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7409163 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...
7406267 Method and apparatus for transmitting a signal using thermal chirp management of a directly modulated transmitter  
A fiber optic transmitter comprising a digital driver adapted to adjust the crossing point of a digital base signal, an optical source adapted to receive the digital base signal and produce a...
7398023 Method and apparatus for bias and alignment control in an optical signal transmitter  
A method and apparatus for controlling bias and alignment in an optical signal transmitter for providing intensity modulation and DPSK modulation to an optical signal, e.g. in an RZ-DPSK modulation...
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...
7394992 Control of an optical modulator for desired biasing of data and pulse modulators  
In an optical transmitter, continuous wave light from a laser passes through a data modulator (DM) for non-return-to-zero (NRZ) encoding of a data stream and through a pulse modulator to add...
7389053 Tunable filtering of RF or microwave signals based on optical filtering in Mach-Zehnder configuration  
Devices and techniques for achieving signal filtering in RF or microwave frequencies by optical filtering using two separate optical paths. Each optical path may include one or more optical...
7376358 Location specific optical monitoring  
An optical spike is generated at an arbitrarily selected location within an arbitrary optical link. The optical spike is generated by deriving a spike signal having a plurality of components, and...
7376352 Chirp managed laser fiber optic system including an adaptive receiver  
A fiber optic communication system comprising: an optical signal source adapted to produce a frequency modulated signal; and an optical spectrum reshaper (OSR) adapted to convert the...
7369780 Remodulating channel selectors for WDM optical communication systems  
The present invention provides a remodulating channel selector for a wavelength division multiplexed optical communication system. The remodulating selector receives a WDM input signal, selects a...
7366424 Methods and apparatus for producing transmission failure protected, bridged, and dispersion resistant signals  
Apparatus for creating a communication signal, comprising a modulator adapted to: modulate a first and a second beam of continuous wave electromagnetic radiation with a source signal, assemble...
7362978 Duobinary optical transmission apparatus  
Disclosed is a duobinary optical transmission apparatus. The duobinary optical transmission apparatus uses the crossed phase characteristics of a duobinary signal without using a feedback-type...
7352968 Chirped managed, wavelength multiplexed, directly modulated sources using an arrayed waveguide grating (AWG) as multi-wavelength discriminator  
There is provided a fiber optic system comprising: a multi-wavelength source adapted to generate frequency modulated signals having different wavelengths, λ 1 , λ 2 , . . . , λ n ; and an...
7349636 Optical phase and intensity modulation with improved transmitters  
An apparatus for transmitting at least a digital optical signal with a simultaneous modulation of the amplitude and the phase, the said encoded optical signal having improved spectral efficiency...
7346283 Method and apparatus for CRZ-DQPSK optical signal generation  
Apparatus and methods for generating chirped return-to-zero (CRZ) differential quadrature phase-shift keyed (DQPSK) optical signals using a single modulator driven by synchronous return-to-zero...
7340168 System and method for optically labeled packet transmission  
A system and method for transmitting optically labeled packets using DPSK/ASK modulation. The system comprises a transmitter including at least two modulators adapted to provide DPSK modulation of...
7324761 Single sideband optical transmitter  
Described are an optical transmitter and a method for generating a single sideband optical signal. The method includes generating a data signal at a first power level and at a second power level...
7324760 Apparatus and method for phase synchronization control in RZ optical transmitter  
An optical RZ transmitter comprises an optical signal source and a pair of electro-optical modulators in tandem, one arranged to receive a NRZ electrical data signal and the other a clock signal at...
7324757 USB communication transceiver using optical link  
An optical version of USB is provided to enable PDAs and digital cameras to download data and media files to remote network servers. The PDA is plugged into an optical transceiver that communicates...
7317878 Quantum switch teleportation for two receivers  
A quantum switch teleportation system contains one pair of two-mode squeezed light source devices that generate a pair of two-mode squeezed lights, and two receiving devices. The user can switch or...
7317845 Optical modulator having reduced bandwidth requirements and method of operation thereof  
An optical modulator is overdriven to increase its nonlinearity and therefore improve its response as it pertains to differential phase shift keyed (DPSK) transmission and a method of operating the...
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...
7292792 High speed modulation of optical subcarriers  
A method for transmitting digital data includes splitting a coherent optical carrier having a subcarrier into mutually coherent optical carriers, producing corresponding sequences of phase shifts...
7277646 Duobinary optical transmitter  
An optical transmitter for generating an optical signal includes: a precoder for coding an electrical signal of binary data; a continuous-wave (CW) light source for generating a continuous wave...
7277645 High-bit-rate long-haul fiber optic communication system techniques and arrangements  
A 90 degree Alternate-Phase (AP) on-off keying (OOK) transmission format for high bit rate, long-haul optical transmission systems employing a chirped or a chirp-free pulse stream generated by a...
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...
7224906 Method and system for mitigating nonlinear transmission impairments in fiber-optic communications systems  
The present invention relates to a method for transmitting data. An optical pulse stream comprising a plurality of return-to-zero optical pulses is prepared by modulating a phase of light output by...
7200344 Receiver and method for a multichannel optical communication system  
A method and system for transmitting information in a wavelength division multiplex (WDM) or other suitable multichannel optical communication system includes receiving a multichannel signal having...
7200338 Method and system for communicating a clock signal over an optical link  
A method and system for communicating a clock signal over an optical link includes receiving a multimodulated optical information signal including non-intensity modulation for a data signal and...
7194211 Method and system for 80 and 160 gigabit-per-second QRZ transmission in 100 GHz optical bandwidth with enhanced receiver performance  
Optical transmitter/receivers for use in a DWDM systems are provided. Transmission of data signals in a quadrature-return-to-zero (QRZ) format achieves a data transmission rate equal to eight times...
7187821 Carrier suppression using adiabatic frequency modulation (AFM)  
A method and system for suppression of the optical carrier of an optically modulated digital signal, the method comprising the steps of: modulating the amplitude of an optical carrier with digital...
7174109 Method and apparatus for encoding optical power and non-payload data in an optical signal  
A method and apparatus for encoding optical power and non-payload data in an optical signal is described. The method involves producing a dither modulating signal having an amplitude of indicative...
7171129 Optical communication system using coherence multiplexing in an optical DWDM network  
The present invention comprises an optical communication system, including apparatuses and methods, which use coherence multiplexing to optically multiplex different signals that may have varying...
7164862 Transmitting an optical signal with corresponding WDM and TDM channels  
An optical signal transmitter is disclosed that transmits an optical signal with corresponding Wavelength Division Multiplexing (WDM) channels and Time Division Multiplexing (TDM) channels. The...
7149434 System and method for optical communication  
A system and method for optical communication is disclosed comprising a transmitter configured to transmit a signal wherein a first channel is in a USB spectrum but not in an LSB spectrum; and a...
7146109 Analog modulation of optical signals  
An optically modulated signal is generated for use in transporting data by generating a so-called sub-carrier modulated optical signal and, then, vector modulating the sub-carrier modulated optical...
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...
7136595 Optical transmitter, optical receiver, and manufacturing method of optical device  
An optical transmitter-receiver is provided which is suitable for a high-speed optical communication system. A high-frequency electric line on a mounting substrate becomes a traveling-wave...
7133622 Return-to-zero (RZ) optical data modulator  
A method and apparatus for variable duty cycle generation of optical RZ data signals uses a single, NRZ-driven phase modulator followed by a optical delay-line interferometer. If desired, a...
7133621 Optical communication with phase encoding and phase shifting  
A communication system comprises a phase encoder, a phase shifter, and a modulator. The phase encoder receives user data and phase encodes the user data to form an encoded signal representing the...
7127182 Efficient optical transmission system  
A transmitter for optical communication systems includes a source of optical radiation, a source of complex non-information signals, and a modulator unit in communication with the source of optical...
7116917 Optical transmitter and optical transmission system  
The present invention suppresses to a minimum the degradation of the transmission quality caused by chromatic dispersion characteristic of an optical transmission medium, and the interplay between...
7103285 Optical transmission system for reducing nonlinear optical phenomena using modulation depth control system  
An optical transmitter enables output of high-power light signals while effectively suppressing occurrence of the nonlinear optical phenomena, particularly, SBS, and an optical communication system...
7103279 Architecture for wireless transmission of high rate optical signals  
An apparatus for a wireless transmission of high data rate signals such as received from an optical interface including gigabit fiber channel or a sonet. The architecture combines direct detection...
7099592 Telecommunications card for secure optical data transmission and installation method  
A card for transmitting data over at least one optical fiber includes a transmitter having at least one light source and a phase modulator for phase modulating light from the source so as to create...
7088518 Bidirectional optical device  
A multiband wavelength multiplexed optical device for bidirectional communication over one light path. The device may use dichroic filters or reflectors, or other mechanisms for wavelength or...
7085500 Programmable optical vector modulator and method for use in coherent optical communications  
A transmitter comprising a programmable optical vector modulator and method for coherent optical signal communication. The transmitter includes a transmitter laser whose output is coupled by way of...
7076169 System and method for orthogonal frequency division multiplexed optical communication  
A system for optical communication send optical signals over a plurality of wavelength channels. Each wavelength channel comprises a number of orthogonal subchannel frequencies which are spaced...
7068948 Generation of optical signals with return-to-zero format  
An optical return-to-zero (RZ) signal generator and related methods are described in which a phase modulator causes a phase change in an optical signal responsive to a transition in a driving...
7062172 Optical transmission system for frequency-multiplexed signal  
A detector outputs a detection signal indicating amplitude variation of an input frequency-multiplexed signal. An amplitude controller adjusts the amplitude of the frequency-multiplexed signal by...
7035543 Method and system for demultiplexing non-intensity modulated wavelength division multiplexed (WDM) signals  
A method and system for demultiplexing non-intensity modulated wavelength division multiplexed (WDM) signals includes receiving a WDM signal having a plurality of non-intensity modulated optical...
Matches 1 - 50 out of 158 1 2 3 4 >