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Optical communications May archived by USPTO category 05/09

20090136229 - Method and system for transmitting information in an optical communication system using distributed amplification: A method and system for transmitting information in an optical communication system includes modulating a non-intensity characteristic of an optical carrier signal with a data signal to generate an optical information signal. The optical information signal is transmitted over an optical link. The optical information signal is amplified over a... Agent: Baker Botts L.L.P.

20090136230 - System and method for managing wavelength drift in an optical network: In accordance with the teachings of the present invention, a system and method for managing wavelength drift in an optical network is provided. In a particular embodiment, the method includes receiving traffic in one or more optical channels transmitted by one or more transmitters, each channel having successive timeslots, each... Agent: Baker Botts L.L.P.

20090136231 - Remote controlling system and gateway apparatus for controlling electronic appliances within space: The present invention provides a remote controlling system for controlling a plurality of electronic appliances within a space, such as a home, an office, etc. Each of the electronic appliances includes a respective radiation-based signal receiver. By use of the remote controlling system, a user can conveniently control the electronic... Agent: Reed Smith LLP

20090136232 - Infrared communication apparatus and infrared communication method: An infrared communication apparatus and method enabling data communication with a receiving device, regardless of a protocol with which the receiving device is compatible. A transmitting unit transmits a first packet to inquire whether a receiving device is compatible with a first protocol and transmits a second packet to inquire... Agent: Oblon, Spivak, Mcclelland Maier & Neustadt, P.C.

20090136233 - Optical transmission system and optical node: Where an integrated monitoring and controlling unit is to control an optical add-drop unit so as to cause transmit signals from the optical transceiver of a first optical node to be received by the optical transceivers of plural different optical nodes, this purpose can be achieved by an optical transmission... Agent: Mcdermott Will & Emery LLP

20090136235 - Probe card with optical transmitting unit and memory tester having the same: Example embodiments provide a probe card having an optical transmitting unit and a memory tester having the probe card. The probe card may include a plurality of needles connected to test terminals formed in a memory, a plurality of first terminals connected to the needles, a plurality of second terminals... Agent: Harness, Dickey & Pierce, P.L.C

20090136234 - Transceiver module sleep mode: In one embodiment, an apparatus comprising an optical transmitter, having an optical transmitter portion and an electrical transmitter portion, and configured to convert an electrical signal to an optical signal, and transmit the optical signal; an optical receiver, having an optical receiver portion and an electrical receiver portion, configured to... Agent: Brake Hughes Bellermann LLP

20090136236 - Optically coupling components of a transceiver: An apparatus comprises one or more electro-optical coupling modules. An electro-optical coupling module comprises a diode, a flexible optical coupling element, a reflective surface, and an optical fiber. The diode performs an electro-optical conversion on a signal. The flexible optical coupling element communicates the signal between the diode and the... Agent: Baker Botts L.L.P.

20090136237 - Coupling structure for optical fibres and process for making it: A coupling structure for coupling optical radiation, i.e., light, between an optical fibre and an optical device, e.g., a laser diode or a photodiode. The coupling structure has an optical through-via which guides the optical radiation to or from the optical fibre. Light exiting the fibre travels through a guidance... Agent: Finnegan, Henderson, Farabow, Garrett & Dunner LLP

20090136238 - Security over an optical fiber link: An apparatus includes an optical transmitter having a first dynamically reconfigurable optical filter, an optical receiver having a second dynamically reconfigurable optical filter. The optical transmitter and optical receive are connected via an optical fiber transmission line. The optical filters are configured to function in a complementary manner.... Agent: Alcatel-lucent

20090136239 - Optical signal transmission control apparatus and optical signal transmission control method: An optical signal transmission control apparatus that controls transmission of optical signals transmitted via a plurality of redundant routes. The optical signal transmission control apparatus includes a delay difference adjusting unit that adjusts a transmission delay difference between the optical signals of each route by converting a wavelength of the... Agent: Staas & Halsey LLP

20090136240 - Balanced phase-shaped binary transmission in optical communications: Optical communication apparatus, methods, systems are provided based on balanced-detection phase-shaped binary transmission (BD-PSBT).... Agent: Fish & Richardson, PC

20090136241 - Optical msk data format: A method of generating an optical minimum shift keying (MSK) modulated signal, a method of pre-coding an input data stream for generation of an optical MSK modulated signal, a method of decoding an optical MSK modulated signal, an MSK transmitter, an encoder structure for encoding an input data stream for... Agent: Mcdermott Will & Emery LLP

20090129770 - Light transmission device and method of setting light input break detection threshold value: According to an aspect of an embodiment, in a light transmission device for switching a light transmission path for receiving an optical signal from a currently used system to a backup system when the light level of light input from a light transmission path of a currently used system becomes... Agent: Fujitsu Patent Center C/o Cpa Global

20090129771 - Design method for wdm optical networks including alternate routes for fault recovery: A procedure for designing WDM optical networks provides both working circuits and protection circuits for carrying traffic demands between node pairs. The protection circuits are activated for the purpose of network recovery in case of a fault on a working circuit. Each protection circuit is link-disjoint, and preferably node-disjoint, from... Agent: Hitt Gaines, PC Alcatel-lucent

20090129772 - Shared mesh signaling method and apparatus: In a mesh network, a network element for providing protection switching in a 1:N shared mesh protection scheme having a first protection path associated with a pair of working paths selected from the N working paths is disclosed. The network element comprising: (a) a link for connecting the network element... Agent: Christopher & Weisberg, P.A.

20090129773 - Method and apparatus for isolating a location of a fault in a passive optical network: A method and apparatus of isolating a location of a fault in an optical network may include using communications traffic signals and network nodes to determine excess power losses without interrupting service or requiring additional external test equipment. A transmit optical network node is configured to measure the transmit power... Agent: Hamilton, Brook, Smith & Reynolds, P.C.

20090129774 - Distributed terminal optical transmission system: Optical signals generated from customer premise equipment (CPE) at the edges of the metro domain networks are facilitated. The CPEs connect to extension terminals that transform the optical signal originating at the CPE into a format for long haul transmission. The optical signal then propagates to a primary terminal where... Agent: Woodcock Washburn LLP

20090129775 - Optical packet switching apparatus and methods: An optical packet switch switches optical packets according to bit-rates at which the optical packets are provided. For example, optical packets that are received at similar bit-rates may be routed to a destination at separate time slots over a single channel wavelength, and optical packets that are received at different... Agent: Dorsey & Whitney LLP Intellectual Property Department

20090129776 - Wavelength-selective switch and method for channel-by-channel switching for a wavelength-selective switch: A wavelength multiplex signal (WDM1, WDM2) having a plurality of channels is supplied to a wavelength-selective switch (WSS1, WSS2) which has a tunable, optical band rejection filter (TUF1, TUF2) at least one input or output. In addition, a controller is provided which is designed such that before a switching operation... Agent: K&l Gates LLP

20090129777 - Systems and methods for distance-proof n-pass auto negotiation for gigabit ethernet: The present invention provides distance-proof N-pass Auto Negotiation systems and methods for Gigabit Ethernet. The present invention distance proofs Auto Negotiation. No matter the distance between two nodes configured according to the systems and methods of the present invention, the link at either end of the two nodes will only... Agent: Clements Bernard PLLC

20090129778 - Raman cancellation and management in catv transport and distribution via rf spectrum inversion: Provided herein are at least one embodiment of a system and method for reducing or eliminating crosstalk and associated distortion in a wavelength-division multiplexed optical signal transmitted over a fiber optic network by inversion of the RF signals that are inputs to the system.... Agent: Scientific-atlanta, Inc. Intellectual Property Dept.

20090129779 - Multiplex delay unit: According to one embodiment, a multiplex delay unit comprises an optical all-pass filter (OAPF) adapted to apply continuously tunable group delay to a wavelength division multiplexing (WDM) signal so that all of its WDM components are delayed by substantially the same delay time. The OAPF has a free spectral range... Agent: Mendelsohn & Associates, P.C.

20090129780 - Optical signal synchronizer: One embodiment of the invention provides an optical signal synchronizer having a plurality of optical channel synchronizers. Each optical channel synchronizer receives a respective input wavelength division multiplexing (WDM) signal and processes it to produce a corresponding output WDM signal, in which optical data packets corresponding to different carrier wavelengths... Agent: Mendelsohn & Associates, P.C.

20090129781 - Optical communication apparatus, optical communication method, and optical communication system: Optical communication apparatuses capable of performing appropriate communication according to a distance to a receiving apparatus, optical communication methods, and an optical communication system are provided. A transmitting apparatus transmits an optical signal corresponding to data. The transmitting apparatus modulates intensity of the optical signal into intensity corresponding to a... Agent: Procopio, Cory, Hargreaves & Savitch LLP

20090129782 - Building illumination apparatus with integrated communications, security and energy management: An LED light and communication system includes one or more optical transceivers that have a light support having a plurality of light emitting diodes and one or more photodetectors attached thereto, and a processor in communication with the light emitting diodes and the one or more photodetectors. The processor is... Agent: Vidas, Arrett & Steinkraus, P.A.

20090129783 - Bi-directional optical module: An optical transceiver is provided which includes: a bi-directional optical subassembly; a printed circuit board which transmits and receives light for the bi-directional optical subassembly; and an outer casing which covers the bi-directional optical subassembly and the printed circuit board. The bi-directional optical subassembly includes: a laser diode; a photodiode;... Agent: Sughrue Mion, PLLC

20090129784 - Scanning method and system for a multiple light beam system: A method and system for scanning a multiple light beam system, such as a safety light curtain, uses a plurality of transmission signals including two or more synchronization signals for synchronizing a beam receiver module with a beam transmission module. The system has transmitter circuitry which generates the transmission signals... Agent: Honeywell International Inc.

20090129785 - Optical amplifying device and optical transmission system: An optical amplifying device includes an amplifying unit for amplifying an optical signal using stimulated emission; a filter unit for attenuating at least part of a band of an output of the amplifying unit other than a main signal band of the optical signal; and an amplification control unit for... Agent: Staas & Halsey LLP

20090129786 - Coupling of optical interconnect with electrical device: One embodiment of the present invention includes a flexible interconnect assembly that can convert between optical and electrical signals and that is configured to be easily secured to an electrical device, such as a printed circuit board or integrated circuit chip. The flexible interconnect assembly includes a flexible substrate and... Agent: Beyer Law Group LLP/ Nsc

20090129787 - Optical coherent receiver, frequency offset estimating apparatus and method for optical coherent receiver: The present invention discloses an optical coherent receiver, and a frequency offset estimating apparatus and a frequency offset estimating method for use in the optical coherent receiver. The optical coherent receiver includes a front end processing section for changing an optical signal into a base band digital electric signal. The... Agent: Staas & Halsey LLP

20090129788 - Optical receiver for receiving a signal with m-valued quadrature amplitude modulation with differential phase coding and application of same: Optical data signal receiver having an optical separation of the received data signal into two signal paths, namely, an amplitude detection path and a phase detection path, wherein the phase detection path is split into an in-phase signal path generating in-phase-signals and a quadrature-signal path generating quadrature-signals, and both the... Agent: Indianapolis Office 27879 Brinks Hofer Gilson & Lione

20090129789 - Method and apparatus for extracting clock signal from optical signal: A clock extraction apparatus capable of supporting even a high-speed optical signal with a simple arrangement is proposed. A π-phase shifted fiber Bragg grating (π-phase shifted FBG) 10 is adjusted in such a manner that a phase difference between reflected light waves resulting from two sub-FBGs 1 and 2 will... Agent: Birch Stewart Kolasch & Birch

20090123146 - Packet optical channel sharing protection method device and system thereof: The present invention discloses a method and system for group optical channel shared protection. In the invention, when a failure occurs, operations are performed on an optical wavelength group, and four actions are accomplished at the time of switching: switching the affected optical wavelength group on the working fiber to... Agent: Ladas & Parry LLP

20090123147 - Test instrument for testing multi-wavelength optical networks using two or more tunable lasers: The present invention relates to test equipment (e.g. TBERD 8000) with two or more Tunable Lasers (TL) for testing the complete spectrum of a DWDM system. Diagnostic software is used to stepwise tune a TL to a specific wavelength under test and simultaneously insert one or more distortion wavelengths while... Agent: Allen, Dyer, Doppelt, Milbrath & Gilchrist P.A.

20090123148 - All-optical csma/cd apparatus in base a ethernet and the method therefor: The invention relates to an Ethernet-based all-optical carrier sense multiple access/collision detection apparatus and method, and more particularly, to an apparatus and method capable of checking by using mutual gain saturation whether distortion occurs in two or more optical signals due to mutual interference when the optical signals pass through... Agent: Ampacc Law Group

20090123149 - End-user optical transceiver unit with transmit signal attentuation: A transceiver unit for use at an end-location in a communications network includes a downstream monitor configured to monitor downstream optical signals that travel from a service provider to the end-location. The downstream optical signals carry downstream data for use by a device in communication with the transceiver unit. At... Agent: Gavrilovich, Dodd & Lindsey, LLP Attn:travis Dodd

20090123150 - Method and system for power control of fibre channel switches: A method and system for controlling power consumption in a fibre channel switch element having a plurality of ports and plural links to communicate over a network is provided. The switch element includes, a power control module that is used to provide power to only active ports after firmware of... Agent: Klein, O'neill & Singh, LLP

20090123151 - Adaptive ont for a pon network: A method for recognizing and adapting to a change in a passive optical network (PON) format by an optical network terminal (ONT) in communication with an optical line terminal (OLT) over the PON includes pre-loading a plurality of transmission formats and content formats into an individual ONT. The method also... Agent: Siemens Corporation Intellectual Property Department

20090123152 - Optical switching device and optical receiver: The invention is an optical switching device and optical receiver having a simpler configuration and capable of short range communication with a larger communication band than those of the prior art. The invention comprises a plurality of nodes and an optical switching device. Each node has an optical receiver and... Agent: Berenato, White & Stavish, LLC

20090123153 - Phase shift keyed high speed signaling: Fiber optic transmission technologies that allow DPSK or even higher order PSK to be performed at 20 gigabits per second per channel or even higher bit rates in a WDM (e.g., DWDM) wavelength multiplexed channeling environment. The technology employs pre-compensation of chromatic error dispersion such for each of most, if... Agent: Workman Nydegger 1000 Eagle Gate Tower

20090123154 - Detecting presence of rogue onu: A system, method, and computer readable medium comprising instructions for rogue Optical Network Unit (ONU) detection by analyzing the frequency content are provided. Once an optical signal is received from an optical network unit, the transition detection unit converts the optical signal to an electrical data signal. The transition detection... Agent: Alcatel Lucent Intellectual Property & Standards

20090123155 - Data processing network having an optical network interface: An optical data processing network having an optical network interface is disclosed. The optical data processing network includes a first multi-processor system and a second multi-processor system. The first multi-processor system includes a first set of processors and a first set of optical network interfaces electrically coupled to the first... Agent: Dillon & Yudell LLP

20090123156 - Method and apparatus for receiving visible light signal in a visible light communication system: A visible light receiver and method for a visible light communication system. A PD array converts a received optical signal to an electrical signal, a position controller outputs a control signal to adjust the position of the PD array according to values of signals output from PDs of the PD... Agent: Cha & Reiter, LLC

20090123157 - Printed circuit board assembly carrier for an optical electrical device: A printed circuit board assembly (PCBA) carrier for enclosing an optical transceiver PCBA. The PCBA carrier includes a base portion including one or more first connection members, the base portion being configured to receive an optical transceiver PCBA and a top portion including one or more second connection members configured... Agent: Workman Nydegger 1000 Eagle Gate Tower

20090123158 - Light detection and ranging system: A light detection and ranging system includes a mirror unit rotating around a scan axis. The mirror unit includes a receiving portion and a transmitting portion offset by an angle about the scan axis relative to a surface plane of the receiving portion. Respective centroids of the receiving and transmitting... Agent: Calfee Halter & Griswold, LLP

20090123160 - Bit synchronization circuit with phase tracking function: A bit synchronization circuit comprising an initial phase determining unit for rapidly determining, during a period of receiving a preamble of burst data, a clock with a phase synchronized with received burst data from among multi-phase clocks having the same frequency as an internal reference clock and a phase tracking... Agent: Mcdermott Will & Emery LLP

20090123159 - System and method for data synchronization in passive optical networks: System and method for data synchronization in Passive Optical Networks. 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... Agent: Townsend And Townsend And Crew, LLP

20090123161 - Led system for illumination and data transmission: A LED system (100) for illumination and data transmission employs a LED driver (110), an electronic switch (130), and an illumination unit (150). In a first illumination state, illumination unit (150) receives LED current(s) from LED driver (110) to emit a first light output. In a second illumination state, the... Agent: Philips Intellectual Property And Standards

20090123162 - Controller for optical transmission device: A controller supplies a driving signal to an optical modulator for modulating light from a light source in accordance with the driving signal, a low frequency signal being superposed on the driving signal. A bias unit monitors a low frequency component of the modulated light and controls bias of the... Agent: Staas & Halsey LLP

20090123163 - Method of producing a highly permeable stable rf wavefront suitable as a data carrier: A method for generating a highly permeable stable broadband wavefront includes generating a modulated photon wave associated with a modulated data signal, the modulated photon wave comprising plural energized particles, directing the modulated photon wave to an incident surface of a charge transformer and transforming the plural energized particles within... Agent: Buchanan, Ingersoll & Rooney PC

20090123164 - Wave-division multiplexing telecommunications system and method: A fiber optic data transmission system includes an optical fiber and a data transmitter having a first laser having a first wavelength, a first phase modulator for phase modulating light from the first laser as a function of a first data input stream so as to create a first phase-modulated... Agent: Davidson, Davidson & Kappel, LLC

20090123165 - Dispersion compensating apparatus: A dispersion compensating apparatus compensates dispersion of an optical signal using reflection-type etalons. Each of the etalons reflects the optical signal and at least one etalon has, with respect to a group delay characteristic, a wavelength cycle and a finesse that are larger than those of the other etalons. Power... Agent: Staas & Halsey LLP

20090116833 - Optical wavelength multiplexed transmission apparatus: Each network device holds as a database parameters relating to the size of a factor of signal degradation of the device, and relays the parameters according to a path through which a signal passes. When each network device receives a relayed parameter, it accumulates the parameter of the device to... Agent: Staas & Halsey LLP

20090116834 - Optical transmission apparatus and restart control method: An apparatus comprises an optical level controller for autonomously controlling an optical device such that an optical level of the supplied optical signal becomes an objective level, and a controlled variable storer for storing a controlled variable in storage if a restart is required, the optical level controller providing the... Agent: Staas & Halsey LLP

20090116835 - Wavelength selective switch: A wavelength selective switch is provided. The wavelength selective switch according to the present invention comprises: an optical demultiplexer for separating an incident light with a plurality of wavelengths multiplexed into a plurality of wavelength lights and outputting the separated wavelength lights; an optical amplifier for selectively amplifying or absorbing... Agent: Rabin & Berdo, PC

20090116836 - Encoding for information needed for routing and wavelength assignment in wavelength switched optical networks: A network component comprising at least one control plane controller configured to implement a method comprising transmitting a message to at least one adjacent control plane controller, wherein the message comprises a Type-Length-Value (TLV) indicating Routing and Wavelength Assignment (RWA) information. Included is a method comprising communicating a message comprising... Agent: Conley Rose, P.C.

20090116837 - Method and system for controlling optical networks: An optical control system is described which is capable of maintaining and optimizing a fiber-optic transport system within it's domain of control while interacting with other optical systems which are controlled independently. This allows the optical system to be incorporated as a building block into a larger optical network in... Agent: Borden Ladner Gervais LLP Anne Kinsman

20090116838 - Bi-directional optical module with a polarization independent optical isolator: The present invention provides a bi-directional optical module with an optical isolator to prevent stray light from entering the laser diode (LD). The module includes a distributed feedback LD (DFB-LD), a photodiode (PD), a wavelength division multiplexed (WDM) filter, and a polarization independent isolator placed between the WDM filter and... Agent: Venable LLP

20090116839 - Optical transmission system and signal speed converting apparatus: A signal speed converting apparatus to be connected to a WDM transmission end office, comprising a first interface connected to a first optical line group, a plurality of second interfaces connected to a second optical line group, and a speed converter. The first interface has a first framer for terminating... Agent: Antonelli, Terry, Stout & Kraus, LLP

20090116841 - Systems and methods for adaptive gain control to compensate osnr penalty caused by side-lobe of mems-based reconfigurable optical add-drop multiplexers: The present invention provides systems and methods to adaptively control amplifier target power to maintain signal launching power as per design in networks with wavelength selective switch (WSS)-based reconfigurable optical add-drop multiplexers (ROADMs) using micro-electromechanical system (MEMS). Accordingly, signal OSNR does not collapse faster for WSS-based ROADMs than other similar... Agent: Clements Bernard PLLC

20090116842 - Transient control solution for optical networks: An optically amplified wavelength division multiplexing network has the functionality to add/drop channels at the optical add/drop multiplexing (OADM) nodes. The OADM node includes a receiver amplifier, an OADM module, and a transmitter amplifier. Once the OADM node detects a loss of signal (LOS) due to a fiber cut or... Agent: At&t Legal Department - Hb Patent Docketing

20090116840 - Wavelength division multiplex (wdm) optical demultiplexer: An optical demultiplexer (13, 30) for wavelength division multiplex WDM optical radiation comprising a plurality of wavelength channels (Ch1 . . . Ch16) spaced over a wavelength spectrum said demultiplexer being for separating the WDM radiation into individual wavelength channels is described. The demultiplexer comprises a first demultiplexer (12) for... Agent: Coats & Bennett, PLLC

20090116843 - Device for transmitting and receiving data and corresponding operating method: A passive device includes an optical-to-electrical converter unit, an electrical-to-optical converter unit, an antenna and a polymer modulator.... Agent: Staas & Halsey LLP

20090116844 - Electrical-dispersion compensating apparatus, optical receiving apparatus, and optical receiving method: An optical receiving apparatus branches an optical signal, photo-electric-converts the branched signals, and compensates dispersion in each of the converted electrical signals. Electrical-dispersion compensators respectively compensate the dispersion in the electrical signals using a transversal filter having plural taps. A dispersion control unit controls the dispersion compensation amount for each... Agent: Staas & Halsey LLP

20090116846 - Protocols for out-of-band communication: Methods for managing an optical network through out-of-band communication between optical transceiver modules in a heterogeneous network fabric are disclosed. The disclosed methods include methods for performing fabric discovery, communicating error messages, detecting intrusion. Methods are also disclosed for communicating between transceivers of differing protocol versions and memory capacity.... Agent: Workman Nydegger 1000 Eagle Gate Tower

20090116845 - Tetintelligent optical transceiver capable of optical-layer management: An integrated optical transceiver includes an optical receiver that receives a first optical signal that comprises input user data and a first modulation signal. The first modulation signal includes first management information. The optical receiver can output a first electrical signal comprising the first modulation signal and to output a... Agent: Xin Wen

20090116847 - Optical transceiver with in-band management channel: A supervisory signal is superimposed onto a high-speed data stream so that the number of optical transceivers needed by an optical network is reduced. The supervisory signal is superimposed onto the high-speed data stream as an in-band modulation of the data stream. To improve signal-to-noise ratio of the in-band supervisory... Agent: Patterson & Sheridan, LLP

20090116848 - Optical communication system and method using manchester encoded signal remodulation: An optical communication system and method using Manchester encoded signal remodulation are provided. The optical communication system includes a transmitter generating and transmitting a Manchester encoded optical signal including a first data stream, and a receiver receiving an optical signal obtained by dividing power of the Manchester encoded optical signal... Agent: Lahive & Cockfield, LLP Floor 30, Suite 3000

20090116849 - Dqpsk modulation apparatus and dqpsk modulation method: An optical transmitting apparatus includes a branching unit that branches light output from a light source into light beams, a phase control unit and an ABC circuit that control the phase of one of the light beams to π/2, a data processing unit that performs phase modulation on each of... Agent: Staas & Halsey LLP

20090116850 - Resonant quantum well modulator driver: A drive circuit and method of controlling a quantum well modulator are disclosed. The drive circuit can be disposed in an optical transceiver having a quantum well modulator configured to retro-modulate an incoming optical signal. The drive circuit can include separate modulating and bias voltage sources. A level of the... Agent: Townsend And Townsend And Crew, LLP

20090116851 - Optical receiver having bandwidth control for intersymbol interference compensation: Apparatus and techniques for receiving and processing an optical signal. In one implementation, an optical receiver is provided to include a delay line interferometer, an etalon, and a data estimator for estimating the data carried on a differentially modulated optical input signal. The delay line interferometer receives the input signal... Agent: Fish & Richardson, PC

20090116852 - Optical receiver implemented with dual electronic dispersion compensators: An optical receiver implemented with two electronic dispersion compensators (EDC) is disclosed. The optical receiver selects one of the EDC in an ordinary operation. Once there shaped signal compensated by the selected EDC is degraded due to irregular conditions of the optical transmission line, the optical transmitter and so on,... Agent: Venable LLP