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US20090304397 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...
US20090304396 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...
US20090297144 POLARIZATION MODE DISPERSION COMPENSATION IN MULTILEVEL CODED-MODULATION SCHEMES USING BLAST ALGORITHM AND ITERATIVE POLARIZATION CANCELLATION  
Receivers and methods are provided for polarization mode dispersion compensation in multi-level coded-modulation schemes using a BLAST algorithm and iterative polarization cancellation. A receiver...
US20090290869 VEHICLE-MOUNTED RECEIVER APPARATUS  
An in-vehicle receiving apparatus to receive transmitted data from an on-road device having a reference position setting device to set a position satisfying a predetermined reception condition, as...
US20090285581 Passive Optical Network Comprising an Optical Burst Mode Receiver  
A passive optical network is disclosed that enables burst mode operation without some of the disadvantages for doing so in the prior art. An embodiment of the present invention comprises a receiver...
US20090279894 TRIPLE WAVELENGTH BIDIRECTIONAL OPTICAL COMMUNICATION SYSTEM  
A triple wavelength bidirectional optical communication system includes an optical fiber, a transmitter optical subassembly and a receiver optical subassembly. The transmitter optical subassembly...
US20090269084 LIGHT RECEIVING CIRCUIT AND DIGITAL SYSTEM  
A light receiving circuit ( 114 ) includes a light inputting circuit ( 113 ) which converts one-system optical signal to be outputted from an optical transmission path ( 101 ) to an electrical...
US20090269076 SYSTEMS AND METHODS FOR OPTICAL RECEIVER DECISION THRESHOLD OPTIMIZATION  
The present invention provides systems and methods for a receiver threshold optimization loop to provide self-contained automatic adjustment in a compact module, such as a pluggable optical...
US20090269081 Soft Decision Threshold Control in a Signal Receiver Using Soft Decision Error Correction  
A soft decision threshold control system and method may be used with a forward error correction (FEC) scheme to adjust or tune one or more soft decision thresholds in response to one or more bit...
US20090257757 SIGNAL IDENTIFICATION IN OPTICAL COMMUNICATIONS NETWORKS  
Signals in an optical communications network, such as optical channels in an optical WDM network for example, are each identified by at least two low frequency dither tones with which the signal is...
US20090257756 Optical receiver and optical phase control method thereof  
An optical receiver includes: delay interferometers respectively provided in at least two branches that branch a reception signal; a phase shift amount control device that controls a phase shift...
US20090252504 Optical Receiver  
Provided is an optical receiver which has a wide dynamic range characteristic for stably reproducing packets having different light receiving levels, and which is superior in high-speed...
US20090245811 HIGH BANDWIDTH COMMUNICATION SYSTEM AND METHOD  
A communication system ( 20 ) includes a transmitter ( 22 ) with (i) a transmitter photonic crystal ( 30 ) having a waveguide ( 40 ) and multiple cavities ( 42, 44 , and 46 ) spaced along the...
US20090245807 OPTICAL POWER MONITORING CIRCUIT, OPTICAL TRANSCEIVER, OPTICAL MODULE, OPTICAL RECEIVER, AMPLIFIER CIRCUIT, AND INTEGRATED CIRCUIT  
Optical power monitoring capable of achieving a wide dynamic range and high-speed response is realized. An optical power monitoring circuit includes: a first amplifier (TIA 2 ) that amplifies an...
US20090238582 Optical receiver  
In an optical receiver, a light receiving element receives the optical packet signals and converts the optical packet signals to electrical signals. A bias voltage supply section supplies bias...
US20090238581 OPTICAL SIGNAL RECEIVING CIRCUIT  
To solve problematic trade-off between a bandwidth and a in-band deviation in an optical signal receiving circuit of a gigabit order that is required to have a wide dynamic range, the optical...
US20090232501 Adaptive Injection Current Controlled Burst Mode SOA for Long and Wide Reach High Speed PON  
An apparatus comprising an optical power splitter, an optical delay line coupled to the optical power splitter, an optical amplifier (OA) coupled to the optical delay line, and an adaptive...
US20090226187 Optical receiving apparatus and method  
An optical receiving apparatus compensates degradation of an optical signal received, based a division operation using the intensity of the optical signal. A receiving unit outputs a first...
US20090226186 OPTICAL PHASE-SHIFT-KEYING DEMODULATOR BIAS CONTROL METHOD  
The present invention provides a method for biasing/controlling an optical demodulator suitable for use in an optical phase-shift-keying (PSK) system, such as an optical...
US20090226188 BURST-MODE AUTOMATIC GAIN CONTROL CIRCUIT  
There is provided a burst-mode automatic gain control circuit capable of exerting gain control of a burst signal at high speed and stably. In the burst-mode ready digital automatic gain control...
US20090226165 APPARATUS AND METHOD OF CONTROLLING TAP COEFFICIENT OF TRANSVERSAL FILER, OPTICAL RECEIVER APPARATUS, AND OPTICAL COMMUNICATION SYSTEM  
An apparatus includes an oscillator circuit configured to generate a certain oscillation signal, an adder configured to add the oscillation signal to the tap coefficient of any of one or more taps...
US20090226189 COHERENT OPTICAL RECEIVER AND ADJUSTMENT METHOD THEREOF  
In a coherent optical receiver, a light intensity value of signal light providing an optimum reception state is determined when ideal signal light free from waveform distortion is used as the...
US20090220249 DEMODULATION CIRCUIT  
A demodulation circuit for reproducing transmitted data from a signal received by a receiver, the demodulation circuit includes a selector, converters and data recovery circuits. The selector...
US20090214226 OPTICAL DQPSK RECEIVER AND OPTICAL PHASE MONITOR APPARATUS FOR USE IN OPTICAL DQPSK RECEIVER  
First and second delay interferometers respectively have a phase-shift element. First and second photo detectors respectively detect optical signals output from the first and second delay...
US20090208227 OPTICAL APPARATUS AND USE METHOD THEREOF FOR PASSIVE OPTICAL NETWORK SYSTEM  
An optical apparatus receives an upward signal light from a plurality of subscriber units, where the upward signal light is composed of a plurality of time slots corresponding to the plurality of...
US20090208226 Bang-bang architecture  
In one embodiment, the present invention includes an apparatus having a voltage controlled oscillator (VCO) to generate a first clock signal having a frequency controlled by a bias current coupling...
US20090202249 PON (PASSIVE OPTICAL NETWORK) STATION SIDE APPARATUS, PON UPLINK LINE COMMUNICATION METHOD, AND PROGRAM RECORDING MEDIUM  
A PON station side apparatus is provided with a selection section and a receiving section. For multiple data transferred from multiple PON terminal apparatuses that transmit data at different...
US20090202259 Current mirror circuit and optical receiver circuit using the same  
A current mirror circuit and an optical receiver circuit implementing with the current mirror circuit are disclosed. The current mirror circuit provides two MOSFETs and two differential amplifiers....
US20090202258 Method for improving the performance of phase-modulated communication systems in an optical network  
A method and system for improving the performance of a differential-phase modulated optical communication system is disclosed. The system comprises a demodulator having a tunable element to adjust...
US20090196632 OPTICAL BURST RECEIVER AND METHOD  
The present invention allows a configuration with elements inside the LSI, the elimination of manpower by using automatic adjustment, a reduction in the manufacturing cost, and control of the duty...
US20090190926 Combined phase and polarization modulation for optical communication  
The invention relates to a modulation scheme for optical communication, in particular for fiber optics communication. According to invention, an optical signal is generated, both phase and...
US20090175623 OPTICAL SIGNAL DETECTOR  
An optical signal detector is provided that detects an optical signal from an optical source using a plurality of optical sensors having different wavelength selectivities, thereby determining the...
US20090154940 BALANCED OPTICAL SIGNAL PROCESSOR  
An apparatus and method for reducing electrical signal intermodulation by processing a balanced electrical signal in the optical domain in a manner adapted to reduce noise and second order...
US20090142075 DQPSK optical receiver  
According to an aspect of an embodiment, a DQPSK optical receiver, comprising: a first LPF connected to a line branching off from between a first optical-electrical converter and a first data...
US20090142074 OPTICAL RECEIVING APPARATUS, OPTICAL LINE TERMINAL APPARATUS, AND OPTICAL NETWORK SYSTEM  
The optical receiving apparatus of the present invention is provided with an optical receiving unit which receives a burst optical signal and outputs a signal in accordance with an optical...
US20090129781 OPTICAL COMMUNICATION APPARATUS, OPTICAL COMMUNICATION METHOD, AND OPTICAL COMMUNICATION SYSTEM  
Optical communication apparatuses capable of performing appropriate communication according to a distance to a receiving apparatus, optical communication methods, and an optical communication...
US20090116850 RESONANT QUANTUM WELL MODULATOR DRIVER  
A drive circuit and method of controlling a quantum well modulator are disclosed. The drive circuit can be disposed in an optical transceiver having a quantum well modulator configured to...
US20090103931 SYSTEMS AND METHODS FOR THE COHERENT NON-DIFFERENTIAL DETECTION OF OPTICAL COMMUNICATION SIGNALS  
In various exemplary embodiments, the present invention provides coherent non-differential detection systems and methods for the detection of optical communication signals by the Brillouin fiber...
US20090097865 METHOD AND SYSTEM FOR A NARROWBAND, NON-LINEAR OPTOELECTRONIC RECEIVER  
Methods and systems for a narrowband, non-linear optoelectronic receiver are disclosed and may include amplifying a received signal, limiting a bandwidth of the received signal, and restoring the...
US20090074426 MONOLITHIC DQPSK RECEIVER  
A monolithic, Indium Phosphide (InP) differential phase-shift keying (DPSK) or differential quadrature phase shift keying (DQPSK) receiver that exhibits low polarization sensitivity.
US20090067854 OPTICAL SPACE COMMUNICATION RECEPTION CIRCUIT, OPTICAL SPACE COMMUNICATION DEVICE, OPTICAL SPACE COMMUNICATION SYSTEM, AND ELECTRONIC DEVICE  
An optical space communication reception circuit receives a signal in switched-over communication speed modes and under settings corresponding to the communication speed modes. Receiver sensitivity...
US20090052907 WAVELENGTH TRANSMISSION SYSTEM AND METHOD USING 3-DIMENSIONAL LDPC-CODED MODULATION  
A transmitter and method include a LDPC encoder configured to encode source data, and a mapper configured to generate three coordinates in accordance with a 3 D signal constellation where the...
US20090041477 ATTENUATION SYSTEMS AND METHODS FOR USE WITH AN OPTICAL DETECTOR IN AN OPTICAL COMMUNICATION SYSTEM  
Systems and methods for use with an optical communication beam are disclosed. The system allows the beam of light to operate at an adequate power level that provides a robust optical link while...
US20090041476 METHOD AND APPARATUS FOR PROCESSING SIGNALS OF PHOTO-DETECTOR IN VISIBLE LIGHT COMMUNICATION SYSTEM  
Disclosed is a method for processing incoming signals of photo-detectors in a visible light communication system. The method includes: dividing symbol duration into divided durations according to...
US20090028580 Optical reception apparatus and controlling method thereof  
The optical reception apparatus of the invention branches into two an RZ-DQPSK optical signal input from an optical transmission path via an optical amplifier, respectively sends this to delay...
US20090022498 OPTICAL TRANSMISSION SYSTEM  
In the transmitting apparatus, phase modulation means phase-modulates a signal light from a signal source based on data. Polarization modulation means polarization-modulates the signal light which...
US20090022502 Receiving apparatus  
A receiving apparatus which suppresses threshold-voltage changes. A peak voltage detection block detects the peak voltage of a signal. A bottom voltage detection block detects the bottom voltage of...
US20090003844 HIGH SPEED OPTOELECTRONIC RECEIVER  
A novel 100+ Gbit/s opto-electronic receiver uses hybrid integration of a photodiode and a demultiplexer. The photodiode converts a high speed optical data stream to an electrical data stream that...
US20090004995 CASE SUBSTRATE  
A case substrate including a base material and a coating layer coated on the base material. The coating layer has a hollow-out opening corresponding to the position of an infrared receiver, such...
US20080317477 LASER RANGEFINDER AND METHOD FOR DIGITAL SIGNAL PROCESSING THEREOF  
A method for digital signal processing is disclosed. Reflected laser signals are received and digitized to generate corresponding digital signals. The digital signals are accumulated to generate an...
Matches 1 - 50 out of 98 1 2 >