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| Number | Title | Issue Date |
| 8170425 | Optical signal receiving circuit To solve problematic trade-off between a bandwidth and a in-band deviation in an optical signal receiving circuit of a gigabit order that is required to have a wide dynamic range, the optical signal receiving circuit has a current-voltage conversion circuit that rec... | 05/01/2012 |
| 8165478 | Optical receiver An optical receiver of wide-dynamic range characteristic that stably reproduces a burst signal having different light receiving levels. A preamplifier converts an output from a light receiving element into a voltage signal. A level detecting circuit includes: a firs... | 04/24/2012 |
| 8155538 | Technique for calibrating and centering an optical receiver A technique for calibrating an optical receiver is described. During this technique, a front-end circuit in the optical receiver receives an optical signal that corresponds to a sequence with alternating groups of symbol types that correspond to binary values, where... | 04/10/2012 |
| 8145071 | Electrical-dispersion compensating apparatus, optical receiving apparatus, and optical receiving method An optical receiving apparatus branches an optical signal, photo-electric-converts the branched signals, and compensates dispersion in each of the converted electrical signals. Electrical-dispersion compensators respectively compensate the dispersion in the electric... | 03/27/2012 |
| 8078066 | Optical coherent receiver, frequency offset estimating apparatus and method for optical coherent receiver The present invention discloses an optical coherent receiver, and a frequency offset estimating apparatus and a frequency offset estimating method for use in the optical coherent receiver. The optical coherent receiver includes a front end processing section for cha... | 12/13/2011 |
| 8059973 | Discrete bootstrapping in an optical receiver to prevent signal feedback An optical receiver assembly that is configured to avoid the introduction of feedback in an electrical signal converted by the assembly is disclosed. In one embodiment, an optical receiver assembly is disclosed, comprising a capacitor, an optical detector provided w... | 11/15/2011 |
| 8055138 | Photosensor operating point The subject matter disclosed herein relates to determining a photosensor operating point. ... | 11/08/2011 |
| 7991302 | Method and apparatus for optical signaling A method and apparatus for optical signaling. In one embodiment, a laser driver converts a digital voltage sequence to a current signal having a bias mode adjustable by a bias control and a modulation mode adjustable by a modulation control. A laser generates an opt... | 08/02/2011 |
| 7899340 | Laser control in a coherent optical receiver Methods and systems for compensating a frequency mismatch Δf between a local Oscillator (LO) of a coherent optical receiver and a carrier of a received optical signal. An average frequency of the LO is controlled to compensate at least long-period variations of the... | 03/01/2011 |
| 7877025 | Phase monitor apparatus, phase control apparatus and methods thereof for optical DQPSK receiver I branch is provided with a first interferometer, a first balanced optical detector, and a first data recovery circuit. Q branch is provided with a second interferometer, a second balanced optical detector and a second data recovery circuit. In I branch, a mixer mul... | 01/25/2011 |
| 7869719 | 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 int... | 01/11/2011 |
| 7840145 | Apparatus and methods for noise-feedback controlled optical systems Apparatus and methods for noise-feedback controlled optical systems are disclosed. In one aspect, an apparatus includes a receiver adapted to receive an optical signal and to convert the optical signal to a corresponding electrical signal, and a control circuit coup... | 11/23/2010 |
| 7817925 | High-speed dispersion compensation control apparatus An optical signal, which is a low-speed signal superimposed on a high-speed phase modulated optical signal by intensity modulation, is used. In an optical receiver apparatus 40, a received signal is split, and one of the split signals is O/E converted and low... | 10/19/2010 |
| 7813655 | Signal waveform deterioration compensator The waveform deterioration detection range is broadened and multi bit rates can be handled. A chromatic dispersion compensator (or polarization mode dispersion compensator) (102) receives a waveform-deteriorated NRZ optical signal entered through an input fib... | 10/12/2010 |
| 7809286 | 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 ... | 10/05/2010 |
| 7809285 | Receiving circuit and optical signal receiving circuit A receiving circuit comprises a transimpedance amplifier 3 including an inversion amplifier 2 for amplifying an input current IN, and a feedback resistance R1 connected between an input and an output of the inversion amplifier 2, a compar... | 10/05/2010 |
| 7805085 | Optical reception apparatus An optical reception apparatus according to the present invention comprises: a branching section that branches an optical signal input thereto into two; first and second delay interferometers arranged on optical paths through which the branched lights are propagated... | 09/28/2010 |
| 7761013 | 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 ... | 07/20/2010 |
| 7693430 | 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-electric... | 04/06/2010 |
| 7653318 | Photonic phase locked loop detector/discriminator Disclosed is a Photonic Phase Locked Loop (PPLL) detector/discriminator, which makes possible a system for optically transmitting electromagnetic signals through a transmission medium (such as optical fiber, optical waveguide, underwater, in biological tissue, or in... | 01/26/2010 |
| 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 optical signal. A second optical delay element is configured to generate ... | 11/24/2009 |
| 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. Indication of the BER to a control loop adapted is provided to adjust t... | 10/27/2009 |
| 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 portion, which are optically interfered to generate at least one int... | 10/13/2009 |
| 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 coupling network is electrically communicated with the optical-electric... | 10/06/2009 |
| 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 electrical signals by avalanche photodiodes (APDs) at the node receivers. An... | 09/22/2009 |
| 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 integrated for multiple signal channels on the same semiconductor chip is... | 08/11/2009 |
| 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 of N separate channels. The algorithm block embodies a specific algori... | 08/04/2009 |
| 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 the DC current load, the power measurement circuitry and the upstream d... | 06/30/2009 |
| 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 received optical signal. In one embodiment, the decision set point may be ... | 04/21/2009 |
| 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. The receiver includes a continuous time filter having an adjustable ... | 04/21/2009 |
| 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 configured to generate an output optical signal by phase modulation and/or... | 02/24/2009 |
| 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 indication (RSSI) pin, or rate-adaptively adjusts the bandwidth of optical rec... | 02/17/2009 |
| 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 clock recovery module (13) providing a clock signal (... | 02/03/2009 |
| 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 device. Next, actual optical-transmission-waveform is inputted into ... | 12/16/2008 |
| 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 drive signal from an input signal and delivers the differential drive s... | 09/09/2008 |
| 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, which can be connected in parallel with the first capacitance via a fir... | 09/02/2008 |
| 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 light beam is proportional to the signal current. The modulated light b... | 09/02/2008 |
| 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 derived from the received optical signal and to evaluate a non-linear f... | 08/26/2008 |
| 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 |
| 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 mirrored photodiode current to a capacitor voltage, comparing the cap... | 08/19/2008 |
