Class 398/206 - Having feedback

Subclass of Class 398 - Optical communications
Definition: Subject matter in which at least a portion of heterodyned
No. of patents: 37
Last issue date: 12/27/2011

Number	Title	Issue Date
8086113	Optical receiver An optical mixing part mixing a received optical signal and local oscillator light in at least two kinds of phases and extracting at least two-system optical signals corresponding to each light phase; a photoelectric conversion part converting the at least two-syste...	12/27/2011
7936999	Automatic gain control in a coherent optical receiver In a coherent optical receiver, a method of at least partially compensating Polarization Dependent Loss (PDL) of an optical signal received through an optical communications system. A respective multi-bit sample stream of each one of a pair of orthogonal received po...	05/03/2011
7769305	High-speed digital signal processing in a coherent optical receiver In a coherent optical receiver, a frequency domain engine digitally processes at least two multi-bit sample streams of a received optical signal. The frequency domain engine includes a Fast Fourier Transform (FFT) filter for computing a complex vector representative...	08/03/2010
7747177	Coherent phase-shift-keying A receiver for coherent detection of a PSK modulated optical carrier includes an optical detector, digital-to-analog converters, and a digital module. The optical detector is configured to mix the modulated optical carrier with two phase components of a reference op...	06/29/2010
7650084	Optical heterodyne receiver and method of extracting data from a phase-modulated input optical signal An optical heterodyne receiver and a method of extracting data from a phase-modulated input optical signal. In one embodiment, the optical heterodyne receiver includes: (1) a photonic quadrature demodulator having first and second optical inputs and first and second...	01/19/2010
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 converter receives the incoming optical signal and provides a modulated elect...	08/19/2008
7406269	Feedback-controlled coherent optical receiver with electrical compensation/equalization An optical coherent receiver in one embodiment has a heterodyne configuration, and in another embodiment has a homodyne configuration, in each configuration employs multiple feedback signaling and analog/digital processing to optimize response to a modulated optical...	07/29/2008
7394994	Optical receiver circuit An optical receiver circuit comprising an optical converter circuit (38), comprising a photodiode and converting optical power into electrical power, a sensor circuit for deriving a control voltage VCONTR as a characteristic value of the electrical power outp...	07/01/2008
7389055	DQPSK receiver phase control An optical receiver for receiving an optical differential phase shift keyed signal has an optical component sensitive to the optical phase of the signal, such as an interferometer, a device arranged to generate a control signal by non linear limiting of an output of...	06/17/2008
7373091	Multicasting optical switch fabric and method of detection based on novel heterodyne receiver The inventors propose herein a switch fabric architecture that allows broadcasting and fast channel access in the ns-range. In various embodiments of the present invention, 10 Gb/s receiver modules are based on a novel heterodyne receiver and detection technique, wh...	05/13/2008
7343100	Optical communications based on optical polarization multiplexing and demultiplexing This application describes techniques for optical multiplexing and demultiplexing in optical communication systems based on polarization multiplexing of different signal channels. ...	03/11/2008
7324760	Apparatus and method for phase synchronization control in RZ optical transmitter An optical RZ transmitter comprises an optical signal source and a pair of electro-optical modulators in tandem, one arranged to receive a NRZ electrical data signal and the other a clock signal at the data rate of the data signal. The phase difference between the d...	01/29/2008
7313333	Apparatus for controlling decision threshold voltage to optical receiver Disclosed herein is an apparatus for controlling a decision threshold voltage to an optical receiver, which is capable of automatically controlling the decision threshold voltage to the optical receiver appropriately to signal level decision on the basis of a low-fr...	12/25/2007
7295781	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 adjustably rotates the polarization states of the multiple optical si...	11/13/2007
7254345	Receiver and receiving method capable of detecting an eye aperture size formed by reception data signals In a receiver operable in response to a data signal, an eye aperture size is detected along a time axis by an eye aperture detection circuit and is controlled by a control circuit so that it becomes a maximum. The eye aperture detection circuit determines different ...	08/07/2007
7224908	Attenuation and calibration systems and methods for use with a laser detector in an optical communication system Systems and methods for use with an optical communication beam are disclosed. The system allows the beam of light to operate at an adequate power level that provides a robust optical link while minimizing any safety risk to humans. The system calibrates and controls...	05/29/2007
7206522	Dynamic measurement of and compensation for impairments to optical data communication pulses A photomultiplier module (PMT), preferably a PMT with a gallium arsenide (GaAs) photocathode, is used as a N-photon detector (N is an integer ≧2). The PMT detects the N-photon absorption rate of an optical signal having a wavelength range extending from 1.0 μm to...	04/17/2007
7206521	Signal level detecting device for a burst-mode optical receiver In an optical receiver having a pre-amplifier for converting a current signal outputted from an optical detector to a voltage signal, a signal level detecting device is provided to provide an LOS (loss of signal) signal and a reset signal from the output of the pre-...	04/17/2007
7174099	System for regulating optical output power Systems and methods for regulating optical power are described. A system for regulating optical power includes a laser driver circuit that receives an enable/disable signal and a data modulator input. The enable/disable signal regulates asynchronous mode operation. ...	02/06/2007
7146108	Optical transmission system for compensating for transmission loss An optical transmission system for compensating for transmission loss includes a transmitting apparatus for serializing a plurality of n (n is a natural number)-bit channel data received from the outside in response to a predetermined clock signal, converting the se...	12/05/2006
7130543	Bit rate-independent optical receiver A bit rate-independent optical receiver ensures transparency with respect to changes of the transmission format and its associated bit rate in relation to an optical communications system. The optical receiver includes an opto-electric converter for converting an in...	10/31/2006
7103276	Optical band scanning monitor system and method A scanning optical monitoring system and method are appropriate for high speed scanning of a WDM signal band. The system and method are able to identify dropped channels or, more generally, discrepancies between the determined or detected channel inventory and a per...	09/05/2006
7095963	Multi-channel optical receiver for processing tri-cell polarization diversity detector outputs An optical receiver system for processing signals output from a polarization diversity detector that includes a plurality of photodetector cells. Each cell provides an signal that includes a phase generated carrier signal having a modulation frequency ω and a senso...	08/22/2006
7092630	Open fiber control for optical transceivers The present invention implements open fiber control in an optical transceiver. During normal operation, the transceiver transmits signals through a connection to an optical network. When the connection is intact, the total power transmitted can be greater than the e...	08/15/2006
6999688	Optical systems with diversity detection A receiver system processes a received optical signal that carries user information. The receiver system includes a splitter, a first converter, a second converter, and a detection system. The splitter splits the received optical signal based on polarization into a ...	02/14/2006
6980747	Optically amplified receiver An integrated, optically amplified receiver includes an optically pumped optical preamplifier for receiving, generally, wavelength division multiplexed optical communication signal over an optical communications line. A PIN photodetector receives the optical communi...	12/27/2005
6963697	Increased transmission capacity for a fiber-optic link A method of decoding a signal in an optical fiber. In one embodiment the method includes receiving the optical signal, wherein the optical signal is a pulse amplitude modulated signal. Converting the optical signal to an electrical signal. Comparing the electrical s...	11/08/2005
6941079	Optical demultiplexer with multi-channel power control and tilt compensation Systems and methods for controlling power of WDM channels in a WDM receiver. A preamplifier is provided prior to a demultiplexer in the WDM receiver chain. The gain of the preamplifier may be controlled based on power measurements made on individual WDM channels. A ...	09/06/2005
6941081	Method and apparatus for polarization measurements A method and apparatus for polarization measurements. A polarization state of an optical signal can be determined using a polarization analyzer comprising a polarization controller, a polarizer, a wavelength dispersive element and a photo-detector. The method and ap...	09/06/2005
6901225	Device for detecting polarization mode dispersions A device is provided for detecting polarization mode dispersion of an optical data signal, wherein the device includes at least two filters, each of which is respectively followed by a power detector. A better compensation can ensue due to the combination of a large...	05/31/2005
6885828	Optical signal receiver and method with decision threshold adjustment based on a total percentage error indicator field of the invention An optical receiver configuration and method of controlling an optical signal receiver adjusts a decision threshold to reduce the bit error rate (BER). The receiver includes a comparator having a data input and a digital data output. An error detection & correction ...	04/26/2005
6834165	Parallel opto-electric structure for high sensitivity and wide bandwidth optical transceiver An optical receiver circuit including a plurality of PIN diodes, each associated with a dedicated element transimpedance amplifier, the outputs of the element transimpedance amplifiers being connected to a summing amplifier which sums the voltages output from the el...	12/21/2004
6795657	Circuit and method for monitoring optical signal level A circuit for monitoring an optical signal level provided in an optical receiver includes a clock extraction circuit, a noise detection circuit, and an alarm circuit. The clock extraction circuit extracts a clock from an input signal. The noise detection circuit mul...	09/21/2004
6744964	System and method for controlling variable optical attenuators System for adjusting a power level of an optical signal at an input to a component in a network element that forms part of an optical network. The system includes a variable optical attenuator (VOA) for receiving a first optical input signal and producing an attenua...	06/01/2004
6738582	Synchronization system for all optical slotted ring dynamic networks A method for communicating data over a network having a plurality of nodes thereupon is discussed. A time slot clock signal is transmitted from one node of the plurality of nodes to other nodes of the plurality of nodes. After each of the other nodes of the pluralit...	05/18/2004
6201621	Optical regeneration for optical-fiber transmission systems for non-soliton signals A method of regenerating non-soliton RZ optical signals, the method including the steps of: a compression step, whereby the RZ signals are compressed into soliton-type signals; a modulation step whereby synchronous optical modulation is performed on the s...	03/13/2001
6043921	Fading-free optical phase rate receiver A method and optical system for fading-free reception of optical phase sils having temporally varying polarization, phase and phase frequency is provided. Two orthogonally polarized local oscillators light waves of different frequencies are utilized to p...	03/28/2000

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Class 398/206 - Having feedback