Patents Examined by Abbas H Alagheband
  • Patent number: 11451295
    Abstract: This application provides an optical link fault identification method, and relate to the field of communications technologies. The method includes: obtaining performance data of a network device, extracting a feature parameter of the performance data, and identifying a fault mode on an optical link based on the feature parameter. The method resolves problems of a difficulty in fault identification and slow troubleshooting that are caused by a large quantity of devices, many line faults, and a difficulty in obtaining manual troubleshooting cases. In addition, a fault can be quickly identified when the fault occurs, improving troubleshooting efficiency. When an optical link risk does not cause a fault, deterioration of the performance data can be found in advance based on a feature, to perform identification and warning.
    Type: Grant
    Filed: February 15, 2021
    Date of Patent: September 20, 2022
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Xin Xiao, Zhao Zhang, Jian Li, Yunpeng Gao
  • Patent number: 11438071
    Abstract: An optical repeater in a mode-division-multiplexing (MDM) optical transmission system prevents a signal-to-noise ratio (SNR) from deteriorating due to a loss of a mode demultiplexer. The optical repeater in the MDM optical transmission system is configured to include at least one multimode optical amplifier, a mode demultiplexer, a mode multiplexer, and variable optical attenuators. One of the multimode optical amplifiers is disposed on the input side of the mode demultiplexer.
    Type: Grant
    Filed: December 3, 2019
    Date of Patent: September 6, 2022
    Inventors: Hirotaka Ono, Koki Shibahara, Takayuki Mizuno, Yutaka Miyamoto
  • Patent number: 11424831
    Abstract: Disclosed is a frequency swept source apparatus including a mode locking laser that outputs an input optical signal having first to n-th frequency components, a transmission delay controller that generates first to m-th sub-optical signals, each of which includes at least one component of the first to n-th frequency components, and outputs a delay optical signal obtained by sequentially delaying the first to m-th sub-optical signals. The transmission delay controller includes a demultiplexer that outputs the first to m-th sub-optical signals to first to m-th channels based on the input optical signal, respectively, a path delay unit that adjusts lengths of optical paths of the first to m-th channels so as to be different from one another, a refractive index controller that adjusts a refractive index of each of the first to m-th channels, and a multiplexer that combines the first to m-th sub-optical signals.
    Type: Grant
    Filed: November 30, 2021
    Date of Patent: August 23, 2022
    Assignee: Electronics and Telecommunications Research Institute
    Inventor: Oh Kee Kwon
  • Patent number: 11405113
    Abstract: A hyperspectral radiometer may comprise one or more antennas, a electro-optical modulator modulating the received RF signal onto an optical carrier to generate a modulated signal having at least one sideband; a filter filtering the modulated signal to pass the sideband to a photodetector; and a photodetector producing an electrical signal from which information of the RF signal can be extracted. In some examples, the optical sideband may be spatially dispersed to provide a plurality of spatially separate optical components to the photodetector, where the spatially separate optical components having different frequencies and correspond to different frequencies of the received RF signal. In some examples, the passed sideband may be mixed with an optical beam having a frequency offset from the optical carrier to form a combined beam having at least one optical signal component having a beat frequency from which information of the RF signal can be extracted.
    Type: Grant
    Filed: February 5, 2021
    Date of Patent: August 2, 2022
    Assignee: Phase Sensitive Innovations, Inc.
    Inventors: Tom Dillon, Christopher Schuetz, Dennis Prather
  • Patent number: 11398870
    Abstract: Systems and methods for optical data communication in high temperatures and harsh environments are provided herein. The embodiments utilize a combination of a short wavelength light source combined with a wide bandgap detector in order to transmit optical signals. An optical data communication system may include a light source connected to a light detector via an optical fiber. The light source and the light detector may also be physically adjacent to any dielectric gap that can be spanned without having an optical fiber intermediary.
    Type: Grant
    Filed: March 1, 2021
    Date of Patent: July 26, 2022
    Assignee: General Electric Company
    Inventors: Cheng-Po Chen, Emad A. Andarawis
  • Patent number: 11381321
    Abstract: An optical power supply system includes a power sourcing equipment, a powered device, an information obtaining part and a power supply controller. The power sourcing equipment outputs feed light. The powered device converts the feed light into electric power. The electric power is supplied to a communicator. The information obtaining part obtains communication operation information on an operation status of communication that is performed by the communicator. Based on the obtained communication operation information, the power supply controller controls output of the feed light. The communicator is a wireless communicator that performs wireless communication.
    Type: Grant
    Filed: September 29, 2021
    Date of Patent: July 5, 2022
    Inventor: Tatsuo Mizukami
  • Patent number: 11381310
    Abstract: An integrated communication and ranging system for use on a spacecraft includes: a laser module configured to emit at least one beam, a pointing module configured to direct the at least one beam toward a ground station and toward an object in space, and a detector module configured to detect a scattered portion of the at least one beam. The system further includes a control module configured to operate the pointing module to (i) transmit data to the ground station using the at least one beam and (ii) determine, using the detector module, a distance between the spacecraft and the object using the at least one beam.
    Type: Grant
    Filed: November 18, 2020
    Date of Patent: July 5, 2022
    Inventor: Robert Erik Schwarz
  • Patent number: 11381315
    Abstract: Disclosed is an optical transmitter module including a directly modulated laser transmitter based on a directly modulated laser (DML) and an arrayed waveguide grating (AWG) chip that is vertically polished. The directly modulated laser transmitter includes a directly modulated laser chip array including one or more directly modulated laser chips, an impedance matching circuit that allows each of the one or more directly modulated laser chips to operate at a critical speed of 100 Gbps per channel or higher, and a radio frequency-flexible printed circuit board (RF-FPCB) that transmits a radio frequency (RF) modulating signal to the directly modulated laser chip array. The arrayed waveguide grating chip includes an optical waveguides that transfer multi-channel optical signals and a wavelength multiplexer that multiplexes the multi-channel optical signals. The directly modulated laser transmitter and the arrayed waveguide grating chip are spaced apart from each other and are optically coupled in chip-to-chip.
    Type: Grant
    Filed: January 22, 2021
    Date of Patent: July 5, 2022
    Inventors: Young-Tak Han, Seok Jun Yun, Seoktae Kim, Sang Ho Park, Yongsoon Baek, Jang Uk Shin, Seo Young Lee
  • Patent number: 11374657
    Abstract: To n antenna elements of the base station, n wavelengths set at predetermined intervals in a range in which chromatic dispersion in an optical fiber between accommodation and base stations can be regarded as constant are assigned. The accommodation station adjusts the phases of optical signals of the wavelengths or modulated signals that modulate the optical signals such that the amounts of phase shift of their RF signals are at predetermined intervals. The accommodation station transmits beacon signals multiple times while varying a transmission phase shift interval ?1 and the terminal transmits beacon number information of a beacon signal selected based on received power multiple times. The accommodation station varies a reception phase shift interval ?2 for each piece of beacon number information to determine a reception phase shift interval ?2 which maximizes the received power and determines the transmission phase shift interval ?1 based on the beacon number information received from the terminal.
    Type: Grant
    Filed: January 16, 2020
    Date of Patent: June 28, 2022
    Inventors: Kota Ito, Mizuki Suga, Yushi Shirato, Naoki Kita
  • Patent number: 11368215
    Abstract: An optical link for a communication network, the optical link having an optical fibre link, a downstream transmitter, a downstream receiver, an upstream transmitter and an upstream receiver. The upstream and downstream transmitters are configured to transmit a respective pilot tone on a respective optical carrier and are configured to tune a frequency of the pilot tone within a preselected frequency range. The upstream and downstream receivers are configured respectively to determine an upstream notch frequency, fnotch-US, and a downstream notch frequency, fnotch-DS, of respective detected photocurrents from at least one respective pilot tone frequency at which the respective detected photocurrent is equal to or lower than a photocurrent threshold. The optical link also includes processing circuitry configured to receive the upstream and downstream notch frequencies and configured to estimate a propagation delay difference of the optical link depending on the upstream and downstream notch frequencies.
    Type: Grant
    Filed: December 13, 2017
    Date of Patent: June 21, 2022
    Assignee: Telefonaktiebolaget LM Ericsson (Publ)
    Inventors: Fabio Cavaliere, Giulio Bottari, Stefano Ruffini
  • Patent number: 11367343
    Abstract: Methods and systems relating to administration of access credentials for electronic access control are disclosed. Web resources are provided for rendering a webpage including an access credential. A server device receives an access instruction authorizing a user to access an electronic lock associated with the access credential. A client device of the user transmits a first request for the access credential. The first request may be generated by a browser application of the client device. The server device provides the web resources and a browser cookie to the client device. Responsive to subsequent requests for the access credential, the server device determines whether the client device is authorized to receive the access credential based on the client device providing the browser cookie. When the server device determines that a subsequent request authorizes the client device to receive the access credential, the web resources are provided to the browser application.
    Type: Grant
    Filed: March 26, 2021
    Date of Patent: June 21, 2022
    Assignee: Videx, Inc.
    Inventor: Paul R. Davis
  • Patent number: 11353774
    Abstract: Disclosed are optical communications systems and optical receivers including one or more optical cavity resonators. In particular, disclosed are methods and apparatus that allow for beam pointing to be maintained while permitting the receiver to tune the optical resonator to suit the wavelength, data rate and modulation format of the incoming optical signal, without requiring a coherent receiver or adaptive optics in addition to optical resonators.
    Type: Grant
    Filed: July 15, 2020
    Date of Patent: June 7, 2022
    Inventors: Andrew Kowalevicz, Benjamin P. Dolgin, Gary M. Graceffo
  • Patent number: 11350191
    Abstract: Various example embodiments of the present disclosure relates to a physical layer, PHY, circuitry for an optical line terminal, OLT, the PHY circuitry being configured to receive a control signal including an identification of a transmitting ONT for pre-loading an equalization configuration associated with the identification of the transmitting ONT. Other example embodiments relate to a medium access control, MAC, circuitry for OLT, the MAC circuitry being configured to determine an upstream allocation map for optical network terminals, ONTs, and to generate a control signal for a PHY circuitry including synchronization information for receiving upstream optical signal bursts from a transmitting ONT and an identification of the transmitting ONT based on the upstream allocation map. Further example embodiments related to an optical line terminal, OLT, and a method therefor.
    Type: Grant
    Filed: November 12, 2020
    Date of Patent: May 31, 2022
    Assignee: Nokia Solutions and Networks Oy
    Inventors: Werner Van Hoof, Rene Bonk, Robert Borkowski
  • Patent number: 11349574
    Abstract: A construction and configuration for the receiving function of a high speed optical communication system with reduced manufacturing cost and improved performance. In an aspect, mounting the cover and lens provides a self-alignment behaviour that advantageously positions the cover and the lens to be in the optimum position for the photodiode. An assembly of electronic components receives data using an optical fibre. In one aspect, the assembly includes a photodiode, an amplifier coupled to the photodiode, and a printed circuit board on which the photodiode and amplifier are physically mounted, The printed circuit board has areas of a first material to which components may be attached using a fixing agent, and areas of a second material to which components will not attach using the fixing agent. Conductive bond wires are configured to directly couple the amplifier and the photodiode to conductive traces on an opposite side of the printed circuit board.
    Type: Grant
    Filed: June 18, 2020
    Date of Patent: May 31, 2022
    Assignee: HiLight Semiconductor Limited
    Inventors: Carl Carley, William Redman-White
  • Patent number: 11347003
    Abstract: Aspects described herein include an optical apparatus comprising a plurality of light-carrying media, a wavelength division multiplexing (WDM) device optically coupled with the plurality of light-carrying media, and a lens arranged between the WDM device and a multicore optical fiber. An arrangement of the plurality of light carrying media and the WDM device are selected to align each of the plurality of light-carrying media with a respective optical core of the multicore optical fiber.
    Type: Grant
    Filed: October 19, 2020
    Date of Patent: May 31, 2022
    Assignee: Cisco Technology, Inc.
    Inventors: Norbert Schlepple, Jock T. Bovington
  • Patent number: 11349572
    Abstract: An optical communication system is provided in which a serial/parallel converting unit outputs bit sequences of sequence groups a number of which is determined by a logarithmic value and a bit sequence of a highest-order sequence group, a converting unit converts the bit sequence of the sequence group input to the converting unit into a bit sequence for which a probability of occurrence of 0 or a probability of occurrence of 1 is a predetermined probability of occurrence, a selecting unit acquires a bit sequence for which the probability of occurrence is converted by a converting unit higher in order than the converting unit for the selecting unit, and selects an order of output of a symbol to other selecting units in the sequence groups higher in order than the selecting unit in accordance with the acquired bit sequence, a multiplication unit multiplies a value representing the symbol selected by a highest-order selecting unit, by a number in accordance with the bit sequence of the highest order sequence gro
    Type: Grant
    Filed: May 8, 2019
    Date of Patent: May 31, 2022
    Inventors: Masanori Nakamura, Seiji Okamoto, Etsushi Yamazaki, Yoshiaki Kisaka
  • Patent number: 11333837
    Abstract: An optical communication system includes a first communication system to communicate first information from a controller to a truck and a second communication system to communicate second information. The first communication system includes a first light emitter to output the first information, a first optical fiber to transport the light output from the first light emitter while letting the light leak therefrom, and a first light receiver to receive the light leaking from the first optical fiber. The second communication system includes a second light emitter to output second information, a second optical fiber to transport the light output from the second light emitter and input to the second optical fiber at some point along the second optical fiber, and a second light receiver to receive the light transported over the second optical fiber.
    Type: Grant
    Filed: August 8, 2018
    Date of Patent: May 17, 2022
    Inventors: Masakazu Ishibashi, Shinichiro Haruyama
  • Patent number: 11336443
    Abstract: A key distribution method based on broadband physical random sources includes: utilizing a driving semiconductor laser to generate an optical signal, passing the optical signal through a phase modulator driven by a random signal and then equally dividing the phase-modulated optical signal into two identical paths, injecting the two identical paths into slave semiconductor lasers at both communication parties Alice and Bob's sides, respectively, to generate initial synchronized signals, using the generated initial synchronized signals as driving signals to phase-modulate optical signals generated by continuous-wave (CW) light sources, and inputting the modulated optical signals to dispersion modules; wherein after the modulated CW optical signals pass through the dispersion modules, two synchronized broadband noise-like random signals are generated, and then high-speed synchronized keys are generated by a post-processing method.
    Type: Grant
    Filed: July 30, 2020
    Date of Patent: May 17, 2022
    Inventors: Ning Jiang, Kun Qiu, Anke Zhao, Shiqin Liu, Yiqun Zhang
  • Patent number: 11329722
    Abstract: A method, system, and apparatus are disclosed for a free-space communication optical terminal comprising an optical telescope (or telescopes) for bidirectional communication and navigation, a pointing and tracking system for transmission and reception of narrow optical beams, and a modem.
    Type: Grant
    Filed: March 11, 2021
    Date of Patent: May 10, 2022
    Inventors: Kush Patel, Michael Krainak
  • Patent number: 11328136
    Abstract: Disclosed are an optical communication device and a method for transmitting and receiving information. The optical communication device includes at least two light sources including a first light source and a second light source, and a controller configured to drive the first light source and the second light source in one or more driving modes. The first light source and the second light source are driven in a same driving mode for transmitting first information, and the first light source and the second light source are driven in different driving modes including a first driving mode and a second driving mode which have the same or different frequencies for transmitting other information different from the first information.
    Type: Grant
    Filed: March 19, 2021
    Date of Patent: May 10, 2022
    Inventors: Jun Fang, Xuheng Niu, Jiangliang Li