state where there are no empty waves on a part of the route, so that an already-opened optical pathway is detoured to a detour route or a different wavelength in the OADM ring, and continuous empty waves are produced in a section to be opened so as to open a new optical pathway. | 06-17-2010 |
| 20100183299 | Wavelength Assignment In An Optical WDM Network - The path selection and wavelength assignment to a selected path are performed by mapping the wavelength reach to the demand distribution (agile reach) resulting in a 50-60% increase in the network reach. The network reach is further increased (about 2.2 times) when on-line measured performance data are used for path selection and wavelength assignment. The connections may be engineered/upgraded individually, by optimizing the parameters of the entire path or of a regenerator section of the respective path. The upgrades include changing the wavelength, adjusting the parameters of the regenerator section, controlling the launch powers, mapping a certain transmitter and/or receiver to the respective wavelength, selecting the wavelengths on a certain link so as to reduce cross-talk, increasing wavelength spacing, etc. | 07-22-2010 |
| 20100220997 | OPTICAL SIGNAL PROCESSING DEVICE AND METHOD OF PROCESSING OPTICAL SIGNAL - An optical signal processing device for shaping a waveform of an optical signal, including: an intensity inversion wavelength converter configured to generate an intensity-modulated optical signal of a second wavelength obtained by inverting a signal intensity of an input intensity-modulated optical signal of a first wavelength; an optical coupler configured to multiplex the intensity-modulated optical signal of the first wavelength and the intensity-modulated optical signal of the second wavelength at a timing at which signal intensities of those signals become opposite; and an optical limiter configured to input coupled light output from the optical coupler, and suppress gain as power of the coupled light becomes higher. | 09-02-2010 |
| 20100220998 | Network management system, repeater, and repeating method - A repeater includes a reception part configured to receive an optical signal transmitted by wavelength division multiplexing from a preceding repeater in a path from a source to a destination; a determination part configured to determine the channel allocation of the signal received by the reception part by determining a bit rate and a modulation technique with respect to each of channels in the received signal; and a detection part configured to detect a prohibited channel not to be included in the optical signal to be transmitted from the repeater, based on the channel allocation and a predetermined criterion. | 09-02-2010 |
| 20100220999 | Encoding of Wavelength Converter Systems - An apparatus comprising a path computation element (PCE) configured to perform a path computation using a wavelength converter (WC) pool information based on a dynamic WC pool model, wherein the dynamic WC pool model comprises information regarding WC pool usage state represented using a WC pool usage state vector, and wherein the information regarding WC pool usage state is communicated to the PCE using a WC usage state Type-Length-Value (TLV) that indicates an available WC in a WC pool, a used WC in the WC pool, or both. Also disclosed is a network component comprising at least one processor configured to implement a method comprising receiving a WC usage state TLV comprising information regarding WC pool usage state, establishing a WC pool usage state vector using the information in the WC usage state TLV, and calculating a WC pool connectivity matrix based on the WC usage state vector. | 09-02-2010 |
| 20100232790 | MAXIMIZING CAPACITY OF WAVELENGTH DIVISION MULTIPLEXING PASSIVE OPTICAL NETWORKS - Technologies are generally described for substantially maximizing capacity in a wavelength division multiplexing (WDM) passive optical network (PON). An “achievable rate region” may be defined as a set containing admissible traffic rates of a given WDM PON system such that a volume of an achievable rate region is proportional to a capacity of the network. Deriving the achievable rate region for a particular network, decisions may be made whether incoming traffic rate can or cannot be achieved for that network. Moreover, the achievable rate region may be used to construct a WDM PON utilizing a minimum number of wavelengths, a minimum number of lasers with narrowest tuning ranges, and a minimum number of receivers, thereby reducing a capital expenditure in building the PON system. | 09-16-2010 |
| 20100239246 | WAVELENGTH AND POWER MONITOR FOR WDM SYSTEMS - Consistent with the present disclosure, a transmitter is provided that includes first and second stages of wavelength locking circuitry. The first stage includes a tunable optical filter that sweeps through the spectrum of a WDM signal at a predetermined rate. A first photodiode senses a tapped portion of the output of the tunable filter. The remaining light is fed to the second stage, which includes a second optical filter, typically having a fixed transmission characteristic. A second photodiode senses the light that passes through the second filter. By sweeping the WDM spectrum the tunable filter can be used to identify the peaks in the WDM spectrum, with each peak corresponding to an optical signal wavelength and occurring at a particular time interval during the sweep. Thus, each optical signal wavelength can be associated with a particular time interval in the sweep, and, if no peak is identified during the sweep, a fault can be identified as either a laser failure or that the optical signal wavelength has drifted or “hopped” to another optical signal wavelength. Once having identified that an optical signal has hopped, the optical source outputting that optical signal can be appropriately controlled to output light at the correct wavelength. | 09-23-2010 |
| 20110052188 | METHODS AND SYSTEMS FOR OPTIMAL LAUNCH POWER COMPUTATION IN MESHED OPTICAL NETWORKS - The present invention provides methods and systems for efficiently computing optimal optical launch powers for meshed optical networks. The present invention can be utilized to find optimal launch powers for multiple wavelengths in a meshed dense-wave division multiplexed (DWDM) system. Generally, the present invention ensures Q exceeds a threshold for OSNR, and then the launch powers are optimized based on nonlinear penalties. If Q is below the threshold, DWDM equipment changes/additions are incorporated to provide adequate OSNR. The present invention provides a computationally efficient mechanism to optimize launch powers in 10 Gb/s, 40 Gb/s, 100 Gb/s, etc. highly-meshed optical networks. | 03-03-2011 |
| 20110085798 | METHOD AND DEVICE FOR MONITORING WDM SIGNAL LIGHT - A WDM signal light monitoring device includes a first monitor for monitoring input-side WDM main signal light and output-side WDM main signal light for each wavelength; and a second monitor for monitoring the first monitor by comparing a monitoring result received from an upstream WDM transmission device with a monitoring result of the first monitor, wherein the monitoring result of the first monitor is transmitted to a downstream WDM transmission device in the system. | 04-14-2011 |
| 20110110660 | COHERENT OPTICAL CHANNEL SUBSTITUTION - In an optical data transmission system, one channel is removed from a group of wavelength division multiplexed optical channels and another channel carrying different information at the same wavelength is inserted in its place. The process occurs by adding an optical signal whose electric field is the difference between the electric field of the new and old channels. The difference calculation takes into account the phase of the incoming WDM channel and phase of the laser source of the difference signal. The method has applications in optical transmission networks as add-drop nodes and optical regenerators, for generation of high bandwidth optical signals, and for secret optical communications. | 05-12-2011 |
| 20110129216 | Tunable optical filters - The specification describes tunable optical filters improved according to the invention by designing the optical system architecture to provide a double pass of the signal being analyzed through the tunable optical filter. The benefit of double passes through the tunable optical filter is narrower linewidth and better adjacent and non-adjacent channel isolation. The invention may be implemented with any tunable optical filter which is reciprocal. The optical system architecture is preferably an optical performance monitor for a WDM system. | 06-02-2011 |
| 20110135301 | Wavelocker for Improving Laser Wavelength Accuracy in WDM Networks - The present invention includes novel techniques, apparatus, and systems for optical WDM communications. Various wavelocker apparatus and methods are disclosed that measure the frequency offsets between signal lasers and reference lasers. The measured offsets are used to adjust the signal laser frequencies to meet their target frequencies. The absolute accuracy of the reference laser frequency is improved by measuring the absorption of the reference laser by a gas cell with known fixed absorption lines versus the reference laser frequency. Apparatus and methods are disclosed to cover scenarios in which the reference laser polarization is aligned with the signal lasers, as well as those in which the reference laser polarization is not aligned with the signal lasers. The wavelocker apparatus may or may not be located at the same network site as the signal lasers. | 06-09-2011 |
| 20110142445 | Systems and Methods for Polarization Mode Dispersion Mitigation - In one exemplary embodiment, a method comprises transmitting an optical signal via the optical line, measuring a relative change in spectral intensity of the optical signal near a clock frequency (or half of that frequency) while varying a polarization of the optical signal between a first state of polarization and a second state of polarization, and using the relative change in spectral intensity of the optical signal to determine and correct the DGD of the optical line. Another method comprises splitting an optical signal traveling through the optical line into a first and second portions having a first and second principal states of polarization of the optical line, converting the first and second portions into a first and second electrical signals, delaying the second electrical signal to create a delayed electrical signal that compensates for a DGD of the optical line, and combining the delayed electrical signal with the first electrical signal to produce a fixed output electrical signal. | 06-16-2011 |
| 20110182576 | Method For Engineering Connections In A Dynamically Reconfigurable Photonic Switched Network - A method for engineering of a connection in a WDM photonic network with a plurality of flexibility sites connected by links comprises calculating a physical end-to-end route between a source node and a destination node and setting-up a communication path along this end-to-end route. An operational parameter of the communication path is continuously tested and compared with a test threshold. The path is declared established whenever the operational parameter is above the margin tolerance. The established path is continuously monitored by comparing the operational parameter with a maintenance threshold. A regenerator is switched into the path whenever the operational parameter is under the respective threshold, or another path is assigned to the respective connection. An adaptive channel power turn-on procedure provides for increasing gradually the power level of the transmitters in the path while measuring an error quantifier at the destination receiver until a preset error quantifier value is reached. As the connection ages, the power is increased so as to maintain the error quantifier at, or under the preset value. The path operation is controlled using a plurality of optical power/gain control loops, each for monitoring and controlling a group of optical devices, according to a set of loop rules. | 07-28-2011 |
| 20110200327 | OPTICAL SIGNAL IDENTIFYING OR DETECTING METHOD AND APPARATUS, AND IDENTIFYING AND DETECTING SYSTEM - An optical signal identifying method and apparatus are provided. The optical signal identifying method includes: assigning signal IDs with different frequencies to optical signals with different wavelengths, where the signal IDs are controlled in an amplitude-modulation manner according to a binary data sequence; and distinguishing the optical signals with different wavelengths by using different signal IDs. A signal ID detecting method and apparatus, and an optical signal identifying and detecting system are further provided. The optical signals with different wavelengths are distinguished by using the signal IDs controlled in an amplitude-modulation manner according to the binary data sequence, and optical channels of the optical signals with different wavelengths are detected and information such as the optical power is obtained by detecting the signal IDs. Therefore, the number of the identification frequencies of the signal IDs required to distinguish the optical signals is small, and the complexity of detecting the signal IDs is reduced. | 08-18-2011 |
| 20110211830 | OPTICAL COMMUNICATION APPARATUS AND OPTICAL ADD/DROP APPARATUS - An apparatus comprising an optical modulator modulating a light in accordance with a modulation signal and an operating point of the optical modulator, to thereby output a modulated optical signal; and a controller controlling the operating point in accordance with a branched portion of the modulated optical signal and a detected intensity of the modulation signal so that the operating point is kept stable when the detected intensity falls below a predetermined value. | 09-01-2011 |
| 20110211831 | WAVELENGTH DIVISION MULTIPLEXING TRANSMISSION APPARATUS FOR CONTROLLING THE WAVELENGTH OF AN FBTL OPTICAL MODULE, AND WAVELENGTH CONTROL METHOD EMPLOYED FOR WAVELENGTH DIVISION MULTIPLEXING TRANSMISSION APPARATUS EQUIPPED WITH THE FBTL OPTICAL MODULE - Provided is a wavelength division multiplexing transmission apparatus that enables operation control of transponders each carrying an FBTL optical module from the monitoring control unit by the same operation control as one for the transponders each carrying an NB optical module with four wavelengths assigned. For that purpose, the wavelength division multiplexing transmission apparatus includes the transponders for converting optical signals from wideband wavelengths to narrowband wavelengths, and a monitoring control unit for controlling the transponders by instructions from an operator. Each transponder includes (i) an assigned wavelength determining unit for converting channel information specified by the monitoring control unit into assigned wavelength information assigned to the transponder, and (ii) a full-band tunable laser (FBTL) module control unit for performing control in such a manner as to cause a full-band tunable laser (FBTL) to emit based on the assigned wavelength information after conversion by the assigned wavelength determining unit. | 09-01-2011 |
| 20110229129 | Tunable Dense Wavelength Division Multiplexing Transceiver, Circuits and Devices Therefor, and Methods for Making and Using Such Transceivers, Circuits and Devices - The disclosure relates to a tunable 50 GHz and 100 GHz channel spacing DWDM transceiver, and methods of making and using the same. The transceiver comprises an electro-absorption modulation laser (EML), a system board configured to compare a preset wavelength with an actual emission wavelength of the EML, a microcontroller and one or more associated registers configured to communicate with the system board, a temperature controlling circuit configured to stabilize the actual emission wavelength of the EML; and a wavelength meter connected to the output of the EML and having an output connected to the system board. The system board may be configured to provide a feedback loop from the EML to the microcontroller. The transceiver, suitable for 50 GHz channel spacing standards, can be made from existing standard transceivers and can switch between 50 GHz and 100 GHz channel spacing modes. | 09-22-2011 |
| 20110236017 | Methods and Devices for Wavelength Alignment in WDM-PON - An optical network unit for a passive optical network ( | 09-29-2011 |
| 20110268439 | Selecting an Optical Path for a New Connection with the Minimum Number of Optical Regenerators - Techniques are provided for receiving a connection request at a first network node configured to request a connection from the first network node to a second network node. At the first network node, it is determined if a path to the second network node without an optical regenerator is available for the connection. In response to determining that a path without an optical regenerator is not available, a path to the second network node is determined that has a minimum number of optical regenerators. The connection is set up using the path with the minimum number of optical regenerators. | 11-03-2011 |
| 20110286741 | APPARATUS AND METHOD FOR MONITORING STATISTICAL CHARACTERISTICS OF PHASE NOISES, AND COHERENT OPTICAL COMMUNICATION RECEIVER - This invention relates to an apparatus and a method for monitoring statistical characteristics of phase noises, as well as to a coherent optical communication receiver. The apparatus for monitoring statistical characteristics of phase noises comprises an argument calculating unit ( | 11-24-2011 |
| 20110305452 | OPTICAL SIGNAL DETECTING DEVICE AND OPTICAL SIGNAL DETECTION METHOD - An optical signal detecting device and an optical signal detection method which can detect true signal strength from a signal including a noise are provided. | 12-15-2011 |
| 20110317999 | WAVELENGTH DIVISION MULTIPLEX DEVICE, WAVELENGTH DIVISION MULTIPLEX TRANSMISSION SYSTEM, AND WAVELENGTH MULTIPLEX SIGNAL CONTROL METHOD - To provide a wavelength division multiplex device capable of detecting an abnormality in counting of a wavelength number of a wavelength multiplex signal transmitted and received between two opposing devices. When a comparison result of a wavelength number information comparison unit | 12-29-2011 |
| 20120002962 | WDM SIGNAL LIGHT MONITORING APPARATUS, WDM SYSTEM AND WDM SIGNAL LIGHT MONITORING METHOD - A WDM signal light monitoring apparatus includes an optical delay interference circuit, a demultiplexer and a determiner. The optical delay interference circuit demultiplexes a phase-modulated WDM signal light, gives a delay difference to the demultiplexed WDM signal lights, then multiplexes the demultiplexed WDM signal lights, and thereby generates an intensity-modulated WDM signal light. The demultiplexer demultiplexes the intensity-modulated WDM signal light into signal lights of respective channels, and outputs the demultiplexed signal lights. The determiner determines the presence or absence of the signal light of each of the channels, based on the signal lights outputted from the demultiplexer. | 01-05-2012 |
| 20120002963 | OPTICAL RELAY SYSTEM AND NETWORK CONTROL DEVICE - Provided is an optical relay system ( | 01-05-2012 |
| 20120008941 | OPTICAL CHANNEL MONITOR AND METHOD OF CALCULATING SIGNAL LIGHT LEVEL OF OPTICAL CHANNEL MONITOR - An optical channel monitor, includes: a wavelength demultiplexer that demultiplexes input signal light; photodetectors that are arranged on a demultiplexed side of the wavelength demultiplexer, and receive light in a wavelength band wider than a wavelength band of the signal light; and a calculator that calculates a light level of signal light of each wavelength by means of linear compensation on the basis of a received light level of light in the wavelength band of the signal light and a received light level of light of a wavelength outside the wavelength band of the signal light at the photodetectors. | 01-12-2012 |
| 20120008942 | OPTICAL SIGNAL CORRECTION APPARATUS AND OPTICAL SIGNAL CORRECTION METHOD - An optical signal correction apparatus includes a power information generation unit that generates power information indicating power of optical main signal in wavelength band according to optical wavelength multiplexed signal, a power information adjusting unit that generates adjusted power information obtained by adjusting the power information according to the number of the optical main signal included in the wavelength band based on optical signal identifying information which identifies the number of the optical main signal in the wavelength band, a correction amount calculation unit that calculates a tilt amount of the optical wavelength multiplexed signal according to the adjusted power information, and a correction amount for correcting a tilt of the optical wavelength multiplexed signal according to a difference between the calculated tilt amount and a target tilt amount, and an optical signal correction unit that corrects the tilt of the optical wavelength multiplexed signal according to the correction amount. | 01-12-2012 |
| 20120014692 | SYSTEM AND METHOD FOR CROSS-PHASE MODULATION NOISE REDUCED TRANSMISSION IN HYBRID NETWORKS - In one embodiment, a method for receiving optical signals includes receiving a first set of one or more signals and a second set of one or more signals, determining a block length used to process the first set of signals, and processing the first set of signals using the block length. The first set of signals and the second set of signals are separated by a guard band. The block length is based upon the width of the guard band. | 01-19-2012 |
| 20120014693 | Passive Optical Network with Adaptive Filters for Upstream Transmission Management - A wavelength division multiplexing passive optical network (WPON) comprising an optical line terminal (OLT) and a plurality of optical network units (ONUs) coupled to the OLT via a power optical splitter. The OLT is configured to monitor wavelengths in use by the ONUs and to divide upstream traffic from the ONUs into multiple channels using tunable filters. Also disclosed is an OLT for a PON, the OLT comprising a plurality of receivers and a plurality of tunable filters corresponding to each of the receivers. The OLT also comprises channel control logic coupled to the tunable filters, wherein the channel control logic is configured to detect a plurality of wavelengths in use for upstream traffic in the PON and to divide the upstream traffic into multiple channels using the tunable filters. Included is a method for managing upstream traffic in a PON, the method comprising monitoring, by a processor, wavelengths in use for upstream traffic in the PON. The method also comprises dividing the upstream traffic into multiple channels using tunable filters. | 01-19-2012 |
| 20120063774 | PASSIVE OPTICAL NETWORK SYSTEM - When an ONU accommodating range is enlarged, and ONUs shorter and ONUs longer in a communication path to an OLT are accommodated in a PON at the same time, there is a need to change a light intensity at the time of transmitting a downstream signal in order that both of the ONUs receive a downstream signal from the OLT. When a near-end ONU receives a signal having a light intensity necessary to communicate between the OLT and a far-end ONU, there arises such a problem that the light intensity is as high as an ONU receiver fails. In order to eliminate the ONU failure of the above problem, prior to transmission of the downstream signal, a downstream signal transmission schedule (downstream light intensity map) is notified to all of the ONUs. An optical transceiver of the OLT has a function of adjusting an output light intensity, and adjusts the light intensity to values receivable by the individual ONUs when the signal arrives at the respective ONUs according to route distances to the respective ONUs. | 03-15-2012 |
| 20120063775 | Setting Optical Power for an Optical Communications Network Channel - A method of determining a power correction factor for an optical power of an optical channel of a wavelength division multiplexed communications network. The method comprises configuring an optical source of the communications network to generate an unmodulated optical carrier signal for the optical channel. The method further comprises determining the optical power of the unmodulated optical carrier signal (P | 03-15-2012 |
| 20120087655 | Direct Laser Modulation - An apparatus includes an array of lasers, an array of electrical drivers, and optical filter. Each laser is configured to produce light in a corresponding wavelength-channel, wherein the wavelength-channels of different ones of the lasers are different. The electrical drivers are connected to directly modulate the lasers. Each driver produces a first driving current or voltage to cause a corresponding one of the lasers to be in a first lasing state and produces a different second driving current or voltage to cause the corresponding one of the lasers to be in a different second lasing state. The optical filter is connected to receive light output by the lasers. The optical filter selectively attenuates light from each of the lasers in the first lasing states thereof and to selectively pass light from each of the lasers in second lasing states thereof. | 04-12-2012 |
| 20120121255 | OPTICAL SWITCHING DEVICE AND COMMUNICATIONS SYSTEM - An optical switching device includes a optical add/drop multiplexer that at least adds an optical signal into and/or drops an optical signal from wavelength division multiplexed light that is wavelength division multiplexed optical signals; a plurality of amplifiers that are disposed on optical paths included in the optical add/drop multiplexer and that can use supplied pump light to amplify the optical signals; an optical source that generates the pump light; and an optical switch that supplies the generated pump light to any one of the amplifiers. | 05-17-2012 |
| 20120121256 | OPTICAL TRANSMISSION DEVICE, OPTICAL TRANSMISSION SYSTEM AND OPTICAL TRANSMISSION METHOD - An optical transmission device includes an extractor that extracts respective optical signals from optical signals multiplexed from a plurality of optical signals of different wavelengths, a detector that detects wavelengths of the extracted respective optical signals, a storage that stores the wavelengths of the detected respective optical signals, and a processor that is operative to derive trends in wavelength variation of the respective optical signals based on the detected respective optical signals and the respective optical signals stored in the storage, and determines that either one or both of the extractor and the detector cause the wavelengths to be varied when the trends in wavelength variation of two or more wavelengths are the same. | 05-17-2012 |
| 20120121257 | PRE-EMPHASIS CONTROL METHOD AND OPTICAL TRANSMISSION SYSTEM - A pre-emphasis control method includes calculating an average value of transmission characteristics based on transmission characteristics of a plurality of light beams received by the receiver, and determining that, among signals of the plurality of light beams, a wavelength with a deviation from the average value is a wavelength at which control is to be performed, determining that the wavelength at which control is to be performed and a wavelength adjacent thereto are a group of wavelengths at which control is to be performed, obtaining an average of transmission characteristics of the group of wavelengths at which control is to be performed, and changing a light intensity output from each transmitter that transmits a group of wavelengths at which control is to be performed based on a difference between averaged transmission characteristics and respective transmission characteristics of the group of wavelengths at which control is to be performed. | 05-17-2012 |
| 20120141121 | OPTICAL TRANSMISSION EQUIPMENT - Optical transmission equipment includes: a first optical amplifier to amplify an input optical signal; a second optical amplifier provided at an output side of the first optical amplifier; an optical module having a first relay port to receive an optical signal from the first optical amplifier, a second relay port to output an optical signal to the second optical amplifier, an optical device provided between the first relay port and the second relay port, and a first output port optically couplable to the optical device; and a second output port to output the optical signal amplified by the second optical amplifier. | 06-07-2012 |
| 20120148236 | IN-BAND CONTROL MECHANISM - A method and apparatus of managing remote third party OTN & WDM transceiver equipment using the same fibers used for end user data exchange is described. A network device collects management instructions for the OTN & WDM transceiver equipment, assembles this management information into the overhead of a data frame and transmits on an optical link directly coupled to the network device. The WDM transceiver function converts the optical signal to an electrical one and the OTN function extracts the management instructions from the OTN overhead. A processor associated with the OTN framer function acts on that information. The management instructions includes the instruction to periodically and continuously, load certain performance, alarm or informational data into its OTN overhead and transmit that to a similar transceiver at the remote end of the communications link. Network-based monitoring equipment can optically tap off a portion of the signal and extract this information, allowing the network-based device to gain knowledge of conditions at the end points. | 06-14-2012 |
| 20120155863 | Data Processing in an Optical Network - A method and an optical component for data processing in an optical network are provided, wherein two sets of wavelengths are allocated; wherein at least one set of wavelengths is monitored; and wherein a collision between the two sets of wavelengths is avoided or compensated by adjusting at least one laser of an optical component. Furthermore, an optical communication system is suggested including said optical component. | 06-21-2012 |
| 20120163809 | Burst-Mode Receiver Equipped with Optical Amplifier, Method for Controlling Optical Amplifier, and System - To, even when a transmission wavelength varies in each ONU and an optical amplifier gain depends on the wavelength in an OLT equipped with an optical amplifier, prevent the optical amplifier gain from varying in every ONU and thus prevent deterioration of a dynamic range. The OLT estimates a transmission wavelength of each ONU at the time of ONU registration, and retains a correspondence between an ONU identifier and the transmission wavelength. Moreover, for every burst, an injection current to the optical amplifier is adjusted based on a wavelength and optical amplifier characteristic database. | 06-28-2012 |
| 20120170930 | WAVELENGTH SELECTIVE SWITCH AND METHOD FOR CORRECTING DEVIATION OF WAVELENGTH - A wavelength selective switch includes an input port and an output port, a wavelength demultiplexer that demultiplexes wavelength-multiplexed signal light into wavelengths in different optical paths, an optical-path controller that controls an array that has a plurality of switch elements, the plurality of switch elements switching all or a part of the wavelengths to be coupled from the input port to the output port, and an actuator driver that shifts the plurality of switch elements, based on a deviation of a center wavelength of a pass band from a reference wavelength. | 07-05-2012 |
| 20120189301 | APPARATUS AND METHOD FOR OPERATING A WAVELENGTH DIVISION MULTIPLEXING ACCESS NETWORK - The invention relates in general to a method, an apparatus and a unit for operating a Wavelength Division Multiplexing Access Network | 07-26-2012 |
| 20120201534 | OPTICAL TRANSMISSION APPARATUS AND OPTICAL TRANSMISSION SYSTEM - An optical transmission apparatus includes an optical transmitter that outputs a signal light corresponding to a wavelength of a WDM light, a multiplexer that multiplexes lights input to the plurality of input ports, and that outputs a light generated through the multiplexing from the one or more output port, an optical amplifier that amplifies the light output from the multiplexer; and an amplified spontaneous emission (ASE) transmitter that inputs branching off part of the light output from the optical amplifier by a splitter and multiplexes, with the signal light, ASE in a wavelength band corresponding to an unused wavelength adjacent to the signal light included in the branched-off light. | 08-09-2012 |
| 20120219289 | OPTICAL TRANSPORT SYSTEM AND OPTICAL NODE - An embodiment of the invention is an optical node configured to transmit/receive a wavelength-division-multiplexed signal. An optical monitoring unit monitors power levels of the wavelength-division-multiplexed signal on a wavelength-by-wavelength basis to acquire wavelength-by-wavelength power level values of the optical signals. A comparison arithmetic unit performs a comparison between each of the acquired wavelength-by-wavelength power level values of the optical signals, and a predetermined upper limit value and a predetermined lower limit value. A target value calculation unit determines target values of power levels at wavelengths whose acquired power level values exceed the upper limit value to be values between a center value and the upper limit value, and determines target values of power levels at wavelengths whose acquired power level values fall below the lower limit value to be values between the center value and the lower limit value. | 08-30-2012 |
| 20120224850 | OPTICAL NETWORKS - An optical network ( | 09-06-2012 |
| 20120230681 | OPTICAL TRANSMISSION APPARATUS AND OPTICAL ATTENUATION AMOUNT CONTROL METHOD - A storage device stores information regarding a channel from which an optical transmission apparatus at a subsequent stage drops a signal light. A processor determines that switching from second channel transmission using a larger number of channels than a first number of channels to first channel transmission is performed, and controls an attenuation amount, when performing the first channel transmission using the first number of channels, by referring to the storage device according to the determination and making the attenuation amount in a no-signal channel larger than a determine value if the no-signal channel whose wavelength is within a determined range from the wavelength of the signal light channel for the first channel transmission is a channel from which the optical transmission apparatus at the subsequent stage drops a signal light, so as to transmit an amplified spontaneous emission light along the no-signal channel. | 09-13-2012 |
| 20120230682 | SIGNAL LIGHT MONITORING APPARATUS, OPTICAL AMPLIFICATION APPARATUS AND OPTICAL RECEPTION APPARATUS, AND SIGNAL LIGHT MONITORING METHOD - According to an aspect of an embodiment, an apparatus includes an optical branching unit for branching an input signal light in four directions, a polarization component extraction unit extracting four polarization components having mutually different polarization parameters from lights branched in four directions by the optical branching unit, and a determination unit determining input/non-input of the signal light based on the four polarization components extracted by the polarization component extraction unit. | 09-13-2012 |
| 20120251103 | Wavelength Assignment In An Optical WDM Network - The path selection and wavelength assignment to a selected path are performed by mapping the wavelength reach to the demand distribution (agile reach) resulting in a 50-60% increase in the network reach. The network reach is further increased (about 2.2 times) when on-line measured performance data are used for path selection and wavelength assignment. The connections may be engineered/upgraded individually, by optimizing the parameters of the entire path or of a regenerator section of the respective path. The upgrades include changing the wavelength, adjusting the parameters of the regenerator section, controlling the launch powers, mapping a certain transmitter and/or receiver to the respective wavelength, selecting the wavelengths on a certain link so as to reduce cross-talk, increasing wavelength spacing, etc. | 10-04-2012 |
| 20120263459 | OPTICAL CHANNEL MONITOR AND OPTICAL TRANSMISSION APPARATUS - The optical channel monitor includes a polarization adjuster, a wavelength divider, a polarization divider, a first intensity detector, and a second intensity detector. The polarization adjuster adjusts the plane of polarization of a first optical signal to a first direction and the plane of polarization of a second optical signal to a second direction. The wavelength divider divides each of the optical signals multiplexed on the first and second optical signals, in accordance with the wavelengths. The polarization divider divides each of the divided optical signals, based on the direction of the plane of polarization. The first intensity detector receives an optical signal whose direction of the plane of polarization is the first direction among the divided optical signals. The second intensity detector receives an optical signal whose direction of the plane of polarization is the second direction. | 10-18-2012 |
| 20120269507 | CARRIER PHASE ESTIMATOR FOR NON-LINEAR IMPAIRMENT MONITORING AND MITIGATION IN COHERENT OPTICAL SYSTEMS - The present document relates to a method and apparatus in optical transmission systems for the estimation of the carrier phase and the degree of non-linear distortions incurred in an optical transmission channel. A plurality of signal samples are provided at succeeding time instances such that the plurality of signal samples: is associated with a modulation scheme and a carrier phase; has been transmitted over the optical transmission channel; comprises a plurality of signal phases, respectively; comprises a plurality of data phases and a plurality of residual phases, respectively; and the plurality of residual phases is associated with the carrier phase. The method comprises further canceling the plurality of data phases from the plurality of signal phases by taking into account the modulation scheme; thereby yielding the plurality of residual phases; and determining a set of autocorrelation values of the plurality of residual phases for a set of lag values, respectively. | 10-25-2012 |
| 20120281982 | Optical Channel Monitor - Described herein is an optical channel monitor ( | 11-08-2012 |
| 20120315033 | OPTICAL COMMUNICATION DEVICE - There is provided an optical communication device includes a first transmission unit including an optical source configured to emit a reference optical pulse, an optical splitter configured to branch the reference optical pulse, and generate a plurality of optical pulses, a plurality of optical fibers configured to have different length to set various time delays for the optical pulses, and a first optical connector, and a second transmission unit including a second optical connector coupled to the first optical connector, an optical multiplexer configured to multiplex the optical pulses that have passed through optical ports of the first and second optical connectors, and generate an optical pulse train, an optical receiver configured to convert the optical pulse train into an electric pulse train, and a measuring processor configured to determine communication states of the optical ports, based on the levels of electric pulses included in the electric pulse train. | 12-13-2012 |
| 20120321299 | OPTICAL CHANNEL MONITOR - An optical channel monitor includes a demultiplexer, a plurality of paths and a processing section. The demultiplexer demultiplexes an input optical signal, which is wavelength-multiplexed, for respective multiplexed wavelengths to generate a plurality of optical signals. The plurality of paths respectively generate a plurality of digital signals indicating optical powers of the plurality of optical signals. The processing section inputs the plurality of digital signals to calculate correction values of the optical powers, which correspond to characteristics of the demultiplexer. The demultiplexer includes a filter having FMHM (Full With at Half Maximum) within a predetermined range. The predetermined range is set based on a pass center wavelength accuracy of the filter and an oscillation wavelength accuracy of a transponder which generates the input optical signal. | 12-20-2012 |
| 20120321300 | NODE EQUIPMENT - Node equipment | 12-20-2012 |
| 20120321301 | Bandwidth Provisioning for the Entangled Photon System by Adjusting the Phase Matching - 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. | 12-20-2012 |
| 20120328286 | System and Method for Calculating Utilization Entropy - A system and method are provided for monitoring traffic in a network comprising a plurality of links, wherein each of the plurality of links comprises a plurality of neighboring pairs of slots. The system and method may include identifying a first usage status and a second usage status, calculating a utilization entropy value based at least on the difference between the first and second usage status, iteratively calculating a set of utilization entropy values for a portion of the network, and calculating an overall utilization entropy value for the portion of the network under analysis based at least on a statistical analysis of the set of utilization entropy values. | 12-27-2012 |
| 20120328287 | WAVELENGTH DIVISION MULTIPLEXED PASSIVE OPTICAL NETWORK APPARATUS AND METHODS OF CONFIGURATION | 12-27-2012 |
| 20130004162 | OPTICAL TRANSMISSION SYSTEM, OPTICAL TRANSMITTING APPARATUS, AND OPTICAL RECEIVING APPARATUS - An optical transmission system includes an optical transmitting apparatus that includes a polarization controller configured to change a polarization state of a signal light at an operating frequency included in a frequency range at which polarization trackability is obtained on a receiving side, based on a notified monitoring result, the optical transmitting apparatus being configured to output the signal light having the changed polarization state, and an optical receiving apparatus that is provided on the receiving side and includes a monitoring control unit configured to receive the signal light having the changed polarization state and monitor transmission quality of the received signal light, the optical receiving apparatus being configured to notify the optical transmitting apparatus of the monitoring result. | 01-03-2013 |
| 20130004163 | OPTICAL TRANSMISSION APPARATUS AND OPTICAL INTERLEAVING CONTROL METHOD - An optical transmission apparatus includes an interleaver configured to filter an optical carrier, a multiplexer configured to combine lights output from the interleaver to generate a composite light, a monitor configured to monitor a light intensity of the composite light, and a control circuit configured to change a grid spacing in a filter characteristic of the interleaver in a direction in which an amount of change in a light intensity of the composite light increases, on the basis of a monitoring result measured while changing a center frequency in the filter characteristic of the interleaver and to change the center frequency in the filter characteristic in a direction in which a maximum value of the light intensity increases, on the basis of the monitoring result. | 01-03-2013 |
| 20130004164 | Optical Trasnsport Network Alarms - An optical transport network signal (OTM) comprising at least one optical channel is received at a first network equipment. The optical transport network signal (OTM) is processed to extract optical data units (ODUk) for each optical channel (OCh). There is detection for defects during the processing. The optical data units are retransmitted within optical transport units (OTUk) towards a second network equipment. When a defect has been detected, the retransmitting comprises inserting an optical channel transport unit alarm indication signal (OTUk-AIS) in an optical channel transport unit (OTUk) containing optical channel data units (ODUk) that are affected by the detected defect. The second network equipment detects for the presence of the optical channel transport unit alarm indication signal (OTUk-AIS) and generation of an alarm is inhibited for any optical channel data units (ODUk) contained within the optical channel transport unit that comprises the optical channel transport unit alarm indication signal (OTUk-AIS). The network equipments can comprise a WDM or DWDM equipment and a cross-connect. | 01-03-2013 |
| 20130004165 | AUTOMATIC WAVELENGTH RECOGNITION APPARATUS AND METHOD - Provided are an automatic wavelength recognition apparatus and method. The automatic wavelength recognition apparatus includes: a division unit receiving a single optical signal and dividing the received optical signal into a plurality of optical signals; a plurality of filter units filtering the optical signals and having different and wavelength-dependent pass characteristics; a plurality of detection units detecting the filtered optical signals and measuring intensities of the detected optical signals; at least one comparison unit comparing outputs of any two of the detection units; and a wavelength determination unit receiving an output of the at least one comparison unit and determining a wavelength of the above single optical signal using a pre-stored look-up table. | 01-03-2013 |
| 20130004166 | WAVELENGTH-DIVISION MULTIPLEXING TRANSMISSION DEVICE - A wavelength-division multiplexing transmission device including: a dummy light source configured to emit and quench dummy light; a monitoring unit configured to monitor an optical level relating to the received wavelength-division multiplexed light; a dummy light controller configured to control the dummy light source to emit dummy light in case where the monitoring unit determines based on the monitored optical level that the wavelength-division multiplexed light is in a condition of input interruption; and a multiplexer configured to multiplex the light of the wavelength modulated based on the transmission data and the dummy light emitted by the dummy light source, wherein the transmitter transmits wavelength-division multiplexed light generated by the multiplexer. | 01-03-2013 |
| 20130016968 | TUNABLE DISPERSION COMPENSATION DEVICE, OPTICAL RECEPTION APPARATUS, AND METHOD FOR CONTROLLING TUNABLE DISPERSION COMPENSATIONAANM OHTANI; ToshihiroAACI YokohamaAACO JPAAGP OHTANI; Toshihiro Yokohama JP - A tunable dispersion compensation device includes a plurality of tunable dispersion compensators coupled in series, a controller configured to control an amount of chromatic dispersion to be set in each of the plurality of tunable dispersion compensators, and a table including a correspondence relationship between an amount of chromatic dispersion and a wavelength band, for each of the plurality of tunable dispersion compensators, wherein the controller decides an amount of chromatic dispersion to be set in each of the plurality of tunable dispersion compensators, based on a total amount of chromatic dispersion desired for the plurality of tunable dispersion compensators and the correspondence relationship included in the table so that a difference between bandwidths of a first tunable dispersion compensator having the widest wavelength band and a second tunable dispersion compensator having the narrowest wavelength band, among the plurality of tunable dispersion compensators, is within a given range. | 01-17-2013 |
| 20130022352 | OPTICAL NETWORK AND OPTICAL PATH SETUP METHOD - An optical network includes: an optical switch; a plurality of optical interface devices provided respectively for a plurality of servers and connected to the optical switch; and a manager to manage communication traffic of the plurality of servers. Each of the optical interface devices includes a fixed-wavelength optical transmitter and a wavelength tunable optical transmitter. A first optical path is set up via the optical switch by using the fixed-wavelength optical transmitters of the plurality of optical interface devices. The manager identifies first and second optical interface devices from among the plurality of optical interface devices in accordance with the communication traffic of the plurality of servers. A second optical path is set up between the first and second optical interface devices via the optical switch by using the wavelength tunable optical transmitters of the first and second optical interface devices. | 01-24-2013 |
| 20130022353 | NETWORK EVALUATION APPARATUS AND NETWORK EVALUATION METHOD - A network evaluation apparatus that evaluates a design of an optical network, the network evaluation apparatus including: a processor that selects two nodes, between which a lightpath is to be set up, from a plurality of nodes based on a traffic volume demand values, calculates a decreased amount of cost based on numbers of the plurality of nodes and a plurality of routers for relaying a signal transmitted between the two nodes selected, calculates an increased amount of cost based on a transmission distance of the lightpath and a number of a plurality of repeaters to be inserted according to a segment distance, and determines a value of the optical network based on the decreased amount of cost and the increased amount of cost. | 01-24-2013 |
| 20130028598 | OPTICAL NETWORKS - An optical network ( | 01-31-2013 |
| 20130045006 | METHOD AND A NETWORK NODE FOR IMPROVING BANDWIDTH EFFICIENCY IN AN OPTICAL NETWORK - A method and system are provided for improving bandwidth efficiency in an optical network by dynamically utilizing unused bandwidth located around preliminarily allocated optical channels. The method comprising monitoring actual bandwidth of the preliminarily allocated optical channels incoming to a node of the optical network, reporting the monitoring results to the controller of that node and further to a network controller, receiving at that node recommendations generated by the network controller, adjusting bandwidth of one or more of the allocated optical channels thereby releasing spare bandwidth for inserting one or more additional optical channels thereat. | 02-21-2013 |
| 20130045007 | MULTI-WAVELENGTH LIGHT AMPLIFIER - A multi-wavelength light amplifier includes a first-stage light amplifier which has a first light amplifying optical fiber amplifying a light input, a second stage light amplifier which has a second light amplifying optical fiber amplifying a first light output from the first-stage light amplifier, and an optical system which maintains a second light output of the second-stage light amplifier at a constant power level. The first-stage and second-stage light amplifiers have different gain vs wavelength characteristics so that the multi-wavelength light amplifier has no wavelength-dependence of a gain thereof. | 02-21-2013 |
| 20130051795 | MEASUREMENT OF OPTICAL PERFORMANCE FOR PASSIVE WDM SYSTEMS - A system, a device, and a method include a network interface device that measures optical power of a passive optical device; generates optical power data, and stores the optical power data. The system, the device, and the method, also includes generating alarms based on the optical power data and communication with remote network interface devices via the passive optical device. | 02-28-2013 |
| 20130051796 | TRANSPONDER DEVICE, OPTICAL BRANCHING DEVICE, AND OPTICAL SIGNAL TRANSMISSION METHOD IN OPTICAL TRANSPORT NETWORK NODE - A transponder device that can form D&C paths with great versatility and high reliability without complicating a device configuration is provided, as well as an optical branching device and an optical signal transmission method. The transponder device that is independent of any directions of a wavelength switching function section at a node in a WDM transport network includes a D&C branching means that branches an optical signal input from the wavelength switching function section into one stream of dropped light and at least one stream of continued light. | 02-28-2013 |
| 20130058645 | OPTICAL PACKET SWITCHING SYSTEM AND METHOD FOR CONTROLLING THE PEAK POWER - An optical packet switching system includes an optical packet transmitter, an optical packet switching apparatus, an optical amplifier, an optical packet receiver, an information gathering unit, and a peak power calculation unit. The information gathering unit collects the packet density, time-averaged power and extinction ratio from the optical packet transmitter, collects the packet density, time-averaged power and noise figure from the optical amplifier, collects the packet density, time-averaged power, switch on/off time ratio and extinction ratio from the optical packet switching apparatus, and collects the packet density and time-averaged power from the optical packet receiver. The peak power calculation unit calculates the peak power of an optical packet signal outputted from each apparatus/device based on the collected information. The device control unit control each apparatus/device based on the calculated peak power such that the optical packet signal having a peak power according to a predetermined optical level diagram is outputted. | 03-07-2013 |
| 20130064542 | OPTICAL FREQUENCY LOCKING METHOD AND DEVICE FOR OPTICAL DATA TRANSMISSION - An optical frequency locking method tunes each of a plurality of narrow-band optical channel transmit signals (having arbitrary channel frequency spacings) to a dedicated optical channel frequency. The method includes tapping-off a portion of the optical power of the respective channel transmit signal and filtering the tapped-off channel transmit signal using at least one optical filter device. The method also includes monitoring, as an optical input signal, the optical power of the respective channel transmit signal supplied to the at least one optical filter device and, as an optical output signal, the optical power of the filtered channel transmit signal. The method further includes tuning, within a predetermined locking range for the dedicated optical channel frequency, the optical frequency of the respective channel transmit signal such that a predetermined value for the ratio of the output signal and the input signal is reached. | 03-14-2013 |
| 20130077964 | PRECISE CLOCK SYNCHRONIZATION OVER OPTICAL FIBER - A clock at a first network element that is connected to a second network element over first and second optical links that are physically distinct from each other is aligned using optical timing signals having different wavelengths. Transit delays between the first and second network elements may be determined using the same optical timing signals. | 03-28-2013 |
| 20130084064 | METHOD AND SYSTEM OF AUTOMATIC REGENERATION OF OPTICAL SIGNALS - In accordance with the present disclosure, disadvantages and problems associated with transmitting high capacity (e.g., 400 G) optical signals may be reduced. In accordance with an embodiment of the present disclosure a method for regenerating an optical signal comprises receiving an optical signal at a network element and measuring a performance characteristic of the optical signal. The method further comprises determining that the optical signal needs regeneration based on the performance characteristic of the optical signal. The method additionally comprises performing signal regeneration of the optical signal based on the determination that the optical signal needs regeneration. | 04-04-2013 |
| 20130089324 | Wavelength Locking Method for an Optical Transceiver Device and Optical Transceiver Device - In one aspect, the present invention embraces a wavelength locking method for causing a narrow-band wavelength spectrum of an optical transmit signal of an optical transceiver device to track a narrow-band wavelength spectrum of an optical receive signal received by the optical transceiver device Further, the present invention embraces a wavelength lockable optical transceiver device, especially for a passive optical transmission network, using this wavelength locking method. | 04-11-2013 |
| 20130094853 | MULTIPLEXER/DEMULTIPLEXER AND MULTIPLEXING/DEMULTIPLEXING METHOD - In order to realize a multiplexer/demultiplexer in which utilization efficiency of a frequency is high, wavelength characteristics of a transmission band is flat, the cost is low, the size is small, and a wavelength and a band are variable, the multiplexer/demultiplexer includes: first light branching means for branching inputted light into plurality of pieces of light and outputting the branched pieces of light; a plurality of light wavelength separating means for separating and outputting light outputted from the first light branching means for each of predetermined frequency bands; and an optical coupling means for making outputs having frequency bands different from each other among outputs from the light wavelength separating means gather and be outputted. | 04-18-2013 |
| 20130121691 | OPTICAL TRANSMISSION SYSTEM, OPTICAL TRANSMISSION APPARATUS, SIGNAL CONDITIONING PROGRAM, AND SIGNAL CONDITIONING METHOD - An optical transmission system includes optical transmission apparatuses configured to transmit wavelength-division multiplexed light signals via lightpaths, each of a pair of optical transmission apparatuses includes a conditioning unit configured to adjust the optical intensities of channels included in the wavelength-division multiplexed light signal, and one or more first processors configured to control, based on a conditioning level notified, the conditioning unit; and a managing apparatus configured to manage the pair of the optical transmission apparatuses, the managing apparatus including one or more second processors configured to compute a conditioning level on a basis of system information for respective the pair of optical transmission apparatuses in the optical transmission system. | 05-16-2013 |
| 20130129349 | 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. | 05-23-2013 |
| 20130148961 | WAVELENGTH DIVISION MULTIPLEXING TRANSMISSION DEVICE - A transmitter to be added or reduced turns ON/OFF an optical output. A relay station and a receiving terminal station acquire the amount of fluctuation of the optical output of the received signal light when the optical output of the added transmitter is turned ON and OFF. From the amount of fluctuation of the optical output, the number of wavelengths after the addition or reduction is acquired. Without an OSC signal, each station may be informed of the number of wavelengths. Therefore, the configuration for transmitting and receiving the OSC signal is not requested, thereby reducing the total cost, appropriately controlling the gain of the optical amplifier, and successfully maintaining transmission quality. | 06-13-2013 |
| 20130156422 | OPTICAL COMMUNICATION DEVICE, WAVELENGTH NUMBER MEASUREMENT DEVICE, OPTICAL REPEATER, AND WAVELENGTH NUMBER MEASUREMENT METHOD - In an optical communication device, a light source is capable of varying the wavelength of light to be output. An optical multiplexer multiplexes light output from the light source with signal light received from a transmission path. To an optical medium, light output from the optical multiplexer is input. A monitor monitors light having a predetermined wavelength output from the optical medium. A wavelength number measuring unit measures the number of wavelengths of signal light transmitted through the transmission path based on the result of monitoring by the monitor. | 06-20-2013 |
| 20130195446 | DYNAMIC-GRID COMB OPTICAL SOURCE - An optical source uses feedback to maintain a substantially fixed spacing between adjacent wavelengths in a set of wavelengths in a wavelength comb output by the optical source. In particular, a set of light sources in the optical source provide optical signals having the set of wavelengths. Moreover, the optical signals are output at diffraction angles of an optical device in the optical source (such as an echelle grating), and optical detectors in the optical source determine optical metrics associated with the optical signals. Furthermore, control logic in the optical source provides control signals to the set of light sources based on the determined optical metrics. | 08-01-2013 |
| 20130195447 | Spectral Encoding of an Optical Label or Destination - An apparatus comprising a processor, wherein the processor is configured to to determine a plurality of available wavelengths that are available to transmit data over an optical network comprising a plurality of downstream nodes, select a plurality of encoding wavelengths from the available wavelengths, wherein the encoding wavelengths is a subset of the available wavelengths, and encode the data using the encoding wavelengths, wherein the encoding wavelengths dictate the switching behavior of the downstream nodes when the data is received by the downstream nodes. | 08-01-2013 |
| 20130202292 | POWER RECAPTURE IN AN OPTICAL COMMUNICATIONS SYSTEM - In an n-node optical communications system, energy harvesting photodetectors at each node receive extraneous electromagnetic wavelengths that are not used for communication or other purposes by the associated node. The energy harvesting photodetectors convert the unused electromagnetic energy into reusable electrical energy. The harvested electrical energy may be used as auxiliary power at the node or elsewhere in the communication system, or stored in a battery, capacitor, or other energy storage device. The system may be used in an “all-to-all” broadcast and select communication scheme or in some other broadcast and select interconnect system that has extraneous wavelengths at node receivers. | 08-08-2013 |
| 20130209094 | OPTICAL LINE TERMINAL FOR BIDIRECTIONAL WAVELENGTH-DIVISION-MULTIPLEXING OPTICAL NETWORK - The present disclosure relates to an optical line terminal, the disclosure includes: an optical transmitter for generating a low speed downstream optical signal; a wavelength-multiplexer for wavelength-multiplexing the downstream optical signal; a first optical power branching tap coupler for allowing wavelength-multiplexed downstream optical signal to branch off; a wavelength band separator/coupler for separating between the wavelength-multiplexed downstream optical signal and a wavelength-multiplexed upstream optical signal; a circulation type wavelength-demultiplexer for wavelength-demultiplexing a downstream optical signal branched off by the first optical power branching tap coupler and an upstream optical signal separated by the wavelength band separator/coupler; an optical receiver for outputting a downstream electrical signal by using the wavelength-demultiplexed optical signal; and a signal processing module for controlling an optical power and a wavelength of the optical transmitter according to a strength of the downstream electrical signal. | 08-15-2013 |
| 20130209095 | 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. | 08-15-2013 |
| 20130230316 | Super-Channel Optical Parameters GMPLS Signaling and Routing Extensions Systems and Methods - Methods and systems are disclosed including receiving, by circuitry of a node conforming to GMPLS protocol, a signal comprising at least one of an optical signal attribute indicative of parameters of a super-channel, the super-channel including a plurality of optical carriers, each of which having a corresponding one of a plurality of wavelengths and being modulated to carry a corresponding one of a plurality of data streams, the super-channel being provisioned in the optical network as one optical channel, wherein the optical signal attribute is one of: quantity of wavelengths of the super-channel, wavelength center frequency of the super-channel, wavelength modulation of the super-channel, wavelength baudrate of the super-channel, and wavelength FEC type of the super-channel. The node further receiving information indicative of frequency slices in use by the super-channel and calculating, using algorithms conforming to CSPF-TE protocol, a path of a second super-channel. | 09-05-2013 |
| 20130243424 | OPTICAL CHANNEL MONITOR - An optical channel monitor includes: a first optical device to include first, second and third optical ports, light input through the first optical port being led to the second optical port, light input through the second optical port being led at least to the third optical port; a second optical device to include fourth, fifth and sixth optical ports, light input through the fourth optical port being led to the fifth optical port, light input through the fifth optical port being led at least to the sixth optical port; an optical filter to include seventh and eighth optical ports optically connected to the second and fifth optical ports, respectively, a specified wavelength being transmitted between the seventh and eighth optical ports; a first photo detector to detect light output from the sixth optical port; and a second photo detector to detect light output from the third optical port. | 09-19-2013 |
| 20130266313 | CHARACTERIZING A FREQUENCY CHANNEL IN AN OPTICAL NETWORK - A tunable optical filter is configured to take point measurements at a few optical frequencies per frequency channel of a DWDM optical network. The measurement frequencies are shifted by pre-determined amounts relative to the optical frequency channel being characterized. Since the spectral shape of the tunable optical filter is known, the center optical frequency, the modulation bandwidth, and the total optical power of the channel can be obtained from as few as three optical measurements. The center optical frequency and the total optical power can be continuously monitored by providing a tunable filter stage coupled to an interleaver stage, and computing a ratio and a weighted sum the optical signals at the two outputs of the interleaver stage. | 10-10-2013 |
| 20130287391 | METHODS AND APPARATUS TO DETERMINE A CAPACITY FOR A NETWORK LAYER TOPOLOGY - Methods and apparatus to determine a capacity for a network topology are disclosed herein. An example method includes accessing a topology comprising a plurality of links; applying weights to the links; selecting a traffic element, the selected traffic element comprising a source node, a destination node, and a traffic demand; for each of the links: (a) determining for a selected link from the plurality of the links, whether the selected traffic element may be routed on the selected link without adding capacity to the selected link; and (b) applying penalties to the weights associated with the links that cannot support the selected traffic element without adding capacity; determining, based on the weights and penalties of the links, a routing path comprising at least one of the links between the source node and the destination node; and determining capacities of at least some of the links based on the routing path. | 10-31-2013 |
| 20130294770 | MONITORING SYSTEM, MONITORING METHOD AND MONITORING PROGRAM - A monitoring system which enables monitoring of a transponder accommodated in an optical path in a transmission node and a node according to their operation conditions is provided. The monitoring system comprises a monitor control management unit connected to at least one of ports of wavelength selective switches which monitors an inspection signal or an operation signal, and a control unit which controls the wavelength selective switch so as to enable monitoring by the monitor control management unit. | 11-07-2013 |
| 20130315585 | PASSIVE WAVELENGTH DIVISION MULTIPLEXING DEVICE FOR AUTOMATIC WAVELENGTH LOCKING AND SYSTEM THEREOF - The present invention relates to a passive wavelength division multiplexing device for automatic wavelength locking and a system thereof including an optical multiplexer, an optical filter, an integrated optical receiver monitor, and a tunable optical transmitter. | 11-28-2013 |
| 20130343750 | COMMUNICATIONS NETWORK USING ADAPTABLE FEC - A node for a communications network has a converter for digitizing at a receiver clock rate a received optical signal received over an optical link from an optical transmitter at a source node, a framer for detecting frames and a forward error correction part for correcting errors in the payload of the frame. An error rate in the received payload part is monitored and a processor sends, according to the monitored error rate, a request to the optical transmitter to adapt a length of the transmitted forward error correction part and to adapt a clock rate of the transmission of the frame if FEC length is reduced or FEC is disabled. This can enable power saving, when less FEC information is being sent. | 12-26-2013 |
| 20140029939 | Blocking Estimation To Evaluate Connection Blocking In Flexible Optical WDM Networks - A method for blocking estimation to evaluate connection blocking in flexible optical wavelength division multiplexing WDM networks includes a novel Markovian model to analyze the steady state probabilities and connection blocking probability along a fiber in FWDM networks and finding the state dependent arrival rate for each type of line rate on a fiber | 01-30-2014 |
| 20140105596 | OPTICAL TRANSMISSION SYSTEM, METHOD OF TESTING OPTICAL TRANSMISSION SYSTEM, AND NON-TRANSITORY COMPUTER-READABLE MEDIUM - An optical transmission system includes: an optical transmission device that has a plurality of optical transmitters configured to output at least one different wavelength and a multiplexer configured to multiplex wavelength lights output by the plurality of optical transmitters and output a multiplexed wavelength light; and a detection unit configured to detect each wavelength light that is branched before being fed into the multiplexer by sweeping an objective wavelength for detection, wherein, in a single sweeping, the detection unit selects and detects two or more wavelength lights with a wavelength interval that is wider than a wavelength interval of an output light of the multiplexer. | 04-17-2014 |
| 20140133850 | Fast Optical Link Control Adaptation Using a Channel Monitor - An amplifier receives an optical signal including a number of labeled channels via a fiber. The amplifier determines a count of the labeled channels and a spectral distribution of the labeled channels. The amplifier adjusts a parameter of the amplifier based on the count of the labeled channels and the spectral distribution of the labeled channels. The amplifier amplifies the optical signal at an adjusted output gain resulting from adjusting the parameter of the amplifier. | 05-15-2014 |
| 20140161445 | OPTICAL LINE TERMINAL FOR MONITORING AND CONTROLLING UPSTREAM/DOWNSTREAM OPTICAL SIGNALS - Disclosed is an optical line terminal for monitoring and controlling upstream and downstream optical signals, and more particularly, to an optical line terminal for monitoring and controlling upstream and downstream optical signals, which adds different low frequency monitoring signals to upstream and downstream wavelength division multiplexing optical signals in a bidirectional wavelength division multiplexing (WDM) optical network and senses and detects low frequency components of upstream and downstream optical signals to unite, monitor, and control optical outputs and wavelengths of the upstream and downstream wavelength division multiplexing optical signals into a single system. | 06-12-2014 |
| 20140161446 | OPTICAL AMPLIFIER (OA)-BASED REACH EXTENDER AND PASSIVE OPTICAL NETWORK SYSTEM INCLUDING THE SAME - The TWDM-PON system includes a service provider equipment configured to comprise a plurality of Optical Line Terminals (OLTs), wherein each OLT provides a service in a TWDM scheme; a subscriber equipment configured to comprise a plurality of an Optical Network Units (ONUs), wherein each of the plurality of ONUs utilizes a service provided from one of the plurality of OLTs using an optical signal of an arbitrary wavelength; an Optical Division Network (ODN) configured to transmit multi-wavelength downstream optical signals and multi-wavelength upstream optical signals; and a Reach Extender (RE) configured to comprise at least one of a downstream optical amplifier and an upstream optical amplifier, wherein the downstream optical amplifier is configured to amplify the multi-wavelength optical signals simultaneously, and the upstream optical amplifier is configured to amplify the multi-wavelength optical signals simultaneously. | 06-12-2014 |
| 20140193148 | Node and Method For Iterative Improvement of Spectral Use - Example embodiments presented herein are directed towards an optical testing node, and method therein, for establishing transmission parameters for optical communications in an iterative manner. The establishment of the transmission parameters may comprise adjusting various parameters such as a modulation scheme, a light path length, and/or a spectral width. | 07-10-2014 |
| 20140233943 | OPTICAL TRANSMISSION DEVICE AND OPTICAL TRANSMISSION DEVICE CONTROL METHOD - Each optical transmission device includes a detecting unit, a notifying unit, and a control unit. The detecting unit detects a value of the optical power of each of multiple wavelengths. The notifying unit notifies an optical transmission device at the upstream side of a control frame that includes the value and that includes information that indicates the execution state of the optical power control. The control unit calculates the adjustment level on the basis of the optical power of each of the wavelengths detected by the detecting unit. Furthermore, when the information included in the control frame sent from an optical transmission device at the downstream side indicates that the optical power control is being stopped, the control unit calculates the adjustment level on the basis of the value included in the control frame and executes optical power control by setting the calculated adjustment level to the optical device. | 08-21-2014 |
| 20140233944 | OPTICAL NETWORK TERMINAL (ONT) WAVELENGTH TUNING AND CORREPSONDING CALIBRATION PROCEDURE - Tuning an optical network unit (ONU) to an appropriate communication wavelength may be performed by initiating an activation procedure responsive to receiving a wavelength configuration message, and identifying an instruction in the wavelength configuration message to modify a present wavelength used by the network unit to a different wavelength. The process may also provide assigning an optical network unit identifier (ONU-ID) to the network unit, modifying the present wavelength to the different wavelength, and transmitting subsequent data messages from the network unit at the different wavelength. | 08-21-2014 |
| 20140233945 | WAVELENGTH DIVISION MULTIPLEXING OPTICAL TRANSMITTING APPARATUS AND OPERATING METHOD OF THE SAME - Provided is a wavelength division multiplexing (WDM) optical transmitting apparatus including first to n-th optical transmitters configured to output first to n-th optical signals having different wavelengths, respectively; a wavelength multiplexer configured to multiplex the first to n-th optical signals and generate an output optical signal; a tap coupler configured to receive the output optical signal and generate a controlling optical signal based on some of the output optical signal; a controlling photodetector configured to receive the controlling optical signal and output an optical current based on the controlling optical signal; and a controller configured to control each of the first to n-th optical transmitters based on the optical current, wherein the controller comprises a look-up table, sequentially detects driving conditions for the first to n-th optical transmitters, stores the detected driving conditions in the look-up table, and controls the first to n-th optical transmitters based on the detected driving conditions. | 08-21-2014 |
| 20140270757 | SYSTEM CONTROL OF REPEATERED OPTICAL COMMUNICATIONS SYSTEM - The system-level control of a repeatered optical communications system. In a repeatered optical communications system, two terminals are optically coupled via an optical communications span having one or more repeaters. One of the terminals may perform the control by monitoring quality metrics of optical signals received over the communication span. Based on this monitoring, certain adjustments are determined to be performed, and the repeater controllers of the respective optical repeaters are instructed to perform the adjustments. In some case, the optical repeater adjustments cannot be made without impacting the performance of the optical signals traveling in the opposite direction. In that case, the system-level control uses monitored quality metrics from both terminals to determine the adjustments to be made. The system level adjustment may be automated by software or the like thereby making optimization of the optical communications span easier. | 09-18-2014 |
| 20140286635 | OPTICAL TRANSMISSION APPARATUS AND DUMMY LIGHT INSERTING METHOD - An optical transmission apparatus includes a wavelength multiplexing unit that performs wavelength multiplexing with respect to dummy light for each channel of WDM and dummy light for each sub-band including the channels in plural; and a selecting unit that measures for each sub-band and corresponding to intensity of the channel-specific dummy light, transmission characteristics at a reception end, and according to measurement results, selects for each of the sub-bands, any one among the channel-specific dummy light and the sub-band-specific dummy light. The wavelength multiplexing unit wavelength multiplexes any of the channel-specific dummy light selected for each of the sub-bands by the selecting unit. | 09-25-2014 |
| 20140294381 | ADJUSTING CARRIER SPACING IN A CHANNEL - An optical system may include optical transmitters to provide respective optical signals. Each of the respective optical signals may provide one or more carriers in an optical channel. The optical channel may include multiple carriers associated with the respective optical signals. First and second carriers, of the multiple carriers, may have a particular carrier space width. The particular carrier space width may include a frequency error associated with one or more optical signals of the respective optical signals. The optical system may include a control system to determine the frequency error and cause one or more of the optical transmitters to adjust the particular carrier space width based on the adjusted frequency error. | 10-02-2014 |
| 20140341568 | High-Throughput Network Traffic Monitoring through Optical Circuit Switching and Broadcast-and-Select Communications - A network traffic collecting and monitoring system includes a traffic processing and dispatching module that pre-processes network traffic received from traffic tapping modules. A traffic collecting module receives and consolidates the network traffic and sends the network traffic to higher-layer applications. A controller dynamically configures the traffic processing and dispatching module to achieve optimal measurement accuracy and network coverage. | 11-20-2014 |
| 20140341569 | MOBILE COMMUNICATION REPEATER INTEGRATED MONITOR DEVICE, AND METHOD AND SYSTEM FOR MOBILE COMMUNICATION RELAY AND INFORMATION PROVISION - An integrated mobile communication repeater monitoring device, and method and system for mobile communication relay and information provision, is provided. Signals received from communication networks are divided into signals of mobile communication channels and signals of data channels, mobile communication services are provided to on the basis of the signals of the mobile communication channels, and data is displayed on the basis of the signals of the data channels. | 11-20-2014 |
| 20140341570 | AMORTIZATION OF EXPENSIVE OPTICAL COMPONENTS - A laser system includes an array of lasers that emit light at a number of different, fixed wavelengths. A group of optical transport systems connect to the laser system. Each of the optical transport systems is configured to modulate data signals onto the light from the laser system to create optical signals and transmit the optical signals on one or more optical fibers. | 11-20-2014 |
| 20140348502 | METHOD OF MONITORING WAVELENGTH OF OPTICAL SIGNAL OUTPUT FROM LIGHT EMITTING ELEMENT AND OPTICAL SIGNAL MONITORING CIRCUIT - An optical signal monitor circuit is an optical signal monitor circuit including a PD which directly detects an optical signal and converts the optical signal into a photocurrent, a PD which detects the optical signal and converts the optical signal into a photocurrent, a resistance element which converts these photocurrents into voltages, and an operational amplifier which outputs the voltages generated by the resistance element, wherein the optical signal monitor circuit further includes a switching control circuit which switches a connection between the PDs and the resistance element, and a calculation circuit which acquires the output of the operational amplifier as a digital signal, the switching control circuit controls switching to flow the two photocurrents into the resistance element at individual timings and flow the two photocurrents into the resistance element at the same timing, and the calculation circuit calculates a corrected digital signal by subtracting the obtained digital signal. | 11-27-2014 |
| 20140355980 | OPTICAL COMMUNICATION APPARATUS AND CONTROL METHOD THEREOF - An optical communication apparatus includes a variable resistor unit, a measurement unit, and a control unit. The variable resistor unit is arranged at a pre-stage of an electrical/optical conversion unit, which converts an electrical signal obtained by converting an input packet to an optical signal having a waveform corresponding to a potential difference between a positive phase component and a negative phase component of the electrical signal by using the potential difference. The variable resistor unit provides a resistor that varies a midpoint of potential of the positive phase component or the negative phase component. The measurement unit measures a ratio of a presence period, which is a period where the input packet is present, to a sum of the presence period and a non-presence period. The control unit controls a value of the resistor provided to the positive phase component or the negative phase component based on the ratio. | 12-04-2014 |
| 20150010302 | MULTIPLE WAVELENGTH OPTICAL ASSEMBLIES FOR INLINE MEASUREMENT OF OPTICAL POWER AND FIBER OPTIC NETWORKS - An apparatus for measuring optical power including a first multiplexer/demultiplexer to split/combine an optical signal including a first wavelength and second wavelength; a second multiplexer/demultiplexer to split/combine an optical signal including the first wavelength and the second wavelength; a first tap photodetector coupled to the first and second multiplexer/demultiplexers and to a first measurement device; and a second tap photodetector coupled to the first and second multiplexer/demultiplexers and to a second measurement device. | 01-08-2015 |
| 20150016818 | OPTICAL TRANSMISSION SYSTEM, MANAGEMENT DEVICE, AND SIGNAL ADJUSTMENT METHOD - An optical transmission system includes: a plurality of optical transmission devices each including: an adjustment unit to adjust optical power of channels in the WDM optical signal; and a controller to control the adjustment unit based on an adjustment amount, and a management device including: a converter to convert an evaluation value for evaluating quality of service provided by using the channels in the WDM optical signal into a threshold value of transmission quality to be satisfied by the channels; and a determination unit to calculate the transmission quality of the channels based on monitoring information of the channels in the WDM optical signal adjusted by the adjusting unit of at least one of the plurality of optical transmission devices and to determine the adjustment amount to be set for the optical transmission device so that the calculated transmission quality of the channels satisfy the threshold value. | 01-15-2015 |
| 20150023659 | CLOCK PHASE DETECTION IN THE FREQUENCY DOMAIN - A digital signal processor (DSP) may receive samples of a signal from an analog-to-digital converter (ADC); convert the samples from a time domain to a frequency domain; determine a clock phase error of the samples while in the frequency domain; and provide a voltage corresponding to the clock phase error. The voltage may be provided to reduce timing errors associated with the samples. | 01-22-2015 |
| 20150043908 | TESTING A PASSIVE OPTICAL NETWORK - A test apparatus and method for testing passive optical networks is provided. The test apparatus includes an optical circuit having an optical coupler for splitting off a portion of optical traffic. During testing of a passive optical network, the optical circuit is coupled into an optical path of the passive optical network. A bit stream corresponding to an activating procedure is captured and analyzed to extract identification information of the module that sent the bit stream. | 02-12-2015 |
| 20150050016 | APPARATUS AND METHOD FOR DESIGNING A NETWORK TRANSMITTING WAVELENGTH MULTIPLEXED OPTICAL SIGNALS - An apparatus determines, in response to demands for traffic between nodes in a network transmitting wavelength-multiplexed optical-signals, routes each providing connection between nodes, and estimates, for each link, communication-channels to be established, based on a wavelength-constraint condition that the number of communication-channels to be established be not greater than a first upper-limit for available optical-signal wavelengths. The apparatus assigns wavelengths to the communication-channels, based on a system-constraint condition that the number of optical-signals having an identical wavelength and redundantly usable be not greater than a second upper-limit for available transmission-systems. The apparatus determines a target-number of wavelengths for reducing a required number of transmission-systems. The apparatus changes the wavelength-constraint condition by defining the first upper-limit as the target-number and changes the system-constraint condition by reducing the second upper-limit, and re-estimates communication-channels based on the changed wavelength-constraint condition and re-assigns wavelengths based on the changed system-constraint condition. | 02-19-2015 |
| 20150063798 | OPTICAL TRANSMISSION DEVICE AND MONITORING METHOD OF OPTICAL SIGNAL - An optical transmission device includes: a reception unit configured to receive a plurality of light beams and wavelength allocation information of optical signals included in each of the light beams; a demultiplexing unit configured to demultiplex the plurality of light beams received; a plurality of switches configured to switch between transmitting or blocking with respect to the demultiplexed plurality of light beams; a multiplexing unit configured to multiplex light beams transmitted from the plurality of switches; a monitoring unit configured to monitor an intensity of the multiplexed light beams; and a controller configured to, based on the wavelength allocation information, obtain a combination of the light beams not including the optical signals having overlapping wavelengths, and control the plurality of switches in accordance with the combination. | 03-05-2015 |
| 20150093108 | Upstream Scheduling in a Passive Optical Network - In general, the 1G-EPON standard specifies its upstream waveband broadly to allow for low cost lasers to be used to transmit upstream. Often, however, the lasers actually used by many 1G-ONUs to transmit upstream only occupy a narrow waveband that does not overlap with the upstream waveband specified by the 10G-EPON standard. The present disclosure is directed to systems and methods that exploit this fact to efficiently provide for the coexistence of 10G-EPON and 1G-EPON over the same set of optical fibers in the upstream direction. | 04-02-2015 |
| 20150125145 | OPTICAL TRANSMISSION SYSTEM AND OPTICAL TRANSMISSION DEVICE - An optical transmission system includes: a first optical transmission device configured to perform bidirectional optical transmission with a second optical transmission device via an optical transmission line, wherein the first optical transmission device includes a transmitted light power adjusting section configured to transmit, to the second optical transmission device, a first light power which is set based on a measurement result, the second transmission device measuring a fluctuating light power transmitted from the first transmission device and informing the first transmission device of the measurement result. | 05-07-2015 |
| 20150139640 | OPTICAL MONITORING USING OPTICAL FREQUENCY COMBS - In one embodiment, an optical performance monitor (OPM) is configured to monitor a received optical wavelength-division-multiplexed (WDM) signal generated by modulating spectral lines of an optical frequency comb. The OPM is further configured to mix the received optical WDM signal with light of another optical frequency comb having a slightly different tooth spacing to generate a set of beat signals at frequencies representing frequency differences between the spectral lines (such as, at the carrier frequencies) of the optical WDM signal and the spectral lines of said another optical frequency comb. The OPM can further be configured to measure one or more parameters of the received optical WDM signal based on the characteristics of the generated beat signals and provide the resulting OPM data to a system controller for maintaining favorable signal-transport conditions within the system. | 05-21-2015 |
| 20150139641 | NONLINEAR NOISE CANCELLATION IN WAVELENGTH DIVISION MULTIPLEXING (WDM) SYSTEMS - A method that may include receiving a block of signals from a certain wavelength division multiplex (WDM) channel out of a set of WDM channels; analyzing at least a first sub-block of signals of the block of signals to provide analysis results indicative of interferences that affect the first sub-block of signals and result from transmissions over other WDM channels of the set of WDM channels; and mitigating interferences that affect the block of signals in response to the analysis results. | 05-21-2015 |
| 20150333860 | CONTROLLING AN OPTICAL TRANSMITTER THAT SUPPORTS MULTIPLE MODULATION FORMATS AND BAUD RATES - A device receives a modulation format and a baud rate for transmission of an optical signal, and generates optical signals based on the modulation format and the baud rate. The device generates quadrature-delay-interferometer signals based on the optical signal, the modulation format, and the baud rate, and generates a particular optical signal with a particular wavelength for the modulation format and the baud rate. The device determines whether a point of the quadrature-delay-interferometer signals is associated with the particular wavelength of the particular optical signal, and sets or adjusts the particular wavelength of the particular optical signal for the modulation format and the baud rate based on whether a point of the quadrature-delay-interferometer signals is associated with the particular wavelength of the particular optical signal. | 11-19-2015 |
| 20150333863 | MEASURING DEVICE, MEASUREMENT METHOD, AND TRANSMISSION SYSTEM - A measuring device includes an identifying unit configured to identify a design value of a central frequency of spectrum of an optical signal for each of sub-channels, the optical signal being formed in Nyquist pulse, the sub-channels forming a super-channel in wavelength division multiplexing communication; and a measurer configured to measure the power of the optical signal in a band for each of the sub-channels, the identified design value of the central frequency of the band being a central frequency of the band, the band being narrower than a frequency band of a corresponding one of the sub-channels. | 11-19-2015 |
| 20150349912 | OPTICAL NETWORK SYSTEM AND OPTICAL COMMUNICATION METHOD - An optical network system includes an optical line terminal, an optical splitter that is connected to the optical line terminal via one first optical fiber, and a plurality of optical network units that are connected to the optical splitter via respective second optical fibers. The plurality of optical network units communicate with the optical line terminal using an optical signal of a working wavelength uniquely assigned to each of them. The optical line terminal communicates with an optical network unit that is connected to the optical splitter using an optical signal of a working wavelength and an optical signal of a spare wavelength that is common to a plurality of optical networks. | 12-03-2015 |
| 20150365189 | SYSTEMS AND METHODS FOR STATISTICAL MULTIPLEXING WITH OTN AND DWDM - A method includes profiling user-network interface (UNI) ports including Optical channel Data Unit flex (ODUflex) in a network; and adapting, using a max-flow routing criterion, network-network interface (NNI) ports comprising ODUflex based on the profiling. A network includes a plurality of network elements; a plurality of links interconnecting the plurality of network elements, wherein the plurality of links includes Layer 0 Dense Wave Division Multiplexing (DWDM) bandwidth and Layer 1 Optical Transport Network (OTN) bandwidth; and a control plane operating between the plurality of network elements; wherein the Layer 0 DWDM bandwidth and the Layer 1 OTN bandwidth is statistically multiplexed using the control plane and manager based on monitoring bandwidth usage thereon over time. | 12-17-2015 |
| 20150381276 | OPTICAL TRANSMISSION SYSTEM, OPTICAL TRANSMISSION APPARATUS AND WAVELENGTH SPACING MEASUREMENT APPARATUS - An optical transmission system includes comprising: a first optical transmission apparatus to transmit wavelength-multiplexed optical signals; and a second optical transmission apparatus to receive the wavelength-multiplexed optical signals, the second optical transmission apparatus including: a receiver to perform digital coherent reception; a wavelength spacing monitor to transform a reception signal obtained by the digital coherent reception from a time domain signal to a frequency domain spectrum signal, and to monitor wavelength spacing of the spectrum signal; and a transmitter to transmit, to the first optical transmission apparatus, wavelength control information according to a monitor result obtained by the wavelength spacing monitor or the monitor result, wherein the first optical transmission apparatus includes: a receiver to receive the wavelength control information or the monitor result; and a control unit to control the wavelength spacing based on the wavelength control information or the monitor result received by the receiver. | 12-31-2015 |
| 20150381277 | OPTICAL TRANSMISSION SYSTEM, TRANSMITTER, RECEIVER, AND OPTICAL TRANSMISSION METHOD - An optical transmission system includes: a first light source configured to output a light wave of a first wavelength among a plurality of wavelengths; a second light source configured to output a light wave of a second wavelength; and a first detection section configured to detect abnormality in the light wave from the first light source, wherein upon detection of abnormality, a multiplexed optical signal including an optical signal of a modulated light wave generated using the light wave from the second light source in place of an optical signal of a modulated light wave generated using the light wave from the first light source is transmitted. | 12-31-2015 |
| 20150381305 | SELF-CALIBRATING TUNABLE LASER FOR OPTICAL NETWORK - Techniques are described for adjusting the wavelength of a laser so that the laser transmits at the defined wavelength without needing feedback from an optical line terminal (OLT) and without needing tap filters that follows a tunable filter in the upstream transmission path. | 12-31-2015 |
| 20160007105 | OPTICAL ELEMENT AND LIGHT RECEIVING DEVICE - An optical element includes: a polarization splitter that splits light input from an input port into a first signal and a second signal according to a plane of polarization; a polarization rotator that rotates a plane of polarization of the second signal output from the polarization splitter by 90 degrees; a first optical coupler that combines the first signal output from the polarization splitter and the second signal output from the polarization rotator and splits the resultant signal into a third signal and a fourth signal with an equal amplitude; a phase controller that controls a phase of the third signal; and a second optical coupler that combines the third signal output from the phase controller and the fourth signal output from the first optical coupler and splits the resultant signal into a fifth signal and a sixth signal with an equal amplitude. | 01-07-2016 |
| 20160020852 | OPTICAL TRANSMITTER AND OPTICAL TRANSMISSION METHOD - An optical transmitter includes an amplifying unit, a monitor, an identifying unit, and a controlling unit. The amplifying unit amplifies an optical signal in which an optical packet signal is mixed in optical path signals. The monitor monitors power of the optical signal on an input stage and an output stage of the optical amplifying unit, respectively. The identifying unit identifies an optical packet signal section on the input stage side based on the monitoring result on the input stage side, and identifies an optical packet signal section on the output stage side based on the monitoring result on the output stage side. The controlling unit compares the power of the identified section on the input stage side with the power of the identified section on the output stage side, and controls an amplification factor of the amplifying unit based on a power difference resulting from the comparison. | 01-21-2016 |
| 20160020866 | OPTICAL TRANSMITTER AND OPTICAL TRANSMISSION METHOD - An optical transmitter includes a dummy optical source, a polarized wave beam coupler, and an auto gain control (AGC)-system amplifier. The dummy optical source outputs, out of an optical signal in which an optical path signal and an optical packet signal are mixed, a dummy signal having a wavelength identical to that of the optical packet signal. The polarized wave beam coupler multiplexes the dummy signal with the optical signal so that the dummy signal is orthogonal to the optical signal so as to output an output signal. The AGC-system amplifier inputs the output signal, and amplifies the output signal with a predetermined amplification factor corresponding to a power difference between input power and output power of an optical amplifier. | 01-21-2016 |
| 20160020867 | BURST-MODE OPTICAL AMPLIFICATION APPARATUS AND METHOD THEREOF - A burst-mode optical amplification apparatus and method is provided. The burst-mode optical amplification apparatus includes a gain saturation signal generator configured to generate a gain saturation signal for gain stabilization based on an incoming input optical signal; a wavelength multiplexer configured to wavelength multiplex the incoming input optical signal and the gain saturation signal; and an optical amplifier configured to amplify both the wavelength-multiplexed input optical signal and the wavelength-multiplexed gain saturation signal. The apparatus may further include a time delay module configured to synchronize the input optical signal and the gain saturation signal by delaying the transmission time of the input optical signal, taking into consideration the processing time needed by the gain saturation signal generator to generate the gain saturation signal. | 01-21-2016 |
| 20160028503 | Controlling Optical Signal Power Levelling in an Optical Communication Network | 01-28-2016 |
| 20160028504 | WAVELENGTH DIVISION MULTIPLEXING SYSTEM AND METHOD INCLUDING WAVELENGTH MONITORING - A wavelength division multiplexing system and method featuring a wavelength monitor that is configured to receive a portion of a combined signal of wavelength division multiplexing channels and determine the wavelengths of each channel or the guardband between each channel in the combined signal. The wavelength monitor determines if there is excess laser drift for each channel in the combined signal. If excess laser drift is determined, feedback is sent to the transmitter for the signal with excess laser drift and the signal is adjusted to produce a target wavelength. The wavelength monitor may utilize optical intradyning in order to monitor the wavelengths of each channel in the combined signal. | 01-28-2016 |
| 20160037241 | TRANSMISSION DEVICE AND OPTICAL NETWORK SYSTEM - A transmission device includes: a wavelength-variable light source; a wavelength stabilized light source: a wavelength measuring device; a control circuit that controls the wavelength-variable light source; and a reception circuit that receives second reference wavelength light generated based on first reference wavelength light output from the wavelength stabilized light source whose wavelength stability is higher than that of the wavelength-variable light source, the control circuit calibrating the wavelength measuring device by using the second reference wavelength light, the control circuit calibrating the wavelength-variable light source by using the calibrated wavelength measuring device. | 02-04-2016 |
| 20160065303 | Methods, Apparatuses and System for Monitoring ROADM Optical Network - Provided are methods, apparatuses and a system for monitoring a Reconfigurable Optical Add Drop Multiplexer (ROADM) optical network. The method includes: loading, in an optical signal at a sending end, a wavelength label frequency and attribute information of a channel used for transmitting the optical signal; sending the wavelength label frequency and/or the attribute information; receiving, at a monitoring end, the optical signal and acquiring, from the optical signal, the wavelength label frequency and/or the attribute information of the channel used for transmitting the optical signal; and monitoring the ROADM optical network according to the wavelength label frequency and/or the attribute information. The technical solution solves the technical problem in related art that the ROADM optical network cannot be effectively monitored, and achieves the effective monitoring of the ROADM optical network. | 03-03-2016 |
| 20160065305 | OPTICAL TRANSMISSION SYSTEM AND OPTICAL TRANSMISSION DEVICE - An optical transmission system includes a transmitting device and a receiving device, wherein the transmitting device includes a modulating unit that changes a frequency of an optical signal, and the receiving device includes a filtering unit that passes an optical signal in a predetermined frequency band; a measuring unit that measures an intensity of an optical signal that passes through the filtering unit; a detecting unit that detects a center wavelength of the optical signal in accordance with an intensity of the optical signal that is measured when a frequency of the optical signal is changed in a state of a passed band that corresponds to the optical signal; and an output unit that outputs information that indicates the detected center wavelength to the transmitting device, wherein the transmitting device controls a wavelength of the optical signal in accordance with the information from the receiving device. | 03-03-2016 |
| 20160072609 | METHOD FOR DETECTING WAVELENGTH USAGE CONFLICTS IN AN OPTICAL NETWORK - A method of adding a transceiver including a transmitter and a receiver to an optical network. The transceiver is controlled to enable the receiver while maintaining the transmitter in a disabled state. The receiver detects a presence of an optical signal at a first wavelength. If an optical signal at the first wavelength is not present, the transmitter is enabled. Responsive to detection that an optical signal at the first wavelength is present: a feature of the optical signal, and a match condition between the detected feature and a predetermined feature are detected. The transmitter is enabled responsive to detection of the match condition. | 03-10-2016 |
| 20160073180 | MAINTAINING CHANNEL-INVARIANT OPTICAL NETWORK UNIT (ONU) EQUALIZATION DELAY IN A PASSIVE OPTICAL NETWORK - A device determines a zero-distance equalization delay and an order for optical line terminal (OLT) channel terminations (CTs), and determines a round-trip propagation time between a first OLT CT, based on the order, and an optical network unit (ONU). The device determines an equalization delay based on the round-trip propagation time, and hands over the ONU to a next OLT CT. The device calculates a round-trip delay for the next OLT CT based on a propagation time between the next OLT CT and the ONU, a processing time of the ONU, and the equalization delay. The device compares the round-trip delay, for the next OLT CT, with the zero-distance equalization delay to obtain a comparison result, and alters the zero-distance equalization delay based on the comparison result. The device repeats the performing, the calculating, the comparing, and the altering for remaining OLT CTs. | 03-10-2016 |
| 20160080105 | OPTICAL NETWORK UNIT SELF-CALIBRATION IN MULTI-WAVELENGTH PASSIVE OPTICAL NETWORK - A method and an apparatus for self-calibration of an ONU receiver in a multi-wavelength PON system, said method including the initial physical layer scan of the receiver tuning range, distributed estimation of the down-stream wavelength channel drift with respect to the nominal standard-based wavelengths, and reporting the estimated downstream wavelength channel drift in the downstream Channel_Map message. | 03-17-2016 |
| 20160085028 | Filter, Method for Producing Filter, and Laser Wavelength Monitoring Apparatus - A filter includes two translucent bodies. Each of the translucent bodies has a first plane, a second plane that forms a wedge angle with the first plane, and a third plane that intersects with both the first plane and the second plane, first planes of the two translucent bodies are parallel to each other, and second planes of the two translucent bodies are parallel to each other. The filter also comprises a beam splitting film, where surfaces of both sides are respectively combined with the first planes of the two translucent bodies. Two reflective films are combined, respectively, with the second planes of the two translucent bodies. | 03-24-2016 |
| 20160087717 | OPTICAL NETWORKS - An optical network comprising an optical network element comprising a first optical transmitter, a first controller, an optical receiver, a second optical transmitter, a second controller and optical receiver apparatus. Said first controller is arranged to control said first optical transmitter to generate and transmit a first optical signal in response no second optical signal being detected. Said first controller is arranged to iteratively generate and transmit said first optical signal at different wavelengths of a plurality of wavelengths until said second optical signal is detected, and is further arranged to subsequently maintain generation and transmission of said first optical signal at said wavelength at which said second optical signal is detected. Said second controller is arranged to control said second optical transmitter to generate and transmit said second optical signal following detection of said first optical signal by said optical receiver apparatus. | 03-24-2016 |
| 20160094305 | OPTICAL TRANSMISSION APPARATUS AND OPTICAL TRANSMISSION SYSTEM - An optical transmission apparatus including: an attenuator that attenuates a power of a first optical signal generated in a first modulation method to a first target level and attenuates a power of a second optical signal generated in a second modulation method, a modulation level in the second modulation method being lower than the modulation level in the first modulation method, to a second target level, the second target level being lower than the first target level; and a transmitter that sends a WDM signal including the first optical signal and the second optical signal that have been attenuated by the attenuator. | 03-31-2016 |
| 20160134389 | OPTICAL TRANSMITTER AND METHOD TO CONTROL THE SAME - An optical transmitter that outputs a wavelength multiplexed signal that multiplexing sub-signals generated by respective LDs. The bias current and the modulation current supplied to the LD are determined such that the sub-signal transmitting the optical multiplexer shows optical power independent of the temperature, and adjusted such that the extinction ratio and the average power of the sub-signal transmitting the optical multiplexer satisfy the preset condition by sensing the sub-signal in upstream of the optical multiplexer. | 05-12-2016 |
| 20160134390 | SYSTEMS AND METHODS FOR CHANNEL ADDITIONS OVER MULTIPLE CASCADED OPTICAL NODES - A method, an optical node, and an optical network include a power controller configured to bring channels in-service in parallel over multiple cascaded optical nodes quickly, efficiently, and in a non-service affecting manner. The method, node, and network utilize multiple states of a control loop that maintains a stable response in downstream optical nodes as channels are added in parallel. Further, the power controller is configured to operate independently alleviating dependencies on other power controllers and removing the need for coordination between power controllers. The method, node, and network provide efficient turn up of dense wave division multiplexing (DWDM) services which is critical to optical layer functionality including optical layer restoration. | 05-12-2016 |
| 20160134447 | APPARATUS FOR CONFIGURING COMMUNICATION-RELATED PARAMETERS - An apparatus for configuring one or more communication-related parameters in a cable modem system is provided. The apparatus comprises a processor, a memory coupled to the processor, a cable television signal input interface for receiving one or more cable television signals, a spectrum analyser for analysing a spectrum of signals, and a cable modem termination system unit for providing access to a communication network. | 05-12-2016 |
| 20160134952 | Monitor Photodiode Multiplexer for Integrated Photonic Switches - System and method embodiments are provided for monitor photodiode multiplexers for integrated photonic switches. Embodiment monitor photodiode multiplexers provide simplified control circuits, reduced power consumption, and improved manufacturability as compared to other solutions. In an embodiment, a photonic integrated circuit (PIC), includes a plurality of input terminals; a plurality of output terminals; and a plurality of monitor elements wherein each of the monitor elements is connected between one of the input terminals and one of the output terminals, wherein each monitor element comprises a photodiode and a rectifier diode, wherein the photodiode comprises a first terminal and a second terminal, wherein the rectifier diode comprises a third terminal and a fourth terminal, wherein the first terminal is connected to the third terminal, and wherein the first and third terminals comprise a same polarity. | 05-12-2016 |
| 20160142132 | OPTICAL PHASE NOISE EXTRACTING DEVICE AND OPTICAL PHASE NOISE EXTRACTION METHOD - An apparatus includes: a first measurer configured to measure first phase data indicating a temporal variation in a phase of a non-transferred signal that is an optical signal modulated by an optical phase modulation scheme and output from a transmitting device to an optical transmission path as the non-transferred signal; a second measurer configured to second phase data indicating a temporal variation in the phase of the optical signal transferred by the optical transmission path as a transferred signal on a side of a receiving device; a generator configured to generate differential data indicating a difference between the first phase data and the second phase data; and an extractor configured to use the differential data to extract, from the optical signal on the side of the receiving device, optical phase noise generated due to the optical transmission path. | 05-19-2016 |
| 20160142151 | Wavelength Stabilizer For TWDM-PON Burst Mode DBR Laser - An optical network unit (ONU) comprising a media access controller (MAC) configured to support biasing a laser transmitter to compensate for temperature related wavelength drift receiving a transmission timing instruction from an optical network control node, obtaining transmission power information for the laser transmitter, estimating a burst mode time period for the laser transmitter according to the transmission timing instruction, and calculating a laser phase fine tuning compensation value for the laser transmitter according to the burst mode time period and the transmission power information, and forwarding the laser phase fine tuning compensation value toward a bias controller to support biasing a phase of the laser transmitter. | 05-19-2016 |
| 20160156429 | METHOD AND APPARATUS FOR CONSTRUCTION OF COMPACT OPTICAL NODES USING WAVELENGTH EQUALIZING ARRAYS | 06-02-2016 |
| 20160164248 | MULTI-WAVELENGTH DISTRIBUTED RAMAN AMPLIFICATION SET-UP - Techniques are presented herein to set power levels for multiple Raman pump wavelengths in a distributed Raman amplification configuration. A first receive power measurement is obtained at a second node with a controlled optical source at a first node turned on and with a plurality of Raman pump lasers at different wavelengths at the second node turned off. A second receive power measurement is obtained at the second node with the controlled optical source at the first node turned on and the plurality of Raman pump lasers turned on to respective reference power levels to inject optical Raman pump power at a corresponding plurality of wavelengths into the optical fiber span. Based on a target Raman gain and a target Raman gain tilt, respective ratios of a total power are obtained, each ratio to be used for a corresponding one of the plurality of Raman pump lasers. | 06-09-2016 |
| 20160164600 | CROSSTALK SUPPRESSION IN A MULTI-PHOTODETECTOR OPTICAL CHANNEL MONITOR - An optical device includes an optical port array having first and second optical inputs for receiving optical beams and a first plurality of optical outputs associated with switching functionality and a second plurality of optical outputs associated with channel monitoring functionality. A dispersion element receives the optical beam from an input and spatially separates the beam into a plurality of wavelength components. The focusing element focuses the wavelength components. The optical path conversion system receives the plurality of wavelength components and selectively directs each one to a prescribed one of the optical ports. The photodetectors are each associated with one of the optical outputs in the second plurality of optical outputs and receive a wavelength component therefrom. The controller causes the optical path conversion system to simultaneously direct each of the wavelength components to a different one of the optical outputs of the second plurality of optical outputs. | 06-09-2016 |
| 20160164623 | WAVELENGTH SELECTIVE SWITCH HAVING INTEGRATED CHANNEL MONITOR - An optical device includes an optical port array having first and second optical inputs for receiving optical beams and a first plurality of optical outputs associated with switching functionality and a second plurality of optical outputs associated with channel monitoring functionality. A dispersion element receives the optical beam from an input and spatially separates the beam into a plurality of wavelength components. The focusing element focuses the wavelength components. The optical path conversion system receives the plurality of wavelength components and selectively directs each one to a prescribed one of the optical ports. The photodetectors are each associated with one of the optical outputs in the second plurality of optical outputs and receive a wavelength component therefrom. The controller causes the optical path conversion system to simultaneously direct each of the wavelength components to a different one of the optical outputs of the second plurality of optical outputs. | 06-09-2016 |
| 20160164624 | OPTICAL RECEPTION APPARATUS AND MONITOR SIGNAL GENERATING METHOD - An optical reception apparatus ( | 06-09-2016 |
| 20160173202 | Adaptive Noise Loading in Optical Communication Networks | 06-16-2016 |
| 20160204875 | OPTICAL TRANSMISSION SYSTEM, WAVELENGTH CONTROL METHOD AND NODE | 07-14-2016 |
| 20160204876 | OPTICAL TRANSMISSION APPARATUS, OPTICAL TRANSMISSION SYSTEM, AND TRANSMISSION WAVELENGTH CONTROL METHOD | 07-14-2016 |
