Receiver Patents (Class 398/202)
  • Patent number: 11335768
    Abstract: A semiconductor device comprises a semiconductor die and an integrated capacitor formed over the semiconductor die. The integrated capacitor is configured to receive a high voltage signal. A transimpedance amplifier is formed in the semiconductor die. An avalanche photodiode is disposed over or adjacent to the semiconductor die. The integrated capacitor is coupled between the avalanche photodiode and a ground node. A resistor is coupled between a high voltage input and the avalanche photodiode. The resistor is an integrated passive device (IPD) formed over the semiconductor die. A first terminal of the integrated capacitor is coupled to a ground voltage node. A second terminal of the integrated capacitor is coupled to a voltage greater than 20 volts. The integrated capacitor comprises a plurality of interdigitated fingers in one embodiment. In another embodiment, the integrated capacitor comprises a plurality of vertically aligned plates.
    Type: Grant
    Filed: April 5, 2019
    Date of Patent: May 17, 2022
    Assignee: Semtech Corporation
    Inventor: Christopher David Ainsworth
  • Patent number: 11323185
    Abstract: Methods and systems for waveguide delay based equalization summing at single-ended to differential converters in optical communication are disclosed and may include: in an photonic circuit including a directional coupler, photodetectors, and a gain stage, receiving an input optical signal; splitting the input optical signal into first and second optical signals using the directional coupler; generating a first current from the first optical signal using a first photodetector; communicating the first voltage to a first input of the gain stage; generating a second current from the second optical signal using a second photodetector; communicating the second voltage to a second input of the gain stage; and generating a differential output voltage based on the first and second currents using the gain stage.
    Type: Grant
    Filed: October 7, 2019
    Date of Patent: May 3, 2022
    Assignee: Cisco Technology, Inc.
    Inventors: Simon Pang, Joseph Balardeta
  • Patent number: 11323183
    Abstract: Examples described herein relate to an analog front-end (AFE). The AFE includes a trans-impedance amplifier to receive an input current and generate a pair of the differential voltage signals based on the input current and a reference current. Further, the AFE includes a dynamic voltage slicer to receive the differential voltage signals at input terminals and supply digital voltages at output terminals. The dynamic voltage slicer includes a preamplifier to generate a pair of intermediate voltages based on the differential voltage signals sampled at a predetermined frequency. The dynamic voltage slicer also includes a voltage latch circuit coupled to the preamplifier, wherein the voltage latch circuit is to regenerate a pair of digital voltages based on the pair of the intermediate voltages. Moreover, the AFE includes a logic latch coupled to the dynamic voltage slicer to provide digital output states based on the pair of the digital voltages.
    Type: Grant
    Filed: November 5, 2020
    Date of Patent: May 3, 2022
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Tsung Ching Huang, Jinsung Youn
  • Patent number: 11258594
    Abstract: A passive continuous-variable quantum key distribution scheme, where Alice splits the output of a thermal source into two spatial modes, measures one locally and transmits the other mode to Bob after applying attenuation. A secure key can be established based on measurements of the two modes without the use of a random number generator or an optical modulator.
    Type: Grant
    Filed: November 21, 2018
    Date of Patent: February 22, 2022
    Assignee: UT-Battelle, LLC
    Inventors: Bing Qi, Philip G. Evans, Warren P. Grice
  • Patent number: 11258519
    Abstract: A quantum receiver for decoding an optical signal includes a beamsplitter for interfering the optical signal with a local-oscillator field to generate a displaced field, and a single-photon detector for detecting the displaced field. The quantum receiver also includes a signal-processing circuit for determining, based on an electrical output of the single-photon detector, a measurement outcome. The signal-processing circuit also determines, based on the measurement outcome and a feed-forward machine-learning model, a next displacement. The quantum receiver also includes at least one modulator for modulating, based on the next displacement, one or both of the optical signal and the local-oscillator field. Like a Dolinar receiver, the quantum receiver implements adaptive measurements to reduce the error probability of the decoded symbol. The use of machine-learning reduces the latency of the signal-processing circuit, thereby increasing the number of measurements that may be performed for each received symbol.
    Type: Grant
    Filed: March 2, 2021
    Date of Patent: February 22, 2022
    Assignee: Arizona Board of Regents on Behalf of the University of Arizona
    Inventors: Zheshen Zhang, Chaohan Cui, Quntao Zhuang, William Horrocks
  • Patent number: 11228369
    Abstract: A sampling frequency required for symbol timing recovery is made smaller than that of the related art. A receiver 1 performs visible light communication with a transmitter 8. A received signal generating unit 112 measures an intensity of an electrical signal corresponding to an optical signal received from a transmitter 8 at a predetermined time interval to generate a sequence of received signals. A parameter estimation unit 12 uses a distribution of received signals estimated from the sequence of received signals to estimate any one or more parameters of a maximum luminance value, a synchronization shift, and a steady noise level, the one or more parameters including at least the maximum luminance value.
    Type: Grant
    Filed: August 8, 2019
    Date of Patent: January 18, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yoshifumi Shiraki, Takehiro Moriya, Yutaka Kamamoto, Takashi Sato
  • Patent number: 11223334
    Abstract: Disclosed herein are transimpedance circuits, as well as related methods and devices. In some embodiments, a transimpedance circuit may include a current source bias terminal, a current source output terminal, and a transimpedance amplifier coupled to the current source output terminal, wherein voltage signals at the current source bias terminal are correlated with voltage signals at the current source output terminal. In some embodiments, the current source may be a photodiode.
    Type: Grant
    Filed: March 18, 2020
    Date of Patent: January 11, 2022
    Assignee: ANALOG DEVICES INTERNATIONAL UNLIMITED COMPANY
    Inventors: Jinhua Ni, Wei Wang, Hui Shen
  • Patent number: 11223337
    Abstract: A logarithmic power detector includes a power distributor, a first detection circuit, a second detection circuit and an output circuit. The power distributor is used to generate a first power signal and a second power signal according to an input signal. The first detection circuit is used to attenuate the first power signal to generate a first rectified signal, filter the first rectified signal to generate a first low-pass signal, and amplify the first low-pass signal to generate a first amplification current. The second detection circuit is used to attenuate the second power signal to generate a second rectified signal, filter the second rectified signal to generate a second low-pass signal, and amplify the second low-pass signal to generate a second amplification current. The output circuit is used to receive the first amplification current and the second amplification current to generate a converted voltage related to the input signal.
    Type: Grant
    Filed: August 11, 2020
    Date of Patent: January 11, 2022
    Assignee: RichWave Technology Corp.
    Inventors: Hwey-Ching Chien, Chun-Han Tai
  • Patent number: 11218217
    Abstract: Consistent the present disclosure, a network or system is provided in which a hub or primary node may communication with a plurality of leaf or secondary nodes. The hub node may operate or have a capacity that may be greater than that of the leaf nodes. Accordingly, relatively inexpensive leaf nodes may be deployed that receive data carrying optical signals from and supply data carrying optical signals to the hub node. One or more connections may couple each leaf node to the hub node, whereby each connection may include one or more spans or segments of optical fibers, optical amplifiers, and optical add/drop multiplexer, for example. Consistent with an aspect of the present disclosure, optical subcarriers may be transmitted over such connections. The subcarriers may be generated by a combination of a laser and a modulator, such that multiple lasers and modulators are not required, and costs may be reduced.
    Type: Grant
    Filed: March 4, 2020
    Date of Patent: January 4, 2022
    Assignee: Infinera Corporation
    Inventors: Amir Jafari, David F. Welch, Steven Joseph Hand, Mohamed Osman
  • Patent number: 11206157
    Abstract: A calibration method of an equalizer circuit for a memory storage device is disclosed. The calibration method includes: receiving a first signal; adjusting, by the equalizer circuit, the first signal according to a control parameter to output a second signal; generating a first sampling signal according to a first reference signal and the second signal, wherein the first sampling signal reflects data transmitted by the first signal; and generating a second sampling signal according to a second reference signal and the second signal and adjusting the control parameter according to the second sampling signal to calibrate the equalizer circuit, wherein a voltage value of the first reference signal is different from a voltage value of the second reference signal.
    Type: Grant
    Filed: October 12, 2020
    Date of Patent: December 21, 2021
    Assignee: PHISON ELECTRONICS CORP.
    Inventors: Zhen-Hong Hung, Sheng-Wen Chen, Shih-Yang Sun
  • Patent number: 11188108
    Abstract: A data acquisition system may include an input for receiving an input signal for the data acquisition system, a plurality of data paths including a first data path and a second data path, and a signal estimator configured to determine a magnitude of the input signal using estimation of the input signal and dynamically deactivate one of the first and second data paths based on the magnitude of the input signal.
    Type: Grant
    Filed: August 4, 2020
    Date of Patent: November 30, 2021
    Assignee: Cirrus Logic, Inc.
    Inventors: Sunder Kidambi, Mohit Sood, Roderick D. Holley, John C. Tucker
  • Patent number: 11146334
    Abstract: System and method for fiber-optic time frequency and data joint transmission, comprising local end, relay nodes, and remote end. In each local end, relay node, and remote end, multiplexing and demultiplexing of time frequency signals, optical supervisory signals, and optical communication data services are performed by CWDM modules and OSC-band wavelength multiplexer/demultiplexers, and processing (transmitting, relaying, receiving) is performed by corresponding processing modules for joint transmission. A sub-band of standard OSC band is used for transmitting time frequency signal so that transmission of optical supervisory signal is not influenced while no extra band resource is occupied with improved utilization of wavelength resources and reduced costs.
    Type: Grant
    Filed: September 30, 2020
    Date of Patent: October 12, 2021
    Assignee: Shanghai Jiao Tong University
    Inventor: Guiling Wu
  • Patent number: 11128390
    Abstract: A test system and interface circuitry for antenna-free bit error rate testing of an electronic device under test, including a pulse shaping circuit with a pulse shaping filter circuit to pulse shape a modulating signal before amplitude modulation with a carrier signal, and the amplitude modulated signal is coupled directly or via a transformer and a socket to the device under test without antennas to facilitate automated device testing with simple reconfiguration of signal generators for different device type. A method includes filtering a square wave modulating signal to create a pulse shaped modulating signal, amplitude modulating a carrier signal with the pulse shaped modulating signal to create an amplitude modulated signal, providing the amplitude modulated signal to the socket, and evaluating a bit error rate of the DUT according to receive data from the DUT and according to the BER test transmit data.
    Type: Grant
    Filed: July 15, 2020
    Date of Patent: September 21, 2021
    Assignee: Texas Instruments Incorporated
    Inventors: Kiran Rajmohan, Kalyan Chakravarthi Chekuri
  • Patent number: 11128383
    Abstract: Embodiments herein disclose receiver of coherent optical communication link and method of compensating carrier phase offset in receiver. 90° optical hybrid is configured to receive input of reference optical carrier (LO) signal and modulated optical signal (S) and carrier phase offset detection block is configured to generate output signal representing average of the phase offset at the input of the carrier phase offset detection block. Electronic control unit configured to receive output signals from the carrier phase offset detection block for generating control signals and tunable phase delay block configured to receive the control signals from the electronic control unit. 90° optical hybrid, carrier phase offset detection block, electronic control unit and the tunable phase delay block are configured in feedback loop, such that outputs of the carrier phase offset detection block are used for tuning the phase delay of the tunable phase delay block to achieve carrier phase synchronization.
    Type: Grant
    Filed: November 13, 2019
    Date of Patent: September 21, 2021
    Assignee: Indian Institute of Technology Bombay
    Inventors: Shalabh Gupta, Rakesh Ashok
  • Patent number: 11119385
    Abstract: A system for generating clock signals for a photonic quantum computing system includes a pump photon source configured to generate a plurality of pump photon pulses at a first repetition rate, a waveguide optically coupled to the pump photon source, and a photon-pair source optically coupled to the first waveguide. The system also includes a photodetector optically coupled to the photon-pair source and configured to generate a plurality of electrical pulses in response to detection of at least a portion of the plurality of pump photon pulses at the first repetition rate and a clock generator coupled to the photodetector and configured to convert the plurality of electrical pulses into a plurality of clock signals at the first repetition rate.
    Type: Grant
    Filed: August 7, 2019
    Date of Patent: September 14, 2021
    Assignee: PSIQUANTUM, CORP.
    Inventor: Albert Wang
  • Patent number: 11095374
    Abstract: Techniques are described for implementing an out-of-band communication channel used to exchange control channel information in sub-carrier-based optical communication systems. In an example implementation, an apparatus includes laser operable to supply an optical signal, a digital signal processor operable to supply digital signals, a digital to analog circuitry operable to provide analog signals based on the digital signals, and driver circuitry is coupled to the digital to analog circuitry and operable to supply at least one drive signal. The apparatus also includes a modulator operable to receive said at least one drive signal, modulate the optical signal based on said at least one drive signal to provide a plurality of optical subcarriers, amplitude modulate the plurality of optical subcarriers at a first frequency to carry first control information, and modulate the plurality of subcarriers at a second frequency to carry second control information.
    Type: Grant
    Filed: September 20, 2019
    Date of Patent: August 17, 2021
    Assignee: Infinera Corporation
    Inventors: Amir Jafari, Steven J. Hand, Mohamed Osman
  • Patent number: 11088764
    Abstract: Techniques are described for implementing an out-of-band communication channel used to exchange control channel information in sub-carrier-based optical communication systems. In an example implementation, a transmitter includes a laser operable to supply an optical signal, a digital signal processor operable to supply first electrical signals based on first data input to the digital signal processor and second data input to the digital signal processor, digital-to-analog conversion circuitry operable to output second electrical signals based on the first electrical signals, modulator driver circuitry is operable to output third electrical signals based on the second electrical signals, and an optical modulator operable to supply first and second modulated optical signals based on the third electrical signals. The first modulated optical signal includes a plurality of optical subcarriers carrying user data. The second modulated optical signal is polarization modulated based on the second data.
    Type: Grant
    Filed: September 20, 2019
    Date of Patent: August 10, 2021
    Assignee: Infinera Corporation
    Inventors: Amir Jafari, Steven J. Hand, Mohamed Osman
  • Patent number: 11070765
    Abstract: A method and apparatus for night lapse video capture are disclosed. The apparatus includes an image sensor, an image processor, and a video encoder. The image sensor is configured to capture image data. The image data includes a first image that is temporally precedent to a second image. The image processor is configured to determine a motion estimation. The motion estimation is based on a comparison of a portion of the first image and a portion of the second image. The image processor is configured to subtract a mask from the second image to obtain a denoised image. The mask is based on the motion estimation. The video encoder is configured to receive the denoised image from the image processor. The video encoder is configured to encode the denoised image in a video format. The video encoder is configured to output a video file in the video format.
    Type: Grant
    Filed: April 23, 2019
    Date of Patent: July 20, 2021
    Assignee: GoPro, Inc.
    Inventors: Ojas Gandhi, Anandhakumar Chinnaiyan, Naveen Chinya Krishnamurthy
  • Patent number: 11070293
    Abstract: The present disclosure provides a method and a device for amplifying uplink light of a passive optical network, and a computer-readable storage medium. The passive optical network includes an optical network unit, an optical line terminal, and an optical amplifier provided between the optical network unit and the optical line terminal, and the method include: receiving a registration signal transmitted from the optical line terminal; determining a gain value of the optical amplifier, and performing gain value adjustment on the optical amplifier according to the determined gain value; and completing registration when an uplink optical signal transmitted to the optical line terminal through the optical amplifier reaches preset power.
    Type: Grant
    Filed: September 21, 2018
    Date of Patent: July 20, 2021
    Assignee: ZTE CORPORATION
    Inventors: Wei Yang, Xingang Huang, Jiangyan He
  • Patent number: 11070349
    Abstract: A clock and data recovery circuit includes an equalizer configured to equalize an input signal to generate an equalization input signal, a subtractor configured to subtract a decision feedback equalization signal from the equalization input signal to generate a sampling input signal, a decision feedback equalization unit configured to generate first digital data corresponding to the sampling input signal in response to a first sampling clock signal, generate second digital data corresponding to the sampling input signal in response to a second sampling clock signal having a predetermined time difference with the first sampling clock signal, and compare the sampling input signal and a reference data level. A controller is configured to adjust the reference data level, determine a maximum eye opening and adjust a sample timing based on the reference data level.
    Type: Grant
    Filed: September 24, 2020
    Date of Patent: July 20, 2021
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Hyeyoon Joo
  • Patent number: 11024002
    Abstract: An example apparatus for correcting gaze in images includes an image receiver to receive an image comprising an eye and a target angle set to a center. The apparatus also includes a bidirectionally trained convolutional neural network (CNN) to receive the image and the target angle from the image receiver and generate a vector field and a brightness map based on the image and the target angle. The apparatus further includes an image corrector to generate a gaze corrected image based on the vector field and the brightness map.
    Type: Grant
    Filed: May 15, 2019
    Date of Patent: June 1, 2021
    Assignee: Intel Corporation
    Inventors: Furkan Isikdogan, Timo Gerasimow, Gilad Michael
  • Patent number: 11005508
    Abstract: One example includes a digital signal conditioner (DSC) system. A sample selector bank receives a digital sample block of an input signal that is provided at a supported input oversampling factor and selects a subset of samples from the digital sample block based on a selection signal. A tap weights selector bank generates a set of tap weights based on the selection signal. A filter bank receives the subset of the samples from each of the sample selectors and a respective set of tap weights. Each filter provides a weighted sample associated with the respective subset of samples and the respective set of tap weights. A reformattor receives the weighted sample from each of the filters and provides a filtered sample block including the weighted sample from a subset of the filters at an output oversampling factor for each supported input oversampling factor based on a selected supported resampling ratio.
    Type: Grant
    Filed: January 28, 2020
    Date of Patent: May 11, 2021
    Assignee: VIASAT, INC.
    Inventors: Murat Arabaci, Fan Mo, Daniel Kang, Timothy K. Gao
  • Patent number: 10958230
    Abstract: In optical receivers, extending the transimpedance amplifier's (TIA) dynamic range is a key to increasing the receiver's dynamic range, and therefore increase the channel capacity. Ideally, the TIA requires controllable gain, whereby the receiver can modify the characteristics of the TIA and/or the VGA to process high power incoming signals with a defined maximum distortion, and low power incoming signals with a defined maximum noise. A solution to the problem is to provide TIA's and VGA's with reconfigurable sizes, which are adjustable based on the level of power, e.g. current, generated by the photodetector.
    Type: Grant
    Filed: September 10, 2018
    Date of Patent: March 23, 2021
    Assignee: Elenion Technologies, LLC
    Inventors: Ariel Leonardo Vera Villarroel, Abdelrahman Ahmed, Alexander Rylyakov
  • Patent number: 10931287
    Abstract: Disclosed herein is an apparatus that includes a phase frequency detector configured to compare a phase difference between first and second clock signals to generate a phase detection signal, and a slew rate controller configured to lower a slew rate of the first clock signal when a selection signal is in a first state.
    Type: Grant
    Filed: August 22, 2019
    Date of Patent: February 23, 2021
    Assignee: Micron Technology, Inc.
    Inventors: Yasuhiro Takai, Martin Brox, Mani Balakrishnan, Maksim Kuzmenka
  • Patent number: 10917267
    Abstract: 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. Each of the partial voltage domains may be offset by a DC voltage from the other partial voltage domains. The sum of the partial domains may be equal to a supply voltage of the integrated circuit. The complementary signals may be received from a photodiode. The amplified received signals may be amplified via stacked common source amplifiers, common emitter amplifiers, or stacked inverters. The amplified received signals may be DC coupled prior to combining. The complementary received signals may be amplified and combined via cascode amplifiers. The voltage domains may be stacked, and may be controlled via feedback loops. The photodetector may be integrated in the integrated circuit.
    Type: Grant
    Filed: December 30, 2019
    Date of Patent: February 9, 2021
    Assignee: Luxtera LLC
    Inventor: Brian Welch
  • Patent number: 10887677
    Abstract: The present disclosure relates to optical receivers. One example optical receiver includes an optoelectronic detector, a transimpedance amplification (TIA) circuit, a single-ended-to-differential converter, an I/O interface, and a controller. The optoelectronic detector, having bandwidth lower than required system transmission bandwidth, converts an optical signal into a current signal. The TIA circuit compensates gain for the received current signal based on a received control signal to obtain a voltage signal, where a frequency response value of the current signal within first bandwidth is greater than that within the bandwidth of the optoelectronic detector, and any frequency in the first bandwidth is not lower than an upper cut-off frequency of the optoelectronic detector. The single-ended-to-differential converter converts the voltage signal into a differential voltage signal. The I/O interface outputs the differential voltage signal.
    Type: Grant
    Filed: July 23, 2019
    Date of Patent: January 5, 2021
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Shengmeng Fu, Yu Xiong, Jiangwei Man, Chengyan Wang, Xiaofei Zeng, Li Zeng
  • Patent number: 10833769
    Abstract: A PDM-capable coherent optical receiver can be implemented using four high-bandwidth photodiodes connected in a single-ended electrical configuration. The SSBI present in the electrical output of the single-ended photodiodes is effectively canceled in the receiver DSP based on measurements of average optical power of the optical data and local-oscillator signals. In various embodiments, such measurements can be performed using relatively inexpensive circuits/components incorporated into the optical front end of the receiver. For a given signaling interval, the DSP runs an iterative algorithm to compute estimates of the in-phase and quadrature components of the optical data signal and achieve a level of performance comparable to that of a coherent optical receiver having a greater number of high-bandwidth photodiodes connected to form balanced photodetectors. The achieved reduction in the number of high-bandwidth photodiodes can advantageously be used, e.g.
    Type: Grant
    Filed: September 18, 2019
    Date of Patent: November 10, 2020
    Assignee: Nokia Solutions and Networks OY
    Inventor: Thai Son Le
  • Patent number: 10819443
    Abstract: The receiving-side system (10) includes a smaller number of optical reception front ends (12) than the number of a plurality of wavelength-multiplexed subcarrier signals. Each of the optical reception front ends (12) is configured to receive two or a plurality subcarrier signals of the plurality of subcarrier signals. A frequency offset monitoring unit (22) monitors frequency offsets of the respective subcarrier signals received by the optical reception front end (12). A light source frequency control unit (24) controls at least one of a light source frequency of the transmitting-side system (2) and a light source frequency of the receiving-side system (10) based on a result of the monitoring performed by the frequency offset monitoring unit (22).
    Type: Grant
    Filed: March 5, 2018
    Date of Patent: October 27, 2020
    Assignee: NEC CORPORATION
    Inventor: Hidemi Noguchi
  • Patent number: 10816738
    Abstract: One example includes an optical coupler. The optical coupler includes a waveguide formed in a first layer of a layered structure that is to propagate an optical signal. The waveguide includes an end portion. The optical coupler also includes a turning mirror that includes a bulk structure and a reflective material deposited on an angular face of the bulk structure to form a surface of the turning mirror. The bulk structure can have a greater cross-sectional size than a cross-sectional size of the waveguide, such that the angular face extends above the first layer of the layered structure and extends into a second layer of the layered structure below the first layer. The surface of the turning mirror can be arranged to reflect the optical signal that is provided from the end portion of the waveguide.
    Type: Grant
    Filed: October 24, 2014
    Date of Patent: October 27, 2020
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Sagi Mathai, Michael Renne Ty Tan
  • Patent number: 10801829
    Abstract: Swept source optical coherence tomography (SS-OCT) systems and methods may employ down-conversion. Down-converter systems and methods may utilize a distribution element and a frequency down shifter. The distribution element may receive an output signal of a photo detection device, the output signal comprising a first frequency component at or below a maximum conversion frequency and a second frequency component above the maximum conversion frequency. The distribution element may send the first frequency component to an analog to digital (A/D) converter and send the second frequency component to a frequency down shifter. The frequency down shifter may down shift the second frequency component to a frequency at or below the maximum conversion frequency to form a down shifted second frequency component. The frequency down shifter may send the down shifted second frequency component to the A/D converter.
    Type: Grant
    Filed: November 2, 2018
    Date of Patent: October 13, 2020
    Assignee: AMO Development, LLC
    Inventors: Thomas D. Raymond, Isaac Neal, Daniel R. Hamrick, Thomas M. Shay
  • Patent number: 10791385
    Abstract: A pluggable module is provided for converting an optical signal to a plurality of electrical signals. The pluggable module may include a printable circuit board (PCB) and an optical connector disposed on a first side of the PCB. The optical connector may route any received optical signal to an optical to electrical transceiver. The optical to electrical transceiver may convert the optical signal to an electrical signal and route the electrical signal to an electrical connector mounted on a second, opposite side of the PCB.
    Type: Grant
    Filed: September 28, 2018
    Date of Patent: September 29, 2020
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Terrel Morris, John Norton, Daniel Alan Berkram
  • Patent number: 10756815
    Abstract: A free space optical communication system includes an optical receiver configured to receive a light beam from an optical transmitter wirelessly in free space. The optical receiver includes an array of photodetectors and an electrical circuit. The array of photodetectors is configured to receive the light beam and convert optical signals of the light beam into electrical current. The electrical circuit is electrically coupled to the array of photodetectors and is configured to combine electrical current from the photodetectors and output a voltage or current signal.
    Type: Grant
    Filed: August 21, 2018
    Date of Patent: August 25, 2020
    Assignee: Molex, LLC
    Inventors: YuYun Shih, Lee Cheung, Gongjian Hu
  • Patent number: 10708094
    Abstract: Systems and methods for transmission filtering are provided. A receiver includes an input coupled to a transmission line to receive distorted optical symbols. A distortion filter is coupled to the input to replace the distorted optical symbols with predicted symbols using a trained neural network. A decoder is coupled to the distortion filter to decode the predicted symbols.
    Type: Grant
    Filed: October 5, 2018
    Date of Patent: July 7, 2020
    Assignee: NEC Corporation
    Inventors: Fatih Yaman, Shaoliang Zhang, Eduardo Mateo Rodriguez, Yoshihisa Inada, Yue-Kai Huang, Weiyang Mo
  • Patent number: 10708011
    Abstract: An apparatus for determining an eye mask of a device under test (DUT) which is configured to receive a data bit stream signal including a threshold level value and output a data bit stream output signal. The apparatus includes an input unit configured to receive the data bit stream output signal provided by the DUT, an evaluation unit configured to evaluate the received data bit output signal and provide an evaluation result, and a controller configured to change the threshold level value in response to the evaluation result. The apparatus is integrated into the DUT and can operates autonomously without multiple interactions with a tester.
    Type: Grant
    Filed: January 31, 2019
    Date of Patent: July 7, 2020
    Assignee: SK Hynix Inc.
    Inventors: Jinliang Mao, Chee Hoe Chu
  • Patent number: 10700786
    Abstract: An optical transceiver includes an optical transmitter and an optical receiver. The optical transmitter includes a laser diode configured to convert a current signal into an optical signal; a main driver comprising first and second output terminals that have a differential structure, the main driver configured to drive the first and second output terminals in response to differential input signals and to provide the current signal to the laser diode through the first output terminal; and an impedance balancer configured to match impedances of the first and second output terminals by adjusting the impedance of the second output terminal according to signal states of the first and second output terminals.
    Type: Grant
    Filed: September 9, 2019
    Date of Patent: June 30, 2020
    Assignees: SK hynix Inc., Korea University Research and Business Foundation
    Inventors: Chul Woo Kim, Sang Geun Bae, Hyun Su Park, Choong Hwan Lee
  • Patent number: 10644805
    Abstract: In optical receivers, cancelling the DC component of the incoming current is a key to increasing the receiver's effectiveness, and therefore increase the channel capacity. Ideally, the receiver includes a DC cancellation circuit for removing the DC component; however, in differential receivers an offset may be created between the output voltage components caused by the various amplifiers. Accordingly, an offset cancellation circuit is required to determine the offset and to modify the DC cancellation circuit accordingly.
    Type: Grant
    Filed: October 29, 2019
    Date of Patent: May 5, 2020
    Assignee: Elenion Technologies, LLC
    Inventors: Ariel Leonardo Vera Villarroel, Abdelrahman Ahmed, Alexander Rylyakov
  • Patent number: 10644791
    Abstract: Embodiments of this disclosure provide an impairment monitoring apparatus, impairment monitoring and compensating system and method. As a parameter of a impairment of a receiver end and/or a parameter of an impairment of a transmitter end is/are determined according to a preset period or a preset condition to perform compensation or calibration, complexity of calculation and power consumption of the system may be efficiently lowered. And as the parameter of the impairment of the receiver end and the parameter of the impairment of the transmitter end are not changed rapidly, determining these parameters according to the preset period or the preset condition to perform compensation or calibration will not affect an effect of the compensation or calibration, thereby ensuring a performance of the system.
    Type: Grant
    Filed: February 28, 2019
    Date of Patent: May 5, 2020
    Assignee: FUJITSU LIMITED
    Inventors: Junpeng Liang, Yangyang Fan, Zhenning Tao
  • Patent number: 10634862
    Abstract: An optical communication device, reception apparatus, transmission apparatus and transmission and reception system are disclosed. The optical communication device includes a drive circuit substrate. A first through via extends through the drive circuit substrate and is configured to electrically connect an optical element disposed on a first surface side of the drive circuit substrate to a drive circuit disposed on a second surface side of the drive circuit substrate. A positioning element is attached to an interposer substrate and is configured to align optical axes of a first lens that is attached to a lens substrate and that faces a second lens that is disposed on the first surface side of the drive circuit substrate. A second through via extends through the interposer substrate and electrically connects the drive circuit to a signal processing circuit disposed on a signal processing substrate positioned above the interposer substrate.
    Type: Grant
    Filed: November 26, 2018
    Date of Patent: April 28, 2020
    Assignee: Sony Corporation
    Inventors: Shinji Rokuhara, Shusaku Yanagawa, Eiji Otani, Shuichi Oka, Kazunao Oniki, Hiizu Ootorii
  • Patent number: 10615759
    Abstract: Methods and systems for accurate gain adjustment of a transimpedance amplifier using a dual replica and servo loop is disclosed and may include, in a transimpedance amplifier (TIA) circuit comprising a first TIA, a second TIA, and a third TIA, each comprising a configurable feedback impedance, and a control loop, where the control loop comprises a gain stage with inputs coupled to outputs of the first and second TIAs and an output coupled to the configurable feedback impedance of the second and third TIAs: configuring a gain level of the first TIA by configuring its feedback impedance, configuring a gain level of the third TIA by configuring a reference current applied to an input of the first TIA, and amplifying a received electrical signal to generate an output voltage utilizing the third TIA. The reference current may generate a reference voltage at one of the inputs of the gain stage.
    Type: Grant
    Filed: November 21, 2018
    Date of Patent: April 7, 2020
    Assignee: Luxtera, Inc.
    Inventors: Stefan Barabas, Joseph Balardeta, Simon Pang, Scott Denton
  • Patent number: 10601522
    Abstract: An optical receiver is configured so as to be as less susceptible to noise as possible even in the case where high noise occurs inside an optical transceiver. The optical receiver includes a connection part that connects two photodiodes (PDs) constituting a dual photodiode and a transimpedance amplifier (TIA), wherein signal lines from the dual photodiode are surrounded by a conductor pattern that is not connected to each of the signal lines for each channel, and the conductor pattern is connected to a ground pattern on the transimpedance amplifier or a power source pattern for the PDs.
    Type: Grant
    Filed: June 19, 2017
    Date of Patent: March 24, 2020
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Toshihiro Itoh, Yuriko Kawamura, Kiyofumi Kikuchi, Ken Tsuzuki, Hiroshi Fukuda, Shin Kamei
  • Patent number: 10488608
    Abstract: An optical module includes an optoelectronic transceiver. The optical modules includes a heat sink. The heat sink includes a heat radiating element aligned along a length of the heat sink. The heat sink radiates heat received from the optoelectronic transceiver. The optical modules includes a housing. The optoelectronic transceiver is encapsulated by the heat sink and the housing.
    Type: Grant
    Filed: August 8, 2018
    Date of Patent: November 26, 2019
    Assignee: Arista Networks, Inc.
    Inventors: Robert Wilcox, Richard Hibbs, Warren Meggitt, Andreas Bechtolsheim, Jiayi Wu, Christophe Metivier
  • Patent number: 10476600
    Abstract: An optical signal modulator comprising a modulator unit, a photodetector and an electrical signal combiner. The modular unit having an optical ingress port for optical radiation, a first and second optical output port each for modulated optical radiation, and an electrical ingress port for an electrical modulation signal. The optical radiation is modulated in response to the electrical modulation signal. The photodetector is connected to the second optical output port and configured to measure the modulated optical radiation that is emitted, and to provide a monitor signal. The electrical signal combiner having a first input port for an external electrical data signal, a second electrical input port for a correction signal based on the monitor signal, and an electrical output port that is connected to the electrical ingress port. The combiner generates the electrical modulation signal by combining the external electrical data signal and the correction signal.
    Type: Grant
    Filed: January 12, 2018
    Date of Patent: November 12, 2019
    Assignee: SICOYA GMBH
    Inventor: Ulrich Keil
  • Patent number: 10476603
    Abstract: A method and structure for a coherent optical receiver device. Timing recovery (TR) is implemented after channel dispersion (i.e., chromatic dispersion (CD) and polarization mode dispersion (PMD)) compensation blocks. This architecture provides both improves performance and reduces power consumption of the device. Also, a TR loop is provided, enabling computing, by an error evaluation module, a first sampling phase error (SPE) and computing, by a timing phase information (TPI) module coupled to the error evaluation module, a second SPE from a plurality of CD equalizer taps PMD equalizer taps. The first and second SPE are combined into a total phase error (TPE) in a combining module, and the resulting TPE is filtered by a timing recovery (TR) filter coupled to an interpolated timing recovery (ITR) module and the combining module. The ITR module then synchronizes an input signal of the coherent optical receiver according to the TPE.
    Type: Grant
    Filed: September 18, 2018
    Date of Patent: November 12, 2019
    Assignee: INPHI CORPORATION
    Inventors: Mario R. Hueda, Oscar E. Agazzi
  • Patent number: 10454590
    Abstract: When a frequency deviation compensation amount is compensated for by use of frequency shift, a phase offset occurs between adjacent input blocks included in a plurality of input blocks as divided, with the result that an error occurs in a reconstructed bit sequence. A frequency deviation compensation system of the invention is characterized by comprising: a frequency deviation compensation means for compensating for a frequency deviation occurring in a signal by use of frequency shift; and a phase offset compensation means for compensating for a phase offset occurring, in the signal, due to the frequency shift.
    Type: Grant
    Filed: January 3, 2019
    Date of Patent: October 22, 2019
    Assignee: NEC CORPORATION
    Inventors: Daisaku Ogasahara, Junichi Abe
  • Patent number: 10439734
    Abstract: Methods and systems for waveguide delay based equalization summing at single-ended to differential converters in optical communication are disclosed and may include: in an optoelectronic receiver including a directional coupler, photodetectors, transimpedance amplifiers (TIAs), and a gain stage, receiving an input optical signal; splitting the input optical signal into first and second optical signals using the directional coupler; generating a first current from the first optical signal using a first photodetector; generating a first voltage from the first current using a first TIA; communicating the first voltage to a first input of the gain stage; generating a second current from the second optical signal using a second photodetector; generating a second voltage from the first signal using a second TIA; communicating the second voltage to a second input of the gain stage; and generating a differential output voltage from the first and second voltages using the gain stage.
    Type: Grant
    Filed: June 28, 2017
    Date of Patent: October 8, 2019
    Assignee: Luxtera, Inc.
    Inventors: Simon Pang, Joseph Balardeta
  • Patent number: 10411808
    Abstract: A method of generating a probabilistically shaped (PS), multi-level modulation signals includes encoding information bits into coded bits to which probability values are assigned according to a probability mass function, and mapping, based on a Gray coding scheme, the coded bits into symbols to which the probability values are assigned. The probability mass function is implemented by determining probabilities of the coded bits so that the probabilities of the coded bits in ascending or descending order have a Gaussian distribution, and performing a probability distribution pre-adjustment by redistributing probabilities of the coded bits corresponding to symbols probabilities of which are outside Gaussian distribution so that the symbols mapped based on the Gray coding scheme have the Gaussian distribution.
    Type: Grant
    Filed: January 5, 2018
    Date of Patent: September 10, 2019
    Assignee: ZTE Corporation
    Inventors: Hung-Chang Chien, Jianjun Yu
  • Patent number: 10404399
    Abstract: The differences in the power received from multiple optical network units connected to an optical hub may exceed an allowable dynamic range. The dynamic range may be reduced by determining the power received at the optical hub from each optical network unit and adjusting the power transmitted from one or more optical network units to reduce the overall dynamic range. For each optical network unit, the hub may determine the received optical power in an upstream signal from the optical network unit and receive a digital representation of the transmitted power. The hub may determine to adjust the optical power sent from one or more of the optical network units to reduce the dynamic range. The adjustments to the optical powers at the optical network units may be performed by sending commands from the optical hub to each adjusted optical network unit via a downstream signal.
    Type: Grant
    Filed: April 19, 2018
    Date of Patent: September 3, 2019
    Assignee: ZTE Corporation
    Inventors: Jun Shan Wey, Junwen Zhang
  • Patent number: 10353194
    Abstract: An optical communication system having a data transmitter which includes: at least one optical emission device to output light energy as an optical beam having an operating bandwidth; a beam dividing device to receive and divide the operating bandwidth into plural communication bands; a frequency presence modulation unit to: spectrally segregate the bandwidth of at least one communication band into plural channels, and modulate the bandwidth to selectively produce an optical output signal with wavelengths that correspond to one or more of the channels, wherein presence and absence of energy within channels constitute an information packet for data communication; a controller for providing a control signal to the frequency presence modulation unit to spectrally segregate the bandwidth of the at least one communication band into the plural channels; and a telescope to transmit the optical output signal.
    Type: Grant
    Filed: December 29, 2016
    Date of Patent: July 16, 2019
    Assignee: BOOZ ALLEN HAMILTON INC.
    Inventor: Keith A. Blanks
  • Patent number: 10355787
    Abstract: A digital optical receiver capable of adaptively correcting the linearity of an analog front end unit is provided.
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: July 16, 2019
    Assignee: NEC CORPORATION
    Inventor: Hidemi Noguchi
  • Patent number: 10341019
    Abstract: An optical communication system that includes a data transmitter which includes: at least one ultraviolet laser source configured to output ultraviolet light energy as an optical beam having an operating bandwidth with at least one communication band; a frequency presence modulation unit including at least one optical component having an ultraviolet coating, the frequency presence modulation unit being configured to: spectrally segregate the bandwidth of the at least one communication band into plural channels, and modulate the bandwidth to selectively produce an ultraviolet optical output signal with wavelengths that correspond to one or more of the channels, wherein a presence and absence of energy within channels of the communication band will constitute an information packet for data communication; and a controller for providing a control signal to the frequency presence modulation unit to spectrally segregate the bandwidth of the at least one communication band into the plural channels.
    Type: Grant
    Filed: June 26, 2018
    Date of Patent: July 2, 2019
    Assignee: BOOZ ALLEN HAMILTON INC.
    Inventor: Keith A. Blanks