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7623798 Polarization mode dispersion mitigation of multiple optical communication channels  
An optical transmitter for an optical communication system is provided. Included in the transmitter is a first optical delay element configured to generate a second optical signal from a first...
7623796 Data-aided multi-symbol phase estimation for optical differential multilevel phase-shift keying signals  
A data-aided, multi-symbol phase estimation (MSPE) scheme is described for improving receiver sensitivity in the direct-detection of optical differential multi-level phase-shift keying (ODmPSK)...
7623790 Signal identification method  
A signal identification method for efficiently identifying Dense Wavelength Division Multiplexing (DWDM) channel modulation formats, signal powers, and center frequency detuning of signals that may...
7620332 Optical receiving unit reducing cross talk between optical transmitting unit and optical transmitting/receiving apparatus installing the same  
The present invention provides an optical transceiver to reduce a crosstalk in sufficient. The optical receiving unit of the invention includes an O/E-converter, a signal processing unit, and an...
7620331 Receiver circuit having an optical receiving device  
The invention relates to a receiver circuit having an optical receiving device, a plurality of amplifiers that are connected to the receiving device, and circuit means or a control circuit for...
7612322 Temperature-compensated high dynamic range optical receiver  
A light sensor having a photocurrent subsection and an interface circuit is disclosed. The photocurrent subsection includes a photodetector, an amplifier, a diode and an impedance element. The...
7609981 Deliberate signal degradation for optimizing receiver control loops  
Techniques to control an optical receiver having a control loop using Bit Error Rate (BER). In one implementation, a bit error rate (BER) associated with a received optical signal is determined....
7603045 Method and system for automatic feedback control for fine tuning a delay interferometer  
A method for receiving an optical signal is included where an ingress signal is split into a first portion and a second portion. A relative delay is induced between the first portion and the second...
7603044 Polarization control for multichannel and polarization multiplexed optical transport networks  
A system and method are provided for calibrating orthogonal polarity in a multichannel optical transport network (OTN) receiver. The method accepts a composite signal and separates the polarization...
7599631 Burst optical receiver with AC coupling and integrator feedback network  
A burst optical receiver includes an optical signal inlet, an optical-electrical signal converter, an AC coupling network, an integrator feedback network, and an electrical signal outlet. The AC...
7593651 Control of avalanche photodiodes bias voltage  
An optical communications system using forward error correction (FEC) to correct errors in signals carried by the system. Optical signals on the system are dropped at nodes and converted to...
7593647 Apparatuses and methods for automatic wavelength locking of an optical transmitter to the wavelength of an injected incoherent light signal  
An optical transmitter has a resonance wavelength characteristic that varies with the refractive index of the optical transmitter. The optical transmitter receives a narrow band injected wavelength...
7583904 Transimpedance (TIA) circuit usable for burst mode communications  
A transimpedance amplifier (TIA) circuit usable for burst mode communications is provided. The TIA circuit includes a TIA stage, a limiter-amplifier, and a DC restoration loop. The invention...
7574146 Pattern-dependent error counts for use in correcting operational parameters in an optical receiver  
An optical transmission network includes an optical transmitter photonic integrated circuit (TxPIC) chip, utilized in an optical transmitter and has a plurality of monolithic modulated sources...
7570889 Common electronic dispersion compensation arrangement for use with multiple optical communication channels  
An electronic dispersion compensation (EDC) arrangement for a multi-channel optical receive utilizes a time division technique to “share” a common adaptive algorithm block between a plurality...
7555228 Method and system for facilitating burst-mode optical power measurement  
An optical line termination comprises a DC current load, power measurement circuitry, upstream data path circuitry and current mirror circuitry. The current mirror circuitry is connected between...
7551815 Method of monitoring and controlling the bit error rate (BER) in an optical communication network  
A method is disclosed for monitoring and controlling the bit error rate (BER) in an optical communication network where an optical receiver in the optical transmission network. The method includes...
7539424 Burst mode optical receiver for maintaining constant signal amplitude  
Provided is a burst mode optical receiver capable of accurately detecting an optical signal of minimum amplitude, by automatically controlling a gain of a pre-amplifier according to an amplitude of...
7536114 Method and system for converting an optical received pulse train into an electrical output pulse train  
The aim of the invention, which concerns a method and a system for converting an optical received pulse train into an electrical output pulse train, is to create a method and an associated circuit...
7522848 Receiver with dynamically adjustable decision threshold voltage based on input power  
According to embodiments of the present invention, an optical transponder and/or optical transceiver includes a decision circuit, which scales a decision threshold voltage based on power in a...
7522847 Continuous time filter-decision feedback equalizer architecture for optical channel equalization  
A communication system having a transmitter transmits an information signal over a communication media and a receiver coupled to the communication media receives the transmitted information signal....
7522845 WDM laser wavelength control  
A transmitter ( 11 ) emits a single wavelength optical signal and transmits this as a wavelength channel ( 13 ) in a compound multiplex signal through the WDM network. The receiver ( 12 ) selects...
7509059 Optical receiver and data communication apparatus comprising same  
An optical receiver is capable of minimizing fluctuations in the pulse width of an electrical signal rendered by converting an optical signal of broad-range illumination. The optical receiver...
7509058 Data transmission apparatus, photoelectric conversion circuit and test apparatus  
The data transmission apparatus for performing data communication based on optical transmission includes a transmitting unit for converting and sending electric communication data, which is to be...
7496298 Adaptive optical equalization for chromatic and/or polarization mode dispersion compensation and joint opto-electronic equalizer architecture  
An apparatus and method for use in an adaptive optical equalizer including, in one embodiment an optical equalizer having an input and output coupled to receive an incoming optical signal and...
7493053 Mechanism to select bandwidth in an optical receiver circuit  
An optical receiver circuit is disclosed. This receiver included in receiver optical sub-assembly (ROSA) adjusts bandwidth based on a voltage level detection at a receiver signal strength...
7486898 Receiver for PMD mitigation by polarization scrambling  
A receiver ( 10 ) for an optical signal containing a time jitter and a time-varying distortion caused by a periodic polarization scrambled signal comprises at least one decision gate ( 11 ) and a...
7486895 Effective control algorithm for optical polarization mode dispersion compensators  
The present invention includes apparatus and method of a variable step size dithering control algorithm for polarization mode dispersion controllers (PMDCs). The dithering step size of the PCs is...
7483642 Receiver for OTDM/PDM optical signals  
A receiver for an OTDM/PDM pulse train ( 10 ) in which the pulses ( 12 ) have alternating polarizations (P 1, P 2 ) has a polarization insensitive optical switch ( 16; 161, 162, 163, 164 ) for...
7483638 Optical transceiver  
The present invention provides an optical transceiver that enables to reduce the crosstalk from the optical transmitter to the optical receiver. The regenerator of the optical transceiver includes...
7477848 Optical receiving apparatus and method for controlling the optical receiving apparatus  
An optical receiving apparatus sets, efficiently and optimally, a delay interferometer and a variable wavelength dispersion compensator in the apparatus. The apparatus has a variable dispersion...
7477109 Process and temperature-compensated transimpedance amplifier  
An optical receiver is disclosed that exhibits an improved phase margin and substantially constant output in response to changes in operating conditions (e.g., temperature, process, etc.). In...
7474860 Optimum sample spacing in over-sampled maximum likelihood sequence estimation receivers  
In an over-sampled maximum-likelihood sequence estimation (MLSE) receiver system, the optimal sample spacing is determined for a variety of conditions. In an illustrative implementation, the system...
7466930 Optical receiver module and optical receiver module system  
A relation between a light input power monitor value of an optical transmission signal before passing through a fiber and an input signal amplitude monitor value is recorded in advance in a storage...
7466929 Method and system for superheterodyne detection of an optical input signal  
A system and method for superheterodyne detection in accordance with the invention. The system comprises a first conversion unit for performing a first heterodyne operation on an optical input...
7466928 Optical receiver with dynamic gain and bandwidth  
The present invention provides an optical receiver applicable to various transmission rates. The optical receiver of the invention includes a main amplifier and a switching unit. The main amplifier...
7466923 Polarization mode dispersion compensation  
Methods and systems for PMD compensation in an optical communication system are implemented by transmitting multiple optical signals through a common optical conduit to an optical compensator that...
7460792 Receiving circuit and electronic apparatus for optical communication  
In an optical communication-use receiving circuit of the present invention, the pulse width of the received pulse which is a binary signal corresponding to the signal optical pulse is specified by...
7460788 Transmitting and receiving device  
A transmitting and receiving device, in which the received signal which is produced by the receiving device has only a small amount of crosstalk. This object is achieved by providing a transmitting...
7457542 Optical access network system  
An optical access network system having a function of correcting upstream signal waveform distortions occurring in the PON section, wherein a central office side apparatus comprises a main...
7450856 Dispersion compensating method and dispersion compensating apparatus  
A dispersion compensating method for compensating wavelength dispersion occurring in an optical transmission line, includes the steps of: a) performing dispersion compensation by causing an optical...
7424228 High dynamic range radio frequency to optical link  
A communication system includes an optical transmitter which is differentially driven and an optical receiver that outputs a differential signal. The optical transmitter creates the differential...
7421213 Optical receiver control device with a switchable bandwidth  
A control device with a switchable bandwidth including: an integrating element with a first capacitance, which is charged and discharged by at least one current; at least one second capacitance,...
7421212 Detecting and locating pulses using a Bragg cell  
Detecting a pulse of a signal includes receiving the signal and a light beam. The signal drives a spatial light modulator to modulate the light beam, where the complex amplitude of the modulated...
7418212 Electrical detection of optical symbols  
A system and method for detecting digital symbols carried in a received optical signal. The system comprises a functional element operative to receive a stream of samples of an electrical signal...
7415213 Optical receiver having transient compensation  
An optical receiver having compensation for signal level transients. The receiver includes an OE converter, a transient threshold compensator, a threshold combiner and a CDR system. The OE...
7414234 Measurement of burst mode optical power over multiple bursts  
A system, method, and computer readable medium for measurement of burst mode optical power over multiple bursts, comprises mirroring a photodiode current of an optical signal burst, converting the...
7411726 Multi-channel differentially encoded phase shift keyed receivers  
An optical, multi-channel, Differential Phase Shift Keying (DPSK) receiver demodulates multiple Wavelength Division Multiplexed (WDM) channels using at least one interferometer. This distributes...
7406268 Optical receiver circuit  
An optical receiver circuit is constructed to be immune to interference from external interference signals. The optical receiver circuit includes a differential amplifier having an optical...
7406263 Combined wavefront sensor and data detector for a free space optical communications system with adaptive optics  
In an adaptive optics module, wavefront sensing and data detection are implemented in a single device. For example, an optical-to-electrical converter converts a data-encoded optical beam to an...
Matches 1 - 50 out of 189 1 2 3 4 >