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US20140126913 MODULATING APPARATUS  
A modulating apparatus includes a branch that branches input light; a first modulating unit that modulates the phase of a first branch obtained by the branch; a second modulating unit that...
US20150244468 OPTIMUM MODULATOR BIAS SYSTEMS AND METHODS IN COHERENT OPTICAL TRANSMITTERS  
A modulator bias selection method, a coherent optical transmitter, and optical modulator solve the problem of generating a correct constellation using the bias points with the minimum phase...
US20140119745 OPTICAL MODULATING APPARATUS AND OPTICAL TRANSMITTER  
An optical modulating apparatus includes driver that is mounted on a printed circuit board such that a signal electrode pad and a ground electrode pad of the driver are exposed in an opening of...
US20150043918 Double Capacity Pluggable Optics  
The methods, systems, and apparatuses described in this disclosure enable the use of pluggable optics such that two outgoing connections or two incoming connections can support the use of dual...
US20060210283 TRANSMITTERS FOR INVERSELY DISPERSED OPTICAL SIGNALS  
Transmitters for generating inversely dispersed optical signals to counter chromatic dispersion in optical fibers carrying the optical signals are presented. The transmitters have optical pulse...
US20090092401 Quaternary phase modulator  
In a quaternary phase modulator including two phase modulators disposed in parallel and a phase adjuster that adjusts a phase difference when the outputs of the two phase modulators are combined,...
US20100297589 DEVICE ARRANGED FOR ILLUMINATE AN AREA  
A device arranged to illuminate an area. The device includes a light source arranged to transmit a light lobe coded with information, and having a predetermined solid angle defining the width of...
US20080199189 COLORLESS OPTICAL DEMODULATOR FOR DIFFERENTIAL QUADRATURE PHASE SHIFT KEYING DWDM SYSTEMS  
A colorless optical DQPSK demodulator and system operating over multiple, equally-spaced DWDM channels with fixed optical delays—capable of demodulating DQPSK within signals within DWDM...
US20080232815 Dpsk Modulation-Demodulation Method, and Optical Communication Device and Optical Communication System Using the Same  
In the optical communication device and the optical communication system using DPSK modulation whose cost is low, whose size is small and whose power consumption is low, the N:1 multiplexer 125...
US20090110408 Laser Optical Transmission System with Dual Modulation  
An optical transmitter for generating a modulated optical signal for transmission over dispersive fiber optic links in which a first information-containing radio frequency signal input is applied...
US20130188969 METHOD AND SYSTEM FOR MULTIPLE RESONANCE INTERFEROMETER  
A multiple resonance interferometer structure includes an input port and a first arm coupled to the input port and including a first resonant structure. The multiple resonance interferometer also...
US20090041473 Optical device, optical modulation method, and optical transmitter  
An optical modulation device including waveform shapers that waveform-shape input data signals in synchronism with a rising or falling timing based on comparison with a reference level of an input...
US20070122161 Fiber optical transmission system, transmitter and receiver for DQPSK modulated signals and method for stabilizing the same  
A transmitter (3) for generating a DQPSK-modulated optical signal, comprising: a splitter (7) for dividing an optical carrier signal into a first and second branch (8a, 8b), a first and second...
US20100021182 OPTICAL TRANSMITTER  
An optical transmitter includes a modulation unit, an optical coupler, a photodetector and a control unit. The modulation unit sets up a phase difference between first and second optical signals...
US20140334828 PRE-EQUALIZATION USING PHASE CORRECTION  
An optical transmitter determines the transfer function in the reference-based pre-equalization for applying to an optically modulated signal at the transmitter. The determined pre-equalization...
US20080240728 Electrical generation of return-to-zero (RZ) data pattern with flexible duty cycle adjustment for optical transmission  
An electrical return to zero (RZ) encoder converts non-return to zero (NRZ) data, into of RZ data patterns with a flexibility for duty cycle adjustment so that any RZ data pattern may be provided...
US20080181618 Modulating A Signal According To 2n-PSK Modulation  
A system operable to modulate a signal according to phase-shift keying (PSK) modulation includes a translator and a phase modulation system. The translator receives data signals and translates the...
US20070047967 Method and arrangement for demodulating an optical DPSK binary signal  
An optical differentially phase shift keyed or DPSK binary signal which in the event of phase changes exhibits amplitude reductions and is phase-demodulated is provided. The received optical DPSK...
US20060193640 Optical signal reception device  
An optical signal reception device is disclosed that receives and demodulates an optical signal modulated by DQPSK and performs logical inversion and other controls to transit to the object...
US20050053385 Optical apparatus and optical processing method  
A first semiconductor optical amplifier is disposed on a first arm of a Mach-Zehnder interferometer and a second semiconductor optical amplifier is disposed on a second arm. An optical splitter...
US20070140704 Optical transmitter with enhanced SBS threshold power capability  
An optical transmitter (8) having enhanced stimulated Brillouin scattering (SBS) threshold power (PSBS) capability is disclosed. The transmitter includes a light source (12) adapted to emit a...
US20060159466 Offset quadrature phase-shift-keying method and optical transmitter using the same  
Disclosed is an optical transmitter using an offset quadrature phase-shift-keying (OQPSK) method. The method includes: a first phase modulator for outputting a first signal beam generated by...
US20050111855 Modified DPSK transmission system  
The invention describes a transmission system with transmitter, transmission line and receiver, where the transmitted signal is modulated by a diffential phase shift keying modulation scheme. This...
US20070212077 Ultra Wideband Communication System, Transmission Device Reception Device, and Replay Device Used for the Same  
The ultra wideband communication system comprises: a pulse generation section for generating a pulse signal based on a data signal; a first optical phase modulation section for performing optical...
US20090116849 DQPSK modulation apparatus and DQPSK modulation method  
An optical transmitting apparatus includes a branching unit that branches light output from a light source into light beams, a phase control unit and an ABC circuit that control the phase of one...
US20120082468 LOOK-UP TABLE AND DIGITAL TRANSMITTER BASED ARCHITECTURE FOR FIBER NONLINEARITY COMPENSATION  
Systems and methods are disclosed to process an optical signal with a pre-processing module to populate a non-linearity compensation look-up table based on a set of predetermined rules in a...
US20090269080 OPTICAL TRANSMITTING APPARATUS  
An optical transmitting apparatus includes a modulating unit that branches an input light and performs independent phase modulation to branched optical signals of arms, a phase adjusting unit that...
US20100080571 OPTICAL SIGNAL TRANSMITTER  
An optical signal transmitter includes first and second modulation units, a combiner, and a control unit. The first and second modulation units generate first and second modulated optical signals,...
US20070036555 Coherent phase-shift-keying  
A receiver for coherent detection of a PSK modulated optical carrier includes an optical detector, digital-to-analog converters, and a digital module. The optical detector is configured to mix the...
US20120263468 Generation of Optical Quadrature Duobinary Format Using Optical Delay  
An optical method for generating an optical quadrature duobinary QDB signal includes receiving a quadrature phase-shift-keying QPSK signal, and adding a delay to the received quadrature...
US20070223938 Rate adjustable differential phase shift key (DPSK) modulation  
In a fixed delay optical communication system, rate adjustable differential phase shift key (DPSK) techniques eliminate the need for multiple comparing modules, each corresponding to a different...
US20150222365 OPTICAL TRANSMITTER AND BIAS VOLTAGE CONTROL METHOD  
An optical transmitter includes: optical modulation means; bias voltage output means for supplying the optical modulation means with a bias voltage on which a pilot signal is superimposed; pilot...
US20080112710 DIFFERENTIAL M PHASE-SHIFT MODULATOR  
The present invention is a miniaturized differential M phase-shift modulator (M=2n: n is 2 or more) in which a plurality of Mach-Zehnder type light modulators each adapted to output a...
US20070098413 Optical logic element  
An optical logic element includes a first interferometer modulating a continuous optical signal in response to first and second optical signals to output a first modulation signal, and a second...
US20050069331 Return-to-zero optical transmission device  
Disclosed is a return-to-zero (RZ) optical transmission device. A light source outputs a carrier wave. A precoder encodes an inputted non-return-to-zero (NRZ) electrical signal. A delay element...
US20060045541 Asymmetric long-haul transmission paths with optical phase conjugation  
An apparatus includes a non-solitonic all-optical communication path having serially connected first and second segments. The first segment end-couples to a lumped optical transmitter. The second...
US20090226184 OPTICAL MODULATION DEVICE AND OPTICAL MODULATION METHOD  
An optical modulation device and method thereof is provided. The optical modulation device includes a decision circuit making a decision with respect to an input data signal in accordance with a...
US20070264029 Delay interferometer and demodulator  
A delay interferometer and a demodulator including the delay interferometer and a balanced photodetector are provided. A half mirror splits an optical signal into first and second split beams of...
US20050100346 Optical transmitter for use in high-density wavelength division multiplexing (WDM) optical transmission system  
An optical transmitter for use in high-density WDM (Wavelength Division Multiplexing) optical transmission system generates an RZ-AMI (Return to Zero—Alternate Mark Inversion) signal which...
US20080050124 OPTICAL SIGNAL PROCESSING CIRCUIT  
An optical phase modulation circuit includes an optical phase modulation element, an optical bandpass filter, and an optical directional coupler, wherein control light with a wavelength of λC is...
US20050260000 Optical receiver including a system and method of controlling gain of an optical amplifier  
A receiver for a differentially phase shift keying formatted optical signal, such as an RZ-DPSK formatted optical signal. Dither control loops are provided for controlling path length in a...
US20100046942 PHASE ESTIMATION FOR COHERENT OPTICAL DETECTION  
The present invention is a method and apparatus to make an estimate of the phase of a signal relative to the local oscillator in an optical coherent detection subsystem that employs a digital...
US20090136241 OPTICAL MSK DATA FORMAT  
A method of generating an optical minimum shift keying (MSK) modulated signal, a method of pre-coding an input data stream for generation of an optical MSK modulated signal, a method of decoding...
US20070110454 Communication system and timing control method  
A communication system and a timing control method are proposed that optimize timing in a sender and thereby enable information to be stably transmitted at the right timing. Under instructions...
US20080118246 Encoding and decoding architecture and method for pipelining encoded data or pipelining with a look-ahead strategy  
An encoding and/or decoding communication system comprises a framer interface, an encoder, a multiplexer, an output driver, and a clock multiplier unit (CMU). The encoder includes an input latch...
US20150063827 METHOD FOR MODULATING A CARRIER LIGHT WAVE  
Method for modulating a carrier light wave to achieve, a modulated light wave which carries information by symbols selected from a set of at least two different symbols. The light led through each...
US20110091221 METHOD AND SYSTEM FOR SETTING TIMING OF PHASE MODULATION OF xPSK TRANSMITTER  
A method is provided for setting a timing of phase modulation by a target phase modulator within an optical transmitter which performs 2n order phase shift keying, n being a natural number equal...
US20120051742 APPARATUS FOR SELF-PHASE MODULATION NOISE CALCULATION, APPARATUS FOR SELF-PHASE MODULATION NOISE ELIMINATION AND OPTICAL COHERENT RECEIVER  
The present invention provides apparatus for self-phase modulation noise calculation, apparatus for self-phase modulation noise elimination and optical coherent receiver. The apparatus for...
US20090304394 DELAY INTERFEROMETER  
In a delay interferometer in which a Michelson delay interferometer unit is mounted in a package, the delay interferometer includes a Michelson delay interferometer unit which outputs first...
US20140072313 OPTICAL TRANSMISSION APPARATUS  
A first clock modulator branches a light beam, varies a phase difference of the resulting light beams according to a first clock, and causes interference of the light beams. A second clock...

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