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7616899 Synchronizing method in optical access network, optical switching device, center device, and remote device  
To provide synchronizing methods, optical switch modules, center devices, remote devices, optical access systems, optical access networks, programs, and recording media in the optical access...
7613399 Optical transmission system, optical transmitter, and optical receiver  
In order to improve a transmission speed of multilevel light transmission, increasing the number of light emitting elements is effective. However, in a method in which light outputs from a...
7606503 Pulse signal demodulation device  
In an optical transmission system in which a pulse signal is converted into an optical signal before transmission, a pulse signal demodulation device capable of correctly demodulating the pulse...
7606498 Carrier recovery in a coherent optical receiver  
A method of carrier recovery from a high speed optical signal received through an optical communications network. A stream of multi-bit digital samples of the optical signal is processed to...
7606487 Distortion measurement in optical communication systems  
The distortion component of an optical signal received from an optical transmission system, such as an all-optical system, subject to noise and amplitude distortion components, can be evaluated by...
7603040 Chip to chip optic alleys and method  
A data link includes an ASIC. The data link includes a heat insulation layer in contact with the ASIC. The data link includes an optical transducer layer having a plurality of transducers, with...
7593644 Synchronization of lasers and RF sources using timing information transfer in the optical domain  
A RF-synchronization system includes a laser that creates pulse trains for synchronization. A modulation means transfers the timing information of the pulse train into an amplitude modulation of an...
7589303 Method of determining and/or evaluating a differential optical signal  
The invention relates to a method for determining and/or evaluating a differential, optical signal. According to the invention, at least two first light sources (S 1 , S 2 ) which are sequentially...
7577370 Method and apparatus for extracting optical clock signal  
An apparatus and method for extracting an optical clock signal are provided. The apparatus includes a first reflection filter selecting and reflecting only a first frequency component in an input...
7577328 Optical reflector, optical system and optical multiplexer/demultiplexer device  
An optical reflector, an optical multiplexer/demultiplexer device and an optical system which can allow more flexible arrangement of an optical filter thereof, and enhance performance of wavelength...
7574142 Communications system  
In a telecommunication system, channels of information are modulated onto respective carriers that are swept repeatedly across a frequency range in a time-staggered fashion so that, at any one time...
7567758 Transceiver module and integrated circuit with multi-rate eye openers and bypass  
A transceiver module having intergrated eye diagram opening functionality for reducing jitter is describe. The transceiver module may transmitter eye opener and a receiver eye opener integrated in...
7561806 Method and system for keeping timing alignment between driving signals in optical double modulation  
A method and system is disclosed for making timing alignment for a data transmission system, the method comprising providing a reference clock signal with a first frequency to a multiplexer through...
7546040 Fiber optical system for PMD mitigation by polarization scrambling  
A fiber optical system ( 10 ) for transmitting an optical signal comprises an optical fiber line ( 1 ) with a plurality of successively arranged polarization scramblers ( 6 a to 6 c ) for...
7536109 Optical network system and device, and method for controlling optical network and device  
When entering an idling state, a master unit M transmits an optical signal for polling addressed to each slave unit S- 1 to S-n. The slave unit S-n located at the lowest rank of a direct chain...
7522841 Efficient data transmission and training of data processing functions  
A method of a conveying data through an optical communications system. An optical signal is received through the optical communication system, the optical signal comprising data symbols and SYNC...
7519299 Optical signal regenerative repeater, optical gate control method, and optical signal regeneration method  
An optical signal regenerative repeater is provided including at least one first optical 3R repeater based on an optical communication signal pulse, regenerating the optical communication signal...
7515835 System, method and apparatus for clockless PPM optical communication  
A PPM transmitter includes an optical clock generator for generating equally-spaced optical pulses with a sampling period T; an encoder for transforming an incoming waveform U(t) into a linear...
7489864 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...
7486898 Receiver for PMD mitigation by polarization scrambling  
A receiver ( 10 ) for an optical signal containing a time jitter and a time-varying distortion caused by a periodic polarization scrambled signal comprises at least one decision gate ( 11 ) and a...
7486894 Transceiver module and integrated circuit with dual eye openers  
A transceiver module having integrated eye diagram opening functionality for reducing jitter is described. The transceiver module may include a transmitter eye opener and a receiver eye opener...
7447443 Method and system for keeping time alignment between optical data modulation and a periodically modulated light source  
A method and system is disclosed for making time alignment for a data transmission system. A first reference clock signal is provided to a first multiplexer coupled to a data modulator through a...
7444085 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,...
7443843 Terminal relay device and relay method  
An apparatus has a cross connection circuit, first switching sections located on the input side of the cross connection circuit to switch a presently-used transmission path and a reserve...
7440702 Method for transmitting digital image signal, digital image transmitting device, digital image sending device and digital image receiver  
A multiplexer of a transmission section generates a clock signal by multiplying a reference clock signal of a digital image signal by a predetermined number ‘K’. A parallel digital image signal...
7440700 Apparatus for testing performance of optical transceiver  
Provided is an apparatus for testing the performance of an optical transceiver by referencing various performance clocks provided by an OTU2 signal connection transceiver and an STM-64/OC-192...
7437083 Wavelength converter  
A wavelength converter for binary optical signals includes an interferometer structure ( 110 ) for generating an output signal by modulating a received local signal (LS) according to the modulation...
7437082 Private optical communications systems, devices, and methods  
A method for transmitting traffic in an optical communication system comprising separating the input traffic into a plurality of data signals, parameter encoding the data signals, transmitting each...
7437081 System and method for providing two-way communication of quantum signals, timing signals, and public data  
A system and method for providing two-way communication of quantum signals, timing signals, and public data is provided. Generally, the system contains a first public data transceiver capable of...
7423564 Optical signal processing device for A/D converter including optical encoders with nonlinear loop mirrors  
An optically sampling device optically samples an optical analog signal using a sampled signal having a predetermined sampling frequency, and outputs control light having a pulse train of an...
7421212 Detecting and locating pulses using a Bragg cell  
Detecting a pulse of a signal includes receiving the signal and a light beam. The signal drives a spatial light modulator to modulate the light beam, where the complex amplitude of the modulated...
7418212 Electrical detection of optical symbols  
A system and method for detecting digital symbols carried in a received optical signal. The system comprises a functional element operative to receive a stream of samples of an electrical signal...
7409162 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...
7409157 Optical switch  
The present invention provides an optical switch in which a switching operation is not affected even when the polarization state of a control light varies. The optical switch includes a loop-form...
7398022 Optical return-to-zero phase-shift keying with improved transmitters  
An apparatus and a method for transmitting at least a digital optical signal with return-to-zero phase-shift keying, employing a single optical modulator with dual-drive design, the encoded optical...
7391975 Method of synchronizing servo timing in an optical wireless link  
A technique for synchronizing the servo control systems between two optical wireless links (OWLs) that are in communication with one another. This synchronization allows the alignment in time of...
7379672 Photonic RF distribution system  
The present photonic RF generation and distribution system provides a system and method for distributing an RF output signal. The photonic RF distribution system includes two optical sources for...
7376354 All optical clock recovery  
All optical clock recovery includes a transmitter for generating an optical timing signal. The transmitter includes a semiconductor laser for the production of a dynamically synchronizable timing...
7359396 Optical-core network with selective signal queueing  
A core network shared by a large number of edge nodes comprises core nodes interconnected by core channels. Selected core channels are provided with buffers to enable temporal alignment of signals...
7340186 Discrimination phase margin monitor circuit, transmitting/receiving device and communication system  
The discrimination phase margin monitor circuit ( 10 ) of the present invention comprises a first discrimination circuit ( 11 and 12 ) discriminating an input data signal using a clock signal...
7330661 Method and apparatus for optical communication between devices  
A method and apparatus for processing a data signal for transmission to a remote device transmits at least two synchronized copies of the data signal, in optical form, in different directions. To...
7304981 Apparatus and method of flywheel time-of-day (TOD) synchronization  
A wireless communications network including multiple nodes, and a local node having GPS-based time for synchronization of time-of-day (TOD) in the network. The network includes at least the local...
7302191 Optical transmitter with tap type optical filters  
An optical transmitter includes a continuous wave optical source for generating an optical signal having a carrier frequency component, a clock modulator for performing a clock modulation upon the...
7292793 Synchronous amplitude modulation for improved performance of optical transmission systems  
A method and apparatus is provided that yields improved performance of both single channel and WDM long-distance optical transmission systems by synchronously modulating of the transmitted signal's...
7292785 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...
7286567 Telecommunications system, and methods for transmitting data, and telecommunication system synchronization method  
Telecommunications systems can be synchronized via the transmission link. In this process, the telecommunication systems receive the clock signal and an additional information item, which describes...
7277643 Clock extracting fabric in a communication device  
A signal communication apparatus of a clock reproduction system in which clock signals are extracted from each of parallel data signals for redigitizing each of the data signals. The apparatus...
7266304 System for secure optical transmission of binary code  
An optical binary code transmission system comprising a sender comprising: means for generating a light beam; phase-shifter means; attenuator means whereby the intensity of the lateral modes is...
7260332 Asynchronous chirped systems, apparatuses, and methods  
An optical asynchronous chirp device having an input port and an output port, comprising first and second optical phase modulators optically connected in series between the input port and the...
7260330 Optical communication system using correlation receiver  
The present invention provides for a system and method for an optical communication system that utilizes an optical modulator as an optical correlator in a receiver. The present invention may be...
Matches 1 - 50 out of 372 1 2 3 4 5 6 7 8 >