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Optical communications December patent applications/inventions, industry category 12/09

20090324214 - Method, apparatus and system for handling fiber line fault: A method for handling a fiber line fault is provided. The method includes: loading, by a station, an indication signal carrying alarm suppression information onto an optical signal to be output to a downstream fiber of the station upon detection of a fault on upstream fiber line; keeping in a... Agent: Harness, Dickey & Pierce, P.L.C

20090324215 - Active/standby switchover method and device of asynchronous backplane in transport network: An active/standby switchover device and an active/standby switchover method of an asynchronous backplane in a transport network are provided. A local oscillator clock is adopted to obtain a clock of a working path, so as to replace the clock of the working path tracked in a phase-locked loop mode. An... Agent: Leydig, Voit & Mayer, Ltd (for Huawei Technologies Co., Ltd)

20090324217 - Method and apparatus for remote communication using the interpretation of thermoluminescence or photoluminescence signals: A method for remote communication using the interpretation of thermoluminescence or photoluminescence signals uses a property of photoluminescence or of thermoluminescence when it is caused by entangled trapped electrons. In this case, stimulation of deexcitation of trapped electrons by heat or radiation occurs when the deexcitation thermal energy is approximately... Agent: E-quantic Communications

20090324216 - Optical activation of one or more communication units in a survey system: To control activation of one or more communication units in a survey system that performs surveying of a subterranean structure, optical activity on at least one optical link connected to at least one communication unit that is part of a survey system is detected. In response to determining that the... Agent: Westerngeco L.L.C. Jeffrey E. Griffin

20090324218 - Optical signal detection method, and light receiving apparatus using the same: A signal detection method used in an optical receiver apparatus detects the variation of an optical input level from the presence or absence of a clock signal and appropriately controls a dispersion compensator, thereby enabling the presence or absence of an input signal to be correctly determined. The signal detection... Agent: Staas & Halsey LLP

20090324219 - Apparatus and method for improving the tolerance of tone-based optical channel monitoring to stimulated raman scattering: For wavelength division multiplexing (WDM) communications, apparatus and methods are provided for performing tone-based optical channel monitoring that is less sensitive to stimulated Raman scattering (SRS). In tone-based optical channel monitoring, in which WDM channels are modulated with one or more tones, detecting and measuring the tone power is commonly... Agent: Brosemer, Kolefas & Associates, LLC (alu)

20090324220 - Communication network with node bypassed co-routed multi-channel traffic: Embodiments of the present invention route a wavelength division multiplexed signal across multiple communication paths using skew characteristics of at least some of the communication paths. The network is a wavelength division multiplexed optical transport network. The plurality of communication paths involves different signal and path attributes such as a... Agent: Infinera Corporation Ross Carothers

20090324221 - Scalable load-balanced interconnect switch based on an arrayed waveguide grating: According to one embodiment, an interconnect switch has an arrayed waveguide grating (AWG) having N input ports and N output ports. The AWG is characterized by two or more diffraction orders and is adapted to route optical signals from the input ports to the output ports. In a fully deployed... Agent: Mendelsohn, Drucker, & Associates, P.C.

20090324222 - Link diversity and load balancing across digital and optical express-thru nodes: The present invention provides a system, apparatus and method to compute a route through a network having both digital nodes and optical express-thru nodes. According to various embodiments of the invention, a network topology is generated in which both digital nodes, optical express-thru nodes, and optical nodes are identified, and... Agent: Infinera Corporation Ross Carothers

20090324223 - System, method and apparatus for channel estimation with dual polarization training symbols for coherent optical ofdm: System, apparatus and method of optical communication are provided for performing channel estimation for an optical OFDM system by utilizing correlated dual-polarization training symbols (CDPTS) to offer high system tolerance to fiber nonlinear effects such as cross-phase modulation (XPM) among wavelength-division multiplexed (WDM) channels. An exemplary method includes receiving a... Agent: Docket Administrator (room 2f-192) Lucent Technologies, Inc.

20090324224 - System, method and apparatus to suppress inter-channel nonlinearities in wdm systems with coherent detection: For optical communications, apparatus and methods are provided for performing dispersion compensation management that suppresses intra-channel nonlinearities, inter-channel cross-phase modulation (XPM) and/or nonlinear polarization scattering. In optical communication, in which wavelength division multiplexed (WDM) channels are modulated, detecting and measuring channels with coherent detection is complicated due to impairments caused... Agent: Lucent Technologies, Inc. Docket Administrator (room 2f-192)

20090324225 - Method for maintaining the compatibility of legacy of receivers, optical distributing network structure, and parts thereof including a method for using such part: The invention relates to a method for maintaining the compatibility of legacy receivers in network termination units of an optical distributing network structure, especially in a passive optical network, when in the distributing network structure advanced receivers with a multiple of the data rate of the legacy receivers shall be... Agent: Sughrue Mion, PLLC

20090324226 - System, method and apparatus for channel estimation based on intra-symbol frequency domain averaging for coherent optical ofdm: System, apparatus and method of optical communication are provided for performing efficient channel estimation for a CO-OFDM link utilizing an intra-symbol frequency-domain averaging (ISFA) to compensate for transmission impairments. An exemplary method includes receiving a pair of training symbols in an optical orthogonal frequency-division multiplexed (OFDM) signal, performing channel estimation... Agent: Docket Administrator (room 2f-192) Lucent Technologies, Inc.

20090324227 - Multi-channel optical transport network training signal: Systems and methods are provided for multi-channel ITU G.709 optical transport network (OTN) communications The transmission method accepts an ITU G.709 OTN frame including an OTU overhead (OH) section and an ODU section. A forward error correction (FEC) parity section with a training signal is appended to the ITU G.709... Agent: Gerald W. Maliszewski

20090324228 - Ont test unit: An Optical Network Terminal (ONT) simulator is provided. The ONT simulator includes one or more partially functional ONTs coupled to an Optical Line Termination (OLT) and an ONT/Optical network termination Management and Control Interface (ONT/OMCI) simulation utility. The ONTs receive test network traffic from the OLT and forward any OMCI... Agent: Fitzpatrick Cella Harper & Scinto

20090324229 - Optical transmission apparatus and control method therefor: An optical transmission apparatus comprising a first detector for detecting the power of the supervisory signal light separated from received wavelength-division multiplexed signal lights; a second detector for detecting the power of the wavelength-division multiplexed signal lights after the separation of the supervisory signal light; a gain-controlled type optical amplifier... Agent: Mcdermott Will & Emery LLP

20090324230 - Optical transmission system using four-wave mixing: Provided is an optical transmission system using four-wave mixing which is configured in a WDM-PON topology where a signal light between an optical line terminal 11 and each of optical network units 13-1, . . . , 13-N is multi/demultiplexed at a WDM 12. The optical line terminal 11 transmits... Agent: Westerman, Hattori, Daniels & Adrian, LLP

20090324231 - Transmission line monitoring system: In a transmission path monitoring system, a first add section adds a first add signal to a first wavelength division multiplexing signal. A first drop section separates a first drop signal from the first wavelength division multiplexing signal. A first loopback section transfers a monitor signal on a first drop... Agent: Mr. Jackson Chen

20090324232 - Method and system for announcing traffic engineering parameters of composite transport groups: An approach is provided for announcing aggregate characteristics of a composite transport group (CTG) for traffic engineering. Information specifying characteristics of a plurality of component links of the CTG is received. An aggregate characteristic of the CTG is determined based the information. The aggregate characteristic is announced to a label... Agent: Verizon Patent Management Group

20090324233 - Fiber-optic long-haul transmission system: An ultra-long fiber-optic transmission system is configured in accordance with the current telecom standards and particularly advantageous for transmission data at a long distance which may exceed 400 km between adjacent nodes. The disclosed system has at least one intermediary amplifying node provided with a supervisory optical channel (SOC) which... Agent: Ipg Photonics Corporation

20090324234 - Optical transmission system using raman optical amplification: Provided is an optical transmission system using Raman optical amplification, which is configured in a WDM-PON topology where a signal light between an optical line terminal 11 and each of optical network units 13-1, . . . , 13-N is multi/demultiplexed at a WDM 12. The optical line terminal 11... Agent: Westerman, Hattori, Daniels & Adrian, LLP

20090324235 - Multiple movable barrier operator system and method: A first moveable barrier operator is actuated to move a first moveable barrier and a light beam is encoded with operational information regarding the first movable barrier operator. The encoded light beam is transmitted from an emitter associated with the first moveable barrier operator to a first detector associated with... Agent: Fitch Even Tabin & Flannery

20090324236 - Method and system for laser based communication: Method and system for determining a point-ahead angle from a first spacecraft to a second spacecraft, each spacecraft having a laser communication (“lasercom”) terminal is provided If ephemeris data regarding the second spacecraft is unavailable to the first spacecraft while the second spacecraft is mobile, (a) obtaining attitude information regarding... Agent: Klein, O'neill & Singh, LLP

20090324237 - Pluggable optical network unit capable of status indication: A pluggable optical network unit includes a transceiver assembly configured to produce a first electrical signal in response to a first optical signal comprising reception signal data and to emit a second optical signal comprising transmission signal data in response to a second electrical signal. A data processing unit can... Agent: Xin Wen

20090324238 - Single-fiber bidirectional optical transmitter/receiver: A single-fiber bidirectional optical transmitter/receiver includes a single-fiber bidirectional optical transmission/reception device. A circuit board has a signal processing circuit and a drive circuit configured to drive the single-fiber bidirectional optical transmission/reception device. A main housing accommodates the single-fiber bidirectional optical transmission/reception device and the circuit board. A ground part... Agent: Staas & Halsey LLP

20090324239 - Optical integrated circuit apparatus: Optical waveguides and optical transmission/reception units are placed on one principal plane of a semiconductor substrate. A light source is placed on one end surface of the semiconductor substrate and guides generated light to the optical waveguides. In the optical transmission/reception units, each of optical resonant members optically resonates with... Agent: Foley & Lardner LLP

20090324241 - Chio to chip optic alleys and method: A data link includes an ASIC. The data link includes a heat insulation layer in contact with the ASIC. The data link includes an optical transducer layer having a plurality of transducers, with each transducer of the plurality of transducers in communication with the ASIC. Each transducer converting optical signals... Agent: Ansel M. Schwartz Attorney At Law

20090324240 - Transmission line optimization method in optical communication system: In an optical communication system in which an optical signal is sequentially transferred through a plurality of transmission sections of an entire transmission line between a most upstream node and a most downstream node, wherein the entire transmission line is sectioned by at least one intermediate node into the transmission... Agent: Jackson Chen Nec Corporation Of America

20090324242 - 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.... Agent: Oblon, Spivak, Mcclelland Maier & Neustadt, L.L.P.

20090324244 - Photometric device: A photometric device with a wide dynamic range. The photometric device includes a constant current generation circuit, a fixed clock signal generation circuit which generates a fixed clock signal having a fixed frequency, a photoelectric conversion element, a variable clock signal generation circuit and a digital signal generation circuit. The... Agent: Nixon Peabody, LLP

20090324243 - Scalable load-balanced interconnect switch based on an optical switch fabric having a bank of wavelength-selective switches: According to one embodiment, an interconnect switch has an optical switch fabric (OSF) having N input ports and N output ports. The OSF has a bank of optically interconnected wavelength-selective switches and is adapted to route optical signals from the input ports to the output ports. In a fully deployed... Agent: Mendelsohn, Drucker, & Associates, P.C.

20090324245 - Optical triggered self-timed clock generation: A self-timed clock circuit and method of generating a self-timed clock circuit. The circuit includes means for charging a circuit node in response to an external reset signal; means for discharging the circuit node in response to a trigger signal generated by a photodiode; means for generating a first signal... Agent: Schmeiser, Olsen & Watts

20090324246 - Method of limiting the non-linear phase noise of a phase-modulated optical signal of constant amplitude, and an associated device: A non-linear phase noise limiter device limits the non-linear phase noise that affects a phase-modulated input optical signal of constant mean amplitude conveyed over a transmission line. The device is placed at a zero dispersion point of the transmission line, and it is suitable for suppressing amplitude fluctuations about a... Agent: Westman Champlin & Kelly, P.A.

20090324247 - Optical modulator: The present invention relates to an optical modulator that generates quaternary amplitude modulated light without inter-symbol-interference by splitting input light into three optical paths, generating a continuous wave signal in a first optical path, generating binary phase modulated lights using a single drive MZ type optical phase modulator in second... Agent: Antonelli, Terry, Stout & Kraus, LLP

20090324248 - Illumination light receiver and illumination light communications system: An illumination light receiver includes: a wavelength separation mechanism separating visible light containing optical signal data distributed among wavelengths corresponding to three primary colors into the wavelengths corresponding to the three primary colors; a dispersion restraining mechanism restraining dispersion of light outputted from the wavelength separation mechanism; and a light... Agent: Birch Stewart Kolasch & Birch

20090324249 - High loss loop back for long repeater span: Various high loss loop back (HLLB) repeater architectures are disclosed that enable selectively monitoring (e.g., measuring, analyzing, etc) of Rayleigh signals from both inbound and outbound directions of an optical communication system. In one such embodiment, first and second optical test signal frequencies (or ranges) are used, in conjunction with... Agent: Tcm/gtpp

20090324250 - Wireless transmitters: A wireless transmitter includes an optical modulator, an optical power splitter, a plurality of electrical drivers, and a plurality of antennas. The optical power splitter has a plurality of optical outputs and has an optical input connected to receive a modulated optical carrier from the optical modulator. Each driver is... Agent: Alcatel-lucent Usa Inc. Docket Administrator - Room 2f-192

20090324252 - Optical transmitter: An optical transmitter includes a light source that outputs light superposed with a pilot signal having a predetermined frequency; an optical modulating unit that modulates the light from the light source according to an input electric signal; a detecting unit that detects a high-output-side maximum value of signal light output... Agent: Staas & Halsey LLP

20090324251 - Tunable radio frequency and microwave photonic filters: RF and microwave devices and techniques are disclosed for processing RF and microwave signals by using (1) photonic or optical components and (2) RF and microwave components. In some implementations, a part of the processing is performed in the RF and microwave domain such as applying a microwave or RF... Agent: Fish & Richardson, PC

20090324253 - Optical modulator for higher-order modulation: According to one embodiment of the invention, a 16-QAM optical modulator has a Mach-Zehnder modulator (MZM) coupled to a drive circuit that drives the MZM based on two electrical binary signals. The output of the MZM corresponds to an intermediary constellation consisting of four constellation points arranged on a straight... Agent: Mendelsohn, Drucker, & Associates, P.C.

20090324254 - Optical transmission apparatus and method: In an optical transmission apparatus, a light-emitting laser varies its output wavelength when applied with a wavelength control signal for switching wavelengths. A wavelength controller outputs the wavelength control signal, and a filter unit subjects the wavelength control signal to a filtering process to remove high-frequency noise superimposed on the... Agent: Staas & Halsey LLP

20090324255 - Light transmitting apparatus and method for controlling the same: A light transmitting apparatus of the invention includes: a light transmitting section having a light source and an EA modulator, and a control section that controls the optical output power of the light transmitting section to be constant, based on a monitor value of EA photoelectric current. The control section... Agent: Staas & Halsey LLP

20090324257 - Optical transmission apparatus, optical transmission system and communication method therein: An optical transmitting station changes a power level of control signal light having a first frequency at a second frequency lower than the first frequency, and transmits the control signal light whose power level has been changed to an optical receiving station through an optical transmission line. The optical receiving... Agent: Staas & Halsey LLP

20090324256 - Optical transmitter: In an optical transmitter, a laser emits light. A laser driving controller controls driving of the laser by superimposing modulation signals on laser driving signals to generate laser driving superimposed signals and by applying the laser driving superimposed signals to the laser to cause wavelength fluctuations in laser output light... Agent: Staas & Halsey LLP

20090317073 - Systems and methods for ethernet extension and demarcation: The present invention provides Ethernet extension and demarcation functionality through a Multi-Source Agreement (MSA) pluggable transceiver in a customer or remote device. The pluggable transceiver is configured to frame an Ethernet client signal and to provide OAM&P functionality, such as with G.709 framing. The pluggable transceiver operates within existing multi-source... Agent: Clements Bernard PLLC

20090317074 - Method and apparatus for confirming optical fibers connection in optical connector: Provided is a method for confirming optical fibers connection in a connection part in an optical connector, including: allowing light to pass through a first optical fiber and allowing cladding mode light to disappear; and detecting a difference in light intensity in the connection part between before and after the... Agent: Sughrue Mion, PLLC

20090317075 - Optical balanced receiver and iq receiver with balanced compensation: An optical balanced receiver including an optical coupler for combining input optical information signal and optical reference signal and outputting two optical interfering signals whose phases are opposite to each other, two photodetectors for receiving the two optical interfering signals and outputting detection signals as electrical signals having the amplitudes... Agent: Antonelli, Terry, Stout & Kraus, LLP

20090317076 - Wdm transmission apparatus: A WDM transmission apparatus to receive or relay WDM light in a WDM transmission system, includes a measuring unit configured to measure an optical level of each channel transmitted by the WDM light; an adjusting unit configured to adjust a resolution of the measuring unit; and a processing unit configured... Agent: Staas & Halsey LLP

20090317077 - Method for determining the optical signal-to-noise ratio and receiver device for an optical transmission system: An optical noise signal is added to an optical data signal on the receiver side, and a signal quality of the data signal is determined. The magnitude of the added noise signal is varied, and a function of the signal quality of the data signal is determined in dependence on... Agent: Lerner Greenberg Stemer LLP

20090317079 - Dispersion determining apparatus and automatic dispersion compensating system using the same: A dispersion determining apparatus comprises a received waveform monitoring part (1) and a dispersion amount determining part (4). The received waveform monitoring part (1) has a waveform monitoring circuit (2) that samples data from the received waveform of a received signal having propagated along a transmission path, and a histogram... Agent: Mr. Jackson Chen

20090317078 - Optical transmission device and optical transmission method: The signal quality of ultra high-speed signals such as 40 Gbit/s and 100 Gbit/s are significantly degraded due to wavelength dispersion and nonlinear effects in an optical fiber. Thus, there is provided a transponder unit in which a light source is polarization multiplexed in a direction mutually orthogonal to a... Agent: Mattingly & Malur, P.C.

20090317080 - Method and arrangements for improving signal quality: The invention relates to a bandpass filter (OFI) which is mounted downstream of an optical amplifier (OV) and allows noise to be largely reduced. In order for said bandpass filter to be able to optimally receive burst signals (BS1, BS2, . . . , BSN) transmitted by several user devices... Agent: Dickinson Wright, PLLC

20090317081 - Optical digital transmission for multiple beam cross connection, routing and switching: The invention concerns an optical digital transmitting device for cross connecting, routing and switching at temporal, spatial and frequency level a plurality of electromagnetic beams. Said device uses a plurality of laser type or other low/medium power type magnetic sources, coupled to a plurality of matrix optical heads and specific... Agent: Jerome D. Jackson (jackson Patent Law Office)

20090317082 - Passive optical network system, optical network unit, and optical line terminal: An optical line terminal (OLT), an optical network unit (ONT) and a passive optical network (PON) system are provided. A user of the ONU or a terminal connected with the ONU can accurately recognize the amount of a bandwidth allocated to the ONU without estimating the communication bandwidth. The OLT... Agent: Antonelli, Terry, Stout & Kraus, LLP

20090317083 - Optical remote node device and support equipment for constructing and extending fiber-optic access networks: Optical remote node (NR) device which is situated at a remote point in a fibre-optic metropolitan or access network, carries out the functions of connecting, and transmitting information between, various sections of the network in a passive manner without a power supply using various optical components which extract the necessary... Agent: Berenbaum Weinshienk PC

20090317084 - Passive optical network system and optical signal receiving method thereof: A passive optical network system includes: a plurality of optical signal splitter receiving optical signals from a plurality of optical network units (ONUs) to provide a plurality of upstream optical signals having different wavelengths; a hybrid optical filter multiplexing the plurality of upstream optical signals in a wavelength division multiplexing... Agent: Ampacc Law Group

20090317085 - Optical module and dispersion compensator: In an optical module, a lens collects input light to generate a collected beam. A VIPA plate includes a reflective surface for highly reflecting light and a transmissive surface on which a reflection film having a lower reflectivity than the reflective surface is deposited. The VIPA plate causes multiple reflection... Agent: Staas & Halsey LLP

20090317087 - Configurable control for network device operation: A network device can encounter operating conditions that have potential to affect upstream communications adversely for another network device, as well as for the upstream communications or hardware of the network device itself. A network device according to an example embodiment of the present invention is configured to determine when... Agent: Hamilton, Brook, Smith & Reynolds, P.C.

20090317088 - Optical space transfer apparatus using image sensor: A transmission device includes a first light emission unit having a light source for emitting one optical signal. A reception unit includes an X-Y address system image sensor, having a pixel region including a plurality of pixels, for receiving the optical signal by the pixel region; a classification unit for... Agent: Wenderoth, Lind & Ponack L.L.P.

20090317086 - Optical transceiver module and method of controlling optical transceiver module: An optical transceiver module for transmitting and receiving an optical signal with a plurality of channels includes timing generator for sequentially generating timing instructions defining different start-up time points, and powering controller for effecting a control such that power supply to at least a portion of circuit components associated with... Agent: Antonelli, Terry, Stout & Kraus, LLP

20090317089 - Distributable quantum relay architecture: A distributed quantum relay architecture is disclosed. In one embodiment of this architecture, time and wavelength division multiplexing are used to enable a laser pump pulse, already used to create an initial entangled photon pair, to be distributed to a remote relay site, on the same optical fiber as a... Agent: Telcordia Technologies, Inc.

20090317090 - Multichannel optical transport network skew control: A system and method are provided for controlling time delay in a multichannel optical transport network transmission device. The method accepts a pair of 2n-phase shift keying (2nPSK) modulated signals via Ix and Qx electrical signal paths, where n>1, and a pair of 2p-PSK modulated signals via Iy and Qy... Agent: Gerald W. Maliszewski

20090317091 - Laser transmitting at automatically varying wavelengths, network interface unit and system including the laser, and method of automatically varying the wavelength of a laser: A laser unit, usable in a network interface unit (NIU), that includes a laser adapted to generate an optical signal having a wavelength, a temperature control system for establishing a temperature of the laser and a controller functionally connected to the temperature control system for setting the temperature, the controller... Agent: Scott L. Lowe Muncy, Geissler, Olds & Lowe, PLLC

20090317092 - Optical receiving apparatus and digital receiving circuit: An optical receiving apparatus includes a combining unit that combines signal light and reference light; a optoelectric converting unit that converts, into electrical signals, two or more optical signals that enable reconstruction of a complex electric field signal of the signal light obtained by the combining unit; and a sampling... Agent: Staas & Halsey LLP

20090317093 - Dpsk optical receiver: A DPSK optical receiver includes a DPSK demodulation circuit, an optical bandpass filter, a first photodetector, and a first control circuit. The DPSK demodulation circuit demodulates a DPSK optical signal and outputs the DPSK demodulated optical signal. The optical bandpass filter extracts a demodulated optical signal near the center wavelength... Agent: Mr. Jackson Chen

20090317094 - Maximum likelihood sequence estimation in optical fibre communication systems: A method of and a receiver(20) for detection of a received signal in an optical fibre communication system using Viterbi algorithm methodology in which branch metrics are obtained using approximated expressions to calculate the branch metrics. Use of the expressions results in practically the same performance as a receiver based... Agent: Coats & Bennett, PLLC

20090310960 - method for mesh optical network service restoration: This invention discloses a method for mesh restoration, which includes the steps of: a) reserving channel resource for restoration path in the link by which the path passes and assigning discriminator for each channel, and determining the associated signaling channels for transporting the discriminator; b) when detecting the work path... Agent: Ladas & Parry

20090310961 - Method and apparatus for calibrating burst mode laser transmitters: A method is provided to calibrate a monitor photodiode that measures the optical output power generated by an optoelectronic transceiver module that includes a burst mode laser diode. The method includes disabling the power control loop that controls an average optical output power generated by the laser diode during a... Agent: Motorola, Inc. Law Department

20090310962 - Service based power and battery backup selection in a multiple dwelling unit: Heavy users of a Multi-Dwelling Unit Optical Network Terminal (MDU ONT) continuing to use services, such as telephone, data and video, when the MDU ONT is operating from backup power unfairly use the power available from the battery backup power supply. In other words, a heavy user uses more than... Agent: Hamilton, Brook, Smith & Reynolds, P.C.

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... Agent: Snell & Wilmer LLP (oc)

20090310964 - Optical communication system and optical line terminating apparatus: There is provided an abnormal light cut-off system in which even when a high power light is inputted from an optical fiber connected to a user side apparatus by a malicious user or an accident, a trouble rate is low, the abnormal light is cut off at high sensitivity, and... Agent: Juan Carlos A. Marquez C/o Stites & Harbison PLLC

20090310966 - Direct detection receiver using cross-polarization interferometer for polmux-ask system: A differential delay detection system and method includes an optical splitter to split an incoming optical signal between a first path and a second path. The first path includes a cross-polarization interferometer configured to separately generate polarization independent outputs using split paths and to generate cross-polarization interference outputs, balanced photodetectors... Agent: Nec Laboratories America, Inc.

20090310965 - Optical transmission system and device for receiving an optical signal: The invention concerns a device (100) for receiving an optical signal comprising at least one optical signal of angular frequency ω0 modulated by an electrical signal of angular frequency Ω whose phase φ1 varies according to the value of at least data bit to be transmitted. The reception device (100)... Agent: Briggs And Morgan P.A.

20090310967 - Method and apparatus for transmitting multiple channels in a wavelength division multiplexed (wdm) optical communication system with reduced raman crosstalk and nonlinear distortions: An improved method and apparatus is provided for transmitting a WDM optical signal. The method begins by modulating optical channels that are each located at a different wavelength from one another with (1) a respective one of a plurality of information-bearing electrical signals that all embody the same broadcast information;... Agent: Motorola, Inc. Law Department

20090310968 - Multiple wavelength light source, and generation method for multiple wavelength light: A multiple wavelength light source of the present invention is a multiple wavelength light source having an optical comb generator for obtaining an input light and a group of lights shifted from the input light by predetermined frequencies; and an optical adjusting portion adjusting lights to be inputted to the... Agent: Westerman, Hattori, Daniels & Adrian, LLP

20090310969 - Optical transmitting apparatus and optical multiplexing unit: Even during a protection period in which a state transition is not caused from an ALC state to an ALD state, when an output light level that is inputted is below a threshold for ALC transition read from a memory, a processor causes a transition by switching an internal state... Agent: Staas & Halsey LLP

20090310970 - Network timing: The subject matter disclosed herein relates to synchronizing network timing. In one particular example, network timing may be synchronized using reflected signals.... Agent: Applied Optoelectronics, Inc.

20090310971 - Visible light communication method and system: A time-sharing Visible Light Communication (VLC) system is provided. Two or more light sources transmit data received from one or more VLC terminals located in its service area to a communication control device, and transmits data received from the communication control device to the one or more VLC terminals. The... Agent: The Farrell Law Firm, LLP

20090310972 - Circuit card subassemblies for interconnection of electronic components: A communication system is provided. The communication system includes a serialized radio frequency transceiver module and at least one radio frequency module. The serialized radio frequency transceiver module includes a plurality of optical-module connectors, and a remote serialized radio frequency interface including a plurality of high speed connectors. Each of... Agent: Fogg & Powers LLC

20090310973 - Electroluminescent emission device for optical transmission in free space: The device is connected by its input terminals (1) to an a.c. energy distribution system. A mains filter (2) reduces the conducted electromagnetic disturbances produced by the power circuits comprising a rectifier (3), a power-factor-correction circuit (4), an auxiliary power supply (5) and a DC-to-DC converter (8). The output of... Agent: Mcdonnell Boehnen Hulbert & Berghoff LLP

20090310974 - Apparatus and method for detecting the position of media in a media path: An apparatus (100) and method (200) that detects the position of media (116) in a media path is disclosed. The apparatus may include a media transport (110) configured to transport media and an optical transmitter (140) coupled to the media transport, where the optical transmitter can be configured to transmit... Agent: Prass LLP

20090310975 - Adaptive dispersion compensation system and method for optical communication network: The present invention discloses an adaptive dispersion compensation system and a method used in optical communication network, comprising at least one performance detecting unit (20), for detecting the dispersion relevant performances; at least one control processing unit (30), for generating control information according to the detected information from the at... Agent: Christopher P. Maiorana, P.C.

20090310976 - Illuminative light communication system: An light source control unit controls the flashing of a light source and the light amount of a light source according to information to be transmitted. Thus, light, which is modulated according to the information to be transmitted, is emitted from the light source. The light emitted from the light... Agent: Rader Fishman & Grauer PLLC

20090310977 - Systems for deploying an optical network: A transmitter on an integrated circuit chip is disclosed that employs a laser, modulator, and a dispersion compensator module and a modulator for overcoming chromatic dispersion and polarization dependent loss effects. With the present invention, the dispersion compensator module is placed on a chip, either integrated or monolithic, for operation... Agent: Patterson & Sheridan, LLP

20090310978 - Complementary optical wiring system: A complementary optical wiring system has a transmitting circuit configured to combine a delayed signal obtained by delaying a digital electric input signal by a time shorter than a minimum pulse width of the digital electric input signal with the digital electric input signal to generate a first electric pulse... Agent: Oblon, Spivak, Mcclelland Maier & Neustadt, L.L.P.

20090310979 - Electronic circuit and communication system: An electronic circuit includes: a differential amplifier circuit into which a digital input signal and a reference signal are fed; a feedback circuit outputting an average of amplitude of the input signal; and a peak holding circuit outputting a signal held based on an output signal of the feedback circuit... Agent: Westerman, Hattori, Daniels & Adrian, LLP

20090304379 - Optical signal bit rate adjuster, an optical signal generator, an optical test device, an optical signal bit rate adjustment method, a program, and a recording medium: An optical signal bit rate adjustment device of the present invention includes a demultiplexing unit that demultiplexes light into first demultiplexed light and second demultiplexed light, a first optical path through which the first demultiplexed light passes, a second optical path through which the second demultiplexed light passes, a multiplexing... Agent: Greenblum & Bernstein, P.L.C

20090304380 - Quality of service in an optical network: A method and apparatus for implementing optical network quality using bit error rate and chromatic dispersion. According to one embodiment of the invention, a method includes the provision of quality of service in a wavelength division multiplexing optical network that supports a plurality of bit rates. As part of this... Agent: Blakely Sokoloff Taylor & Zafman LLP

20090304381 - System and method for configuration discovery in an optical network: A system and method for discovering configuration errors in an optical network is disclosed. The neighbors of each node are discovered. An information model of the optical network is formed, which may be used to determine configuration errors. In one embodiment, each node exchanges node identification messages with neighboring nodes... Agent: Merek, Blackmon & Voorhees, LLC

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... Agent: Greenblum & Bernstein, P.L.C

20090304383 - Optical network systems and methods for operating same: A system for transmitting data packets over a network. The system includes a plurality of first nodes, wherein each first node has a first transceiver configured to transmit a data packet at at least one of a plurality of first wavelengths and receive a data packet at an assigned first... Agent: Pepper Hamilton LLP

20090304386 - Compact virtual local area network mapper for the gigabit-passive optical network optical network management and control interface: An apparatus comprising a Virtual Local Area Network (VLAN) mapper associated with a plurality of interfaces and a plurality of ports corresponding to the interfaces, wherein the VLAN mapper is configured to direct a plurality of packets between the interfaces and the corresponding ports based on a VLAN mapping table.... Agent: Futurewei Technologies, Inc. C/o Conley Rose, P.C.

20090304384 - Intelligent pluggable transceiver stick capable of diagnostic monitoring and optical network management: An integrated optical transceiver includes an optical subassembly that produces a first electrical signal in response to a first optical signal comprising reception signal data and to emit a second optical signal comprising transmission signal data in response to a second electrical signal. A data processing unit can extract the... Agent: Xin Wen

20090304385 - Methods and apparatus for next generation access passive optical networks: Methods and apparatuses for controlling transmission of converged data packets and for media access through a single next generation access (NGA) passive optical network (PON) which can coexist with EPON and GPON based systems and can interoperate with a 10 GEPON. A converged data packet is transmitted between a first... Agent: Dr. Mark M. Friedman C/o Bill Polkinghorn - Discovery Dispatch

20090304387 - Optical data network for bilateral communication between a plurality of communication nodes: A fiber optic bidirectional communications network includes a plurality of decentralized communication nodes each including a receiver for receiving electromagnetic radiation at a wavelength λ2 and a transmitter for transmitting electromagnetic radiation at a wavelength λ1, at least one relay including a receiver operable to receive signals at λ2 and... Agent: Patents On Demand - G&h

20090304388 - Optical branching apparatus and passive optical network system: In the case where, in a WDM-PON system, a high-output optical signal or a pseudo signal for illegal access by a hostile user, or an optical signal with a wavelength which is not assigned from an OLT is input to an ONU-side optical fiber, the quality of communications for other... Agent: Antonelli, Terry, Stout & Kraus, LLP

20090304389 - Semiconductor apparatuses having optical connections between memory controller and memory module: Semiconductor apparatuses having optical connections between a memory controller and a memory module are provided. A semiconductor apparatus includes a memory controller, at least one socket configured to receive a memory module, and a first optical-electrical module. A second optical-electrical module is mounted in the socket and optically coupled to... Agent: Harness, Dickey & Pierce, P.L.C

20090304390 - Optical integrated circuit apparatus: Optical waveguides and optical transceivers are formed on one main surface of a semiconductor substrate. A light source is provided on one side surface of the semiconductor substrate, and emits light to the optical waveguides. In each of the optical transceivers, when a voltage is applied to a silicon layer,... Agent: Foley & Lardner LLP

20090304391 - Optical communications system having chromatic dispersion and polarization mode dispersion compensation: Described are an optical communications system and a method that allow for compensation of chromatic dispersion and polarization mode dispersion imparted to a communications signal propagating through an optical link. The system is based on a cost-effective optical transport architecture that accommodates baud rates exceeding 15 Gbaud and eliminates the... Agent: Guerin & Rodriguez, LLP

20090304392 - Reflective optical circulator: Provided is a reflective optical circulator capable of improving characteristics by preventing the occurrence of PDL and non-uniformity of insertion losses of reciprocating optical paths. The reflective optical circulator includes: an optical element unit having a first polarization separating element, a 45° non-reciprocal polarization plane rotating element, a phase element... Agent: Studebaker & Brackett PC

20090304393 - Super high speed optical frequency sweeping technology: It is an object to provide an optical frequency control device or the like which can quickly carry out control over a wide frequency range. The object is achieved by an optical frequency control device or the like comprised of an optical SSB modulator (2), a bias voltage source (3)... Agent: Osha Liang L.L.P.

20090304394 - Delay interferometer: In a delay interferometer in which a Michelson delay interferometer unit is mounted in a package, the delay interferometer includes a Michelson delay interferometer unit which outputs first interference output light from a first output port, the first interference output light being obtained by optically processing input light received through... Agent: Sughrue-265550

20090304395 - Tunable electrical return-to-zero modulation method and apparatus: A tunable duty cycle electrical return-to-zero (RZ) modulation method is realized through tuning of some electrical parameters of an encoder without the need for expensive and/or bulky optical pulse carver, therefore providing a universal RZ apparatus suitable for various high speed applications such as at 10 Gb/s, 40 Gb/s and... Agent: Jin Hong

20090304397 - Light receiving device and light receiving method: The light receiving device includes a pixel array, such as a two-dimensional pixel array, of pixels each having a light-receiving element for receiving input signal light, an output selecting unit for selecting the outputs of pixels within the pixel array, a selected output adding unit for adding and outputting the... Agent: Arent Fox LLP

20090304396 - Optical receiver and method of detecting loss of optical signal of the optical receiver: The optical receiver includes: a photoelectric conversion circuit for receiving an optical signal and converting the received optical signal into an electrical signal; a comparator for outputting a first determination signal (S1) when a voltage corresponding to the optical signal does not reach a first threshold value (TH1) and for... Agent: Antonelli, Terry, Stout & Kraus, LLP