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8184991 Ditherless optical modulator control  
A method of controlling the operating parameters of an optical modulator, without using a dither signal, is provided. Past operating parameters are compared to present operating parameters using a...
8184988 Optical modulating device with frequency multiplying technique for electrical signals  
The present invention relates to an optical modulating device with frequency multiplying technique for electrical signals, which primary comprises a mixer, which generates a mixed data signal from...
8165476 Optical phase locked loop  
A single sideband modulator uses a radio-frequency signal output by a voltage controlled oscillator to modulate a reference optical signal output by a local light source, thereby obtaining several...
8160456 Bias controller for an optical modulator  
A bias controller for an optical modulator. The modulator includes a bias electrode that is operable when appropriately biased by an applied bias voltage to configure the modulator to operate at...
8160450 Transceiver for optical transmission and transmission method for the same  
The present invention provides a transceiver for optical transmission in which noise can be sufficiently suppressed and a method for the same using a simple configuration. The transceiver includes...
8145067 Optical transmitter  
An optical transmitter includes a light source that outputs light superposed with a pilot signal having a predetermined frequency; an optical modulating unit that modulates the light from the light...
8145069 Optical transmitter  
A signal Data1 and Data2 are output from a DQPSK signal source. The output signal is input to the modulator drivers 1 and 2 of the differential output. A drive signal is applied from the drivers 1...
8131155 Optical signal transmission apparatus  
There is provided an optical signal transmission apparatus having a stable dispersion compensation function without unnecessarily controlling a compensation value even when a main signal quality is...
8126337 Balanced phase-shaped binary transmission in optical communications  
Optical communication apparatus, methods, systems are provided based on balanced-detection phase-shaped binary transmission (BD-PSBT).
8116636 Transceiver and method for high-speed auto-compensating quantum cryptography  
Provided are an auto-compensating quantum cryptography transceiver and method of transmitting a quantum cryptography key at a high speed. A quantum cryptography transmitter includes a wavelength...
8116638 Radio frequency (RF) signal receiver using optical processing and associated methods  
A signal receiver, such as an RF-matched filter receiver, includes an optical source (e.g. a mode-locked laser) providing an optical signal, and a first optical modulator to modulate the optical...
8112003 Optical transmitter, operation controlling method for the same, and recording medium  
An optical transmitter according to an exemplary aspect of the present invention is an optical transmitter that includes a variable-wavelength light source and a modulator for modulating and...
8095018 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,...
8086110 Optical wavelength division multiplexing (WDM) system including adaptive cross-talk cancellation  
An optical communication system comprising a transmitter including a data register having a plurality of outputs, each output comprising a separate data channel, a plurality of signal processors,...
8078062 Carrier-suppressed optical pulse train generating device and method  
The device is structured to have a first electric modulation signal generator, a second electric modulation signal generator, a two-mode beat light source and an optical intensity modulator. The...
8073339 ***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST***
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...
8068746 Optimum DC bias for an electro-optic switch  
A method for balancing optical transmission for a first ON state and a second ON state of an electro-optic switch having an RF input port and a DC port, in one implementation, comprises the steps...
8064778 Method and apparatus for controlling tunable transmitter chirp  
A fiber-optic transmission system includes a transmitter having a designed chirp value. The transmitter has first and second inputs for receiving first and second input signals, respectively, used...
8059970 Control system for a polar optical transmitter  
A method of controlling a polar optical transmitter comprising a dual-branch Mach-Zehnder (MZ) modulator driven by a pair of independent electrical drive signals. A cost function is provided which...
8041228 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, including: a splitter (7) for dividing an optical carrier signal into a first and second branch (8a, 8b), a first and second...
8027593 Slow chirp compensation for enhanced signal bandwidth and transmission performances in directly modulated lasers  
The frequency chirp modulation response of a directly modulated laser is described using a small signal model that depends on slow chirp amplitude s and slow chirp time constant τs. The small ...
8023831 Coherent RF-photonic link linearized via a negative feedback phase-tracking loop  
In one of many possible implementations and embodiments, a method is provided for providing linearized phase modulation and demodulation in an RF-photonic link. This includes phase modulating a...
8023775 Super flat optical frequency comb signal generator  
An optical frequency COM generator generating an optical frequency COM having flat spectrum characteristics using a single modulator. The optical frequency COM generator has a drive signal system...
8019232 Method and apparatus for optical phase modulation  
A method of phase modulating optical radiation by the steps of phase modulating the optical radiation by using a modulator having an extinction ratio in order to provide a multilevel phase shift...
8014676 CMOS-compatible tunable microwave photonic band-stop filter  
According to one embodiment, a microwave photonic band-stop (MPBS) filter uses an electrical input signal to drive an optical Mach-Zehnder modulator. A modulated optical carrier produced by the...
8000612 Optical transmission device  
An optical transmission device is provided with an external optical modulator including three or more Mach-Zehnder interferometers and outputs a single-sideband optical intensity-modulated signal...
7991298 DSB-SC modulation system capable of erasing carrier and secondary component  
It is an object of the present invention to provide an optical modulation system capable of suppressing a carrier component (f0) and a high order component (such as a second order component...
7991299 Optical transmitter with driving voltage control and method  
An exemplary aspect of the invention is an optical transmitter that emits a light signal, including: a light source; a Mach-Zehnder optical modulator; a modulator driver; a wavelength information...
7986885 Method and apparatus for control of DPSK and DQPSK receivers and transmitters  
An optical communication device such as a transmitter or receiver has a control loop for controlling relative phase of two related optical signals based on signal peak intensity. An optical...
7983568 Apparatus and method for visible light communication  
Disclosed are an apparatus and a method for visible light communication, which apparatus uses an illuminator equipped with a plurality of light sources, so that the apparatus can be used for...
7974542 OTDM-DPSK signal generator capable of detecting an optical carrier phase difference between optical pulses  
An OTDM-DPSK signal generator includes an optical splitter, a first and a second phase modulator, an optical coupler, and a monitor signal splitter. The optical splitter splits an optical pulse...
7974534 Wideband microwave and millimeter wave filters using photonic spectral filtering  
An apparatus and method is disclosed for producing and filtering optical and electrical waveforms. The apparatus includes an electro-optical modulator, an optical filter capable of modulating at...
7970287 Multi-level optical data communication circuit  
A driver circuit is coupled to an optical waveguide transmitter. The driver circuit has a current generator that is in series with the transmitter, and a current robbing circuit is coupled to the...
7957652 Optical FSK/SSB modulator having intensity balance function  
It is an object of the present invention to provide an optical modulator which is capable of adjusting optical intensity of optical signals which contains non-desired components so that the...
7953328 Optical DQPSK transmitter phase monitor and control  
An apparatus and a method for a I-Q quadrature modulation transmitter monitor a phase bias between an I branch and a Q branch of the I-Q quadrature modulation transmitter. The I-Q quadrature...
7953329 Optical communication apparatus and optical add/drop apparatus  
An apparatus comprising an optical modulator modulating a light in accordance with a modulation signal and an operating point of the optical modulator, to thereby output a modulated optical signal;...
7949259 Visible light communication system and method therefor  
In a visible light communication system, a transmission device includes a data modulation section which assigns 1-bit information to each of visible lights of RGB, and modulates transmission data...
7945173 Control apparatus and control method for optical modulator  
An object of the invention is to provide a control system in which the phase shift between drive signals of an optical modulator can be reliably detected and compensated by a simple configuration....
7936996 Automatic adjusting system of frequency shift keying modulator  
An optical modulator achieving high extinction ratio and an optical modulator system. By a control system performing an adjustment method comprising predetermined steps by applying a bias voltage...
7929864 Optical beamforming transmitter  
The present invention provides an optical beamforming RF transmitter. In one embodiment, the optical beamforming RF transmitter includes an optical WDM splitter having an input and a plurality of...
7925171 Optical transmission apparatus  
An optical transmission apparatus according to the present invention comprises: a plurality of optical modulating sections serially connected to each other via optical fibers; driving sections...
7917039 Signal processing using spectrally phase-encoded optical frequency combs  
Methods, apparatus and systems for an optical system for data harvesting and pattern recognition. The system includes a mode locked laser for producing a comb of optical frequencies that is split...
7903981 Software-based electro-optic modulator bias control systems and methods  
The present invention provides a software-based electro-optic modulator bias control system resident in an optical transceiver including an electro-optic modulator that includes an...
7899338 Method and device for controlling bias of optical modulator  
A method and device for adequately controlling the DC bias of each of the optical modulating sections of an optical modulator even while the optical modulator is operating in normal mode and even...
7877020 Coherent RF-photonic link linearized via a negative feedback phase-tracking loop  
In one of many possible implementations and embodiments, a method is provided for providing linearized phase modulation and demodulation in an RF-photonic link. This includes phase modulating a...
7869709 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...
7864826 Optical transmitter applicable to burst signal and method for controlling the same  
An optical transmitter and a method to control the transmitter are disclosed, in which the optical output may be substantially maintained even in the inactive state of the input burst signal. The...
7865079 MWS drift feedback compensator using VOA and input power dithering  
The invention relates to a compensator of attenuation drift in an optical multi-wavelength switch (MWS) which uses input signal amplitude dither and external VOA dither cancellation to determine...
7853155 Method for adjusting bias in optical transmitter with external modulator  
A method for operating an optical transmitter for transmission of an optical signal over a dispersive fiber optic media to a remote receiver. The method includes the steps of providing a respective...
7840141 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...
Matches 1 - 50 out of 197 1 2 3 4 >