Class 398/209 - Feedback

Subclass of Class 398 - Optical communications
Definition: Su bject matter in which at least a portion of the
No. of applications: 28
Last issue date: 01/19/2012

Application No.	Application Title	Issue Date
20120014699	SYNCHRONIZING PHASES OF MULTIPLE OPITCAL CHANNELS A system may include one or more devices that may be used to simultaneously measure and modulate phases of a many-channel optical system relative to a high frequency optical carrier. This device may be constructed using analog-to-digital converters, comparators, and dis...	01/19/2012
20110236025	SUB-RATE SAMPLING IN COHERENT OPTICAL RECEIVERS Apparatus and methods for optimizing the interplay between the sampling rate of an ADC of a receiver system and a bandwidth of analog anti-aliasing filters are described. The described technology can be used to mitigate aliasing for receiver systems that operate at frac...	09/29/2011
20110170881	LIGHT RECEIVING DEVICE AND LIGHT RECEIVING METHOD A light receiving device includes: a converter digitalizing an analog signal with a given sampling clock frequency, the analog signal being obtained through a photoelectric conversion of a received optical signal; a plurality of fixed distortion compensators compensatin...	07/14/2011
20110135315	OPTICAL RECEIVER WITH A CALIBRATION MODE An optical receiver is described. This optical receiver includes a digital feedback circuit that biases a front-end circuit, which receives an optical signal, so that an analog electrical signal output by the front-end circuit is calibrated relative to a reference volta...	06/09/2011
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,...	12/23/2010
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 ...	09/16/2010
20090310979	ELECTRONIC CIRCUIT AND COMMUNICATION SYSTEM An electronic circuit includes: a differential amplifier circuit into which a digital input signal and a reference signal are fed; a feedback circuit outputting an average of amplitude of the input signal; and a peak holding circuit outputting a signal held based on an ...	12/17/2009
20090232519	OPTICAL RECEIVER FOR REGENERATION OF OPTICAL SIGNAL An optical receiver includes: a converting unit that converts an optical signal into an electrical signal; an amplifying unit that amplifies the electrical signal; a regenerating unit that regenerates the amplified electrical signal; a correcting unit that performs corr...	09/17/2009
20090214203	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 portion, which are optically interfered to generate at least one interfe...	08/27/2009
20090208223	FOUR WAVE MIXING SUPPRESSION Methods, systems and computer program products for countering the effects of four wave mixing are described. In one implementation, a controller can be used to shift an operating wavelength of an optical transmitter away from a zero-dispersion wavelength through which s...	08/20/2009
20090103932	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 coupling network is electrically communicated with the optical-electrical s...	04/23/2009
20090087197	METHOD AND SYSTEM FOR SPLIT VOLTAGE DOMAIN RECEIVER CIRCUITS Methods and systems for split voltage domain receiver circuits are disclosed and may include amplifying complementary received signals in a plurality of partial voltage domains. The signals may be combined into a single differential signal in a single voltage domain. Ea...	04/02/2009
20090080906	Frequency offset monitoring device and optical coherent receiver The present invention provides a frequency offset monitoring device and an optical coherent receiver. A low speed frequency offset monitoring device comprises a signal speed lowering section, for lowering the speed of an inputted signal and outputting the speed lowered ...	03/26/2009
20080205907	OPTICAL RECEIVER, OPTICAL AUDIO APPARATUS, OPTICAL COMMUNICATION APPARATUS AND OPTICAL RECEPTION METHOD An optical receiver with a threshold voltage convergence and audio apparatus and communication apparatus using the optical receiver are provided. The optical receiver of the present invention includes an optical detector for converting a received optical signal to a cur...	08/28/2008
20080152358	LIGHT RECEIVER A light receiver has a photoelectric conversion circuit which converts an input optical signal into an electrical signal, an electric amplifier which amplifies the electrical signal output from the photoelectric conversion circuit, a threshold adjustment circuit which o...	06/26/2008
20080101803	High dynamic range optical receiver An optical receiver having a photodetector, amplifier, feedback loop, and output circuit is disclosed. The photodetector generates a current between first and second nodes in response to being illuminated with light. The amplifier has an input connected to the first nod...	05/01/2008
20080056733	Phase monitor used in optical receiver Branches are grouped into a group 1 including first and second branches, and a group 2 including third and fourth branches. The signal after being passed through a dual pin photodiode in one branch included in the group 1 and being at the earlier st...	03/06/2008
20080025733	OPTICAL DIFFERENTIAL PHASE SHIFT KEYING RECEIVERS WITH MULTI-SYMBOL DECISION FEEDBACK-BASED ELECTRO-OPTIC FRONT-END PROCESSING Novel differential-phase shift keying optical receivers are taught based on multi-symbol differential phase shift keying detection (DPSK) aided by decision feedback (DF) from the decision bits in earlier symbol intervals. In accordance with the invention, the DF is dire...	01/31/2008
20070086792	Data receiver with positive feedback A data communication device adapted to receive a data stream includes positive feedback. The positive feedback allows the data communication device to operate with a bi-stable operating characteristic. Consequently the data communication device exhibits superior rejecti...	04/19/2007
20070081827	Optical receiver for regeneration of optical signal An optical receiver includes: a converting unit that converts an optical signal into an electrical signal; an amplifying unit that amplifies the electrical signal; a regenerating unit that regenerates the amplified electrical signal; a correcting unit that performs corr...	04/12/2007
20070058989	In-situ power monitor providing an extended range for monitoring input optical power incident on avalanche photodiodes Disclosed are an in-line monitoring apparatus, an optical receiver and a method for monitoring an input power of an optical signal in which one or more power monitoring stages, for example can measure the input power over an extended input power range. In one embodiment...	03/15/2007
20060280511	Optical receiver having bias circuit for avalanche photodiode with wide dynamic range An optical receiver is provided as a device capable of detecting a small optical power with satisfactory accuracy and detecting the optical power in a wide dynamic range. In the optical receiver a bias generator applies a variable voltage to an avalanche photodiode (APD...	12/14/2006
20060251429	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 coupling network is electrically communicated with the optical-electrical s...	11/09/2006
20060216042	Automatic gain control circuit for infrared receiver An optical receiver includes a photodetector coupled to a gain section having a variable gain stage. The gain stage provides an output voltage signal. A digital automatic gain control circuit is coupled to the output voltage signal and provides a digital output value to...	09/28/2006
20060067713	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 accordance with the illustrative embodiment, a common-mode feedback comparison...	03/30/2006
20060051104	Receiving error rate control device A reception error rate controller in which the settling time can be shortened at the time of feedback control by controlling the quality of a received signal when the error rate is low. The reception error rate controller identifies the received signal by comparing it w...	03/09/2006
20050169647	Receiving apparatus, transmitting apparatus, and communication system A receiving apparatus and transmitting apparatus capable of reliably transmitting and receiving a high speed optical signal and a communication system using the same, wherein provision is made of a transmitting apparatus comprising a conversion circuit for converting se...	08/04/2005
20050095013	Optical receiving device An optical receiving device. The optical receiving device has a photodiode, transimpedance amplifier, and a feedback component. The photodiode has a first terminal coupled to a voltage source and a second terminal. When detecting an optical signal, the photodiode genera...	05/05/2005

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Class 398/209 - Feedback