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US20140119740 Opto-Isolator With Compensation Circuit  
An opto-isolator with a compensation circuit is disclosed. The compensation circuit may be configured to compensate degradation of the light source of the opto-isolator. The compensation circuit...
US20140119739 Opto-Isolator With Correction Circuit  
An opto-isolator with a correction circuit is disclosed. The correction circuit is configured to make adjustments for degradation of the light source of the opto-isolator. The correction circuit...
US20060127100 Simplified signal regenerator structure  
Systems and methods for reconditioning an optical signal by OE (optical-to-electrical) converting the signal, recovering clock and data information and performing 3R reconditioning to reamplify,...
US20110222864 METHOD AND SYSTEM FOR COMPENSATING FOR OPTICAL DISPERSION IN AN OPTICAL SIGNAL  
A method for compensating for optical dispersion includes receiving an optical signal at a first node of an optical network that includes a first set of channels and a second set of channels that...
US20100067902 OPTICAL TRANSMITTER ERROR REDUCTION USING RECEIVER FEEDBACK  
Described is a method of reducing transmitter error in an optical communications channel. An optical signal transmitted from an optical transmitter that has impairment due to transmitter error is...
US20100067918 ULTRA-MINIATURIZED THZ COMMUNICATION DEVICE AND SYSTEM  
Ultra-miniaturized THz spectrometer/multi-channel receiver devices are provided. THz communication devices employ a THz transmitter, a THz receiver and a modulator, wherein the THz transmitter is...
US20110116806 High-Speed Adaptive Decision Feedback Equalizer  
A decision-feedback equalizer (DFE) can be operated at higher frequencies when parallelization and pre-computation techniques are employed. Disclosed herein is a DFE design that operates at...
US20080138084 METHOD AND APPARATUS FOR TRANSMITTING ERROR INFORMATION BETWEEN ETHERNET NETWORK AND SYNCHRONOUS DIGITAL HIERARCHY NETWORK  
Provided are a method and apparatus for transmitting error information between an Ethernet network and a synchronous digital hierarchy (SDH) network. According to the present invention, when an...
US20090016739 PATTERN EFFECT REDUCTION OF OPTICAL SIGNALS  
A passive optical equalizer and a predistortion technique are employed to reduce pattern effect in optical signals which result from narrow filtering.
US20110020010 SPECTRAL TILT COMPENSATION  
A method of compensating for spectral tilt in an optical transmission system. The system comprises at least one span of optical waveguide for transmission of an optical signal and at least one...
US20070223933 Optical transmitter with feed-forward compensation  
An optical transmitter with a feed-forward compensation is disclosed. The optical transmitter includes a first light source receiving a second electrical signal to convert into a first optical...
US20100183310 DISPERSION COMPENSATOR  
Conventional dispersion compensators were not sufficient to satisfy a demand to set a different dispersion value for each WDM wavelength in a ring-mesh type network that utilizes wavelength...
US20120189320 SKEW COMPENSATION AND TRACKING IN COMMUNICATIONS SYSTEMS  
Compensation for in-phase (I) and quadrature (Q) timing skew and offset in an optical signal may be achieved based on the correlation between derivatives of I and Q samples in the optical signal....
US20080310858 APPARATUS AND METHOD OF OPTICAL COMPENSATION FOR SUBMARINE OPTICAL CABLE  
The present invention provides optical compensation for a submarine optical cable optical. A dummy light module generates a dummy light signal according to a continuous spectrum in a predetermined...
US20090103930 Method and system of tracking optical beam shift  
An optical interconnect includes an optical transmitter having a plurality of optical sources; a light sensing array configured to receive optical beams emitted from the optical sources; and a...
US20090010656 Optical waveform measurement system and optical waveform measurement method  
In an optical waveform measurement system, a phase comparator compares phases between an electric signal output from a PD and an electric signal output from a mixer, and outputs a signal having an...
US20120128362 COMMUNICATION SYSTEM, DISPERSION SLOPE IMPARTING SECTION, AND METHOD FOR COMMUNICATING  
A communication system includes a transmission path through which an optical signal is propagated; and dispersion slope imparting sections provided on a transmitting side and a receiving side of...
US20080002986 Optical spatial communication method, optical transmission apparatus, optical reception apparatus, and optical spatial communication system  
Long-distance, high speed light spatial communication is realized by regulating light transmission timing in a plurality of light emitting elements arranged on a transmission panel in an optical...
US20100166435 DISPERSION COMPENSATION METHOD AND DEVICE IN OPTICAL COMMUNICATION SYSTEM  
A dispersion compensation method and a dispersion compensation device in an optical communication system are provided. The method mainly includes the following steps. A dispersion compensation...
US20090003837 END-TO-END CHROMATIC DISPERSION CHARACTERIZATION OF OPTICALLY AMPLIFIED LINK  
An economic way of determining the chromatic dispersion along a link of a DWDM network is provided. A transmitter modulates the output signals of two lasers operating at two different wavelengths...
US20070140702 Method and system for providing timing recovery in an optical system  
The invention regards a new threshold crossing timing recovery scheme for use in high capacity optical disc systems. The timing error of a timing error detector is multiplied with a weighing...
US20090016741 OPTICAL COMMUNICATION  
The present invention relates to a method of optical communication, in particular optical communication involving spectral filtering in a passive optical network. The method includes the steps of:...
US20080056725 METHOD AND SYSTEM FOR OPTICAL TRANSMISSION SIGNAL LEVEL CONFIGURATION  
The invention relates to an optical transmission system comprising transmitter and receiver devices and comprising automatic optical signal level configuration means which provide the same fixed...
US20120224863 MULTIPATH CHANNEL FOR OPTICAL SUBCARRIER MODULATION  
In a representative embodiment, a multipath channel and an optical subcarrier modulation scheme are designed in concert to cause different modulated subcarriers of the optical communication signal...
US20050095006 Cable station for an undersea optical transmission system  
In accordance with the present invention, a land-based cable station is provided for an undersea optical transmission system. The cable station includes submarine line terminal equipment (SLTE)...
US20120051755 METHOD AND SYSTEM FOR QUANTUM KEY DELIVERY UTILIZING A CONVERSION EFFICIENCY OF DFG  
A quantum key delivery system includes an optical circulator, an optical low-pass filter, optical splitters, and first and second optical couplers arranged for outputting various wavelength...
US20080181617 Method and apparatus for correcting color imbalance of visible light in wavelength division parallel visible light communications  
Disclosed is a method and an apparatus for correcting a color imbalance of visible light in wavelength division parallel visible light communications. The method includes the steps of: inverting...
US20120027419 FRAME/SYMBOL SYNCHRONIZATION IN COHERENT OPTICAL OFDM  
One aspect provides an optical communication system. The system includes an optical-to-digital converter, a frequency estimator and a symbol synchronizer. The optical-to-digital converter is...
US20140099128 Inter-band cross-phase modulation compensation for the mitigation of intra-channel nonlinear impairments in optical fiber transmission  
An optical communication system includes a digital signal processer coupled to the coherent receiver, said coherent receiver including a nonlinearity compensation module for compensating for...
US20110299852 OPTICAL TRANSMISSION AND RECEPTION SYSTEM, OPTICAL TRANSMITTING AND RECEIVING APPARATUS, AND OPTICAL TRANSMISSION AND RECEPTION METHOD  
An optical transmission and reception system in which a plurality of tributary signals are converted into multilevel modulated light for transmission and reception. An apparatus for transmitting...
US20090226183 OPTICAL PATTERN RECOGNITION HAVING REDUCED SENSITIVITY TO WAVELENGTH INSTABILITY  
In exemplary embodiments, all-optical pattern recognition for an optical input signal is achieved by wavelength-converting the input signal and then passively correlating the wavelength-converted...
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...
US20080226300 OPTICAL DIFFERENTIAL-PHASE-SHIFT-KEYED DEMODULATOR APPARATUS AND METHOD  
A system and method for demodulating an optical differential-phase-shift-keyed (DPSK) input signal using a Fabray-Perot etalon filter. In one embodiment the system receives a transmitted wavefront...
US20100008678 Multi-Channel Optical Transport Network Training Signal Wrapper  
Systems and methods are provided for multi-channel ITU G.709 optical transport network (OTN) transmission and receiving. The transmission method accepts a canonical ITU G.709 OTN frame including...
US20080069572 Optical transmission device  
Occurrence of a reception error and breakdown of a device are prevented by absorbing an optical surge that occurs at the time of an instantaneous interruption of light. Dummy light having a...
US20100040380 OPTICAL CORRELATION APPARATUS  
An optical correlation apparatus is described which forms first and second parallel optical signals in response to a serial input data stream. The first parallel optical signal is arranged to have...
US20080226301 System and Method For Increasing Spectral Efficiency, Capacity and/or Dispersion-Limited Reach of Modulated Signals in Communication Links  
A system and method for increasing spectral efficiency, capacity and/or extending dispersion-limited reach in a communication link employs narrow filtering of a baseband signal to reduce the...
US20080124091 Reduction of Signal Degradations in Optical Transmission Links  
Methods, devices and/or systems are provided for reducing signal degradations in optical transmission links. A means for ensuring a flexible manipulation for the improvement of an optical signal,...
US20130216221 System and Method Including Modified Bit-Interleaved Coded Modulation  
A system and method with a modified bit-interleaved coded modulation with iterative decoding (BICM-ID). Coded and interleaved bits are combined and coded with a second FEC code that is then mapped...
US20080279565 Apparatus And Method For Selfadapting Dispersion Compensation  
The present invention discloses an apparatus and method for adaptive dispersion compensation, the apparatus comprising: a coarse-grain tunable dispersion compensator, a receiver with electric...
US20130108276 OPTICAL RECEIVER AND OPTICAL TRANSMISSION SYSTEM  
Optical receiver 300 uses two optical delay detectors 223 (set such that the delay times T are equal to symbol time and the phase differences are zero and 90 degrees) to receive an optical...
US20100142972 OPTICAL RECEIVER HAVING AN AUTOMATIC FIBER OPTIC SIGNAL ADJUSTMENT CIRCUIT  
A fiber optic communication system includes a first fiber optic device configured to transmit a fiber optic signal. A second fiber optic device is in fiber optic communication with and configured...
US20090087194 Optical transmission system and optical transmission method  
An optical transmission system, where in an optical transmitter a detection bit having a specific pattern set according to the number of bits to be transmitted within one symbol time, is imparted...
US20100266289 Even-Order Harmonic Cancellation and Increased RF Gain Using Dual-Output Mach-Zehnder Modulator with Two Wavelength Input  
A method and system for processing analog optical signals to produce a single RF output free from even-order harmonic distortion. Two analog optical signals of different wavelengths λ1, λ2 are...
US20090154938 IN-CHANNEL RESIDUAL CHROMATIC DISPERSION MEASUREMENT  
A system generates optical pulses, that include two frequencies within one optical channel, at a first end of an optical link, and receives the optical pulses at a second end of the optical link....
US20110103804 OPTICAL TRANSMISSION SYSTEM  
An optical transmission system is provided with an optical transmission apparatus, an optical reception apparatus, an optical transmission line redundantly configured with an active system optical...
US20100296819 Optical Receivers and Communication Systems  
Optical communications systems and methods transmit signals through an optical medium at a rate associated with a symbol interval. Receivers are communicatively coupled to the optical medium, and...
US20090324246 Method of Limiting the Non-Linear Phase Noise of a Phase-Modulated Optical Signal of Constant Amplitude, and an Associated Device  
A non-linear phase noise limiter device limits the non-linear phase noise that affects a phase-modulated input optical signal of constant mean amplitude conveyed over a transmission line. The...
US20100271204 Optical amplifier module and dispersion compensation fiber loss detection method  
An optical amplifier module includes a first optical amplifier to amplify main signal light to be supplied to a dispersion compensation fiber (DCF), a second optical amplifier to amplify the main...
US20140328588 OPTICAL COMMUNICATION SYSTEM, OPTICAL TRANSMITTER, AND OPTICAL RECEIVER  
An optical communication system includes an optical transmitter, and an optical receiver connected via a transmission line to the optical transmitter, in which system the optical transmitter...

Matches 1 - 50 out of 96 1 2 >