Optical communications inventions 01/06

20060018656 - Optical cross connect apparatus and optical transmission system: Disclosed is an optical cross connect apparatus that is applicable to an end office node and relay node in a path. The optical cross connect apparatus includes an optical switch for generating plural optical output signals from plural optical input signals; an optical level monitor section for detecting the optical...

20060018657 - Method and apparatus of circuit configuration and voice traffic transport: A method according to an embodiment of the invention includes configuring a virtual circuit according to a fixed structured data transport (SDT) structure to transport traffic for provisioned and unprovisioned voice lines supported by an ONU....

20060018659 - Optical transmission equipment preventing mulfunction in recovery from fault: An optical transmission apparatus includes a demultiplexer for separating wavelength-division multiplexing light received from a first optical transmission line into signals of different wavelengths to transmit the signals to an outside and a multiplexer for multiplexing signals of different wavelengths received from the outside to transmit multiplexed signals to a...

20060018658 - Wavelength division multiplexing optical transmission system: A WDM optical transmission system of the invention has a configuration where WDM light generated at a wavelength multiplexing station is transmitted via a plurality of stations such as optical add-drop stations, arranged on an optical transmission line, and control of the power of the optical signals of respective wavelengths...

20060018660 - System and method for setting a tunable filter in an optical network: A method and a system for setting a tunable filter in an optical network are provided. In one embodiment, a method for setting a tunable filter in an optical network includes rejecting a reference wavelength using a fixed filter from an input optical signal to generate a passthrough optical signal....

20060018661 - Alignment system: A free space point-to-point signaling system is described in which optical beams generated by two free space transceiver units are optically aligned with each other using beam steering techniques. Once aligned, each transceiver unit detects the received signal strength and transmits this information to the other transceiver unit. This information...

20060018663 - Acquisition of a wireless network node: A digital data network (100) uses network nodes (106) incorporating infrared transceivers (108). Each node (106) includes a plurality of infrared transceivers (108) having transmitter (109) and receiver (11) optics designed to facilitate line-of-sight infrared optical communications in a residential or business neighborhood. New nodes (106) are installed in an...

20060018664 - Optoelectronic device capable of participating in in-band traffic: An optoelectronic device that has a network address (e.g., IF address) and participates in in-band traffic for purposes of performing functions (e.g., network diagnostics, network control, network provisioning, fault isolation, etc.) that are traditionally performed by host equipment. An embodiment of the invention may have a protocol engine and a...

20060018662 - Recovering energy from an irda/remote control transmitter circuit: A portable electronic device with an IrDA transmitter LED is used to transmit both IrDA signals and remote control infrared signals. The device transmits remote control infrared signals with reduced power consumption. During a relatively longer remote control signal pulse, an inductor saturates and stores energy when a drive current...

20060018665 - Route determination method used in optical signal transmission system: A method of determining a transmission route for optical signals in an optical signal transmission system comprising a transmitter for optical signals, a receiver for the optical signals, and repeaters for repeating the optical signals transmitted from the transmitter to the receiver, and having transmission routes between the transmitter and...

20060018666 - Adiabatically frequency modulated source: A Distributed Feed-Back (DFB) laser integrated with an Electroabsorption (EA) modulator whose facet at the end of EA modulator section has finite reflectively to create adiabatic chirp by optical feedback to the DFB laser....

20060018667 - Optical transmission apparatus using duobinary modulation: An optical transmission apparatus using duobinary modulation adapted to an optical communication system using dense wavelength division multiplexing (DWDM) is disclosed. The duo-binary optical transmission apparatus includes an electro-absorption modulated laser (EML) for performing a light intensity modulation operation based on an electrical data signal and producing a modulated optical...

20060018668 - Multi-wavelength pulse generator using time-lens compression: A method and apparatus for generating a multi-wavelength pulse train use a technique referred to as time-lens compression. The time-lens is formed of a phase modulator in series with a dispersion element. In addition to pulse compression, this time-lens simultaneously displaces the pulses according to their center wavelengths, resulting in...

20060018669 - Optical receiver with dynamic gain and bandwidth: The present invention provides an optical receiver applicable to various transmission rates. The optical receiver of the invention includes a main amplifier and a switching unit. The main amplifier amplifies a voltage signal output from the preamplifier, which converts the photocurrent to the voltage signal. The switching unit is inserted...

20060013582 - Optical communications processing system, components and operating method thereof: An optical information transmission system comprises a plurality of optical transmitters and receivers, each having ports for exchangeable waveguides. Each transmitter has an input for receiving an enable signal assigned to it, and is adapted to generate or not to generate an optical information signal according to the status of...

20060013583 - Optical transmission system: An optical amplifier may be quickly returned from a shutdown state to a regular state after getting recovery information of a fault. Gain setting by ASE is conducted to the repeaters on the up-stream side during the shutdown state, by outputting ASE light with the same intensity as the WDM...

20060013584 - Optical transmission system with two-mode ring protection mechanism for prioritized client signals: An optical transmission system that offers more efficient bandwidth usage in normal operation, as well as enhanced fault tolerance for higher service availability. A transponder converts high-priority and low-priority client signals into high-priority and low-priority wavelength signals to be added to network traffic. An optical switch fabric normally delivers high-priority...

20060013585 - Shared optical performance monitoring: An apparatus for shared optical performance monitoring (OPM) is provided. A wavelength sensitive device receives light at an input port and routes it wavelength selectively to a set of output ports. To perform optical performance monitoring on the output ports, a monitoring component of each output signal is extracted, and...

20060013586 - Optical switching station and connection method for the same: An optical switching station comprises a first plurality of input channels for through data traffic, a second plurality of output channels for through data traffic, at least one first optical switching matrix comprising a first group of input connectors connected to the input channels on the switching station and a...

20060013587 - Modular wavelength selective switch: Modular WSS (wavelength selective switch) designs are provided that allow a WSS to be built out for a first set of wavelengths, with the capacity for later expansion to handle a second set of wavelengths with minimal impact on the operation of the system for the first set of wavelengths....

20060013588 - Wdm laser wavelength control: A transmitter (11) emits a single wavelength optical signal and transmits this as a wavelength channel (13) in a compound multiplex signal through the WDM network. The receiver (12) selects the single wavelength optical signal (21) from the compound multiplex signal using a band-pass filter. A wavelength fit detector (15)...

20060013589 - Optical transmission system and method of controlling optical transmission system: A control method, which is applicable to a variety of network configurations, controls an optical transmission system to determine optimum optical input power to a transmission path for increased optical transmission quality. The optical transmission system has terminal stations, repeaters, dispersion compensation modules, and a dispersion compensation controller. The terminal...

20060013590 - Adaptive equalization in coherent fiber optic communication: An embodiment of the invention is a technique to equalize received samples. A coefficient generator generates filter coefficients using a rotated error vector. A filter stage generates equalized samples or slicer input vector from received samples or rotated received samples using the filter coefficients. The received samples are provided by...

20060013593 - Light intensity modulation element, intensity-modulated-light generating device, laser exposure unit and photograph processing apparatus: Disclosed is a light-intensity modulation element, which comprises a substrate made of a nonlinear optical crystal, and a light waveguide formed in a principal surface of the substrate to extend in one direction. The light waveguide includes first and second wavelength conversion portions for converting a part of infrared light...

20060013592 - Polarization mode dispersion compensation apparatus and method thereof in light wavelength division multiplexing transmission system: A signal for each wavelength is extracted from multiplexed light signals that are wavelength-multiplexed and transmitted, and an evaluation value showing a degree of signal deterioration caused by polarization mode dispersion for each wavelength is measured. Then, the wavelength of a target of the polarization mode dispersion compensation is selected...

20060013591 - Receiver for angle-modulated optical signals: The invention relates to a receiver for an angle-modulated optical signal, whereby the angle-modulated optical signal is injected into an optical resonator. Reflected light escapes from the optical resonator on a phase or frequency change of the angle-modulated optical signal. An optical decoupling device is arranged before the optical resonator,...

20060013594 - Apparatus and method for synchronizing optic repeater in communication system using time division ofdm scheme: Disclosed is a method for synchronizing of a first signal and a second signal in a communication system including a mobile station, an base station and an optic repeater, the base station and the optic repeater being connected via an optical cable. The first signal is transmitted between the base...

20060013595 - Multi-wavelength optical communication system: A multi-wavelength optical communication system includes a number of emitters each of which emits radiation at a different wavelength; a plurality of the detectors each of which senses radiation at a different wavelength corresponding to the radiation from one of the emitters and a shared waveguide including a scattering medium...

20060013596 - Bandwidth limited frequency shift keying modulation format: It is an object of the present invention to provide a method for processing optical signals showing real improvement for the transmission of optical signals over long distance at high bit rate but without implying to high costs. This is achieved by the use of a new modulation format (BL-FSK)...

20060013597 - Compensating impairments of optical channel using adaptive equalization: An embodiment of the invention is a technique to equalize received samples. An optical to electrical converter (OEC) produces an electrical signal vector representing at least one of amplitude, phase, and polarization information of a modulated optical carrier transmitted through an optical channel with impairments. A signal processor processes the...

20060008271 - Method of failure protection for digital transmission system in ring configuration, and relevant multiplexing device: A method of failure protection in a digital transmission system having a plurality of transmission elements connected in a ring configuration over metallic media, said ring configuration being formed by at least two paths, one path as a normal path for the transmission at the normal status, another path as...

20060008272 - Channelizer switch: An RF-photonics integrated communications module including: a plurality of RF input channels; a plurality of modulators each being responsive to one of the RF input channels; and, a plurality of photonic output channels coupled to the modulators via a switching network. The switching network includes a plurality of resonating elements...

20060008273 - Edge router for optical label switched network: An edge router for interfacing an optical label switched core IP network with client networks, which may be electronically switched and operate with different protocol. The core network has a limited number of ports, each with an edge router, which receives packets from one or more associated client networks and...

20060008274 - Hybrid rf/optical communication system with deployable optics and atmosphere compensation system and method: An antenna system for receiving both RF wave and optical wave radiation via a single antenna aperture that may be moved between stowed and deployed configurations as needed. The system includes a wavefront correction system for correcting optical wavefront distortion errors caused by anomalies in the shape of the antenna...

20060008275 - Apparatus and method for transmitting data in an aqueous medium: An apparatus and method for transmitting data in an aqueous medium is provided. The apparatus, comprising a transmitter having one or a plurality of LED transmitting components, which is configured, when immersed in an aqueous medium, to transmit light in a blue or green light wavelength, and a receiver configured,...

20060008276 - Optical signal transmission apparatus and optical signal transmission method: The present invention provides an optical signal transmission apparatus for carrying out bi-directional light transmission. The optical signal transmission apparatus includes: a light sending module, for sending an optical main-signal having at least one data width, and receiving an optical sub-signal including a control signal; a light receiving module for...

20060008277 - Optical communication system and receiving apparatus: A transmitting apparatus has a light source, and a receiving apparatus has a solar battery for converting optical energy into electrical energy to power the receiving apparatus. The transmitting apparatus converts digital data into an optical signal and transmits the optical signal by using the light source. The receiving apparatus...

20060008278 - Method and apparatus for crz-dpsk optical signal generation: Apparatus and methods for generating chirped return-to-zero (CRZ) differential phase-shift keyed (DPSK) optical signals using a single modulator driven by synchronous return-to-zero (RZ) drive signals to achieve simultaneous RZ pulse formatting and chirped DPSK data modulation....

20060008279 - Pattern-dependent error counts for use in correcting operational parameters in an optical receiver: An optical transmission network includes an optical transmitter photonic integrated circuit (TxPIC) chip, utilized in an optical transmitter and has a plurality of monolithic modulated sources integrated for multiple signal channels on the same semiconductor chip is provided with channel equalization at the optical receiver side of the network that...

20060008280 - Receiving circuit and electronic apparatus for optical communication: In an optical communication-use receiving circuit of the present invention, the pulse width of the received pulse which is a binary signal corresponding to the signal optical pulse is specified by using an integration circuit and a trigger generating circuit. If the pulse width of the received pulse is not...

20060002704 - Optical switch having an autorestoration feature for switching from a backup optical path to a primary optical path: Optical switches are provided in an optical transmission system having at least two optical nodes in optical communication over a primary optical path and a backup optical path. An optical switch is located in each of the optical nodes. Each of the optical switches includes a switching element having an...

20060002705 - Decentralizing network management system tasks: A system to decentralize network management tasks. The system includes an Optical Device Control (ODC) to provide management functionality of an optical network at a network element of the optical network. The ODC includes a control plane, a data plane, and an interface to pass information between the control plane...

20060002706 - Optical access network using wavelength-locked wdm optical source injected by incoherent light: The present invention relates to a passive optical network, which inexpensively improves the spectral efficiency of an access network and is capable of increasing the number of subscribers per channel by using WDM in combination with Time Division Multiplexing (TDM) or SubCarrier Multiple Access (SCMA) to expand a conventional WDM...

20060002710 - Application-specific microcode for controlling an optical transceiver: A method for an optical transceiver (or transmitter or receiver) to change from a first set of functionality to a second set of functionality that is different than the first set of functionality. The optical transceiver has at least one processor and a system memory. The optical transceiver has access...

20060002712 - Calibration of digital diagnostics information in an optical transceiver prior to reporting to host: An optical transceiver configured to perform calibration of digital diagnostics prior to providing the calibrated values to a host computing system (hereinafter referred to simply as a “host”) that is communicatively coupled to the optical transceiver. The optical transceiver includes a sensor that measures an analog operational parameter signal such...

20060002711 - Filtering digital diagnostics information in an optical transceiver prior to reporting to host: An optical transceiver configured to perform filtering of digital diagnostics prior to the filtered results being made accessible to a host computing system (hereinafter referred to simply as a “host”) that is communicatively coupled to the optical transceiver. The optical transceiver includes sensor(s) that measures analog operational parameter signals such...

20060002708 - Microcode-driven calculation of temperature-dependent operational parameters in an optical transmitter/receiver: An optical transceiver (or transmitter or receiver) that uses microcode that represents a formulaic relation between temperature and an appropriate value for an operational parameter given the temperature. The microcode is further structured such that when loaded into system memory and executed by the optical transceiver, the optical transceiver accesses...

20060002707 - Microcode-driven self-calibration of optical transceiver to environmental conditions: An optical transceiver (or transmitter or receiver) that uses microcode and an internal sensor to self-calibrate itself to an environmental parameter such as, for example, temperature. In particular, the optical transceiver senses the environmental parameter under changing environmental circumstances. The optical transceiver then calculates how an operational parameter such as...

20060002709 - Transceiver with persistent logging mechanism: An optical transceiver configured to transmit and receive optical signals. The optical transceiver includes a control module and a persistent memory. The control module is configured to identify operational information regarding the optical transceiver, and write log information representing the operational information to the persistent memory. The operation information may...

20060002713 - Optical link module, optical interconnection method, information processor including the optical link module, signal transfer method, prism and method of manufacturing the prism: An optical link module of the present invention for connecting light beams by deflection and including light-emitting devices arranged in a planar manner; an optical fiber bundle that is an optical waveguide for receiving the light beams from the light-emitting devices, and an optical turn which includes a plurality of...

20060002714 - Method and apparatus for optical signal transmission: A method and apparatus for transmission of optical signals across an optical transmission link wherein duobinary signals or inverse-data signals are transmitted when the chromatic dispersion of the transmission link is above or below a dispersion threshold, respectively, to significantly improve optical signal transmission performance....

20060002715 - Light source in optical transmission system, waveform shaper, optical pulse train generator, and optical reproduction system: The present invention provides a pulse train generator comprising: a dual-frequency signal light source for generating a dual-frequency signal; a soliton shaper for soliton-shaping output light from the dual-frequency signal light source; and an adiabatic soliton compressor for performing adiabatic soliton compression on output light from the soliton shaper, and...

20060002716 - Trail engineering in agile photonic networks: An agile transparent network with a trail routing and switching (also called “engineering”) mechanism is provided that enables efficient use of regenerators and wavelengths available in the network, while maintaining a very efficient time-to-service. The trail engineering mechanism allows fast, automatic establishment of new connections based on the current network...

20060002717 - Carrier suppression using adiabatic frequency modulation (afm): A method for suppression of the optical carrier of an optically modulated digital signal, comprising of the steps of: modulating the amplitude of an optical carrier with digital input data to generate an amplitude modulated optical signal; and modulating the frequency of the optical carrier of the resulting optical signal...

20060002718 - Chirp managed directly modulated laser with bandwidth limiting optical spectrum reshaper: A fiber optic communication system, comprising: an optical signal source adapted to produce a frequency modulated signal; and an optical spectrum reshaper adapted to receive the frequency modulated signal and output a substantially amplitude modulated signal; wherein the optical spectrum reshaper limits the bandwidth of the frequency modulated signal....

20060002719 - Pulse train optical transmission system and transmitter and receiver apparatuses used therein: An optical transmission system for optically transmitting at least one data signal includes pulse train generating means for converting each of the at least one data signal respectively to a pulse train, based on at least one encoding pattern that is uniquely predetermined corresponding to the at least one data...

20060002720 - Optical receiving unit reducing cross talk between optical transmitting unit and optical transmitting/receiving apparatus installing the same: The present invention provides an optical transceiver to reduce a crosstalk in sufficient. The optical receiving unit of the invention includes an O/E-converter, a signal processing unit, and an offset voltage setting unit. The input of the signal processing unit, connected to the output of the O/E-converter, receives an electrical...