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Optical Communications > Transmitter And Receiver System > Including Compensation > Reducing Distortion Or Dispersion

Reducing Distortion Or Dispersion

Reducing Distortion Or Dispersion patent applications listed include Date, Patent Application Number, Patent Title, Patent Abstract summary and are linked to the corresponding patent application page.

01/02/14 - 20140003822 - Optical communication apparatus and method
An apparatus for optical communication and optical communication method are provided, the method comprising the steps of generating an optical signal for transmitting the sequence of information data, transmitting the sequence of information data as a sequence of transmit matrices, S(k) being the k-th transmit matrix and k being a...

11/28/13 - 20130315607 - Low cost direct modulation and coherent detection optical ofdm
System and method for compensating distortions introduced by an optical channel and by at least one directly modulated transmitting laser that transmits a modulated optical signal that carries data to a receiving end over the optical channel. At the receiving end, the transmitted signal is received by a coherent receiver...

10/17/13 - 20130272718 - System and method for nonlinear self-filtering via dynamical stochastic resonance
A system and method for filtering and enhancing signals from a noise background based on the nonlinear interaction of waves. The system and method amplify low-level signals, hide information in the signals, and then nonlinearly recover the signals. With the present invention, this can be performed for both spatial beams...

10/17/13 - 20130272719 - Method and apparatus for compensating nonlinear distortions in intensity modulation-direct detection system
The embodiments of the present invention provide a method and an apparatus for compensating nonlinear distortions in an intensity modulation-direct detection (IM-DD) system; wherein the method comprises: calculating, according to nonlinear coefficients and differences between values of an input signal at different time, nonlinear distortions of the input signal, so...

11/08/12 - 20120281988 - Optical transmission system
In an optical multilevel transmitter (210), a polar representation of an optical multilevel signal (r, φ) is generated by a polar coordinate multilevel signal generation circuit (212), input to an optical amplitude modulator (211) and a polar coordinate type optical phase modulator (201), and output as an optical multilevel modulated...

10/25/12 - 20120269519 - Apparatus and method to calculate a noise figure of an optical amplifier for wavelength channels in a partial-fill scenario to account for channel loading
An apparatus comprising a processor configured to calculate a noise figure of an optical amplifier for a plurality of selected wavelength channels in a partial-fill scenario that accounts for channel loading. The noise figure is calculated using a plurality of corresponding noise figure correction values at a plurality of wavelengths...

10/18/12 - 20120263479 - Optical network communication system with variable optical attenuation and method of operation thereof
A method of operation of an optical network communication system includes: coupling an input fiber; receiving light with a lens from the input fiber, the light having a predetermined amount of mode-field-diameter dispersion; tilting a mirror for reflecting the light after the light is transmitted through the lens; and positioning...

12/29/11 - 20110318019 - Communication transmission system with optically aided digital signal processing dispersion compensation
The present disclosure is directed to managing dispersion compensation in optical transmission line utilizing single mode fiber with no in-line dispersion compensation. A communication system terminal includes one or more dispersion compensation modules configured to compensate for at least a portion of optical dispersion associated with optical data signals supplied...

12/22/11 - 20110311233 - Automated dispersion compensation over a broad wavelength range for coherent optical pulses
The present application is directed to an apparatus and method for the automated compensation of dispersion over a broad wavelength range for coherent optical pulses. In one embodiment, the present application discloses an automatic dispersion compensating optical apparatus configured to change chirp introduced into an optical signal by an optical...

10/13/11 - 20110249979 - Tunable dispersion compensator configured for continuous setpoint control
A tunable dispersion compensator (TDC) is tuned from a first dispersion setpoint to a second dispersion setpoint while maintaining continuity of the dispersion. The dispersion tuning follows a pre-determined trajectory in the time domain, so that continuity of the optical dispersion across the channel optical bandwidth is maintained while minimizing...

08/25/11 - 20110206382 - Method and a system with distortion compensation
The invention relates to a method and an apparatus for distortion compensation of signals transmitted via a bidirectional link between a client device and a host device, said method comprising the steps of performing a post-distortion-compensation for an upstream signal received by the host device on said bidirectional link by...

12/30/10 - 20100329694 - Electrical domain suppression of linear crosstalk in optical communication systems
The present disclosure provides electrical domain suppression of linear crosstalk in optical communication systems using single-carrier implementations. This electrical domain suppression applies spectral shaping in the electronic radio frequency (RF) domain. Advantageously, spectral shaping in the electronic RF domain transfers system complexity from the bulk optical domain into the highly...

12/30/10 - 20100329695 - Dispersion slope compensation and dispersion map management systems and methods
The present disclosure relates to dispersion slope compensation and dispersion map management systems and methods in an optical network utilizing a reconfigurable optical add-drop multiplexer (ROADM) with a plurality of different values of dispersion compensation modules (DCMs). The DCMs form a dispersion compensation ladder at certain intermediate nodes in the...

12/16/10 - 20100316392 - Tunable dispersion compensation apparatus, optical reception module and method
An apparatus includes: a first dispersion compensator that is arranged on an optical path between an input port and an output port, that has a dispersion compensation band, and that substantially compensates a chromatic dispersion to signal light by using a variable amount of dispersion compensation, a second dispersion compensator...

10/21/10 - 20100266291 - System and method for coherent detection of optical signals
An optical communication system (100; 2300) comprises at least a transmitter (110) apt to emit a differential phase shift keying (DPSK) optical signal having a bit-rate equal to R, at least a receiving system (1200) for receiving the differential phase shift keying optical signal; and an optical link (130) optically...

08/05/10 - 20100196017 - Distortion compensating apparatus, optical receiving apparatus, and optical transmitting and receiving system
A distortion compensating apparatus which compensates for distortion in a waveform of a received light signal through a digital signal processing includes a plurality of fixed amount compensators which compensate for the distortion in the waveform at respective given compensating amounts. The combination of operating states of the plurality of...

06/24/10 - 20100158537 - Propagation apparatus and dispersion value setting method
A propagation apparatus includes a plurality of dispersion compensation execution units which accept a signal of a single wavelength from a wavelength-multiplexed signal which is received and execute dispersion compensation on the signal by inputting the accepted signal to a tunable dispersion compensator with an adjusted dispersion value, and a...

06/10/10 - 20100142973 - Semiconductor laser with low relative intensity noise of individual longitudinal modes and optical transmission system incorporating the laser
A semiconductor laser comprises an electrically isolated active section and at least one noise reducing section and operates on a ground state transition of a quantum dot array having inhomogeneous broadening greater than 10 nm. The laser preferably emits more than 10 optical modes such that a total relative intensity...

04/22/10 - 20100098434 - Method for determining value of chromatic dispersion compensation
A method for determining a value of chromatic dispersion compensation in an optical network including a plurality of nodes connected by at least one transmission line, the plurality of nodes including a plurality of dispersion compensators, the optical network including a plurality of wavelength paths between the optional nodes, the...

04/15/10 - 20100092181 - Low conversion rate digital dispersion compensation
A method of suppressing effects of aliasing in a system for digitally processing a high speed signal having a symbol rate of 1/T. The high speed signal is sampled at a fractional multiple (N) of the symbol rate, wherein 1<N<2, to generate a corresponding sample stream, and filtered using a...

02/25/10 - 20100046961 - Distortion compensator, optical receiver, distortion compensator and optical receiver controlling methods, and optical transmission system
A distortion compensator, an optical receiver and a transmission system including an operation selectively compensating for linear waveform distortion exerted on an optical signal via a plurality of distortion compensators and compensating for nonlinear waveform distortion exerted on the optical signal using nonlinear distortion compensators....

02/04/10 - 20100028020 - Multimode optical fibers
A multimode optical fiber has an equivalent modal dispersion value (DMDinner&outer) of less than 0.11 ps/m for (Δλmax×D)>0.07 ps/m as measured on a modified DMD graph. The modified DMD graph accounts for chromatic dispersion to ensure that the multimode optical fiber has a calculated effective bandwidth EBc greater than 6000...

01/21/10 - 20100014873 - Adaptive non-linearity compensation in coherent receiver
The invention relates to optical communication, in particular to compensation of non-linear distortions incurred in high bit-rate optical communication systems. A method and system for compensating self-phase modulation at an optical receiver of an optical transmission system using polarization division multiplexing and a modulation scheme with constant amplitude is proposed....

12/31/09 - 20090324247 - Optical modulator
The present invention relates to an optical modulator that generates quaternary amplitude modulated light without inter-symbol-interference by splitting input light into three optical paths, generating a continuous wave signal in a first optical path, generating binary phase modulated lights using a single drive MZ type optical phase modulator in second...

10/01/09 - 20090245809 - Optical transmission system
An optical transmission system capable of efficiently reducing waveform distortion of an optical signal. A transmitting-side distortion compensation coefficient storage of a transmitting station stores transmitting-side distortion compensation coefficients for compensating for waveform distortion of an optical signal to be transmitted to a receiving station. A transmit signal processor performs...

08/13/09 - 20090202255 - Abstract optical receiver with automatic distortion cancellation
An optical receiver includes closed-loop composite second order (CSO) distortion correction logic. An optical communication system includes a transmitter comprising open-loop composite second order (CSO) distortion correction logic, and a receiver comprising closed-loop composite second order (CSO) distortion correction logic....

07/30/09 - 20090190933 - Dispersion and nonlinear compensator for optical delivery fiber
A system for dispersion compensation in a terahertz system includes an optical fiber configured to transmit an optical pulse, a compensator optically coupled to the optical fiber, the compensator configured to compensate for a dispersion of the optical pulse caused as the optical pulse propagates through the optical fiber, and...

04/16/09 - 20090097860 - Optical dispersion compensation
A method of providing dispersion compensation includes providing a dispersion signal indicative of an amount of dispersion for at least one channel of a multi-channel optical signal. A dispersion compensator is controlled in accordance with the dispersion signal to optically compensate for the dispersion of the optical signal....

03/26/09 - 20090080902 - Dispersion compensation controlling apparatus and method for searching for amount of dispersion control
In order to enhance dispersion control, the apparatus includes a dispersion controller; a quality index generator generating a quality index representing a quality of an optical signal output from the dispersion controller; and a searching unit searching for an amount of dispersion control applying to the dispersion controller which amount...