Optical communications inventions 02/06

20060039696 - Method for wdm optical networks including alternate routes for fault recovery: A procedure for designing WDM optical networks provides both working circuits and protection circuits for carrying traffic demands between node pairs. The protection circuits are activated for the purpose of network recovery in case of a fault on a working circuit. Each protection circuit is link-disjoint, and preferably node-disjoint, from...

20060039697 - Autonomous optical path management device: An autonomous optical path management device that allows for failover without human intervention, and externally to the computer systems communicating with one another. In a preferred embodiment, a device is placed in the network between, for example, a server and a storage unit on an optical network. The device preferably...

20060039698 - System and method of communications with traffic signals: The present invention comprises a system and method for communicating with a traffic signal by which at least one communication controller and integrated light controller are coupled by a high frequency (“HF”) coupler to a power line for transmission. In each of the directions of communication, specific transmission methods and...

20060039699 - Countermeasures for idle pattern srs interference in ethernet optical network systems: Optical networks as defined by the IEEE 802.3ah standard suffer from Stimulated Raman Scattering (SRS) that causes data transmission at a first optical wavelength to interfere with broadcast video transmission at a second optical wavelength in single mode optical fibers. The problem is exacerbated when data is not being transmitted...

20060039700 - Passive optical network: A passive optical network using downstream and upstream optical signals for achieving a two-way communication is provided, wherein the downstream and upstream optical signals have different polarization components and an equal wavelength band....

20060039701 - Optical code division multiplexing communication method and system: An optical code division multiplexing communication method includes the steps of: producing a multi-wavelength optical pulse train from wavelength multiplexing pulse; transmitting the multi-wavelength optical pulse train through a transmission line using a time-spreading/wavelength-hopping method; decoding wavelength multiplexing pulse from the multi-wavelength optical pulse train transmitted through the transmission line;...

20060039702 - Automatic shutdown system and method for optical multiplexers and demultiplexers: An automatic shutdown system for optical multiplexers and demultiplexers includes an optical switch that is disposed in a common optical channel between a transmitter and a receiver of an optical communication system. The optical switch may attenuate or block a signal in the common optical channel during power-off conditions. The...

20060039703 - Wavelength division multiplexing optical transmission system: The objective of the present invention is to realize a chromatic dispersion compensation method which does not depend on a wavelength path in a photonic network to which a HUB node is applied and its monitoring control. In order to achieve this purpose, the present invention controls a plurality of...

20060039704 - Dynamic gain equalizer: The present invention provides a dynamic gain equalizer for flattening a gain profile of an optical amplifier. The dynamic gain equalizer includes: an optical waveguide circuit 2 having: a multistage optical coupler 7 which is formed by connecting optical couplers 1 arranged at a plurality of stages; a multistage optical...

20060039705 - Technique for photonic switching: A technique for photonic switching is disclosed. In one particular exemplary embodiment, the technique may be realized as a method for photonic switching. The method may comprise receiving at least one optical signal at a photonic line card, wherein the at least one optical signal comprises one or more wavelength...

20060039706 - Method and device for optical data transmission: The invention relates to a method and device for optical data transmission, in particular a method for transmission of data by means of digitised infrared signals. Data sequences are transmitted using a time-division multiplex access protocol with communication frames comprising single sequential windows with a given minimal bit transmission rate....

20060034608 - Method and system for providing a signature signal in an optical network in the event of loss of a client: An optical network including multiple nodes is subject to intermittent faults that may raise alarms in the system. The invention focuses on an optical network based on the Any rate architecture. A single fault such as a client failure at a node in such a network can give rise to...

20060034609 - System and method of self-configuring optical communication channels between arrays of emitters and detectors: A system for self-configuring optical communication channels between arrays of emitters and detectors comprises: an array of light emitters; an array of light detectors roughly aligned with the array of light emitters; and self-configuration logic for controlling the light emitters of the emitter array to transmit optical data to the...

20060034610 - Optical add/drop multiplexer: A core unit arranged in a transmission path includes a through path for causing an input signal to an input port to pass through to an output port, a drop-side port 25a that drops the input signal having a predetermined wavelength, and an add-side port 25b that adds channel having...

20060034611 - Method and system for reducing power consumption of irda enabled handsets by turning on/off an irda port dynamically: Certain aspects of reducing power consumption of IrDA enabled devices by dynamically turning ON/OFF an IrDA port may comprise receiving a first signal, which indicates that IrDA data is received. In response to receiving the IrDA data, a second signal such as an interrupt signal may be generated and sent...

20060034612 - Multi-data-rate optical transceiver: An optical transceiver module includes an optical-to-electrical converter configured to convert a first optical signal to a first electric signal, a first amplifier configured to amplify the first electric signal, a bandwidth controller coupled to the first amplifier, configured to control the frequency response characteristics of the amplification of the...

20060034613 - System and method of configuring fiber optic communication channels between arrays of emitters and detectors: A system for configuring fiber optic communication channels between arrays of emitters and detectors comprises: an array of light emitters; an array of light detectors; a bundle of optical fibers disposed between the arrays of light emitters and light detectors for conducting light from the light emitters to the light...

20060034614 - Adaptive optical equalization for chromatic and/or polarization mode dispersion compensation and joint opto-electronic equalizer architecture: An adaptive optical parallel equalizer architecture is based on a controllable optical FIR filter device to realize an optical FIR (finite-impulse-response) filter including a plurality of coefficient taps in order to have independent control of each optical FIR filter coefficient. A unique adaptive opto-electronic LMS (least mean square) process is...

20060034615 - Timing error reduction in qkd systems: Systems and methods for reducing or eliminating timing errors in a quantum key distribution (QKD) system (100) are disclosed. The QKD system has a pulse generator with retimer (PGRT) that includes a field-programmable gate array (FPGA) (or FPGA output) which is used as a timing generator (TG). While an FPGA...

20060034616 - Automatic bias control for an optical modulator: An automatic bias controller for an optical modulator is provided. The automatic bias controller comprises a driver for providing an electrical data signal to the modulator and bias means for providing a bias voltage to the modulator. A microprocessor provides a low frequency digital modulation signal, which is converted to...

20060034617 - Module to module signaling: A method and apparatus configured to transmit module data between optic modules over a primary communication channel, such as an optic fiber configured to carry network data or outgoing data. A control center may send the module data, such as any type of DDMI data, over the optic fiber to...

20060034618 - Adaptive optical equalization for chromatic and/or polarization mode dispersion compensation: An adaptive optical parallel equalizer architecture is based on a controllable optical modulator device to realize an optical FIR (finite-impulse-response) filter including a plurality of coefficient taps in order to have independent control of each optical FIR filter coefficient. A unique adaptive opto-electronic LMS (least mean squares) process is utilized...

20060034619 - Level detector for optical receivers: An apparatus and method for detecting an output power level of an optical receiver, in order to hold output signal levels constant over changing input optical levels. A photodetector detects an optical signal, and a current from the photodetector is applied an amplifier. The amplifier may be either a differential...

20060034620 - Low noise optical receiver: A low noise optical receiver includes an amplifier in a feedback network, which allows the value of a feedback resistor to be increased. The magnitude of the gain of the feedback amplifier is greater than one. By increasing the value of the feedback resistance, the effective noise of the receiver...

20060034622 - Optical receiver with increased dynamic range: An optical receiver with increased dynamic range includes a photodetector, a photodetector biasing network, an amplifier and a post-distortion network. The post-distortion network compensates for gain error in the amplifier, such that a composite output voltage is relatively linear with respect to input current. The dynamic gain responses of the...

20060034621 - Transimpedance amplifier with integrated filtering and reduced parasitic capacitance: A transimpedance amplifier (TIA) with integrated filtering. A capacitance is integrated into the TIA and connected to the power supply and to an internal ground of the TIA. Noise on the power supply of the transimpedance amplifier is filtered by the capacitor such that the power supply noise is reduced....

20060029390 - Optical distribution network monitoring method and system: This invention relates to a method for monitoring a passive optical distribution network and a monitoring system of an optical distribution network comprising at least one passive distribution node 1 and optical fiber links 3,4 of a drop section 5 backwards said passive distribution node 1 and at least one...

20060029389 - Optical network terminal with low power hibernation: The invention is directed to techniques for reducing power consumption by an optical network transmitter (ONT) in a passive optical network (PON). The techniques may be particularly useful in extending the period of battery powered telephone service during a power outage. In particular, the invention provides a hibernation mode in...

20060029391 - Optical network system: An optical network system enabling confirmation of connection and tracking of wavelength paths at a high speed and a low cost without introducing any special hardware by having a wavelength path monitoring unit in an NMS give temporary change of optical power through a change generating unit to an optical...

20060029392 - Method for providing high connectivity communications over a packet-switched optical ring network using composite packets: A system for providing high connectivity communications over a packet-switched optical ring network comprises a core optical ring having at least one node, the node being coupled to a subtending system by an optical crossbar switch, a source for generating a set of packets, a stacker for forming a first...

20060029393 - Wideband optical module and pon using the same: A wideband optical module includes a downward wideband light source for generating downward light, an upward wideband light source for generating upward light, a first circulator including a first to a third port for outputting multiplexed downward optical signals to the second port and for outputting multiplexed upward optical signals...

20060029394 - Optical multiplexing interconnect module: In an optical multiplexing interconnection module, first and second NRZ input signals synchronous by clock signal are inputted to its input section. The first NRZ input signal is converted to a first RZ signal according to a logical product with a clock signal CLK by a drive circuit and the...

20060029395 - Apparatus and method for frequency-shift-keying optical transmission: An optical transmission apparatus employing an FSK scheme is disclosed. The optical transmission apparatus includes a light generator arranged to generate a first tone signal having a first frequency and a second tone signal having a second frequency. The optical transmission apparatus also includes a light modulator including a second...

20060029396 - Flat-topped chirp induced by optical filter edge: A fiber optic communication system comprising: an optical signal source adapted to produce a binary amplitude modulated signal; and an optical spectrum reshaper adapted to receive the amplitude modulated signal and to change the instantaneous frequency of the signal at its 0-to-1 and 1-to-0 transitions so as to change the...

20060029397 - Method and apparatus for transmitting a signal using simultaneous fm and am modulation: There is provided method for transmitting binary data contained in respective successive time cells, the data being in the form of an optical signal obtained by amplitude modulation and frequency modulation of an optical carrier wave, with a 0 bit data value having a 0 bit mean amplitude having a...

20060029398 - Transmission of optical signals of different modulation formats in discrete bands: A method and apparatus for transmitting optical signals of different modulation formats in distinct bands. The optical signals within each band may be separated by a predetermined channel spacing, and the distinct bands may be separated by a predetermined band separation distance. The band separation distance may be about twice...

20060024054 - Optical transmission system including a plurality of optical transmission devices: Two multiplexing/demultiplexing sections of working and protection sides are prepared for each of a plurality of optical transmission devices which constitute a system, and the optical transmission devices are synchronized with each other to execute switching between the working and protection sides so that one of the working and protection...

20060024055 - Optical lan device and method for detecting abnormality in optical lan device: An optical LAN includes a master node, a plurality of slave nodes, and a plurality of optical fiber cables to configure a network. Each node transmits optical signals to the network and receives optical signals from the network. Each node includes: a light transmitting portion for transmitting optical signals to...

20060024056 - Real time fiber optic matrix switch interconnection: A real time fiber optic matrix switch includes at least one matrix switch port and a controller card. The controller card is configured to recognize communication protocols associated with any of the Type A-H and J signals of the Naval Tactical Data System (NTDS), and to enable the communication of...

20060024057 - Transient-based channel growth for optical transmission systems: A channel-growth plan for an optical transmission system selects channels such that the transients that result in the channels that survive a network failure, such as an upstream fiber cut, are either minimized or effectively handled by some transient-control technique. In one embodiment, the growth plan may try to keep...

20060024058 - Wdm optical transmission equipment with redundant configuration, and wavelength control method of light output in standby system: WDM optical transmission equipment with redundant configuration includes a plurality of transmitters. Each transmitter includes active and standby panels including active and standby optical transmission circuits respectively having active and standby attenuators for controlling an attenuation amount of each output of the active and standby optical transmission circuits; and a...

20060024059 - Bi-directional optical add-drop multiplexer: A bi-directional optical add-drop multiplexer is disclosed. The multiplexer includes at least two couples of optical elements including a wavelength division multiplexer and an optical circulator. Each of the wavelength division multiplexer demultiplexes one of a first WDM optical signal and a second WDM optical signal transmitted in opposite directions...

20060024060 - Apparatus and method for optical interconnects on a carrier substrate: Numerous embodiments are described of an apparatus and method for line-of-sight, optical signal channel propagating in free-space for interconnectivity between semiconductor packages on a carrier substrate. In one embodiment, a first semiconductor package and a second semiconductor package are coupled to the carrier substrate. A free-space, line-of-sight optical signaling channel...

20060024061 - Wavefront sensing system employing active updating of reference positions and subaperture locations on wavefront sensor: A free-space adaptive optical laser communication system having signal transmission and reception channels at all terminals in the communication system, wherein wavefront sensing (WFS) and wavefront correction mechanisms are employed along signal transmission and reception channels of all terminals in the communication system (i.e. adaptive optics) to improve the condition...

20060024062 - Pre-compensation for modulator distortion in optical systems: System, method, and computer program product for accessing values from a multi-port memory having a plurality of read ports, each value representing a modulator distortion compensation value associated with a modulator of an optical device, and processing an input signal using the accessed values to generate an output signal that...

20060024063 - Optical amplifier and optical monitor circuit: An optical amplifier of the present invention comprises: an optical amplifying circuit which amplifies a signal light; an optical reflection medium which is disposed on an optical fiber connected to the optical amplifying circuit and is capable of reflecting a noise light which exists in a predetermined wavelength range outside...

20060024064 - Method for transmitting data signals and additional signals in an optical network: The transmission of a data signal (DS) in the form of data packets takes place by means of angular modulation, preferably two or three stage difference phase modulation. The header (HEAD) is transmitted by means of polarization modulation. An additional channel formed in this way is also available for the...

20060024065 - All-optical signal processing method and device: A device for processing of an optical input signal includes at least a first data signal. A first optical resonator provides a reference signal by optical filtering of the optical input signal. The first optical resonator is matched with a predetermined reference wavelength of the first data signal. A second...

20060024067 - Optical i/o chip for use with distinct electronic chip: Generally, an embodiment of the present invention provides an optical input/output (I/O) chip that is fabricated separately and distinctly from an electrical integrated circuit chip having core circuitry thereon. The electronic and optical I/O chips are later electrically connected (e.g., using packing technology) to form a hybrid optical-electronic chip system...

20060024066 - Optical modulating device: An optical modulation apparatus is provided which implements a stable amplifying function by reducing the effect of reflected light rays form end faces of a bidirectional optical amplifier by imposing a numerical limitation on the relationship between the gain of the bidirectional optical amplifier and the loss of the optical...

20060024068 - Light output control circuit: Using a switching signal from a coarse/fine switching and operation mode switching circuit, the width of change of a counter control value during power up is increased, and the width of change is reduced once a steady state is reached. In the steady state, the frequency of updating is limited...

20060024069 - Digital synthesis of readily compensated optical signals: A method and system for mitigating effects of dispersion in an optical link. A pair of digital sample streams are synthesized representing a target optical E-field having a spectrum selected such that the convolution of the spectrum with itself yields a signal having beat terms that contain phase information of...