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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...
7254185 Method for recovering a digital data content in a communication system and apparatus for performing the same  
A method is directed to recovering a digital data content in a communication system, wherein the digital data content has been converted into an analog signal based on a primary clock, at a...
7248802 Distribution of a synchronization signal in an optical communication system  
The invention relates to the distribution of a synchronization signal in an optical communication system which is inherently asynchronous. In order to accomplish a cost-efficient mechanism for...
7242868 System and method for performing high-speed communications over fiber optical networks  
Processing a received optical signal in an optical communication network includes equalizing a received optical signal to provide an equalized signal, demodulating the equalized signal according to...
7239813 Bit synchronization circuit and central terminal for PON systems  
A bit synchronization circuit composed of a multiphase data sampling unit for converting each received burst data sets to multiphase data trains, a phase determination unit for generating a control...
7228075 Wavelength multiplexing apparatus and signal conversion apparatus  
The present invention relates to a wavelength multiplexing apparatus for multiplexing and/or demultiplexing a plurality of optical signals in the wavelength region and a signal conversion apparatus...
7221876 Method of optically producing clock and apparatus thereof  
Disclosed herein is a method of optically producing a clock, in which clock components are extracted from the spectrum of a transmitted optical signal and the influence of noise and jitter on the...
7212744 Receiver circuit and transmitter circuit  
The invention provides a transceiver circuit for communication that enhances the operation frequency of a synchronous digital circuit up to the maximum frequency of a flip-flop and inhibits the...
7197249 Method and system for synchronizing optical clocks  
A method and system for synchronizing a local optical clock with a master optical clock, wherein the local clock generates a local clock signal at a local clock wavelength, and said master clock...
7187869 Method for adjusting time delays and device for synchronization of channels in a WDM system  
The invention is also related to devices for a synchronization of data in an optical WDM transmission system, consisting of the following parts: A wavelength demultiplexer ( 1 ) for demultiplexing...
7174098 Apparatus and method for monitoring optical signal  
This invention provides a technique for realizing low-cost optical signal waveform monitoring with improved realtimeness to be applied to signal quality monitoring in an actual optical transmission...
7158727 10 Gbit/sec transmit structure with programmable clock delays  
The present invention provides a robust solution to the task of re-aligning data at the transmit end of a fiber optic or other high performance serial link, and also offers flexibility in the...
7155128 Decorrelation of WDM signals  
A method and system for reducing non-linear signal degradation effects of WDM optical signals exacerbated by highly correlated bit patterns of optical waveforms in neighboring optical channels....
7155121 Method and apparatus for providing controlled impairments to an optical transport system  
An optical stream is split into a primary optical stream and a secondary optical stream. The secondary optical stream is converted to an electrical signal. The electrical signal is processed to...
7155127 Optical communication system, optical communication unit, and optical transceiving package  
Cost-reduction in an optical communication unit is achieved by using spectrum-sliced modulated broadband light for transmitting upstream signals, instead of using laser light. An optical...
7142787 Optical data transmission method and its system, optical transmitter and its method, and optical switcher  
This invention discloses a method to easily extract a header from an optical packet. An optical data transmission method to transmit an optical packet composed of a header and data containing steps...
7139481 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...
7139475 Ring type fiber optic protection  
An optical receiver is provided with inputs for receiving two fiber optic lines. The two fiber optic lines carry redundant data. An optical interface passes the respective signals therein to a...
7136593 Wavelength-division multiplexed optical transmission system  
A wavelength-division multiplexed optical transmission system to keep the correlation of data patterns among wavelength channels to the low level, preventing large XPM and XGM from occurring when...
7120205 Method and system for multiple-shift code acquisition of optical orthogonal codes in optical CDMA systems  
A technique for determining an arbitrary delay in a source code word propagated over a channel that introduces the arbitrary delay in the source code word to produce a received code word. The...
7103282 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...
7103281 Communications network  
A device and method for correcting for timing jitter of an optical data pulse in an optical transmission system. During transmission, a data pulse may suffer jitter. Its arrival time at a node may...
7099582 Method and apparatus for multi-protocol and multi-rate optical channel performance monitoring  
A method and apparatus for optical performance monitoring that provides for multi-rate and multi-protocol monitoring includes, identifying a protocol associated with each of a plurality of...
7099593 Self-synchronization of an optical packet network using seed pulses extracted from within the packets  
A method and system for self-synchronizing an optical packet network by selecting a seed pulse from among the data pulses within a packet having no synchronization marker, transforming the seed...
7092639 EMI shield for reducing clock jitter of a transceiver  
A transmitter comprises an oscillator, a phase lock loop, a serializer, and an electrical-to-optical converter. The oscillator is enclosed in a metal shield. The metal shield is soldered to a...
7092641 Method and apparatus for optical transmission of wavelength-encoded modulation formats  
A system that transmits amplitude modulated data in a wavelength-encoded format and then uses a wavelength-sensitive receiver to convert the received optical signal back to the original amplitude...
7088491 Pulse generating apparatus and method  
An apparatus and method generating an optical pulse of picosecond class (having a high duty ratio), which accurately and stably operates at an arbitrary repetition frequency, has a high OSNR, and...
7076261 Synchronization of optical signaling beacons  
An arbitrary number of signaling beacons are synchronized simultaneously and automatically by a received modulated control signal in accordance with an arbitrary communication protocol over a...
7068950 Correcting misalignment between data and a carrier signal in transmitters  
A device and technique for aligning an optical carrier signal (e.g., a soliton pulse train) with a data signal in a transmitter. According to the invention, the device is configured to analyze the...
7058312 Opto-electronic phase-locked loop with microwave mixing for clock recovery  
A clock recovery circuit for synchronizing a clock signal having frequency of approximately f 0 with an optical data signal having a frequency of N×f 0 , where N is an arbitrary rational number,...
7039323 Optical transmitter for transmitting a plurality of output signals  
An optical transmitter for transmitting a first output data signal and a second output data signal, the optical transmitter comprising: a phase-locked-loop, the phase-locked-loop operable to...
7039849 Data decoder and method of decoding data  
A detecting circuit detects a boundary in a bit stream which is coded in compliance with a predetermined rule. The boundary is a point at which discontinuity of reproduction time occurs. An...
7031615 Optical channel selection and evaluation system  
A system and method of selecting and viewing communication traffic transmitted over an optical channel selected from among a plurality of possible channels without disrupting the communication...
7031616 Monitoring unit for optical burst mode signals  
The invention has for its object to provide a monitoring unit, particularly for optical burst mode signals in asynchronous optical networks based on, e.g., Internet or ATM (ATM=asynchronous...
7027741 Phase lock loop circuit and optical repeating apparatus, optical terminal apparatus, and optical communication system having the same  
According to a PLL circuit of the present invention, an output of a phase comparator is adjusted according to a space-to-mark transition-probability of an input signal so that an output of a...
7024121 Optical clock signal distribution system in WDM network  
Proposed is an optical clock distribution system in the WDM network, which particularly relates to a system to control clock synchronization between optical transmission devices constituting an...
7020401 Transponder and wavelength division-multiplexing optical transmission equipment  
A wavelength converter and a wavelength division-multiplexing optical communication apparatus automatically generate clock signals of a specified frequency that match send/receive digital signals...
7020397 Optical retiming of an optical data signal  
An optical retimer is provided that retimes an optical data signal entirely in the optical domain, thus eliminating the need for optical-to-electrical and electrical-to-optical converters, which...
7010234 All-optical regenerator for retiming, reshaping and retransmitting an optical signal  
An all-optical 3R regenerator (AO3R) and a method for using the AO3R to retime, reshape and retransmit an optical signal are described herein. The AO3R includes a polarizer that receives an input...
7010232 Removable optical interface modules  
An optical line interface assembly for insertion in a slot of a communications equipment rack includes a board having serial interfaces formed to couple to optical interface modules. The interface...
6996344 Fiber optic video transmitter and receiver system  
A video transmission system, for sending uncompressed digital video signals from an originating device such as a digital video camera to a distant location, such as a studio or editing facility and...
6990123 Method and apparatus for redundant transmission over TDMA optical networks  
Communication between a burst manager and plural remote terminals over a first passive optical network (PON) and a second PON, with each PON having a downstream portion and an upstream portion,...
6980746 Electronic RZ/CSRZ signal generation for optical communication systems  
A method and system for generating both return-to-zero (RZ) and carrier suppressed return-to-zero (CSRZ) shaped signals using only a single optical modulator. The system includes: a switch for...
6980748 SiGe or germanium flip chip optical receiver  
A synchronized optical clocking signal is provided to a plurality of optical receivers by providing a layer of a high absorption coefficient material, such as SiGe or Ge, on a front surface of a...
6977966 Bidirectional optical communications having quick data recovery without first establishing timing and phase lock  
A method of transmitting and rapidly recovering a burst of data without first having to establish a timing or phase lock. The signals are transmitted as modified Manchester coded signals having...
6970480 Protection switching for duplex ATM-PON systems  
A terminal device is provided for communicating data signals with a central communication device via a first signal carrying line and a second signal carrying line. The first signal carrying line...
6963697 Increased transmission capacity for a fiber-optic link  
A method of decoding a signal in an optical fiber. In one embodiment the method includes receiving the optical signal, wherein the optical signal is a pulse amplitude modulated signal. Converting...
6956682 Method for designing progressive addition lenses  
The invention provides a method for designing progressive surfaces and lenses produced using image blur to construct a merit function. The shape of a lens surface, or surfaces, is arbitrarily...
Matches 51 - 100 out of 375 < 1 2 3 4 5 6 7 8 >