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Optical Communications > Transmitter And Receiver System > Including Compensation

Including Compensation

Including Compensation patent applications listed include Date, Patent Application Number, Patent Title, Patent Abstract summary and are linked to the corresponding patent application page.

04/10/14 - 20140099128 - 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 nonlinear effects in fiber in the optical link for increasing capacity or transmission distance of the fiber, the nonlinearity compensation module includes a spectral slicing...

05/02/13 - 20130108276 - 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 multilevel signal 215 and the output signals are A/D converted, thereafter subjected to retiming processes, and...

09/20/12 - 20120237225 - Communication system
According to an aspect of an embodiment, a communication system includes a transmission apparatus with a coding section that generates multi-level-coded signals and transmits the multi-level-coded signals; and a deskew signal generation section that generates and transmits a deskew signal related to the multi-level-coded signals. The communication system also includes...

09/06/12 - 20120224863 - 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 to become substantially uncorrelated over the aggregate signal bandwidth. Provided that the employed FEC code has sufficient error-correcting capability for average channel conditions,...

09/06/12 - 20120224864 - Method and arrangement for stabilizing a color coding method and optically transferring data
A method is provide for optically transferring data between a transmitter and a receiver employs a color coding method based on a plurality of elementary colors for encoding and transferring the data. Each elementary color is transmitted by one optical radiation source each on the transmitter side, and is received...

07/26/12 - 20120189320 - 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. The magnitude of the correlation between derivatives is measured to determine the presence of skew. Correlation between...

07/12/12 - 20120177383 - Optical receiver and optical transmission system
An optical receiver includes: a first generator to generate, from an optical signal to which a reference signal is inserted, a first digital signal representing a signal component of a first partial band including the reference signal, using a first local oscillation light of a first frequency; a second generator...

06/07/12 - 20120141138 - System, devices and methods for subcarrier recovery at local oscillator frequency in optical ofdm system
The invention provides methods, devices and a system for recovering the corrupted subcarrier at the local oscillator (LO) frequency in coherent optical OFDM transmission. The method includes performing advanced coding on a data signal to obtain an encoded signal; performing high order modulation on the encoded signal to obtain a...

06/07/12 - 20120141139 - System and method for optical-electrical-optical reach extension in a passive optical network
A system and method are disclosed in which an optical network may include an optical-electrical converter module within an OEO (Optical Electrical Optical) reach extension system (OEO RE system), the OEO RE system having an OEO port and including a downstream frame regeneration block; and a downstream control data extraction...

05/24/12 - 20120128373 - Method and apparatus of performing ont wavelength tuning via a heat source
A method and apparatus of tuning a signal received from a first network terminal at a second network terminal is disclosed. The method may include receiving the signal at the second network terminal. The signal may be operating at a first wavelength. The method may also include determining a port...

04/05/12 - 20120082465 - Optical transmitting apparatus, optical receiving apparatus, and optical communication system comprising them
A phase shift unit provides a prescribed phase difference (π/2, for example) between a pair of optical signals transmitted via a pair of arms constituting a data modulation unit. A low-frequency signal f0 is superimposed on one of the optical signals. A signal of which phase is shifted by π/2...

03/01/12 - 20120051755 - 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 components including correlated-photon pair wavelength components outputted from an optical loop path. The first and second optical couplers output light beams, which are sent...

02/02/12 - 20120027418 - Equalizer for an optical transmission system
An equaliser (60) processes, in the electrical domain, a signal obtained from a path of an optical transmission system. The equaliser comprises N cascaded stages (where N≧1). At least one of the stages comprises a cascade of a linear equalisation element (61) and a non-linear equalisation element (62). The equaliser...

02/02/12 - 20120027419 - 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 configured to receive an optical OFDM bit stream including an OFDM symbol bearing payload data and a symbol header preceding the OFDM payload data. The frequency...

01/19/12 - 20120014698 - Transmission of pathological data patterns
A method and apparatus is presented for reducing or eliminating pathological data patterns from signals for transmission over optical communications systems. One embodiment includes a decoder/deserializer configured to receive an encoded serial digital signal, a ditherer configured to dither a least significant bit of each digital data word, and a...

12/15/11 - 20110305462 - Power manageable optical ofdm transponder
The invention relates to the field of optical transmission systems. In particular, the invention relates to a system and a method for adjusting an optical OFDM transmission system in a power optimized manner An optical OFDM transmitter (310) operating at an overall bit-rate is provided. It comprises an adjustable mapping...

12/01/11 - 20110293289 - Method, system, and apparatus for blind equalization of bpsk signals
A system, method, and apparatus is disclosed for enabling a constant modulus algorithm (CMA) to be reliably used for blind equalization training of an equalizer. According to one embodiment, received signals in a binary phase shift keying (BPSK) format are converted to a quadrature phase shift keying (QPSK) format, to...

11/10/11 - 20110274439 - Communication system comprising a tunable laser
A communication system includes a communication unit with a first part and a number of a second part, where the second part is arranged to be placed at the location of an end user, and where the first part is common for a number of second parts. The first part...

09/15/11 - 20110222864 - 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 are each configured to be received using coherent digital receivers at a second node of the...

08/18/11 - 20110200338 - Visible-light communication system system and method
Disclosed is a visible light communication system including a transmission device, including multiple light emitting units emitting light of different colors and mapping transmission data to a chromaticity point, calculating luminescence of each of the light emitting units, generating a preamble signal for channel matrix estimation, and emitting light based...

06/30/11 - 20110158654 - Differential quadrature phase shift keying system, method, and device
A differential quadrature phase shift keying (DQPSK) system, method, and device are disclosed. The DQPSK system includes: a transmitter, configured to: pre-code an input first signal and second signal, and generate an in-phase signal and a quadrature signal; modulate the in-phase signal to generate a first differential phase shift keying...

05/19/11 - 20110116806 - 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 frequencies above 10 GHz, making it feasible to employ decision feedback equalization in optical transceiver modules. An adaptation technique is also disclosed to maximize...

05/05/11 - 20110103804 - 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 transmission line and an standby system optical transmission line, an optical switch that switches an optical transmission line between the active system optical transmission...

05/05/11 - 20110103805 - Methods for accessing a process chamber using a dual zone gas injector with improved optical access
Methods for processing events occurring in a process chamber are provided. In one method, an operation includes carrying gas and receiving an optical signal from the process chamber to an analysis tool that operates in response to the optical signal having a signal-to-noise ratio (SNR) for process analysis. And, dividing...

01/27/11 - 20110020010 - 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 optical amplifier for amplifying a power of the optical signal. The method comprises applying a predetermined spectral tilt...

01/20/11 - 20110013914 - Method and apparatus for improving reception of optical signals
A method and apparatus for receiving digital information transmitted via an optical signal over an optical channel wherein the optical signal includes an optical carrier (402) and at least one information-bearing optical sideband (404) in the optical frequency domain. The transmitted optical power is distributed between the optical carrier (402)...

12/23/10 - 20100322637 - Optical communication system having enhanced spectral efficiency using electronic signal processing
An optical communication system combines strong electrical pre-filtering of data at the transmitter and digital feedback equalization (DFE) at the receiver to enhance spectral efficiency. The system can be applied to optical networking and digital communication systems, including binary modulated systems optical network systems....

11/25/10 - 20100296819 - 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 receive the signals. The received signals are processed using a plurality of filters. Each filter is used sequentially, one per symbol interval,...

09/30/10 - 20100247110 - Optical dispersion compensator, optical transmission apparatus, optical transmission system, and method thereof
An optical dispersion compensator including a first optical device in which light inputted from a first port is outputted from a second port and light inputted from the second port is outputted from a third port, an optical filter type dispersion compensation device that receives light from the second port...

09/16/10 - 20100232805 - Local oscillator frequency offset compensation in a coherent optical signal receiver
A system and method implementing dual stage carrier frequency offset compensation (FOC) in a coherent receiver for an optical communication system. In the first stage, a feed forward FOC function compensates for relatively slowly drifting frequency offsets. In a second stage, a decision-feedback FOC function compensates for relatively quickly drifting...

08/26/10 - 20100215378 - Apparatus and method for interference mitigation and channel selection for visible light communication
A device and method for device association, interference mitigation and channel selection for use in a visible light communication (VLC) network. The method includes transmitting on every one of a plurality of supported color channels of a first device to estimate an ambient interference on each supported color channel. The...

07/01/10 - 20100166435 - 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 value transmitted through a working path at a second wavelength is received through a non-working path at a first wavelength in an optical communication...

06/10/10 - 20100142972 - 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 to receive the fiber optic signal from the first fiber optic device. The second fiber optic device includes an...

06/03/10 - 20100135670 - Phase-modulating communication device
A system, method, and communication device are disclosed. The system can include an optical interrogator and a phase-modulating communication device. The communication device can include a retro-optimized lens, a phase modulator, and a processor. The retro-optimized lens can be a non-imaging optical arrangement configured to minimize deviation between an incoming...

03/25/10 - 20100074627 - Interference-rejection coding method for an optical wireless communication system and the optical wireless communication system thereof
An interference-rejection coding method for an optical wireless communication system and such an optical wireless communication system are provided. The coding method uses delay modulation, block code techniques and filtering to reduce the low frequency interference from light sources. A plurality of codewords from the block codes are reserved for...

03/18/10 - 20100067918 - 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 configured to introduce a THz signal to the modulator and the THz receiver is configured to receive the THz signal from the modulator and demodulate...

02/18/10 - 20100040380 - 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 bright pulses represent binary 1 and the second parallel optical signal is arranged to have bright pulses represent binary...

02/11/10 - 20100034542 - Methods and apparatus for generation and transmission of optical signals
Methods and apparatus (100) for composing, generating and transmitting information-bearing optical signals are provided. An information-bearing electrical signal is composed (108) having desirable spectral properties, preferably configured to ensure that undesired interference between electrical spectral components generated in a square-law direct detection process (120) at a corresponding optical receiver (104)...

01/21/10 - 20100014872 - Method and apparatus for generating a dispersion compensation signal
An apparatus for generating a dispersion compensation signal includes a splitting module for splitting a data signal to be transmitted into N channels of data signals; N pre-processing modules for adjusting in frequency domain the phases and amplitudes of the N channels of data signals and outputting N channels of...

01/14/10 - 20100008678 - 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 an OTU overhead (OH) section, an ODU section, and a forward error correction (FEC) parity section. A training signal wrapper is added to...

12/31/09 - 20090324246 - 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 device is placed at a zero dispersion point of the transmission line, and it is suitable for suppressing amplitude fluctuations about a...

09/10/09 - 20090226183 - 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 signal based on a specified data pattern. By performing wavelength conversion using a CW laser signal having wavelength stability greater than that of the input signal,...

06/25/09 - 20090162074 - Wavelength dispersion compensation control method and wavelength dispersion compensation control device
A wavelength dispersion compensation control method determining whether a clock component is contained in an optical signal received from an optical transmission path and, if a clock component if contained in the optical signal, extracting the clock component, and stopping control of a variable wavelength dispersion compensator when no clock...

06/18/09 - 20090154938 - 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. The system also sets a frequency difference for the two frequencies of the optical pulses, calculates...

04/02/09 - 20090087194 - 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 with respect to a transmission signal in which transmission information has been encoded according to a preset format,...

03/26/09 - 20090080901 - Dispersion compensating apparatus and dispersion compensating method
In a dispersion compensating apparatus, a reference identifying unit identifies a reference (X dB down) that makes a penalty lower than a predetermined value in accordance with optical signal information and a reference identifying table, and a VIPA plate temperature adjusting unit adjusts a refractive index of a VIPA plate...