Optical communications inventions 03/07

20070071441 - Signal identification method: A signal identification method for efficiently identifying Dense Wavelength Division Multiplexing (DWDM) channel modulation formats, signal powers, and center frequency detuning of signals that may be used in conjunction with telecom-grade monitoring equipment. The method utilizes least-square curve fitting estimates applied to a set of curves, each curve is characteristic... Agent: Werner & Axenfeld, LLP

20070071442 - Ring map discovery and validation method and system for optical network applications: A method and system for generating a ring map for optical network applications. The method includes sending a first discovery message to a first node through a portion of an optical network. The first node corresponds to a first node identification and a first predetermined identification. The first discovery message... Agent: Townsend And Townsend And Crew, LLP

20070071443 - Signal multiplexing apparatus and stuff controlling method therein: A signal multiplexing apparatus has an OPU/ODU processing unit putting a local protocol signal into an OPU/ODU signal, an ODTU processing unit generating an ODTU signal from the OPU/ODU signal, a read-out position detecting unit detecting a read-out position at the time that the OPU-ODU processing unit reads out the... Agent: Staas & Halsey LLP

20070071444 - Optical module, optical transceiver, and optical joint sleeve: An optical module 1 comprises a first optical element F1, a first light receiving subassembly PD1, a second optical element F2, a second light receiving subassembly PD2, a light emitting subassembly LD3 for generating light, and a light transmitting part 3 optically coupled to the first optical element. The light... Agent: Fish & Richardson P.C.

20070071445 - Method, apparatus and system for n-dimensional sparse memory using serial optical memory: In some embodiments, a method, apparatus and system for n-dimensional sparse memory using serial optical memory are presented. In this regard, a memory device is introduced to circulate a signal among a plurality of optical emitters and receivers. Other embodiments are also disclosed and claimed.... Agent: Blakely Sokoloff Taylor & Zafman

20070071446 - Photo-electronic frequency multiplier: An exemplary photo-electronic frequency multiplier (100) includes an intervening optical signal generator (10), a pair of photo-electronic conversion circuits (21, 22), a differential amplifier circuit (30), and a signal processing circuit (40). The intervening optical signal generator includes a light source (11), a first mirror (12), a first reflector (14),... Agent: PCe Industry, Inc. Att. Cheng-ju Chiang Jeffrey T. Knapp

20070071447 - Optical receiving apparatus and dispersion compensating method therein: An optical receiving apparatus has a route change detector for detecting occurrence of a route change of received signal light, a memory for beforehand storing optimum dispersion compensation quantity for the received signal light before and after the route change, a tunable dispersion compensator for compensating dispersion of the received... Agent: Staas & Halsey LLP

20070071448 - Dynamic range measurement and calculation of optical keyless entry sensor: An optical keyless entry sensor system and method includes an optical sensor in association with a mirror that reflects light transmitted from the optical sensor, wherein reflected light is detectable by the optical sensor. An attenuation filter can be located between the mirror and the optical sensor, wherein the attenuation... Agent: Kris T. Fredrick Honeywell International Inc.

20070071449 - All-optical methods and systems: An all-optical modulation format converter for converting optical data signals modulated in an on-off-keying (OOK) format to a phase-shift-keying (PSK) format. The OOK-to-PSK converter can be coupled to a delay-line interferometer to provide an all-optical wavelength converter for differential PSK (DPSK). The OOK-to-PSK converter can also be used in all-optical... Agent: Brosemer, Kolefas & Associates, LLC - (lucent)

20070071451 - Methods and systems for controlling optical power attenuation: Methods and systems for controlling optical power attenuation are provided. A method comprises periodically measuring an optical power of an optical signal received by an optical receiver and periodically measuring a first attenuation control signal voltage. When the optical power measurement is outside a target power range, the method continues... Agent: Fogg & Powers LLC

20070071450 - Systems and methods for optical power window control: Methods and systems for controlling optical power levels in an optical communications network are provided. In one embodiment, a system comprises means for demodulating one or more radio frequency communications signals from a modulated optical signal, wherein the means for demodulating measures an optical power level of the modulated optical... Agent: Laura A. Ryan

20070071452 - Optical-fiber wavelength generator, array structure and laser semiconductor device: An optical-fiber signal generator is provided, which includes a driving unit having an adjustable output current; a laser source driven by the output current, wherein a spectrum of the laser source includes at least one resonant wavelength; an optical coupler having a plurality of coupling terminals, wherein one of the... Agent: J.c. Patents, Inc.

20070071454 - Method and system for ultra-high bit rate fiber-optic communications: A method and system for ultra-high bit rate fiber-optic communications (e.g., 160 Gb/s) utilize a phase-correlated modulation format where phases of bits in adjacent four-bit groups in transmitted optical pulse trains are altered by π (or 180°).... Agent: Patterson & Sheridan, LLP/ Lucent Technologies, Inc

20070071453 - Multilevel amplitude and phase encoded signal generation: A method and apparatus for generating multilevel amplitude and phase encoded signals using a pair of 1:N beam splitter/combiner(s) having a pre-defined splitting distribution and an array of zero-biased, Mach-Zehnder Modulators configured for phase modulation.... Agent: Brosemer, Kolefas & Associates, LLC - (lucent)

20070071455 - Automatic gain control: A method and apparatus is presented for providing improved responsiveness of a receiver device. One embodiment includes a receiver device including an avalanche photodiode (APD), a transimpedance amplifier (TIA), and an automatic gain control (AGC) device configured to adjust the reverse bias voltage applied to the APD according to an... Agent: Bergman & Song, LLP

20070071456 - Optical heterodyne receiver and method of extracting data from a phase-modulated input optical signal: An optical heterodyne receiver and a method of extracting data from a phase-modulated input optical signal. In one embodiment, the optical heterodyne receiver includes: (1) a photonic quadrature demodulator having first and second optical inputs and first and second electrical outputs and configured to generate at the first and second... Agent: Hitt Gaines, PC Lucent Technologies Inc.

20070071457 - Optical receiver device: A DQPSK receiver extracts first and second phase modulation components from an input optical signal, and respectively converts the extracted components into the first and second data signals. The DQPSK receiver extracts a clock signal from one of the data signals, and produces an inverted clock signal by inverting the... Agent: Bingham Mccutchen LLP

20070065146 - Method and arrangement for the transmission of working signals and protection signals via optical data networks: According to the invention, working signals are transmitted between network elements via a first communication path. The protection signals are transmitted continuously or in case of a fault at the same wavelength as the working signals via a second communication path of an optical network while the polarization of the... Agent: Siemens Corporation Intellectual Property Department

20070065147 - Arrangement, system, and method for accurate power measurements using an optical performance monitor (opm): An arrangement has a WDT (Wavelength-Dependent Tap) coupled in an OCS (Optical Communication System) and an OPM (Optical Performance Monitoring) function coupled to the WDT. The WDT is adapted to receive from the OCS an input optical signal having noise and channels at respective channel wavelengths. The WDT couples to... Agent: Smart & Biggar P.o. Box 2999, Station D

20070065148 - Diagnosis method and diagnosis chip for the determination of the bandwidth of optical fibers: For determination of the bandwidth of optical fibers, the invention proposes a method which comprises the injection of light at a first optical power level and at a first frequency into an optical fiber, as well as the measurement of a first signal level as a function of the optical... Agent: Demont & Breyer, LLC

20070065149 - Data communication network using optical power averaged multiplexing: An optical network system, including multiple nodes, an optical switch, and a switch controller, is configured to achieve communication in the optical domain. Each node is configured to receive both high frequency and low frequency inputs, generally utilized for handling data and addressing information, respectively. The two types of information... Agent: Oppenheimer Wolff & Donnelly LLP

20070065150 - Secure optical communication: The present invention relates to a secure optical communication scheme. The differential delay D in an unbalanced Mach-Zehender interferometer results in two copies of the optical source signal at a remote phase modulator separated in time by D. As D is much bigger than the coherence time source, the two... Agent: Nixon & Vanderhye, PC

20070065151 - Optical transceiver with custom logging mechanism: An optical transceiver that custom logs information based on input from a host computing system (hereinafter referred to as a “host”). The optical transceiver receives input from the host concerning which operational information to log; the operational information may include statistical data about system operation, or measured parameters, or any... Agent: Workman Nydegger (f/k/a Workman Nydegger & Seeley)

20070065153 - Optical line terminal in a wavelength division multiplexing passive optical network: An OLT in a WDM-PON may include a main board and a sub board. The main board may include a master optical transmitting/receiving control/supervising section and the sub board may include a plurality of optical transceivers and a slave optical transmitting/receiving control/supervising section. The master optical transmitting/receiving control/supervising section may... Agent: Fleshner & Kim, LLP

20070065152 - Reconfigurable multiple port transponder: A transponder unit which relays signals between a plurality of channels of an optical transport network and a plurality of clients. The interconnections within the transponder unit are reconfigurable for selective connections. A connection between a first client and a first network channel and a connection between a second client... Agent: Aka Chan LLP / Cisco

20070065154 - Methods and system for quantum key distribution over multi-user wdm network with wavelength routing: A system and a method for quantum key distribution over a multi-user wavelength division multiplexing (WDM) network are disclosed. The system comprises a tunable or multi-wavelength transmitter; a plurality of receivers, each assigned a receiving-wavelength; and a multi-user WDM network linking the transmitter to the receivers. The transmitter can select... Agent: Darby & Darby P.C.

20070065155 - System and methods for quantum key distribution over wdm links: A system and a method for quantum key distribution between a transmitter and a receiver over wavelength division multiplexing (WDM) link are disclosed. The method includes providing one or more quantum channels and one or more conventional channels over the WDM link; assigning a different wavelength to each of the... Agent: Darby & Darby P.C.

20070065156 - Fiber-optics multiplexed interferometric current sensor: A fiber-optics multiplexed interferometric current sensor is provided. A broadband light source (BLS) is adapted for providing a light wave, and a depolarizer is coupled to the BLS. A depolarizer and a wave detector are respectively coupled to a first port and a third port of an optical spliter. A... Agent: Jianq Chyun Intellectual Property Office

20070065157 - Optical signal reception device and method of controlling optical signal reception: An optical signal reception device is disclosed that receives and demodulates an optical signal modulated by DQPSK and performs logical inversion and other controls to transit to the object reception state. The signal reception device includes a front end including a delay interferometer and an opto-electric conversion element that receive... Agent: Staas & Halsey LLP

20070065158 - Mobile terminal apparatus: An optical communication unit performs a bidirectional information transmission between a circuit device in a fixed housing and a circuit device in a moving housing with an optical signal. The optical communication unit includes a light transmitting unit that transmits the optical signal, a light receiving unit that receives the... Agent: Armstrong, Kratz, Quintos, Hanson & Brooks, LLP

20070065159 - All-optical 2r regenerator for multi-channel communication: An optical 2R regenerator includes a decreasing dispersion optical fiber (DDF), or a Raman pump, or both.... Agent: Corning Incorporated

20070065160 - Data communication unit using light-emitting diode for data communication, and electronic device: The present invention enables device downsizing by utilizing a light-emitting diode as a plurality of interfaces. A light-emitting diode 11 of a data communication unit using a light-emitting diode for data communication outputs light when a current flows therethrough. A transmission circuit 13 applies a forward bias to the light-emitting... Agent: Reed Smith, LLP Attn: Patent Records Department

20070065161 - Optical transmitting apparatus and optical communication system: A data modulator unit generates a DQPSK optical signal in accordance with a data signal. A phase shift unit provides a phase difference of π/2 between a pair of arms. A photodetector converts an output signal of the data modulator unit into an electrical signal. A filter is a low-pass... Agent: Bingham Mccutchen LLP

20070065162 - Signal waveform deterioration compensator: The waveform deterioration detection range is broadened and multi bit rates can be handled. A chromatic dispersion compensator (or polarization mode dispersion compensator) (102) receives a waveform-deteriorated NRZ optical signal entered through an input fiber (101) and compensates it. On the other hand, an optical detector (106) receives part of... Agent: Reed Smith LLP

20070058973 - Optical termination system: An optical termination system is provided. The optical termination system includes a working Optical Line Terminal (OLT) that communicates with a plurality of Optical Network Units (ONUs) near end users through an optical transmission line. The OLT includes a control information storage to store control information of the plurality of... Agent: Christie, Parker & Hale, LLP

20070058974 - Method for operating a massive optical network, optical line termination and transmission frame structure: A method for operating a passive optical network transmitting sub-frames of data arranged in a common transmission frame in at least two signalling modes from an optical line termination to a plurality of optical network units comprises the step of arranging first sub-frames of data to be transmitted in a... Agent: Sughrue Mion, PLLC

20070058975 - Optical transmission system for radio access and high frequency optical transmitter: Modulators respectively modulate baseband signals into IF signals having different frequencies. A multiplexer multiplexes the IF signals. An electrical-optical converter intensity modulates the multiplexed IF signals into optical signals. A local oscillation signal source outputs a predetermined local oscillation signal. An external modulator intensity-modulates the optical signal using the local... Agent: Wenderoth, Lind & Ponack L.L.P.

20070058976 - Laser drivers for closed path optical cables: Simplified laser drivers for closed path digital optical cables and digital optical cables including the simplified laser drivers. The laser driver can include less transistors than conventional laser drivers for optical communication cables. The laser can include a bias source and modulation source. The bias source can have a single... Agent: Workman Nydegger (f/k/a Workman Nydegger & Seeley)

20070058977 - Optical to radio frequency detector: An optical to radio frequency detector comprising an optical guide (11 to 14) for receiving two optical signal components having frequencies that differ by an amount corresponding to a radio frequency, and a radio signal guide (15, 16) coupled with an interaction zone (14) of the optical guide for propagating... Agent: Freescale Semiconductor, Inc. Law Department

20070058978 - Wireless remote access base station and pico-cell system using the same: A wireless remote access base station for converting a downstream optical signal to a downstream radio frequency (RF) signal, transmitting the converted downstream RF signal wirelessly, converting a received upstream RF signal to an upstream optical signal, and transmitting the upstream optical signal is provided. The remote base station includes:... Agent: Cha & Reiter, LLC

20070058979 - Optical transceiver module for monitoring an optical fiber and method for making available measuring data from monitoring an optical fiber: The invention concerns a transceiver module for an optical data network, comprising an optical interface for connection with an optical transmission line and an electrical interface for connection with a host board, wherein the electrical interface is suitable for providing the transceiver module with payload data to be sent on... Agent: Sughrue Mion, PLLC

20070058980 - Optical transceiver suppressing radiation noise form transmitter to receiver: An influence of noise propagated from a transmitting circuit to a receiving circuit is reduced in an optical transceiver. The optical transceiver includes a transmitter optical subassembly (TOSA), a receiver optical subassembly (ROSA) including a light receiving element, a transmitting circuit for driving a light emitting element in TOSA, a... Agent: Dennis C. Rodgers Smith, Gambrell & Russell

20070058981 - Optical module and data communication system including the optical module: An optical module includes a fiber array, a laser diode array, a photodiode array and a micro-lens array. The fiber array includes optical fibers which are divided to a transmitter group and a receiver group. The laser diode array includes laser diodes which are grouped in a transmitter group. The... Agent: Oblon, Spivak, Mcclelland, Maier & Neustadt, P.C.

20070058982 - Surface emitting laser, photodetector and optical communication system using the same: A surface emitting laser includes a plurality of light-emitting portions for emitting laser light beams in different linearly polarized light directions. The light-emitting portions are formed on the substrate and located close to each other. The light-emitting portions include metal opening arrays through which light beams in different linearly polarized... Agent: Mcdermott Will & Emery LLP

20070058983 - Method and system for providing controlled impairments to an optical transport system: Systems and methods for providing controlled impairments to an optical transport system are disclosed. In one implementation, an optical stream is received. A clock signal and a data signal are identified based on the received optical signal. A selection indicating at least a particular bit position of the optical stream... Agent: Brinks Hofer Gilson & Lione

20070058984 - Network management system for an optical network: In a network management system for an optical network, wherein the optical network comprises at least one optical fiber line (1) for transmitting an optical signal having a plurality of optical amplifiers (2) and the network management system comprises a central management unit (5) for controlling the optical amplifiers (2),... Agent: Sughrue Mion, PLLC

20070058985 - Optical networking module including protocol processing and unified software control: An optical networking module is formed with an integrated module including optical, optical-electrical and protocol processing components, and complementary software. In one embodiment, the integral protocol processing component is a single ASIC and supports multiple protocols. The module is further equipped with support control electronics in support of control functions... Agent: Berkeley Law & Technology Group

20070058986 - Optical network regenerator bypass module and associated method: An optical bypass element for an optical communication system. The optical bypass element, formed of an optical interleaver, is positioned in parallel with a regenerator. Data requiring regeneration is caused to be provided to the regenerator while data not requiring regeneration is bypassed about the regenerator by way of the... Agent: Alcatel Usa Intellectual Property Department

20070058987 - Visible light communication system and method therefor: In a visible light communication system, a transmission device includes a data modulation section which assigns 1-bit information to each of visible lights of RGB, and modulates transmission data into 3-bit modulation data. An LED light emission section transmits a multiplexed visible light signal, in which the RGB visible lights... Agent: Finnegan, Henderson, Farabow, Garrett & Dunner LLP

20070058988 - Optical transmission system, optical transmitter for optical transmission system, and optical for optical transmission system: An optical transmission system is provided in which the optimum operating point of a Mach-Zehnder interferometer, matched to the optical frequency of the light source on the transmitting side, can be set. The optical receiver (2) has an infinitesimal-modulated signal component detection circuit (222), which uses the signal train output... Agent: Harness, Dickey & Pierce, P.L.C

20070058989 - In-situ power monitor providing an extended range for monitoring input optical power incident on avalanche photodiodes: Disclosed are an in-line monitoring apparatus, an optical receiver and a method for monitoring an input power of an optical signal in which one or more power monitoring stages, for example can measure the input power over an extended input power range. In one embodiment, an apparatus includes an avalanche... Agent: Cooley Godward Kronish LLP

20070053687 - Optical transmission system constructing method and system: An optical transmission system accomplishes optical transmission over a long distance by combining a multiplexing line terminal with optical amplifiers, linear repeaters, and regenerators with optical amplifiers combined together. The system also accomplishes the optical transmission over a short distance by directly connecting the linear terminals therebetween, with an electric-to-optic... Agent: Kenyon & Kenyon LLP

20070053688 - Deliberate signal degradation for optimizing receiver control loops: Techniques to control an optical receiver having a control loop using Bit Error Rate (BER). In one implementation, a bit error rate (BER) associated with a received optical signal is determined. Indication of the BER to a control loop adapted is provided to adjust the optical signal in a manner... Agent: Patterson & Sheridan, LLP/ Lucent Technologies, Inc

20070053689 - Optical lan terminal device and optical lan system: An optical LAN terminal device includes an optical input connected to an external optical fiber so that an optical signal is supplied via the optical fiber to the input, an optical output connected to the optical fiber so that an optical signal is delivered via the optical fiber, a signal... Agent: Akin Gump Strauss Hauer & Feld L.l.p.

20070053691 - Optical clock recovery: The invention relates to clock recovery in optical communication systems. Optical clock frequencies are recovered from a plurality of optical channels by using a single optical resonator. The optical resonator is matched with the carrier frequencies and the sideband frequencies of the data signals sent at different channels. The separation... Agent: Venable LLP

20070053690 - Optical demultiplexer and receiver assembly: Apparatus for demultiplexing a wavelength division multiplexed optical signal comprising a plurality of signals each having a different wavelength. The apparatus comprises a demultiplexer sub-assembly and a multi-channel receiver optical sub-assembly. The demultiplexer sub-assembly comprises a filter block sub-assembly for splitting the input optical signal. The receiver optical sub-assembly comprises... Agent: William L. Boootjer

20070053692 - 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: Terry J. Stalford, Esq. Baker Botts L.l.p.

20070053693 - Wireless optical data probe: A portable data probe includes a portable housing, an optical transceiver circuit and a wireless communication circuit. The optical transceiver circuit is disposed substantially within the portable housing, but is also configured to be in optical communication with an exterior of the portable housing. The optical transceiver circuit is operable... Agent: Maginot, Moore & Beck LLP Chase Tower

20070053694 - Optical multi-channel free space interconnect: Various embodiments of the present invention provide optical multi-channel free space interconnects that provide optical channel isolation, thereby reducing crosstalk.... Agent: Rothwell, Figg, Ernst & Manbeck, P.c.

20070053695 - Free space optics alignment method and apparatus: A novel free space optics transceiver is disclosed comprising at least one light source, at least one photodetector, corresponding positioning means that can independently adjust the position of the light source and the photodetector, and a controller that can send and receive alignment frames conforming to a communications protocol to... Agent: Georgios Margaritis

20070053696 - Optical amplifiers in a free space laser communication system: Disclosed is a novel free space optical communication system comprising an optical amplifier configured to amplify an optical signal received from a fiber optic cable, a transmitter coupled to the optical amplifier and configured to transmit the amplified optical signal across a free space medium. The system also includes a... Agent: Meyertons, Hood, Kivlin, Kowert & Goetzel, P.c.

20070053697 - Parallel precoder circuit: A parallel precoder circuit executes a differential encoding operation on an n-row parallel input information series, and outputs an n-row parallel output information series, where 2≦n. Output sets of differential encoding operation circuits each of which having a largest column number from among differential encoding operation circuits disposed in first... Agent: Oblon, Spivak, Mcclelland, Maier & Neustadt, P.c.

20070053698 - Free space optics photodetector and transceiver: A novel optical detection apparatus is disclosed comprising a plurality of photodetectors and a plurality of transimpedance amplifiers wherein the photodetectors and the amplifiers are electrically connected to each other and are located in close proximity to each other, thus allowing the detecting of high frequency optical signals over a... Agent: Georgios Margaritis

20070053699 - Optical receiver: An optical receiver of the present embodiment has a light-receiving block, a discriminating block, a detecting block, a controlling block, and an adjusting block. The light-receiving block generates complementary signals in accordance with a photo current output from a semiconductor light-receiving element which receives an optical signal. The discriminating block... Agent: Smith, Gambrell & Russell

20070047954 - Method and apparatus for control of dpsk and dqpsk receivers and transmitters: An optical communication device such as a transmitter or receiver has a control loop for controlling relative phase of two related optical signals based on signal peak intensity. An optical transmitter measures the signal peak intensity of a combined optical signal representing two data channels to adjust relative phase as... Agent: Weingarten, Schurgin, Gagnebin & Lebovici LLP

20070047955 - Fast optical switch: A last optical switch is needed to realize an economical and scaleable optical-core network. In the disclosed optical switch, switching is effected by rapid wavelength conversion. Either channel switching, Time Division Multiplex (TDM) switching or both may be provided by the fast optical switch. The operation of the fast optical... Agent: Withrow & Terranova, P.l.l.c.

20070047956 - Repeater and optical communication system: Disclosed is a repeater including: a recognizing unit to recognize a destination address of an optical packet from the optical packet which includes the destination address assigned in unit of bit and a bit indicating whether or not a plurality of destination addresses are assigned; an optical splitting unit to... Agent: Sughrue Mion, PLLC

20070047957 - Optical packet network system: An optical packet network system of a ring type, capable of preventing degradation of an optical signal, can be implemented by providing a mechanism relatively simple in structure, capable of erasing light noise if the optical packet signal does not exists. In the optical packet network system made up by... Agent: Westerman, Hattori, Daniels & Adrian, LLP

20070047958 - System and method for bandwidth allocation in an optical light-trail: The present invention relates to allocating the use of optical light-trails. Optical light-trails enable a plurality of nodes included in a light-trail to share the use of an optical wavelength to transmit traffic between the nodes included in the light-trail. A method for allocating the use of an optical light-trail... Agent: Baker Botts L.L.P.

20070047959 - System and method for supporting communications between subcriber optical interfaces coupled to the same laser transceiver node in an optical network: A backwards compatible method and system for receiving upstream frames and reflecting the frames downstream to support communications between subscriber optical interfaces (SOIs) coupled to a same laser transceiver node (LTN) are explained. Backwards compatible means that the method or system is compatible with legacy subscriber optical interfaces that do... Agent: King & Spalding LLP

20070047960 - Method and apparatus for controlling level of each signal included in wavelength-multiplexed signal: A method for an intermediate node to control a level of a signal included in a wavelength-multiplexed signal and transmitted from a source node to a destination node via the intermediate node, includes: detecting a level of the signal; identifying a position of the intermediate node with respect to the... Agent: Bingham Mccutchen LLP

20070047961 - Infrared communication receiver: In order to adjust and decrease an acoustic pressure of a speaker driven based on an audio signal, an infrared communication receiver includes: a receiving section for receiving via infrared communication an audio signal representing audio data; and a speaker driving section for driving a speaker based on the audio... Agent: Birch Stewart Kolasch & Birch

20070047962 - Optical fiber and optical device using the same: This invention relates to an optical fiber and others having a structure for efficiently generating SC light while realizing high nonlinearity over a wide band. The optical fiber has at least a center core region, and an outside cladding region having a refractive index lower than that of the center... Agent: Mcdermott Will & Emery LLP

20070047965 - Dynamic amplitude and spectral shaper in fiber laser amplification system: A method for overcoming the drawback in a fiber CPA laser system that includes a process of generating a large negative TOD by implementing an AODS in a pulse shaper as a dispersive component. The AODS is implemented to arbitrarily modulate both the spectrum shape and phase to control with... Agent: Bo-in Lin

20070047964 - Optical receiving apparatus and method for controlling the optical receiving apparatus: An optical receiving apparatus sets, efficiently and optimally, a delay interferometer and a variable wavelength dispersion compensator in the apparatus. The apparatus has a variable dispersion compensation unit performing variably dispersion compensation on a received optical signal, a delay interference unit performing a delay interference process on the optical signal... Agent: Bingham Mccutchen LLP

20070047963 - Optical transceiver having parallel electronic dispersion compensation channels: An optical receiver including a demultiplexer, a plurality of detectors and a plurality of electronic dispersion compensation (EDC) circuits. The demultiplexer demultiplexes an optical beam including a plurality of optical beam components having different wavelengths into separate optical beams. The plurality of detectors receive the optical beams and convert the... Agent: Christie, Parker & Hale, LLP

20070047966 - Differential multilevel modulated optical signal receiver apparatus: A first optical splitter splits an input optical signal and outputs it to first and second optical paths. A second optical splitter outputs the optical signal from the first optical path to third and fourth optical paths. A third optical splitter outputs the optical signal from the second optical path... Agent: Staas & Halsey LLP

20070047967 - Method and arrangement for demodulating an optical dpsk binary signal: An optical differentially phase shift keyed or DPSK binary signal which in the event of phase changes exhibits amplitude reductions and is phase-demodulated is provided. The received optical DPSK binary signal is additionally amplitude-demodulated and resulting phase and amplitude information is evaluated.... Agent: Siemens Corporation Intellectual Property Department

20070047968 - Method, apparatus and system for high-speed transmission on fiber optic channel: Multi-carrier modulation fiber optic systems constructed using a series of electrical carriers, modulating the data on the electrical carriers and combining the carriers to form a wideband signal. The wideband signal can then be intensity modulated on a laser and coupled to a fiber optic channel. A receiver may then... Agent: Mcandrews Held & Malloy, Ltd

20070047969 - Differential quadrature phase-shift modulator and method for setting driving voltage thereof: The present invention is directed toward a method for setting a driving voltage of a differential quadrature phase-shift modulator, this method making signal quality superior in response to an individual difference in extinction ratio due to variations in manufacture of a device. To this end, signal quality of differential quadrature... Agent: Staas & Halsey LLP

20070047970 - Multi-rate clock signal extracting method and multi-rate clock signal extracting device: A multi-rate clock signal extracting device includes a light modulator, a photoelectric converter, a band-pass filter unit, a phase comparison unit, a bit rate changeover switch and a modulating electric signal generating unit. The light modulator modulates a light signal according to a modulating electric signal as a mixing signal... Agent: Rabin & Berdo, PC

20070047971 - Rz-dpsk optical receiver circuit: A received RZ-DPSK signal is guided to an interferometer. The interferometer comprises a 1-bit delaying element in an upper arm. A balanced photodiode converts a pair of optical signals output from the interferometer into electrical signal. A high-pass filter, which has a cut-off frequency equal or approximately equal to the... Agent: Edward Pennington Swidler Berlin LLP

20070047972 - Dqpsk optical receiver circuit: A DQPSK optical signal is split by the splitter 1 into Data 1 and Data 2 systems. For each system, a phase-modulated optical signal is converted into an intensity modulated electric signal, and clock reproduction and data reproduction are independently carried out for each system. While a phase difference occurs... Agent: Bingham Mccutchen LLP