Entries |
Document | Title | Date |
20080260381 | COMMUNICATION APPARATUS USING CHAOTIC SIGNAL AND METHOD THEREOF - A communication apparatus using a chaotic signal and a method thereof are provided. The communication apparatus includes a correlator which multiplies source data by one of an optical orthogonal code (OOC) and a prime sequence code (PSC), and outputs transmission data, a transmission signal generating unit which generates a chaotic transmission signal by masking the transmission data with respect to a chaotic signal, and an antenna which transmits the chaotic transmission signal. As a result, multiple accesses are enabled, and a wireless communication system for short-distance operation, which is economic and low power-consuming, is provided. | 10-23-2008 |
20080273874 | Method and apparatus for low chirp transmitter for optical fiber communications - A directly modulated optical transmitter for use with a fiber optical communications system operating in the 1550 nm wavelength band exhibits very low chirp. The chirp inherently present in a directly modulated laser is cancelled by a phase modulator which optically modulates the directly modulated laser light beam by applying a 180° phase delay to a split-off portion of the input radio frequency signal. This provides a low cost transmitter capable of operating in the 1550 nm band and with laser chirp effectively cancelled or substantially reduced, thereby avoiding distortions due to laser chirp interactions with the downstream optical fiber. | 11-06-2008 |
20080279551 | Method and apparatus for transporting client signals over transport networks using virtual concatenation - The invention includes a method and apparatus for transporting a client signal over a transport network using enhanced virtual concatenation (VCAT) and enhanced link capacity adjustment scheme (LCAS) techniques. A method includes provisioning, for a client signal, a virtual concatenation group (VCG) signal having a VCG signal bandwidth, converting the VCG signal into a set of VCG member signals including a plurality of working VCG member signals and at least one protection VCG member signal where the set of VCG member signals has an aggregate bandwidth greater than the VCG signal bandwidth, and propagating the client signal toward the transport network using the set of VCG member signals. The client signal is initially conveyed by the working VCG member signals, and the at least one protection VCG member signal is available to protect the working VCG member signals. The client signal may be a constant bit rate (CBR) client signal. | 11-13-2008 |
20080298803 | SYSTEM AND METHOD FOR PROTECTION OF POINT TO MULTIPOINT PASSIVE OPTICAL NETWORK - A system and method relating to a point-to-multipoint Passive Optical Network (PON) that protects the system against fiber breaks or damage which can disrupt the path between the OLT and a plurality of Dual Transceiver ONUs. | 12-04-2008 |
20080304826 | Semiconductor optical amplifier for an external cavity diode laser - In one embodiment, a gain medium for an external cavity diode laser (ECDL) includes a gain section to provide a gain operation on optical energy in the ECDL that is controlled by a first electrical signal, a semiconductor optical amplifier (SOA) section disposed adjacent to the gain section to amplify the gained optical energy responsive to a second electrical signal, and a trench disposed between the gain section and the SOA section to act as an integrated mirror. Other embodiments are described and claimed. | 12-11-2008 |
20080310838 | Independent upstream/downstream bandwidth allocations in a common hybrid telecommunications network - A network interface apparatus comprises a bidirectional optical signal port, an optical diplexer connected to the bidirectional optical signal port, a first RF signal port (bidirectional), a second RF signal port, a first RF diplexer, and an RF splitter. The RF diplexer transmits a first received RF input signal from the first RF signal port to the optical diplexer to modulate an optical output signal transmitted by the optical diplexer to the optical signal port. The RF splitter receives from the optical diplexer an RF signal derived from an RF-modulated optical input signal received from the bidirectional optical signal port, transmits a first portion of the derived RF signal as a first RF output signal to the first RF signal port through the first RF diplexer, and transmits a second portion of the derived RF signal as a second RF output signal to the second RF signal port. | 12-18-2008 |
20080317464 | Base Station System - The present invention discloses a base station system, including an indoor part and a remote RF subsystem (RRS). The indoor part includes a RIU, a CCU, a BBU, a GPSU and a local interface unit. The RRS includes a remote interface unit, a RF transceiver unit (TRU) and an antenna. The local interface unit and the remote interface unit are for signal intercommunicating between the indoor part of the base station and the RSS. The TRU is a RF transceiver module of the conventional RFU, for amplifying an analog RF signal from the remote interface unit and transmitting the signal to the antenna. By flexibly selecting between an optical cable and an If cable, the interface unit of the present invention provides a digital baseband remote manner and an IF remote manner. According to the structure of the base station of the present invention, the number of the base station sites and the network operating cost decreases; on the other side, since one base station may cover a cell by smart antenna with only one optical cable or IF cable, the difficulty in mounting is reduced. | 12-25-2008 |
20090003826 | Optical Sub-Assembly with Electrically Conductive Paint, Polymer or Adhesive to Reduce EMI or Sensitivity to EMP or ESD - Disclosed are various embodiments of an optical wavelength division demultiplexer or multiplexer sub-assembly configured to receive or transmit optical signals conveyed thereto or therefrom by a fiber optic cable. Selected portions of external surfaces of the sub-assembly are coated with an electrically conductive paint, polymer or adhesive to provide an EMI, EMP or ESD shield. Typically, the sub-assembly comprises an integrally molded plastic optical block and a separate integrally molded coupling module with a ferrule and fiber optic cable receptacle. In one embodiment, selected external surfaces of the optical block and coupling module are coated with a coating having a predetermined electrical conductivity to provide a desired degree of EMI, EMP or ESD shielding. | 01-01-2009 |
20090010645 | NODE DEVICE AND LABEL MANAGEMENT METHOD IN OPTICAL TRANSMISSION NETWORK - A node device in an optical transmission network where a manually set path and an ADP (autonomous decentralized protocol) set path coexist, wherein the manually set path is set by centralized control and the ADP set path is set by autonomous decentralized processing, the node device including: a label memory for storing at least first labels used for manually set paths and second labels used for ADP set paths, wherein the first and second labels previously defined before path setting; and a resource manager for setting a manually set path and an ADP set path by referring to contents stored in the label memory. | 01-08-2009 |
20090010646 | Optical pulse time spreading device - An optical pulse time spreading device includes S optical pulse time spreading elements that spread input optical pulses into trains of (N×j) chip pulses, where j is an integer greater than zero, S is an integer greater than one, and N is an integer equal to or greater than S. In the chip pulse trains output by the n-th optical pulse time spreading element (n=1, 2, . . . , S), the light in successive chip pulses is shifted in phase by successive integer multiples of the quantity 2π{a+(n−1)/N}, where a is an arbitrary constant (0≦a<1). In an optical code-division multiplexing system, this optical pulse time spreading device produces an autocorrelation wave with a high energy and a high signal-to-noise ratio. | 01-08-2009 |
20090022492 | DQPSK Transmitter With Parallel Precoder And High-Speed DQPSK Data Stream Realignment - The present invention utilizes field programmable gate arrays (FPGAs) to implement a parallel differential quadrature phase shift keying (DQPSK) precoder and a DQPSK optical transmitter with an automatic realignment process. The present invention can perform DQPSK preceding, modulation, and data stream realignment at any lower rate, and its upper rate is determined by capability in speed and logic resources and external connections of available integrated circuit technology. | 01-22-2009 |
20090034968 | Optical band splitter/combiner and apparatus comprising the same - An optical device for splitting/combining a first and a second continuous optical wavelength bands, each wider than 10 nm, has a first, a second, a third, a fourth and a fifth optical splitting devices optically coupled in cascade and a first, a second, a third and a fourth optical differential delay devices optically coupled to, and interleaved between, the optical splitting devices. A suitable choice of the coupling angles of the splitting devices and of the differential delays of the optical differential delay devices gives to the structure flattened passbands and stopbands and makes the optical device tolerant to fluctuations of the structural parameters. An apparatus includes the optical device for use in fiber-to-the-premises networks. | 02-05-2009 |
20090034969 | CORRELATION APPARATUS - This invention relates to a pattern recognition correlator in which a serial input data signal is converted into a parallel data signal for correlation with one or more reference data signals. The invention relates to use of a demultiplexer in such a correlation apparatus to reduce the data update rate for the subsequent components. The invention also relates to the use of a series of latch circuits to provide serial to parallel conversion of the input data signal in the electrical domain. | 02-05-2009 |
20090047016 | Multi-access network terminal, communication method, service-providing method, and revenue-receiving method - A multi-access network terminal includes first and second communication interfaces. The first interface is configured to communicate with a first service provider providing services to a user through the first interface with a first type of signal and/or a first type of communications protocol. The second interface is configured to communicate with the first service provider providing services to the user through the second communication interface using a second type of signal and/or a second type of communications protocol. Alternatively, the second interface is configured to communicate with a second service provider providing services to the user through the second communication interface using the first or second type of signal and/or the first or second different type of communications protocol. | 02-19-2009 |
20090047017 | OPTICAL ANALOG/DIGITAL CONVERSION METHOD AND APPARATUS THEREOF - A high speed optical analog/digital conversion process with a simple configuration, in which an optical-pulse branching delay multiplexer generates as many duplicates of each optical pulse as the predetermined number of bits by branching each optical pulse string obtained by sampling an input optical analog signal, and generates a temporally consecutive optical pulse string by multiplexing the duplicated optical pulses with a predetermined intensity difference and time difference. An optical encoder and an optical-threshold processing unit perform an encoding and a quantization of an optical pulse string, and output an optical digital signal corresponding to the optical analog signal. | 02-19-2009 |
20090052894 | PON SYSTEM AND TERMINAL OPERATION REGISTERING METHOD - In a PON system in which communication is performed at a plurality of types of transmission rate (L, M, and H) in an upstream direction from a plurality of terminals connected to a station apparatus through optical fibers, within a discovery period for allowing an unregistered terminal to be recognized by station apparatus, the terminal makes a discovery response at one type of transmission rate (L). With this configuration, station apparatus can wait for a discovery response with a receive function being allowed to support transmission rate (L). | 02-26-2009 |
20090060500 | DATA PROCESSING SYSTEM AND STORAGE DEVICE - A storage device includes a memory that stores data, a memory controller that controls reading and writing of data from and to the memory, and a host controller. The host controller transmits and receives the data to and from a host via a transmission line. The host controller transmits and receives the data, via an optical transmission line, to and from (i) the memory controller and (ii) a memory controller of at least one other storage device. | 03-05-2009 |
20090067833 | METHOD AND ARRANGEMENT FOR TRANSMITTING AN OPTICAL OFDM-SIGNAL - From an real valued OFDM signal (S | 03-12-2009 |
20090074407 | HIGH-SPEED SERIALIZER, RELATED COMPONENTS, SYSTEMS AND METHODS - A communication system includes a multiplexer configured to multiplex a first set of data channels into a first data channel and to multiplex a second set of data channels into a second data channel, and a delay adjuster configured to adjustably delay the first data channel based on a delay adjust command. The communication system also includes a first amplifier configured to amplify the delayed first channel into a first output data channel, and a second amplifier configured to amplify the second data channel into a second output data channel. The communication system further includes a first driver configured to convert the first output data channel into a first drive signal to drive an optical modulator, and a second driver configured to convert the second output data channel into a second drive signal to drive the optical modulator. | 03-19-2009 |
20090097847 | OPTICAL MODULE - An optical module comprising: a submount provided on a CAN stem; light-emitting device and a light-receiving device; a CAN cap or package; and an optical multiplexer/demultiplexer having a wavelength selective filter on a substrate that has transmissivity to passing light and a mirror, where an extending direction of the optical multiplexer/demultiplexer is fixed in the CAN cap or the package being tilted by an angle θ (θ≠2Nπ, N=0, 1, 2, . . . ) in a two-dimensional cross section with respect to one surface of an optical device mounting board, outgoing light from the light-emitting device passes through the wavelength selective filter and the substrate and enters an optical fiber outside the cap, and outgoing light from the optical fiber enters the optical multiplexer/demultiplexer and is reflected by the wavelength selective filter and further reflected by the mirror, and then exits the optical multiplexer/demultiplexer to enter the light-receiving device. | 04-16-2009 |
20090142054 | SONET multiplexer card having front panel access to electrical and optical connectors for use in compact enclosure for SONET multiplexer cards - A reduced size multiplexer and, in particular, a reduced size SONET multiplexer module is provided for use in a reduced size enclosure. The SONET multiplexer module has electrical and optical connectors on its faceplate to provide ease in access without having to remove the SONET multiplexer from the enclosure. The SONET multiplexer circuit is configured in a standard Type 400 mechanics circuit board arrangement. The SONET multiplexer module therefore can be inserted into an enclosure in a direction opposite to that in which the DS1 or DS3 connector projects from the face plate, so that the DS1 or DS3 connector remains freely accessible outside of the enclosure when the SONET multiplexer module is fully loaded into the enclosure. DS1 and DS3 cables and optical fibers can thus be easily coupled to the DS1 and DS3 and optical connectors, respectively, when the SONET multiplexer circuit is fully loaded into the enclosure. | 06-04-2009 |
20090148160 | Optical diplexer module using mixed-signal multiplexer - An optical diplexer module includes: an optical diplexer module comprising: a multiplexing unit multiplexing RF signals and a wideband digital signal having a baseband bandwidth to output a single multiplexed signal; an E-O converter converting the multiplexed signal into an optical signal and externally outputting the optical signal; and an O-E converter converting an externally received optical signal into an electric signal and outputting the electric signal. Similarly to existing optical transceivers, the optical diplexer module can provide TPS and MPS services using only two optical wavelengths for upstream and downstream signals. Since no separate optical wavelength is additionally required, the optical diplexer module can allows the numbers of components and processes to be reduced. It may result in yield improvement and cost reduction. Also, since electric or optical crosstalk between modules can be reduced, its performance can be improved. | 06-11-2009 |
20090148161 | 10 GBE LAN SIGNAL MAPPING TO OTU2 SIGNAL - A high-capacity digital communications system and method of transporting 10 GbE LAN packets between user devices over an OTN network that allows the packets to be transported in a manner that is transparent to the destination device(s) on the network. The digital communications system includes an OTN network, and at least one source device and at least one destination device connected to the network via respective 10Gbase-R interfaces. The system transports 10 GbE LAN data packets over the OTN network by performing decoding on the packets to recover the preamble and variable length data contained in each packet, removing the IPG between successive packets in the stream, encapsulating the packets including the respective preambles and data, and mapping the encapsulated packets to the overhead and payload areas of ODUk frames. The packets are then transported over the OTN network from the source device to the destination device. | 06-11-2009 |
20090162057 | PLUGGABLE MODULE WITH INTEGRATED TRAFFIC MANAGEMENT FUNCTIONALITY - The invention relates to a network comprising at least one host device having an interface card connected to a backplane of said host device, wherein said interface card comprises at least one cage for receiving a pluggable module which performs a traffic management of data transported via at least one optical fibre connected to said pluggable module. | 06-25-2009 |
20090169204 | FRAME-INTERLEAVING SYSTEMS AND METHODS FOR 100G OPTICAL TRANSPORT ENABLING MULTI-LEVEL OPTICAL TRANSMISSION - The present invention provides frame-interleaving systems and methods for Optical Transport Unit K (OTUK) (i.e. Optical Transport Unit 4 (OTU4)), 100 Gb/s Ethernet (100 GbE), and other 100 Gb/s (100 G) optical transport enabling multi-level optical transmission. The frame-interleaving systems and methods of the present invention support the multiplexing of sub-rate clients, such as 10×10 Gb/s (10 G) clients, 2×40 Gb/s (40 G) plus 2×10 G clients, etc., into two 50 Gb/s (50 G) transport signals, four 25 Gb/s (25 G) transport signals, etc. that are forward error correction (FEC) encoded and carried on a single wavelength to provide useful, efficient, and cost-effective 100 G optical transport solutions today. In one exemplary configuration, a 100 G client signal or 100 G aggregate client signal carried over two or more channels is frame-deinterleaved, followed by even/odd sub-channel FEC encoding and framing. In another exemplary configuration, a 100 G client signal or 100 G aggregate client signal carried over two or more channels is received and processed by a single 100 G FEC framer, followed by frame-deinterleaving into two or more sub-rate channels. | 07-02-2009 |
20090185803 | OPTICAL MULTIPLEXER/DEMULTIPLEXER - An optical multiplexer/demultiplexer comprises one light guide main line which guides lights of a plurality of wavelengths, and two or more microring optical resonators directly optically coupled to the one light guide main line. The two or more microring optical resonators are arranged in any two of layers higher than, level with, and lower than a plane where the one light guide main line is disposed, and/or the two or more microring optical resonators are arranged on both sides of the one light guide main line in a light guide direction. | 07-23-2009 |
20090196605 | Communications System with Symmetrical Interfaces and Associated Methods - A communications system includes a physical layer device (PLD) and a logical link device (LLD), each having respective send and receive interfaces being substantially identical to define symmetrical interfaces for the system. Accordingly, design and manufacturing is simplified compared to conventional systems. In addition, advantages are also provided in terms of loopback capability and packaging options. The PLD comprises a PLD send interface including PLD parallel information outputs, and a PLD receive interface including PLD parallel information inputs. Similarly, the LLD comprises an LLD receive interface including LLD parallel information inputs, and an LLD send interface including LLD parallel information outputs. Parallel communications channels connect the PLD information outputs to respective LLD information inputs, and connect the LLD information outputs to respective PLD information inputs. The PLD send interface and the LLD send interface are substantially identical, and the PLD receive interface and the LLD receive interface are substantially identical to thereby define the symmetrical interfaces for the system. In view of the symmetrical interfaces, the PLD and the LLD may operate in a push-push configuration. Deskewing features are also provided. | 08-06-2009 |
20090214206 | BANDWIDTH ALLOCATION METHOD, OPTICAL LINE TERMINATOR, SUBSCRIBER STATION, COMMUNICATION SYSTEM, AND RECORDING MEDIUM RECORDING PROGRAM OF DEVICE - An exemplary object of the present invention is to accurately reflect allocation requests and increase the bandwidth use efficiency without requiring expensive and fast integrated circuits or CPUs in the control unit even in a large-scale system with a large number of terminal devices. A subscriber station comprises allocating means for determining bandwidth allocation based on a predetermined allocation condition and bandwidth transmitting means for transmitting bandwidth allocation information determined by the allocating means to an optical line terminator. The optical line terminator comprises pipeline transmitting means for transmitting bandwidth allocation information transmitted from the subscriber stations to all subscriber stations to be allocated with bandwidth. | 08-27-2009 |
20090232495 | PASSIVE OPTICAL NETWORK SYSTEM WITH MODE-VARIABLE OPTICAL NETWORK UNIT - An optical line terminal connecting with numbers of optical network units comprises a control unit which controls each optical network unit to make it operate in a first mode in which transmission and reception of control messages and data are possible or in a second mode in which the transmission and reception of control messages are possible but the transmission of data is impossible, according to a communication permission request transmitted from an optical network unit and based on a preset maximum number of optical network units permitted to execute upstream communication from the optical network unit to the optical line terminal. | 09-17-2009 |
20090232496 | OPTICAL COMMUNICATION APPARATUS, OPTICAL TRANSMISSION SYSTEM AND METHOD FOR REDUCING NONLINEAR DEGRADATION - This invention provides an optical communication apparatus in which the nonlinear degradation of a wavelength multiplexed signal in the nonlinear degradation factor member causing the nonlinear degradation is reduced, an optical transmission system using the same, and a method for reducing the nonlinear degradation. There are provided a wavelength interval enlarging portion | 09-17-2009 |
20090245790 | PASSIVE OPTICAL NETWORK SYSTEM AND OPERATION METHOD OF THE SAME - In a passive optical network system, in order that by measuring a transmission distance and a transmission time between an OLT and an ONU in operation of the system, if the distance or the time is short, communication is conducted at a high transmission speed to increase a capacity of user; if the distance or the time is long, communication is conducted at a low transmission speed to increase the capacity of user communicating in a state in which a predetermined quality is secured, a main station includes a signal communication circuit to communicate with subsidiary stations at a first or second transmission speed and a controller to measure a transmission distance or a transmission time between the main station and each subsidiary station. Based on a result of the measurement, the controller selects a transmission speed for communication with the subsidiary station. | 10-01-2009 |
20090269059 | LONG-REACH PASSIVE OPTICAL NETWORK USING REMOTE MODULATION OF AN AMPLIFICATION OPTICAL SIGNAL - A passive optical network is provided, which includes an optical central office connected to a line termination device by a branch of the network including a passive amplification medium. The central office is adapted to send/receive a first data optical signal and has a first amplifier for sending a second amplification optical signal. The second signal exciting the amplification medium to amplify the optical power of an optical signal. The line termination device is adapted to receive the first optical signal, modulate the second amplification optical signal; and inject the modulated second signal into the network. | 10-29-2009 |
20090274458 | COMPACT OPTICAL MULTIPLEXER AND DEMULTIPLEXER - Consistent with the present disclosure, an arrayed waveguide grating (AWG) is provided that includes first inputs and second inputs. Each of the first inputs receives a corresponding one of a plurality of first optical signals, each of which has a corresponding one of a plurality of wavelengths. Second inputs are also provided, such that each second input is preferably provided between two adjacent first inputs. Each of the second inputs receives a corresponding one of a plurality of second optical signals, and each of the second plurality of optical signals has a corresponding one of those wavelengths. Each of the first plurality of optical signals, however, has a first polarization and each of the second plurality of optical signals has a second polarization different than the first polarization. Since the first optical signals are supplied through AWG inputs that are offset from the inputs that receives second optical signals, the first optical signals are supplied at a first AWG output that is spaced from a second AWG output that supplies the second optical signals. The second optical signals are supplied through the second output even though the second optical signals have the same (or substantially the same) wavelengths as the first optical signals. Accordingly, a single AWG may be provided to multiplex both first and second optical signals, thereby simplifying PIC design. | 11-05-2009 |
20090304382 | CONTROL/MONITOR TERMINAL - Address setting and initial data setting of an oil-resistant, water-resistant control/monitor terminal for performing address setting and initial setting of control/monitor terminals of a transmission control system in an oil-mist or humid environment. Also provided is optical communications or electromagnetic induction through a light transmission window provided in the control/monitor terminal using a data-setting-circuit-equipped console. | 12-10-2009 |
20090310963 | DYNAMIC OPTICAL DEVICES - The invention provides an optical device, including a light-transmissive substrate, and a pair of different, parallel gratings including a first grating and second grating, located on the substrate at a constant distance from each other, each of the pair of parallel gratings including at least one sequence of a plurality of parallel lines, wherein the spacings between the lines gradually increase from one edge of the grating up to a maximum distance between the lines, and wherein the arrangement of lines in the second grating is in the same direction as that of the first grating. A system utilizing a plurality of such optical devices is also disclosed. | 12-17-2009 |
20100008665 | Optical access system for dual service network - The present invention relates to an optical access system for dual service network, which mainly comprises an optical modulation device which is used to receive on-off keying (OOK) signal from cable network and radio frequency (RF) signal from wireless network, the optical modulation device then modulates the OOK signal and the RF signal to an optical signal and send out an output optical signal. Lastly, the output optical signal is being delivered to an optical receiving device through an optical fiber transmission channel, and the optical receiving device can access the OOK signal and RF signal from the output optical signal. In addition, the present invention does not require remote nodes (receiver side) to use any optical filter to discern on-off keying signal from cable network and RF signal from wireless network. The present invention can also apply to the field of wavelength-division multiplexing system. | 01-14-2010 |
20100014857 | Method of mapping OPUke into OTN frames - The present invention discloses a method of mapping Optical Payload Unit (OPU) k (k=1, 2, 3 or any positive integer) Ethernet signals (E) into Optical Transport Network (OTN) frames for 10 Gigabit Ethernet (10 GbE) Local Area Network Physical Layer (LAN PHY), wherein OPUk Overhead (OH) is altered by the relocation of Justification Control (JC) bytes, from the standardized ITU-T G.709 locations, into the novel locations of rows | 01-21-2010 |
20100021159 | OPTICAL TRANSPORT SYSTEM ARCHITECTURE FOR REMOTE TERMINAL CONNECTIVITY - The invention pertains to optical fiber transmission systems, and is particularly relevant to transmission of high volume of data and voice traffic among different locations. In particular, the improvement teaches the use of a single optical transport system for both metropolitan area transport and long haul transport of data and voice traffic. | 01-28-2010 |
20100027994 | Phase Modulation Of An Optical Orthogonal Frequency Division Multiplexing Signal - A method includes generating an optical orthogonal frequency division multiplexing OFDM signal with in-phase and quadrature-phase components; varying an RF carrier according to the in-phase and quadrature-phase components; and modulating a phase of a lightwave carrier according to the varied RF carrier to generate an optical OFDM signal with equalized amplitude. | 02-04-2010 |
20100074617 | Optical pulse time spreading apparatus and optical multiplex transmitting system with multiplexed channels and S/N ratio increased - Super-structured fiber Bragg gratings (SSFBGs) of s optical pulse time spreaders are provided with N unit FBGs disposed starting from an input/output end in the order of first to N-th unit FBGs, where s is a parameter less than or equal to a parameter N, a natural number. The unit FBGs are configured such that the reflectivities of the unit FBGs placed from one end to the center of the SSFBG formed in an optical fiber are monotonically increased, while the reflectivities of the unit FBGs placed from the center to the other end of the SSFBG are monotonically decreased. The chip pulses in a pulse train are given relative phases such that the relative phase of the first chip pulse is equal to zero, the relative phase of the second chip pulse is equal to a phase difference d | 03-25-2010 |
20100080555 | METHOD AND ARCHITECTURE FOR PROVIDING HIGH BANDWIDTH BROADBAND COMMUNICATION TO FAST MOVING USERS - A wireless communication network architecture | 04-01-2010 |
20100080556 | CHROMATIC DISPERSION COMPENSATION DESIGN SYSTEM AND CHROMATIC DISPERSION COMPENSATION DESIGN METHOD - A chromatic dispersion compensation design system includes: an input unit that inputs information of an optical network having a plurality of nodes optically coupled to each other via an optical transmission path; an allowable range determining unit that determines an allowable range of a residual chromatic dispersion with respect to every wavelength path of a plurality of signals from a starting node to a terminal node, based on the information of the optical network; and a calculation unit that calculates a wavelength path capacity in the allowable range of the residual chromatic dispersion, in view of a chromatic dispersion variability of each optical element in the optical network. | 04-01-2010 |
20100092169 | Multi-Level Distributed Fiber Optic Architectures - A fiber optic network having a multi-level architecture is disclosed. A first level of the fiber optic network comprises a first branch. The first branch comprises a plurality of first branch optical fibers optically coupled to a distribution cable and a first branch fiber optic network device. The first branch fiber optic network device is configured to optically couple a first predetermined one of the plurality of first branch optical fibers to a respective first predetermined sub-branch optical fiber, and a second predetermined one of the plurality of first branch optical fibers to a second predetermined sub-branch optical fiber. A second level of the fiber optic network comprises a sub-branch. The sub-branch comprises a first sub-branch fiber optic network device and a second sub-branch fiber optic network device. The first sub-branch fiber optic network device is configured to optically couple a first drop cable with the respective first predetermined sub-branch optical fiber and thereby to the distribution cable. The second sub-branch fiber optic network device is configured to optically couple a second drop cable with the respective second predetermined sub-branch optical fiber and thereby to the distribution cable. | 04-15-2010 |
20100111525 | Multiple Input, Multiple Output (MIMO) Communication via Multimode Media - Multiple input, multiple output (MIMO) communication systems and a method using multimode media are provided. A MIMO communication system includes an array of emitters that receives a data signal and outputs a plurality of signals (e.g., modulated light, or other signal types) representative of the data signal, a multimode medium (e.g., a multimode fiber, a fiber bundle, a bundle of cables) that receives the plurality of signals from the array of emitters and carries the plurality of signals in a plurality of modes, and an array of detectors that receives the plurality of signals carried by the multimode medium and outputs the data signal. The system can include a demultiplexer that demultiplexes a single high-speed data stream into the array of emitters as the data signal. The system can also include a multiplexer that multiplexes the data signal from the array of detectors back into the single high-speed data stream. | 05-06-2010 |
20100135655 | Multichannel Polarization Control for Polarization Multiplexed Optical Transport Networks - A system and method are provided for calibrating orthogonal polarity in a multichannel optical transport network (OTN) receiver. The method accepts a composite signal and separates the polarization of the signal into a pair of 2 | 06-03-2010 |
20100135656 | OPTICAL ORTHOGONAL FREQUENCY DIVISION MULTIPLEXED COMMUNICATIONS WITH NONLINEARITY COMPENSATION - The present invention discloses a transmitter and receiver for optical communications system, which provide compensation of the optical link nonlinearity. M-PSK modulating is used for data embedding in an optical signal in each WDM channel using orthogonal frequency division multiplexing (OFDM) technique. At the receiver side electrical output signals from a coherent optical receiver are processed digitally with the link nonlinearity compensation. It is followed by the signal conversion into frequency domain and information recovery from each subcarrier of the OFDM signal. At the transmitter side an OFDM encoder provides a correction of I and Q components of a M-PSK modulator driving signal to compensate the link nonlinearity prior to sending the optical signal to the receiver. | 06-03-2010 |
20100142947 | APPARATUS AND METHOD FOR PSEUDO-INVERSE MULTIPLEXING/DE-MULTIPLEXING TRANSPORTING - A pseudo-inverse multiplexing/de-multiplexing apparatus and method are disclosed. The pseudo-inverse multiplexing apparatus maps a client signal to an OPUk-Xpv signal. The OPUk-Xpv signal has a payload area that can be segmented into a plurality of tributary slots and an overhead area into which frame configuration information related to the tributary slots is inserted. The pseudo-inverse multiplexing apparatus decides the number of tributary slots to be used to map client signals, according to a bit rate or bit tolerance of the client signals, and maps the client signals using the determined number of tributary slots. Accordingly, it is possible to map or frame a variety of client signals. | 06-10-2010 |
20100150553 | METHOD AND APPARATUS FOR GENERATING OPTICAL SHORT PULSE FOR QUANTUM CRYPTOGRAPHY COMMUNICATION - A method and apparatus for generating an optical short pulse for quantum cryptography communication is provided. The apparatus is incorporated as a module in an electronic integrated circuit chip, such as a field programmable gate array (FPGA) chip which performs quantum key distribution post-processing and open channel optical signal processing of a quantum cryptography system. The apparatus generates an electrical short pulse and converts the electrical short pulse into an optical short pulse, and it is possible to manufacture a compact apparatus for generating an optical short pulse for quantum cryptography communication. | 06-17-2010 |
20100196004 | TOPOLOGICALLY MULTIPLEXED OPTICAL DATA COMMUNICATION - Systems and methods for encoding information in the topology of superpositions of helical modes of light, and retrieving information from each of the superposed modes individually or in parallel. These methods can be applied to beams of light that already carry information through other channels, such as amplitude modulation or wavelength dispersive multiplexing, enabling such beams to be multiplexed and subsequently demultiplexed. The systems and methods of the present invention increase the number of data channels carried by a factor of the number of superposed helical modes. | 08-05-2010 |
20100209102 | ENCODING FIBRE CHANNEL OVER ETHERNET TRANSPORT - In one embodiment, data words and ordered sets in a Fibre Channel data stream are formed into a group and the ordered sets are moved to the beginning word positions of the group. The ordered sets are encoded so that a control character in the first byte of the ordered set is replaced with a control code byte encoding the original location of the ordered set in the group, the identity of the control character replaced by the control code byte, and whether the following word is an ordered set. | 08-19-2010 |
20100215364 | Optical Multiplexer System - The optical multiplexer system comprises an optical multiplexer, an output path and an adjustable beam steering element. The optical multiplexer comprises an input port characterized by an original acceptance range. The output path is disposed relative to the optical multiplexer such that a light beam incident on the input port within the original acceptance range enters the output path. The adjustable beam steering element is located adjacent the input port and is adjustable such that a light beam incident on the beam steering element within an enhanced acceptance range enters the output path as an output beam. The enhanced acceptance range is at least angularly greater than the original acceptance range. | 08-26-2010 |
20100215365 | OPTICAL MODULATOR AND OPTICAL COMMUNICATION SYSTEM - The optical modulator comprises an optical branching unit branching incident light into a first signal light and a second signal light; a first Mach-Zehnder modulator modulating the first signal light; a second Mach-Zehnder modulator modulating the second signal light; a phase shifter giving a fixed phase shift to the phase of the output light from the second Mach-Zehnder modulator; and an optical multiplexer multiplexing the output light from the first Mach-Zehnder modulator and the output light from the phase shifter. The phase shifter gives the phase shift so that the two input lights to the optical multiplexer have a phase difference of 60 degrees, and the first and second Mach-Zehnder modulators are driven by three-level signals. | 08-26-2010 |
20100239248 | Optical interleavers and de-interleavers - An apparatus includes one or more optical de-interleavers. Each optical de-interleaver includes an optical component having a first pair of optical input and output ports and a second pair of optical input and output ports and a 1×2 optical coupler. Each optical output port of the optical component is optically connected to a corresponding optical port of the 1×2 optical coupler. The optical component is constructed to operate as a first optical filter for light propagating between the optical ports of the first pair and is constructed to operate as a second optical filter for light propagating between the optical ports of the second pair. The first and second optical filters have substantially regularly spaced and interleaved passbands. | 09-23-2010 |
20100266276 | BROADBAND AND WAVELENGTH-SELECTIVE BIDIRECTIONAL 3-WAY OPTICAL SPLITTER - Embodiments of a bidirectional 3-way optical splitter are described. This bidirectional 3-way optical splitter includes an optical splitter having: a first external node, a second external node, a third external node, and a fourth external node. In one mode of operation, the optical splitter may be configured to receive an external input optical signal on the first external node and to provide external output optical signals on the other external nodes. Moreover, in another mode of operation, the optical splitter may be configured to receive the external input optical signal on the third external node and to provide the external output optical signals on the other external nodes. | 10-21-2010 |
20100284690 | APPARATUS AND METHOD FOR SUPPORT OF DIMMING IN VISIBLE LIGHT COMMUNICATION - A method and system for visible light communication (VLC) for use in a dimmable lighting environment is provided. The method includes transmitting data using light from at least one light source, a brightness of the light reduced below a maximum level. The method also includes compensating or accommodating for the reduced brightness of the light at a VLC circuitry to maintain communication. The method further includes transmitting data to at least one VLC receiver using the light from the at least one light source. | 11-11-2010 |
20100290781 | Microbend-Resistant Optical Fiber - Disclosed is an improved, single-mode optical fiber possessing a novel coating system. When combined with a bend-insensitive glass fiber, the novel coating system according to the present invention yields an optical fiber having exceptionally low losses. | 11-18-2010 |
20100329670 | RECEIVER FOR OPTICAL TRANSVERSE-MODE-MULTIPLEXED SIGNALS - A representative optical receiver of the invention receives an optical transverse-mode-multiplexed (TMM) signal through a multimode fiber that supports a plurality of transverse modes. The optical receiver has a plurality of optical detectors operatively coupled to a digital signal processor configured to process the TMM signal to determine its modal composition. Based on the determined modal composition, the optical receiver demodulates each of the independently modulated components of the TMM signal to recover the data encoded onto the TMM signal at the remote transmitter. | 12-30-2010 |
20110026920 | Systems and Methods of Supporting Powerline Communications - Systems and methods for supporting communications over powerlines are provided. The system can include a frequency and amplitude selective optical converter coupled to a powerline, an optical multiplexer coupled to the optical converter and an optical demultiplexer coupled to the optical multiplexer. The optical converter can be tuned to a frequency and amplitude corresponding to voice or data communication signals carried on the powerline. | 02-03-2011 |
20110044686 | Method and Device for Mapping and Demapping A Client Signal - A method and a device for mapping and demapping a client signal are provided. The method for mapping a client signal includes: dividing a part or all of a payload area of an Optical Channel Payload Unit (OPU) or Optical channel Data Tributary Unit (ODTU) into several sub-blocks, in which the sub-blocks have a size of N bytes, and N is greater than or equal to 1; and mapping a client signal to be transported to the sub-blocks of the payload area with an N-byte granularity. In the technical solutions, when the client signal is mapped, block mapping of the client signal is performed by using a mapping granularity of a block, so that the complexity of the mapping process of the client signal can be reduced, thereby meeting requirements of multi-rate services. | 02-24-2011 |
20110052190 | Discovery of an Adjacent Network Element within a Network Data Plane - The present invention provides a system, apparatus and method for discovery of network elements, which are adjacent within the network data plane but may or may not be adjacent in the network control plane. In one embodiment of the present invention, digital network elements, with a plurality thereof having a lambda switching capability (hereinafter “LSC”) interface, is provided. A digital network element with an LSC interface originates and sends a local advertisement to its immediate control neighbor. Using this LSC originated advertisements; a neighboring network element may be discovered that is adjacent on the network data plane. | 03-03-2011 |
20110058809 | Thermally optimized microwave channel multiplexing device and signals repetition device comprising at least one such multiplexing device - A microwave channel multiplexing device comprises several elementary filters connected in parallel with a common output port by way of a transverse waveguide, each filter comprising a lower end fixed to a support common to all the filters and an upper end away from the support, an external peripheral wall, at least one internal cavity defining an internal channel, a signal input connected to the internal cavity and a signal output connected to the transverse waveguide. The multiplexing device furthermore comprises a conducto-radiative device coupled mechanically and thermally to at least two filters, the conducto-radiative device comprising at least one thermally conducting plate, and linked to the external peripheral walls of each of said at least two filters, the plate being fixed at the level of the upper end of the filters. The invention applies to the field of satellite telecommunications and more particularly to signals repetition devices aboard satellites. | 03-10-2011 |
20110064405 | FLEXIBLE AND INTEGRATED FRAME STRUCTURE DESIGN FOR SUPPORTING MULTIPLE TOPOLOGIES WITH VISIBLE LIGHT COMMUNICATION - For use in a visible light communication (VLC) network, a system and method for communicating a plurality of medium access control (MAC) frames. The method includes providing a single frame structure to support a plurality of topologies, the plurality of topologies including peer-to-peer, broadcast, star and visibility topologies. The method also includes transmitting a plurality of frames comprising a plurality of frame types, the plurality of frame types comprising data, beacon, command, acknowledgement, and color-visibility-dimming (CVD) frames. | 03-17-2011 |
20110116792 | Optical Network Interface Module Using a Hardware Programmable Optical Network Interface Engine - An optical network interface (ONI) module has two main components: an optoelectronic front-end and a general purpose hardware-programmable optical network interface engine. The ONI engine is hardware programmable, allowing the user to configure the overall ONI module with different optoelectronic front-ends and for use with different host modules. In this way, the ONI module can be configured for different applications and protocols. | 05-19-2011 |
20110116793 | METHOD, DEVICE, AND SYSTEM FOR MULTIPLEXING AND MAPPING OPTICAL SIGNALS AND DEMULTIPLEXING AND DEMAPPING OPTICAL SIGNALS - A method, device, and system for multiplexing and mapping optical signals and demultiplexing and demapping optical signals are provided. The method for multiplexing and mapping optical signals includes the following steps: A label object that indicates a multiplexing and mapping relation is acquired. The label object includes a label and a label header. The label includes a type indication field and a TS indication field. The label object predefines a multiplexing and mapping policy about a first optical signal on a first optical channel and a second optical signal on a second optical channel. The first optical signal is multiplexed and mapped to the second optical signal according to the multiplexing and mapping policy. Therefore, when optical signals are multiplexed and mapped and are demultiplexed and demapped, so that an advantage of saving signaling overhead is realized. | 05-19-2011 |
20110123192 | Optical Under-Sampling And Reconstruction Of Sparse Multiband Signals - A scheme for reconstructing multiband signals that occupy a small part of a given broad frequency range under the constraint of a small number of sampling channels. The multirate sampling scheme (MRS) entails gathering samples at several different rates whose sum is significantly lower than the Nyquist sampling rate. The number of channels does not depend on any characteristics of a signal. The reconstruction method may or may not rely on the synchronization between different sampling channels. The scheme can be implemented easily with optical sampling systems. The optical pulses required for the under-sampling are generated by a combination of an electrical comb generator and an electro-absorption optical modulator | 05-26-2011 |
20110135302 | APPARATUS AND METHOD FOR PACKET-OPTICAL INTEGRATED TRANSPORT - A packet-optical integrated transport apparatus includes a packet transmitter for outputting single-wavelength signal multiplexed to a preset channel on the basis of packet traffic or circuit traffic input from a metro access region, and an optical transmitter for multiplexing the single-wavelength signal output from the packet transmitter to a multi-channel wavelength signal and adding or dropping the multiplexed multi-channel wavelength signal to or from a node. The apparatus further includes a system controller for transmitting constituent element initialization information to the packet transmitter and the optical transmitter and receiving constituent element operation status information. | 06-09-2011 |
20110142446 | OPTICAL TRANSMITTER ADAPTATION TO NETWORK TOPOLOGY - The present invention provides a system, apparatus and method to efficiently switch from one modulation format to another modulation format based upon a current route or path through a network topology of a network communication system. According to various embodiments of the invention, a network topology map is generated identifying one of a plurality of paths upon which a data stream is transmitted from a transmitter to a receiver within a network, the transmitter transmitting the data in a respective one of a plurality of data modulation formats. One or more characteristics related to one of the plurality of optical paths is measured and, based upon such measurement, a desired modulation format is selected. Upon a change in the network topology, the process is repeated such that the modulation format is continuously optimized with respect to the network topology. | 06-16-2011 |
20110150464 | Orbital Angular Momentum In Spatially Multiplexed Optical Fiber Communications - Multiple light beams are launched into a single optical fiber, each respective light beam with a corresponding signal. Each of the respective multi-beams are separated by launching each of the light at a different incidence angle and/or input position, into the optical fiber. In this way, each light beam is able to propagate independently according to its own trajectory inside the fiber. The resultant multi light beams propagate with respective counter cyclical orbital angular momentum with respective helical paths. | 06-23-2011 |
20110150465 | OPTICAL SIGNAL TRANSMISSION SYSTEMS, TRANSMITTERS, RECEIVERS, AND OPTICAL SIGNAL TRANSMISSION METHOD - An optical signal transmission system comprises a transmitter that phase-modulates two optical signals of a same frequency by asymmetrically chirping the two optical signals, combines the two optical signals that have been phase-modulated as polarization components according to polarization multiplexing, and transmits an optical signal that has been combined and obtained; and a receiver that receives said optical signal from said transmitter, compresses pulses of at least one of the polarization components of the optical signal, and splits the optical signal into two polarization components. | 06-23-2011 |
20110158644 | IN OR RELATING TO MULTICARRIER COMMUNICATION - The invention relates to improvements in or relating to multicarrier communication and includes a method and a system for communication between an optical line terminal and a plurality of users over a single optical fibre. A portion of a down-stream optical signal is input to an optical circuit, the downstream signal comprising a plurality of subcarriers modulated at a first frequency, the portion of the downstream optical signal is processed at the optical circuit to remove the plurality of subcarriers and to change the first frequency into a second frequency. The processed portion of the downstream signal is then used for communication in the upstream direction. | 06-30-2011 |
20110164875 | SYSTEMS AND METHOD FOR ROUTING OPTICAL SIGNALS - Systems and a method for routing optical signals are disclosed. One system includes a first large core hollow metal waveguide configured to guide a substantially coherent optical beam. A second large core hollow waveguide is optically coupled to the first waveguide with a coupling device. The coupling device is configured to divide the coherent optical beam into a transmitted beam and a reflected beam. Beam walk-off within the coupling device causes the transmitted beam to be shifted by an offset amount. The second large core hollow metal waveguide is shifted from the first large core hollow metal waveguide by approximately the offset amount to receive the shifted transmitted beam. | 07-07-2011 |
20110170864 | INTERFACE DEVICE, DEMULTIPLEXING METHOD, AND MULTIPLEXING METHOD - An interface device for demultiplexing, from a first frame in a transport network, a plurality of second frames multiplexed into the first frame is provided. The interface device includes an extractor configured to extract a plurality of data groups to constitute the first frame, and a second frame generator configured to create the second frames based on the plurality of data groups extracted by the extractor. | 07-14-2011 |
20110170865 | MAPPING METHOD, APPARATUS, AND SYSTEM FOR DATA TRANSMISSION - A mapping method, an apparatus, and a system for data transmission are provided, so as to solve a problem that mapping between a Passive Optical Network (PON) service transmission path and a Pseudo Wire (PW) and/or a Packet Switched Network (PSN) tunnel cannot be realized on a premise of ensuring Quality of Service (QoS) of data transmission. Data packets are classified according to own attribute information in PSN tunnel information and/or PW information. When Multi Protocol Label Switch (MPLS) tunnel information carried in the data packets includes the PSN tunnel information or the PW information, the data packets are classified according to Class of Service (CoS) information, and/or label information in the PSN tunnel information or the PW information; and then the classified data packets are respectively mapped to service transmission paths of different PONs. The invention is applied to a PON to support packet switching technology. | 07-14-2011 |
20110176803 | SYSTEM AND METHOD FOR INDOOR POSITIONING USING LED LIGHTING - A system for performing indoor positioning using a Light Emitting Diode (LED) lighting unit is provided. The system includes the LED lighting unit for determining whether transmission packet data exists in a frame to be transmitted, modulating the transmission packet data in accordance with a predetermined method in order to maintain a uniform brightness of the LED lighting unit when the transmission packet data exists, and transmitting the frame including the modulated transmission packet data. The system also includes a mobile terminal for receiving the frame, demodulating the modulated transmission packet data to determine the transmission packet data, and performing indoor positioning by using the demodulated transmission packet data and information included in the frame. | 07-21-2011 |
20110188855 | COUPLED SYSTEM MULTI-CORE FIBER, COUPLING MODE MULTIPLEXER AND DEMULTIPLEXER, SYSTEM FOR TRANSMISSION USING MULTI-CORE FIBER AND METHOD FOR TRANSMISSION USING MULTI-CORE FIBER - The multi-core fiber of the present invention uses a multi-core fiber configuration, compatible with the “coupled” operation mode in which coupling between cores is positively utilized, to carry out mode division multiplexing transmission via a multi-core fiber that contains multiple single-mode cores in one optical fiber. The multi-core fiber of the present invention uses a configuration in which mode multiplexing transmission is carried out using a multi-core fiber that contains multiple single-mode cores in one optical fiber, wherein multiple cores are strongly coupled intentionally to form a coupled multi-core fiber that makes the coupled modes correspond, one to one, to the transmission channels. | 08-04-2011 |
20110229130 | VISIBLE RAY COMMUNICATION SYSTEM, TRANSMISSION APPARATUS, AND SIGNAL TRANSMISSION METHOD - Disclosed is a visible ray communication system including a transmission apparatus and a reception apparatus, wherein the transmission apparatus includes: a plurality of light emitting devices; an S/P converter for serial-to-parallel converting transmission data, thereby generating N data streams; a modulator for modulating the generated N data streams for respective carriers with a predetermined number of dimensions, thereby generating N modulated signals; a carrier signal multiplier for multiplying the generated N modulated signals by orthogonal N carrier signals, respectively, thereby generating N transmission signals; and a light emitting control unit for illuminating the plurality of light emitting devices according to the generated N transmission signals. | 09-22-2011 |
20110243556 | TRANSCEIVER PHTONIC INTEGRATED CIRCUIT - The present invention provides for a transceiver comprising a transmitter portion and a receiver portion. The transmitter portion includes a laser, the laser providing an optical signal having one of a plurality of wavelengths. The optical signal from the laser is modulated to create a first wavelength-division multiplexed signal at an output of the transceiver. The optical signal from the laser is also used by a demultiplexer to demultiplexer a second wavelength-division multiplexed signal at an input of the transceiver. The use of the optical signal from the laser in both modulation and demodulation of wavelength-division multiplexed signals results in a transceiver having fewer discrete components resulting in a compact design and reduced costs. | 10-06-2011 |
20110262132 | Daisy Chainable ONU - Embodiments of a scalable optical network unit (ONU) architecture for multi-dwelling units (MDUs) that has a low initial cost (or first port cost) and a low maintenance cost are provided herein. The ONU architecture is scalable in that a growing number of end users can share a single drop fiber that couples the ONU to a passive optical network. The ONU architecture utilizes a multiplexer module to allow the ONU to be daisy chained with one or more additional ONUs. | 10-27-2011 |
20110262133 | Time synchronization method and system for a passive optical network system - The invention discloses a time synchronization method and system for a passive optical network (PON) system to solve the problem that an ONU cannot be synchronized with an OLT accurately in the PON. The invention implements the time information synchronization between the ONU and the OLT by using a management path. The time information includes an information transmission delay between the ONU and the OLT and the sending time identifier information of the time information. The invention avoids the technical defect of the unfixed delay for an upper layer protocol data message in a GPON by using the characteristic that a PLOAM message or an OMCI message is not segmented during the transmission thereof in the PON, thus ensuring every ONU can be synchronized with the OLT accurately. | 10-27-2011 |
20110286742 | PSEUDO-NOISE INSERTION ON UNACCEPTABLE INPUT DATA SEQUENCE IN OPTICAL NETWORKS - The present disclosure provides systems and methods for inserting pseudo-noise in a data stream based on an unacceptable input data sequence in an optical network thereby preventing unnecessary loss of frame in SONET/SDH or Optical Transport Network (OTN) systems. The present disclosure includes a SONET/SDH or OTN framer, a transceiver, and a method for detecting an unacceptable data sequence or pattern and inserting a keep-alive or pseudo-noise sequence in the data sequence to maintaining framing on subsequent network elements, framers, transceivers, etc. For example, the present invention, upon receiving an unacceptable pattern of zeros or low ones density caused by a loss of signal condition or the like, may insert a pseudorandom noise pattern into the transmitted frame. This allows the downstream network element to continue a frame lock on the incoming signal, and thus keep the frame overhead and data communications channels from being lost. | 11-24-2011 |
20110311225 | METHOD AND DEVICE FOR SENDING UPSTREAM TRANSFER FRAME IN PASSIVE OPTICAL NETWORK - The present invention relates to the Passive Optical Network (PON) technology, and a method for sending an upstream transfer frame in a PON is provided, so as to improve flexibility of a system and satisfy a requirement that an error probability is reduced as low as possible. The method includes: after success of link, sending a preamble according to an allocated time slot, sending a burst synchronization delimiter, and then sending successively a burst header, a Gigabit-Capable Passive Optical Network (GPON) Transmission Convergence (GTC) frame header, and GTC frame data. In the sent synchronization delimiter, the number of non-zeros is the same as the number of zeros, and in a delimiter sequence, the number of non-zeros on odd bits is equal to the number of zeros on even bits, and the number of non-zeros on even bits is equal to the number of zeros on odd bits, the number of zeros on the odd bits is N, the number of non-zeros on the odd bits is M, a relation |N−M|≦1 is satisfied, the number of zeros in a continuous zero group is X, the number of non-zeros in a continuous nonzero group is Y, and a relation |X−Y|≦1 is satisfied. A device for sending an upstream transfer frame in a passive optical network is further provided. | 12-22-2011 |
20110318001 | METHOD AND DEVICE FOR SENDING AND RECEIVING SERVICE DATA - In the field of communications technologies, a method and device for sending and receiving service data provided by embodiments of the present invention may be capable of solving the problem that a network system cannot bear a service of arbitrary rate. The method for sending service data includes: receiving at least one flexible data channel to which service data is adapted; searching for an address of a destination port corresponding to a source port of the at least one flexible data channel; scheduling the at least one flexible data channel to an Optical Channel Data Unit-k (ODUk) frame in the corresponding destination port respectively according to channel indication information corresponding to the at least one flexible data channel; and forwarding the ODUk frame to the destination address through an Optical Transport Network (OTN) line after completing construction of the ODUk frame. The embodiments of the present application are applicable to optical network communications. | 12-29-2011 |
20120014694 | METHOD FOR DATA TRANSMISSION USING AN ENVELOPE ELIMINATION AND RESTORATION AMPLIFIER, AN ENVELOPE ELIMINATION AND RESTORATION AMPLIFIER, A TRANSMITTING DEVICE, A RECEIVING DEVICE, AND A COMMUNICATION NETWORK THEREFOR - The invention concerns a method for transmission of data signals from a transmitting device (BS) to a receiving device (RAH | 01-19-2012 |
20120027407 | METHOD AND DEVICE FOR SENDING UPSTREAM TRANSFER FRAME IN PASSIVE OPTICAL NETWORK - The present disclosure relates to the Passive Optical Network (PON) technology, and a method for sending an upstream transfer frame in a PON is provided, so as to improve flexibility of a system and satisfy a requirement that an error probability is reduced as low as possible. The method includes: after success of link, sending a preamble according to an allocated time slot, sending a burst synchronization delimiter, and then sending successively a burst header, a Gigabit-Capable Passive Optical Network (GPON) Transmission Convergence (GTC) frame header, and GTC frame data. In the sent synchronization delimiter, the number of non-zeros is the same as the number of zeros, and in a delimiter sequence, the number of non-zeros on odd bits is equal to the number of zeros on even bits, and the number of non-zeros on even bits is equal to the number of zeros on odd bits. | 02-02-2012 |
20120039603 | METHOD FOR DATA TRANSMISSION USING A LINC AMPLIFIER, A LINC AMPLIFIER, A TRANSMITTING DEVICE, A RECEIVING DEVICE, AND A COMMUNICATION NETWORK THEREFOR - The invention concerns a method for transmission of a data signal from a transmitting device (BS) to a receiving device (RAH | 02-16-2012 |
20120057867 | OPTICAL USB THIN CARD - Exemplary embodiments of optical USB thin card is disclosed, which includes a substrate, having a space formed inside its packaging layer; a seat, disposed at a position on the substrate while forming an opening on the substrate; a plurality of first contact elements, each being disposed on the seat to be used for connecting electrically with an external device; a plurality of second contact elements, each being disposed on the seat to be used for connecting electrically with an external device; and bidirectional optical transmission module, having a plurality of optical fiber, disposed inside an accommodation space formed by the enclosure of the seat and the substrate; a micro control unit, for processing signals, data and commands of the optical USB thin card. | 03-08-2012 |
20120087656 | Systems and Methods for Extending a Deterministic Fieldbus Network over a Wide Area - The present disclosure provides systems and methods for extending a deterministic network over a wide geographical area. According to one embodiment, an IED may transmit data frames using a deterministic frame-based communication protocol, such as EtherCAT, via a local deterministic fieldbus. A first transceiver may encapsulate the data frames for transmission over a multiplexing synchronized optical network, such as a SONET network. A second transceiver may de-encapsulate the encapsulated data frames and transmit them via a remote deterministic fieldbus, such that communication between the local and remote deterministic fieldbuses is deterministic. Accordingly, an IED may communicate with a high level of determinism and/or in real-time with various components in a power delivery system across a wide geographical area including multiple deterministic fieldbuses. | 04-12-2012 |
20120134670 | TRANSMITTING DEVICE AND TRANSMITTING/RECEIVING DEVICE - A transmitting device includes a first optical transmitting medium, a second optical transmitting medium, and an optical multiplexing portion. The first optical transmitting medium outputs a first optical signal having a predetermined signal cycle. The second optical transmitting medium outputs a second optical signal obtained by delaying the first optical signal by one cycle of the predetermined signal cycle. The optical multiplexing portion is connected to an output side of the first optical transmitting medium and the second optical transmitting medium and generates a third optical signal obtained by multiplexing the first optical signal and the second optical signal. | 05-31-2012 |
20120134671 | CONTINUOUSLY TOWED SEAFLOOR ELECTOMAGNETIC PROSPECTING SYSTEM - A towed system for underwater electromagnetic prospecting for use with a seaward vessel is provided. The towed system comprises a first portion, a second portion, and a tow cable. The first portion is located on the vessel and includes a controller and a power supply system. The second towed portion is for submersion in the water and transmits an electromagnetic waveform and receives a corresponding electromagnetic signal. The tow cable connects the first portion with the second portion. The tow cable includes at least a pair of suitable conductors for delivering to the second portion a power signal generated by the first portion and at least one optical fibre for carrying data communications between the first portion and the second portion. The transmitted and received signals are digitized and this information is sent digitally to the controller in the first portion. | 05-31-2012 |
20120141123 | ADAPTING APPARATUS AND METHOD - The present invention discloses an adapting apparatus and method, the apparatus comprises: an adapter pool, wherein the adapter pool is located between an optical data unit (ODUk) layer and an optical channel (OCh) layer, and the adapter pool comprises one or more adapters which are respectively connected to an OCh layer link and an ODUK layer link; the information that the adapter pool used for managing comprises: information for indicating connectivity of the adapter with the OCh layer link and with the ODUk layer link, and information for indicating an adapter capability of the adapter. The adapting information between MRNs can be described more accurately through the present invention, and the correctness of the route calculation results is guaranteed. | 06-07-2012 |
20120155865 | OPTICAL SIGNAL TRANSMITTER, AND BIAS VOLTAGE CONTROL METHOD - An optical signal transmitter of the present invention includes: two phase modulating portions; a phase shifter which displaces carrier phases of two output lights from the phase modulating portions by π/2; a multiplexing portion which multiplexes two signal lights, carrier phases of the two signal lights being made orthogonal to each other by the phase shifter; a drive signal electrode portion which supplies a differential data signal to each of four paths of interference optical waveguides, each of the two phase modulating portions having the interference optical waveguides, the differential data signal having an amplitude which is equal to a half-wave voltage Vπ of the two phase modulating portions; a drive amplifier which amplifies the differential data signal to be supplied to each of the four paths of the interference optical waveguides; a data bias electrode portion which supplies a total of four data bias voltages to two arms, each of the two phase modulating portions having the two arms; an orthogonal bias electrode portion which supplies an orthogonal bias voltage to the phase shifter; a data bias power supply portion that adjusts delay times in the two phase modulating portions by applying the data bias voltages to the data bias electrode portion; an orthogonal bias power supply portion that adjusts a delay amount relative to a light output from at least one of the two phase modulating portions by applying the orthogonal bias voltage to the orthogonal bias electrode portion; a dither signal adding portion that adds a dither signal to at most three of the four data bias voltages; a dither detecting portion which detects a wave that is n-times a dither component from an output of the multiplexing portion (where n is an integer equal to or greater than one); and an orthogonal bias control portion which feeds back a detection result of the dither detecting portion to the orthogonal bias power supply portion. The orthogonal bias power supply portion adjusts the delay amount relative to the light output from at least one of the two phase modulating portions by controlling the orthogonal bias voltage to be applied to the orthogonal bias electrode portion based on feedback from the orthogonal bias control portion. | 06-21-2012 |
20120183290 | SOURCE-MULTIPLEXED PULSE AMPLITUDE MODULATION (PAM) OPTICAL DATA COMMUNICATION SYSTEM AND METHOD - An optical signal representing digital data is produced by an opto-electronic semiconductor device having a group of three or more opto-electronic light sources that emit optical signals in accordance with a pulse amplitude modulation (PAM) scheme. The optical signal can be transmitted through an optical fiber coupled to an assembly containing the opto-electronic semiconductor device. | 07-19-2012 |
20120189303 | OPTICAL TRANSPORT MULTIPLEXING CLIENT TRAFFIC ONTO PARALLEL LINE SYSTEM PATHS - An optical line card system includes one or more input interfaces for receiving information, a line interface comprising a plurality of line transponders, and a multiplexer for multiplexing output of the one or more input interfaces onto the plurality of line transponders. The one or more input interfaces have an aggregate information rate R | 07-26-2012 |
20120189304 | METHOD, APPARATUS, AND SYSTEM FOR ASSIGNING TRIBUTARY PORT NUMBER - Embodiments of the present invention relate a method, an apparatus, and a system for assigning a tributary port number. The method includes: receiving a service path request message which is sent by a neighboring node and carries a service type; determining, according to the service path request message, an OTU link used to bear the ODU service, determining and reserving, according to the service type in the service path request message, a free tributary slot resource used to bear the ODU service in the OTU link, and assigning a tributary port number to the free tributary slot resource; and sending a service path acknowledgment message to the neighboring node. | 07-26-2012 |
20120213514 | OPTICAL CONVERTER WITH ADC BASED CHANNELIZER FOR OPTICAL LNB SYSTEM - Systems and methods in accordance with embodiments of the invention convert satellite signals to an intermediate frequency signal and selecting modulated digital data within the satellite signals for content decoding. One embodiment includes an optical low noise block converter (LNB) including a digital channelizer switch configured to select at least one content channel from an input signal including a plurality of content channels modulated onto a carrier and to output an optical signal including the selected at least one content channel. | 08-23-2012 |
20120230685 | TRANSMITTER AND RECEIVER FOR TRANSCEIVING OPTICAL SIGNALS - A transmitter for transmitting an optical signal based on a baseband signal, including an up-transformer for up-transforming the baseband signal to obtain a bandpass signal and a converter for converting the bandpass signal into a signal having a DC-offset. The transmitter further includes a modulator for modulating a light source with the signal having the DC-offsets to transmit the optical signal. | 09-13-2012 |
20120230686 | SYNCHRONIZATION PROCESS IN OPTICAL FREQUENCY DIVISION MULTIPLEXING TRANSMISSION SYSTEMS - The present invention discloses a synchronisation method suitable for increasing the receiving speed in the receiving part of an orthogonal optical frequency division multiplexing (OOFDM) transceiver. | 09-13-2012 |
20120269509 | Remote Electronic Component, Such As Remote Radio Head, For A Wireless Communication System, Remote Electronic Component Array And External Distributor Unit - The present invention relates to a remote electronic component, such as a remote radio head, for a wireless communication system, to a remote electronic component array and to an external distributor unit. The electronic component includes at least one optical input connector for connecting the remote electronic component with a control device using an optical data line, at least one optical output connector, and at least one optical splitter/combiner unit that is connected to the at least one input connector for splitting an optical path into a first optical paths connected to an internal circuitry communicating with an antenna and a second optical path connected to an optical output connector to be coupled to at least one second remote electronic component. Alternatively, an external distributor unit with an optical splitter/combiner unit may be provided. | 10-25-2012 |
20120294609 | METHOD AND SYSTEM FOR DATA SYNCHRONIZATION IN PASSIVE OPTICAL NETWORKS - A system and method for data synchronization in Passive Optical Networks are disclosed. According to an embodiment, the present invention provides a method for providing upstream data synchronization in an optical communication network. The method includes sending data from an Optical Network Unit. The data includes a first data frame, which includes a header sequence, a synchronization segment, and a data segment. The synchronization segment includes 66 bits, which includes a first number of bits having nonzero values and a second number of bits having a value of zero. The first number is different from the second number. The method further includes receiving at least the first data frame by an Optical Line Terminal. The method also includes processing the first data frame. The method additionally includes selecting a first segment of the first data frame, the first segment including 66 bits. | 11-22-2012 |
20120315036 | Method And System For Encoding Multi-Level Pulse Amplitude Modulated Signals Using Integrated Optoelectronic Devices - Methods and systems for encoding multi-level pulse amplitude modulated signals using integrated optoelectronics are disclosed and may include generating a multi-level, amplitude-modulated optical signal utilizing an optical modulator driven by two or more electrical input signals. The optical modulator may include optical modulator elements coupled in series and configured into groups. The number of optical modular elements and groups may configure the number of levels in the multi-level amplitude modulated optical signal. Unit drivers may be coupled to each of the groups. The electrical input signals may be synchronized before communicating them to the unit drivers. Phase addition may be synchronized utilizing one or more electrical delay lines. The optical modulator may be integrated on a single substrate, which may include one of: silicon, gallium arsenide, germanium, indium gallium arsenide, polymers, or indium phosphide. The optical modulator may include a Mach-Zehnder interferometer or one or more ring modulators. | 12-13-2012 |
20120328288 | METHOD FOR AGGREGATING MULTIPLE CLIENT SIGNALS INTO A GENERIC FRAMING PROCEDURE (GFP) PATH - Used bandwidth counts for each of multiple client streams are maintained. A used bandwidth count for a client stream is increased when data from the client stream is put in a Generic Framing Procedure (GFP) frame onto the GFP path and is decreased once every time period by allocated bandwidth credits value. The used bandwidth count for a client stream is compared with a bandwidth limit before sending data in the client stream in a GFP frame onto the GFP path. | 12-27-2012 |
20130004167 | OPTICAL FRAME ATTACHED WITH ALIGNMENT FEATURES MICROFABRICTATED IN DIE - A photonic device assembly including a photonic device fabricated on a chip substrate, the chip substrate having a physical alignment feature fabricated therein, and a frame to couple an external optical lens or interconnect to the photonic device. The frame has a frame facet abutted to a complementary facet of the physical alignment feature. An adhesive permanently affixes the frame to the photonic device as aligned by the abutted facets. A method of forming a photonic device assembly includes microfabricating a physical alignment feature in a chip substrate of a photonic device and joining a frame to the chip substrate by abutting a facet of the coupling to a complementary facet of the fabricated physical alignment feature. | 01-03-2013 |
20130004168 | CLIENT SIGNAL ACCOMMODATING MULTIPLEXING APPARATUS AND METHOD - In an apparatus for accommodating and multiplexing asynchronous client signals in which an idle signal is defined, the transmission side transmits client signals after synchronizing the client signals by inserting or removing, with reference to a specific client signal, an idle signal to/from the same type of another client signal, and in the receiving side, a PLL part is shared by recovering a clock from a client signal and distributing the clock for another client signal. | 01-03-2013 |
20130011134 | OPTICAL COMMUNICATION DEVICE - An optical communication device includes a transmitter module and a receiver module. The transmitter module includes a two laser sources, two optical modulators optically coupled to the two light sources, respectively, and an optical coupler, a semiconductor optical amplifier, an optical coupler, four optical band-pass filters or a demultiplexer, and an optical multiplexer optically coupled in series. The laser beams emitted from the two laser sources are converted into four laser beams having different frequencies due to a four-wave mixing effect occurring in the semiconductor optical amplifier. The receiver module includes a demultiplexer and four photoelectric conversion elements to receive the four laser beams respectively and convert them to electrical signals. | 01-10-2013 |
20130011135 | Communication device, communication system and communication method - A communication device includes an addition unit which outputs a result of adding a predetermined number to the number of data blocks of a first signal, a comparison unit which, on the basis of comparison of the addition result with the number of data blocks of a second signal outputs the addition result of subtracting the number of data blocks of the second signal from the addition result, as a selection result, a data insertion unit which, on the basis of comparison of the selection result with the number of data blocks of the first signal, inserts either of the first signal and adjustment data into the second signal, and a storage unit which stores the selection result, and outputs the selection result stored last time to the addition unit, as the predetermined number. | 01-10-2013 |
20130039655 | METHOD OF TRANSFERRING DATA IN A PROJECTILE LAUNCHING DEVICE - A method of transferring data in a projectile launching device includes providing a projectile launching device that has a transmitter and a receiver. An external device also includes its own transmitter and receiver. The receivers are in range with the transmitters. Data is sent from the transmitter on the projectile launching device to the either or both the receiver on the projectile launching device and the receiver on the external device. Data is sent from the transmitter on the projectile launching device to either or both the receiver on the projectile launching device and the receiver on the external device. As a result, the projectile launching device communicates with the external device. | 02-14-2013 |
20130058649 | METHOD AND APPARATUS FOR PROCESSING OPTICAL SIGNALS - A method for processing optical signals includes performing frequency mixing, photoelectric detection, analog/digital conversion, and dispersion compensation on received input optical signals. First-path polarization multiplexing optical signals and second-path polarization multiplexing optical signals. An initialization update process is performed on filter coefficients. Polarization compensation is performed on the first-path polarization multiplexing optical signals and the second-path polarization multiplexing optical signals by using the filter coefficients on which the initialization update is performed to obtain initialized x-path optical signals and initialized y-path optical signals. Preset x-path training sequences and y-path training sequences are synchronized by using the initialized x-path optical signals and the initialized y-path optical signals. If a synchronization result indicates that polarization cross occurs, the polarization cross is rectified. | 03-07-2013 |
20130064543 | OPTICAL TRANSMISSION SYSTEM AND MULTI-CORE OPTICAL FIBER - An optical transmission system includes an optical transmitting unit that outputs at least one optical signal having a wavelength included in an operation wavelength band and a holey fiber that is connected to the optical transmitting unit. The holey fiber includes a core and a cladding formed around the core. The cladding includes a plurality of holes formed around the core in a triangular lattice shape. The holey fiber transmits the optical signal in a single mode. A bending loss of the holey fiber is equal to or less than 5 dB/m at a wavelength within the operation wavelength band when the holey fiber is wound at a diameter of 20 millimeters. | 03-14-2013 |
20130077966 | MULTIMODE BASE STATION AND METHOD OF OPERATION - A base station includes multiple transmitter-receiver elements coupled to multiple antennas. The activation of additional baseband signal processing resources, dynamically mapped via a programmable digital interface module to a subset of the original transmitter-receiver sets in the base station to double capacity of the system or facilitate simultaneous operation of multiple air interface technologies with minimal or no hardware modifications to the base station or cell site. With a base station having four transmitter-receivers, the system transmits and receives the same signal on all transmitter-receivers to provide a 4×2 downlink and a 1×4 uplink. The system can be reconfigured by splitting the transmitter-receiver sets into two logically separate units. An additional base station modem resource is activated to double the capacity of the radio system or to implement a different communication protocol allowing transition between technologies. | 03-28-2013 |
20130101286 | DEMAND ACCOMMODATION DESIGNING SYSTEM AND METHOD - A demand accommodation design system for accommodating a demand specifying a signal transmission route from a start-point node to an end-point node within an optical network includes an analytical unit to acquire at least one optical path candidate for minimizing cost of the optical network by solving an objective function incorporating cost of optical path candidates by bandwidth, the optical path candidate being a candidate for an optical path composing a demand, and a mathematical programming problem employing a constraint condition incorporating a bandwidth of an optical path pattern candidate connecting the start-point node and the end-point node of the demand and a bandwidth of the acquired optical path candidate, the optical path pattern candidate being the acquired optical path candidate itself or being obtained by combining the optical path candidates, and an allocation unit to allocate the demand to the acquired optical path candidate to accommodate the demand. | 04-25-2013 |
20130108262 | MULTI-CHANNEL OPTICAL MODULE | 05-02-2013 |
20130183033 | OPTICAL TRANSMISSION SYSTEM - The present invention relates to an optical transmission system to which a spatial multiplexing optical fiber is applied as a transmission line. The optical transmission system performs optical transmission using the spatial multiplexing optical fiber as an optical transmission line for transmission of signal light. Namely, the optical transmission is carried out in accordance with a modulation format in which a Q-factor of the signal light propagating in certain propagation mode light propagating in the spatial multiplexing optical fiber and a ratio of a signal light power to a square of the shortest distance between modulation symbols in the modulation format satisfy a predetermined relational expression. | 07-18-2013 |
20130209098 | METHOD AND DEVICE FOR RECEIVING MULTI-CARRIER OPTICAL SIGNAL - The present invention relates to a method and a device. The method includes: mixing a multi-carrier optical signal with a local optical signal having the same center frequency as that of the multi-carrier optical signal; performing photoelectric conversion and analog-to-digital conversion on an optical signal obtained through the mixing to obtain a digital signal; performing FFT on the digital signal to obtain a frequency domain signal; grouping the frequency domain signal according to each frequency band corresponding to its respective carrier in the multi-carrier optical signal, and performing IFFT on each frequency domain signal group to obtain a corresponding time domain signal for each carrier; and performing data restoration on each time domain signal corresponding to its respective carrier to obtain data carried on each carrier. The solutions of the present invention only require one set of coherent reception device, and have low cost and low power consumption. | 08-15-2013 |
20130216221 | System and Method Including Modified Bit-Interleaved Coded Modulation - A system and method with a modified bit-interleaved coded modulation with iterative decoding (BICM-ID). Coded and interleaved bits are combined and coded with a second FEC code that is then mapped to a modulation format. The second FEC code may be a single parity check (SPC) and the scheme may be referred to as a SPC-BICM-ID scheme. | 08-22-2013 |
20130230318 | COMMUNICATIONS INTERFACE APPARATUS AND METHOD OF OPERATING THE SAME - There are provided a communications interface apparatus and a method of operating the same. The communications interface apparatus includes: a transmission line including a conductor line and a plastic optical fiber for optical communications; a signal transmitting unit transmitting a first data signal through the plastic optical fiber and transmitting a second data signal through the conductor line; and a signal receiving unit receiving the first data signal and the second data signal, wherein the signal transmitting unit differentiates a signal as the first data signal or the second data signal based on at least one of a level and a frequency of the signal to be transmitted. | 09-05-2013 |
20130236172 | COHERENT OPTICAL RECEIVER DEVICE AND COHERENT OPTICAL RECEIVING METHOD - In a coherent optical receiver device, the dynamic range considerably decreases in the case of selectively receiving the optical multiplexed signals by means of the wavelength of the local oscillator light, therefore, a coherent optical receiver device according to an exemplary aspect of the invention includes a coherent optical receiver receiving optical multiplexed signals in a lump in which signal light is multiplexed; a variable optical attenuator; a local oscillator connected to the coherent optical receiver; and a first controller controlling the variable optical attenuator by means of a first control signal based on an output signal of the coherent optical receiver; wherein the coherent optical receiver includes a 90-degree hybrid circuit, a photoelectric converter, and an impedance conversion amplifier, and selectively detects the signal light interfering with local oscillation light output by the local oscillator out of the optical multiplexed signals; and the variable optical attenuator is disposed in the optical path of the optical multiplexed signals in a stage preceding the photoelectric converter, inputs the optical multiplexed signals, and outputs them to the coherent optical receiver controlling the intensity of the optical multiplexed signals based on the first control signal. | 09-12-2013 |
20130266314 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING VISIBLE LIGHT COMMUNICATION - A visible light communication (VLC) transmitting apparatus modulates source data to an orthogonal frequency division multiplexing (OFDM) symbol according to an OFDM modulation method, inserts a diffusion code that is allocated to the VLC transmitting apparatus into a frequency axis of the OFDM symbol, converts the OFDM symbol in which the diffusion code is inserted to a visible light modulation signal, and transmits the converted visible light modulation signal. Thereby, a signal of the VLC transmitting apparatus in which a VLC receiving apparatus wants can be easily detected. | 10-10-2013 |
20130272698 | ADAPTIVE BIT OR POWER LOADING IN OPTICAL ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING TRANSCEIVERS - The present invention discloses a method for real time optical orthogonal frequency division multiplexing (OOFDM) transceivers by adaptively utilising available channel spectral characteristics. | 10-17-2013 |
20130287394 | HIGH-SPEED OPTICAL FIBER LINK AND A METHOD FOR COMMUNICATING OPTICAL DATA SIGNALS - An optical communications system and method at least doubles the data rate of the optical fiber link without requiring a redesign of the backplane ASIC. This is made possible in part through the incorporation of at least one gearbox integrated circuit (IC) is incorporated into the system that is compatible with the current ASIC design. The gearbox IC receives N lanes of electrical data signals from the ASIC, with each electrical data signal having a data rate of X Gbps, and outputs N/2 lanes of electrical data signals, with each electrical data signal having a data rate of 2X Gbps. The high-speed optical transceiver module receives the N/2 electrical data signals output from the gearbox IC and produces N/2 respective optical data signals having a data rate of 2X Gbps for transmission over the optical fiber link. | 10-31-2013 |
20130287395 | Optical Burst Receiver With a Configurable AC and DC Coupling Interface - A method for enabling AC coupling or DC coupling when receiving burst data signals comprises generating a hold-over pattern, wherein the hold-over pattern is a AC balanced pattern when an AC coupling is required and a low-logic value signal when a DC coupling is required; inputting the generated hold-over pattern to an AC coupling circuit, when no burst data signal is received; inputting only a received burst data signal to the AC coupling circuit, during the reception of such signal; and upon receiving of the entire burst data signal, generating a reset signal causing to input the generated holdover pattern to an AC coupling circuit. | 10-31-2013 |
20130343754 | VARIABLE-LENGTH TRAINING FIELDS IN COAXIAL COMMUNICATIONS - A coaxial physical layer device operates in at least two different modes: a discovery mode and a normal mode. In the discovery mode, a first orthogonal frequency-division multiplexing (OFDM) coaxial signal is received that has a preamble including a plurality of first training fields and at least one second training field. Each first training field is shorter than each second training field. In the normal mode, a second OFDM coaxial signal is received that has a preamble including a single training field. The single training field is shorter than an OFDM symbol. | 12-26-2013 |
20140023363 | SYSTEMS AND METHODS FOR NETWORKING CONSUMER DEVICES - Systems and methods for enrolling nodes into an ad hoc network associated with a multi-roomed structure. Nodes within the ad hoc network comprise a communication module configured to communicate with the ad hoc network using at least one of room-limited communications and room-transparent communications. | 01-23-2014 |
20140029941 | SPATIAL MULTIPLEXING FOR OPTICAL TRANSMISSION - A system includes an optical Y-junction coupler to receive a first modulated optical signal on a wide input path of the optical Y-junction coupler and to receive a second modulated optical signal on a narrow input path of the optical Y-junction coupler, wherein the optical Y-junction coupler generates a combined optical signal from signals received on the wide input path and the narrow input path. A multimode waveguide receives the combined optical signal from the optical Y-junction coupler and propagates a spatially multiplexed optical output signal along a transmission path. | 01-30-2014 |
20140093238 | MULTIPHASE SAMPLING OF MODULATED LIGHT WITH PHASE SYNCHRONIZATION FIELD - A light transmitter transmits multiple light packets, each formatted to include a predetermined phase synchronization field (PSF) and a same message comprising a series of bits. The PSF and each bit are each represented as light that is intensity modulated over a bit period at a corresponding frequency. The light packets are transmitted at different start-times to cause a receiver to sample each packet with a different phase of a fixed, asynchronous sample timeline. The PSF and message are demodulated from each of the sampled light packets. If the demodulated PSF matches the predetermined PSF, then the corresponding demodulated message is declared valid. | 04-03-2014 |
20140099106 | Method and Apparatus for Aligning and Integrating Serial Data Streams - An integrated circuit is incorporated into a communications system to enable a channel to achieve data rates that are at least double that which are currently achievable. The integrated circuit combines serial data signals using recovered clock and serial data signals in reference and non-reference clock domains. The integrated circuit rate converts recovered serial data in one of the clock domains, performs a phase alignment at the converted data rate, and returns the rate converted and phase-aligned serial data to the recovered data rate in response to the recovered clock from the remaining clock domain. Thereafter, the recovered and aligned serial data signals are combined. The phase alignment is monitored in circuitry that detects when a threshold offset is violated. When the threshold offset is violated a synchronization circuit is enabled. | 04-10-2014 |
20140099107 | METHOD AND SYSTEM FOR DATA TRANSMISSION AND COMMUNICATION USING IMPERCEPTIBLE DIFFERENCES IN VISIBLE LIGHT - An exemplary system for communicating data includes a light source that emits light and a processing device that receives and encodes data into a communication signal. A modulator modulates light emitted by the light source, wherein the modulation is imperceptible to the human eye, and the modulated light includes the encoded data. The modulation of the transmitted light is imperceptible to a human eye. A receiving device receives the modulated light and processes the light to decode the encoded signal and obtain the data. | 04-10-2014 |
20140126902 | OPTICAL COMPENSATION USING A SPACE DIVISION MULTIPLEXING ELECTRO-OPTIC RECEIVER - Disclosed herein are methods, structures, and devices for optical communications systems operating through turbulent media. More specifically, a spatial division multiplexing photonic integrated circuit is used in conjunction with digital signal processing systems to mitigate the effects of the turbulent media. | 05-08-2014 |
20140169788 | QUALITY OF SERVICE APPLICATION FOR DIFFERENT DATA FLOW TYPES - A network device is configured to store parameters identifying a respective quality of service (QoS) to apply to corresponding different types of data flows; initiate establishment of a network channel between a source device and a destination device through an optical network; receive first and second data flows destined for the destination device, where the first data flow and the second data flow may have first and second data flow types; identify a first QoS and a different second QoS to apply to the first and second data flows based on the first and second data flow types and based on the parameters; apply the first QoS to the first data flow and the second QoS to the second data flow to form processed first and second data flows; and transmit, via the network channel, the processed first and second data flows towards the destination device. | 06-19-2014 |
20140178065 | NONLINEARITY COMPENSATION USING PILOT TONES - An optical system may have an optical transmitter including a digital signal processor to receive a signal channel, add data corresponding to a pilot tone, generate a digital signal associated with the signal channel and including the pilot tone, and output the digital signal. The optical system may further have a digital-to-analog converter to convert the digital signal to an analog signal, a laser to provide an optical signal, and a modulator to receive the optical signal and the analog signal, and modulate the optical signal based on the analog signal to form a modulated optical signal. The modulated optical signal may include the pilot tone. The optical system may also have an optical receiver to receive the modulated optical signal, process the modulated optical signal to determine a phase associated with the pilot tone, and apply the phase to the modulated optical signal to recover the signal channel. | 06-26-2014 |
20140193149 | Systems And Methods For Implementing Optical And RF Communication Between Rotating And Stationary Components Of A Rotary Sensor System - Systems and methods are disclosed for implementing a rotary sensor system including rotating system components in RF signal and optical signal communication with stationary system components through a rotary coupler. The rotary coupler may be provided with an optical transmission line that passes inside or through the center of an inner conductor of a coaxial RF transmission line that itself extends across the rotational interface/s of the rotary coupler such that optical and RF signal energy may be provided simultaneously or otherwise across the rotary coupler using separate communication paths. A rotary sensor system may be further configured to convert multiple signals and/or types of signals to a common multiplexed optical signal stream for transmission together across an on-axis rotational optical interface of the rotary coupler. | 07-10-2014 |
20140294382 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD USING THE SAME - A communication apparatus includes a first communication unit configured to transmit and receive data using wireless LAN communication and a second communication unit configured to receive data using wireless communication that is different from the wireless LAN communication. The communication apparatus provides data, received through the first communication unit and the second communication unit, to a user terminal connected to a USB communication apparatus. | 10-02-2014 |
20140363158 | FIBER-OPTIC COMMUNICATION APPARATUS CAPABLE OF OPERATING IN A NORMAL MODE AND A POWER CALIBRATION MODE, AND COMMUNICATION DEVICE USED WITHIN THE SAME - A fiber-optic communication apparatus includes first and second communication devices interconnected by an optical fiber cable. The first communication device converts one of a calibration signal with a predetermined power level and a radio frequency (RF) signal into an optical signal. The second communication device converts the optical signal, which is transmitted through the optical fiber cable, into an electrical signal, detects a power level of the electrical signal associated with the calibration signal, obtains a power attenuation ratio based on the power level detected thereby and the predetermined power level, and adjusts the power level of the electrical signal associated with the RF signal based on the power attenuation ratio. | 12-11-2014 |
20140363159 | DIGITAL GENERATION OF MULTI-CARRIER OPTICAL SIGNALS - A transmitter of optical signals uses a single light transmitter to modulate a multi-carrier signal. The multi-carrier signal is generated by performing digital signal processing in the digital domain to generate a plurality of components by performing Hilbert transform filtering. The components are modulated on to an optical transmitter as in-phase and quadrature components, thereby generating a multi-carrier waveform using a single optical transmitter. | 12-11-2014 |
20150078744 | MULTIPLEXED OPTICAL TRANSMISSION LINE, OPTICAL TRANSMISSION SYSTEM, AND OPTICAL TRANSMISSION METHOD - It is difficult in an optical transmission system using a multicore optical fiber to provide high-capacity transmission in which good signal quality is obtained, therefore, a multiplexed optical transmission line according to an exemplary aspect of the present invention includes at least one first optical transmission line propagating first signal light in a first direction; and at least one second optical transmission line propagating second signal light in a second direction opposite to the first direction, wherein the second optical transmission line is disposed in at least one of positions adjacent to the first optical transmission line wherever the first optical transmission line may be disposed. | 03-19-2015 |
20150086199 | COMPACT TWO-STAGE OPTICAL AMPLIFIER - Various exemplary embodiments relate to an optical amplifier, including: a multicore rare-earth doped optical fiber with a first plurality of cores associated with a first stage of the optical amplifier and a second plurality of cores associated with a second stage of the optical amplifier; a three dimensional (3D) waveguide configured to couple input space division multiplexed (SDM) channels into the first plurality of cores at a first end of the multicore rare-earth doped optical fiber and to couple channels from the second plurality of cores to output SDM channels; a reflector configured to optically interconnect the first plurality of cores to the second plurality of cores; and pump laser coupled to the multicore rare-earth doped optical fiber configured to produce laser pump light to pump the multicore rare-earth doped optical fiber. | 03-26-2015 |
20150147056 | OPTICAL/WIRELESS COMMUNICATION APPARATUS, OPTICAL/WIRELESS COMMUNICATION METHOD AND OPTICAL/WIRELESS COMMUNICATION SYSTEM - An object is to provide an optical/wireless communication apparatus capable of communicating with counterpart apparatuses by selectively using optical communication and wireless communication according to the counterpart apparatuses to communicate with, and selecting an arbitrary path and an arbitrary frequency from a plurality of frequencies, and, furthermore, multiplexing signals as may be necessary. An optical/wireless communication apparatus ( | 05-28-2015 |
20150341123 | INTEGRATED CONTROL FOR SILICON PHOTONICS - In an example, the present invention includes an integrated system on chip device. The device is configured on a single silicon substrate member. The device has a data input/output interface provided on the substrate member. The device has an input/output block provided on the substrate member and coupled to the data input/output interface. The device has a signal processing block provided on the substrate member and coupled to the input/output block. The device has a driver module provided on the substrate member and coupled to the signal processing block. In an example, the device has a driver interface provided on the substrate member and coupled to the driver module and configured to be coupled to a silicon photonics device. The device also has an interface configured to communicate between the silicon photonics device and the control block. | 11-26-2015 |
20160013880 | OPTICAL COMPENSATION USING A SPACE DIVISION MULTIPLEXING ELECTRO-OPTIC RECEIVER | 01-14-2016 |
20160028479 | Adaptive Optics Based Simultaneous Turbulence Compensation of Multiple Orbital Angular Momentum Beams - An adaptive optics compensation approach for an OAM multiplexed FSO communication system is described, in which a Gaussian beam is used to probe the turbulence-induced wavefront distortions and derive the correction pattern for compensating the OAM beams. Using this approach, we demonstrate simultaneous compensation of multiple OAM beams each carrying a 100-Gbit/s data channel through emulated atmospheric turbulence. The results indicate that the turbulence-induced crosstalk and power penalty could be efficiently mitigated by ˜12.5 dB and ˜11 dB respectively. | 01-28-2016 |
20160043805 | TRANSMISSION OF A DATA STREAM USING ENHANCEMENT LAYERS OF MULTIPLE HIERARCHICALLY MODULATED OPTICAL WAVES - We disclose an optical transport system configured to transport an additional data stream using hierarchical modulation. In an example embodiment, copies of the additional data stream are encoded onto enhancement layers of multiple hierarchically modulated optical waves transported through the system in a multiplexed manner. An optical receiver coupled to a remote end of the optical transport link is configured to use this redundant transmission of the additional data stream to improve the bit-error rate thereof, e.g., by first extracting the signal components corresponding to the enhancement layers of the different hierarchically modulated optical waves and then combining the extracted signal components in a manner that tends to reduce, through averaging, the relative magnitude of noise in the combined signal compared to that in the individual extracted signal components. The disclosed signal-transmission format is suitable for various types of multiplexing, e.g., any combination of space-, wavelength-, and polarization-division multiplexing. | 02-11-2016 |
20160112139 | OPTICAL SIGNAL PROCESSING APPARATUS, OPTICAL SIGNAL PROCESSING METHOD, AND RECORDING MEDIUM - An optical transmitter includes a discrete multi-tone (DMT) modulation unit that modulates a carrier signal having a specific frequency with an information signal and a carrier signal having a frequency different from the specific frequency with a monitor signal, to generate a DMT modulation signal that multiplexes the information signal and the monitor signal. The optical transmitter includes a laser diode (LD) unit that optically converts the DMT modulation signal to a corresponding optical DMT modulation signal, a frequency extraction unit that extracts a harmonic distortion component of the monitor signal from the optical DMT modulation signal, and a frequency analysis unit. The optical transmitter includes a bias control unit that controls a bias supply unit that adjusts a bias value to be supplied to the LD unit such that the extracted harmonic distortion component of the monitor signal is reduced. | 04-21-2016 |
20160156415 | MULTI-CHANNEL TUNABLE LASER | 06-02-2016 |
20160197677 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING INTERFACE SIGNALS OF DISTRIBUTED BASE STATION | 07-07-2016 |
20160204869 | TRANSMISSION DEVICE, TRANSMITTER, AND TRANSMISSION METHOD | 07-14-2016 |
20160204873 | TWO-LEVEL COSET CODING SCHEME FOR GIGABIT ETHERNET OVER PLASTIC OPTICAL FIBER | 07-14-2016 |