Patents Examined by Shi K. Li
  • Digital signal conditioner system
    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
  • Optical communications module link extender backhaul systems and methods
    Patent number: 10999658
    Abstract: This disclosure relates to systems and devices related to multiplexing optical data signals. A method may be disclosed for transporting optical data signals. The method may comprise transmitting, by a master terminal center (MTC) comprising a spine switch, the optical data signal to a coherent transport chassis. The method may comprise transmitting, by the coherent transport chassis, the optical data signal to a leaf switch of a secondary terminal center (STC). The method may comprise transmitting, by the leaf switch, the optical data signal to an optical communications module link extender (OCML) in the STC. The method may comprise transmitting, by the OCML, the optical data signal to a dense wave division multiplexer (DWDM).
    Type: Grant
    Filed: September 12, 2019
    Date of Patent: May 4, 2021
    Assignee: Cox Communications, Inc.
    Inventor: Harjinder S. Ghuman
  • Ternary modulation using inter-operable transmitters and receivers
    Patent number: 10992388
    Abstract: A ternary phase shift keying transmitter and receiver can efficiently communicate using ternary encoded data that avoids indistinguishable transition curves for each of the three modulated states in the ternary encoded data. The transmitter is interoperable and can function with different types of receivers including direct detection-based receivers and coherent detection-based receivers.
    Type: Grant
    Filed: April 24, 2020
    Date of Patent: April 27, 2021
    Assignee: Juniper Networks, Inc.
    Inventor: Zhen Qu
  • Adaptive equalization filter and signal processing device
    Patent number: 10985845
    Abstract: Each of a first filter to a fourth filter is an FIR filter having one tap. Each of a fifth filter and a sixth filter is an FIR filter having less than 46 taps. As a result, it is possible to obtain an adaptive equalization filter having a smaller total number of taps than an adaptive equalization filter using an FIR filter having 24 taps as each of the first to fourth filters.
    Type: Grant
    Filed: August 28, 2017
    Date of Patent: April 20, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Masashi Binkai, Keisuke Matsuda, Ryosuke Matsumoto
  • Coherent receiver with mixed signal processing
    Patent number: 10979148
    Abstract: A receiver system is provided for receiving a coherent Pulse Amplitude Modulation (PAM) encoded signal. The receiver system may include an optical polarization component configured to modulate a polarization of the received coherent PAM encoded signal. The receiver system may further include a digital signal processor (DSP) configured to perform polarization recovery between the received coherent PAM encoded signal and the LO signal using a first control loop, and to perform phase recovery between the received coherent PAM encoded signal and the LO signal using a second control loop.
    Type: Grant
    Filed: November 6, 2019
    Date of Patent: April 13, 2021
    Assignee: Google LLC
    Inventors: Xiang Zhou, Hong Liu
  • Subchannel photonic routing, switching and protection with simplified upgrades of WDM optical networks
    Patent number: 10972209
    Abstract: The present invention includes novel techniques, apparatus, and systems for optical WDM communications. Tunable lasers are employed to generate respective subcarrier frequencies which represent subchannels of an ITU channel to which client signals can be mapped. In one embodiment, subchannels are polarization interleaved to reduce crosstalk. In another embodiment, polarization multiplexing is used to increase the spectral density. Client circuits can be divided and combined with one another before being mapped, independent of one another, to individual subchannels within and across ITU channels. A crosspoint switch can be used to control the client to subchannel mapping, thereby enabling subchannel protection switching and hitless wavelength switching.
    Type: Grant
    Filed: October 10, 2018
    Date of Patent: April 6, 2021
    Assignee: Snell Holdings, LLC
    Inventors: Chris Wilhelm Barnard, Piotr Myslinski
  • Transmitting device, transmission control device, and transmission method
    Patent number: 10951312
    Abstract: A transmitting device is disclosed. A lighting device changes a first characteristic and a second characteristic of light to be emitted along time series. A processor controls, in a period having a first time length, the lighting device to modulate the first characteristic of the light from the lighting device in the time series in accordance with a light emission pattern having a waveform according to information to be transmitted and having the first time length. The processor controls the lighting device to perform pulse modulation with a pulse pattern having a second time length shorter than the first time length for the second characteristic in accordance with the information. The processor sets peak and bottom values of the second characteristic of each pulse included in a subsection, for an average of the second characteristic to be a value maintaining the waveform of the light emission pattern.
    Type: Grant
    Filed: August 7, 2019
    Date of Patent: March 16, 2021
    Assignee: FUJITSU LIMITED
    Inventors: Kensuke Kuraki, Ryuta Tanaka
  • Systems and methods for building wireless mesh networks
    Patent number: 10951513
    Abstract: Disclosed herein is a system comprising a set of wireless communication nodes that are configured to operate as part of a wireless mesh network. Each respective wireless communication node may be directly coupled to at least one other wireless communication node via a respective short-hop wireless link, and at least a first pair of wireless nodes may be both (a) indirectly coupled to one another via a first communication path that comprises one or more intermediary wireless communication nodes and two or more short-hop wireless links and (b) directly coupled to one another via a first long-hop wireless link that provides a second communication path between the first pair of wireless communication nodes having a lesser number of hops than the first communication path. A fiber access point may be directly coupled to a first wireless communication node of the set of wireless communication nodes.
    Type: Grant
    Filed: September 6, 2019
    Date of Patent: March 16, 2021
    Inventors: Kevin Ross, Muhammad Ahsan Naim
  • Wavelength division multiplexing device and method
    Patent number: 10944499
    Abstract: The present disclosure provides a wavelength division multiplexing (WDM) device for demultiplexing an optical signal including a plurality of wavelength channels. The device comprises at least one demultiplexer block configured to provide, for each wavelength channel of the optical signal, two half-channel signals. The device further comprises a mode mapping block configured to map one half-channel signal related to a split wavelength channel into a first polarization mode, and the other half-channel signal related to the same split wavelength channel into a second polarization mode. The device also comprises an output block for each wavelength channel, each output block being configured to combine polarized half-channel signals related to the same wavelength channel.
    Type: Grant
    Filed: November 27, 2019
    Date of Patent: March 9, 2021
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Ulagalandha Perumal Dharanipathy, Martijn Tassaert, Marco Lamponi, Dirk Taillaert
  • Device and method for monitoring two-stage faults of TDM-PON with high precision
    Patent number: 10944498
    Abstract: The present invention discloses a device and a method for monitoring two-stage faults of a TDM-PON with high precision. A two-stage TDM-PON system includes an OLT I, a feeder fiber II, a stage-1 1:n optical splitter III, a stage-1 branch fiber IV, a stage-2 1:n optical splitter V, a stage-2 branch fiber VI, and an optical network unit (ONU) VII. A two-stage optical network monitoring system includes a monitoring part on the OLT I side and a monitoring part on the ONU VII side, where the monitoring part on the OLT I side includes a control-end isolator-free semiconductor laser, a control-end coupler, a control-end optical coupling device, a control-end photodetector, an integrated signal acquisition and processing device, and an optical coupling device; and the monitoring part on the ONU VII side is similar to the monitoring part of the OLT I side.
    Type: Grant
    Filed: May 21, 2020
    Date of Patent: March 9, 2021
    Assignee: Taiyuan University of Technology
    Inventors: Anbang Wang, Tong Zhao, Yuncai Wang, Bingjie Wang, Peixin He
  • Quantum interference detection of optical frequency comb offset frequency
    Patent number: 10931370
    Abstract: A method is presented for determining an offset frequency of a frequency comb. The method includes: generating a beam of light with a waveform that repeats regularly in the time domain and exhibits a frequency comb in the frequency domain; directing the beam of light towards a point of incidence on a material; and detecting oscillation of a photocurrent in the material that is caused by the beam of light. Of note, the beam of light has an optical bandwidth that includes light propagating at a first frequency and at a second frequency, where the first frequency is less than the second frequency and the ratio of the second frequency to the first frequency is n:m, where n=m+i, m is an integer greater than one, and n and i are positive integers. Additionally, the material has a band gap and the band gap is not more than n times the first frequency.
    Type: Grant
    Filed: May 10, 2018
    Date of Patent: February 23, 2021
    Assignee: THE REGENTS OF THE UNIVERSITY OF MICHIGAN
    Inventors: Steven T. Cundiff, John Sipe, Kai Wang, Rodrigo Muniz
  • Wireless communication link between at least one communication terminal device positioned in a predeterminable region and a communication network
    Patent number: 10931373
    Abstract: A wireless communication link between a communication network and a communication terminal device positioned in a predeterminable region may be established and improve capacity for wireless communication. A line-bound communication link to the communication network may be established via a communication base device arranged in a fixed location, and an optically-based communication link to the communication terminal device may be established via an optical deflection device.
    Type: Grant
    Filed: May 16, 2018
    Date of Patent: February 23, 2021
    Assignee: Osram GmbH
    Inventors: Gerhard Maierbacher, Alexander Wanderer
  • Protection for a degree-to-degree fiber link in an optical add/drop multiplexer (OADM)
    Patent number: 10897321
    Abstract: Systems and methods are provided for enabling degree-to-degree protection within an optical node, such as an Optical Add/Drop Multiplexer (OADM) node or Reconfigurable Optical Add/Drop Multiplexer (ROADM) node. According to an exemplary protection method, a step is executed for configuring two degree-to-degree fiber links between a first degree of the OADM node and a second degree of the OADM node. The method also includes designating a first degree-to-degree fiber link of the two degree-to-degree fiber links as a primary fiber link. Also, the method includes designating a second degree-to-degree fiber link of the two degree-to-degree fiber links as a protection fiber link configured for providing protection if a fiber break is detected on the primary fiber link.
    Type: Grant
    Filed: November 27, 2019
    Date of Patent: January 19, 2021
    Assignee: Ciena Corporation
    Inventor: Choudhury A. Al Sayeed
  • Apparatus and method for analog electronic fiber dispersion and bandwidth pre-compensation (EDPC) for use in 50 Gbps and greater PAMn optical transceivers
    Patent number: 10892827
    Abstract: Cost-effective high-data-rate optical data transceivers are presented, comprising an electronic analog transversal filter simultaneously providing one or more of bandwidth compensation and forward impairment compensations for the transmitted optical signal.
    Type: Grant
    Filed: April 26, 2019
    Date of Patent: January 12, 2021
    Assignee: NeoPhotonics Corporation
    Inventors: Winston I. Way, Raghavendra V. Juluri, Konstantin Gennadiyevich Kuzmin
  • Fourier-transform interferometer using meta surface
    Patent number: 10877349
    Abstract: A Fourier-transform interferometer includes a phase change plate including a reflective layer configured to reflect a first light that is incident, and a meta surface configured to locally and differently change a phase of the first light that is reflected. The Fourier-transform interferometer further includes a photodetector configured to detect a second light, and a transflective mirror and a mirror configured to transmit a first part of a third light that is incident, to the phase change plate, transmit a remaining part of the third light, to the photodetector, and transmit the first light of which the phase is locally and differently changed, to the photodetector. The photodetector is further configured to detect an interference pattern between the remaining part of the third light and the first light of which the phase is locally and differently changed.
    Type: Grant
    Filed: December 11, 2019
    Date of Patent: December 29, 2020
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Yeonsang Park
  • Active relative intensity noise mitigation using nested interferometers, and trans-impedance amplifier
    Patent number: 10880014
    Abstract: Active relative intensity noise mitigation in nested interferometers using trans-impedance amplifiers is provided by splitting an optical carrier signal into a first version and a second version, wherein the first version is orthogonal to the second version; re-combining predefined portions of the first version and the second version to determine a noise level; modulating at least one of the first version and the second version based on the noise level to reduce the noise level; after modulating the at least one of the first version and the second version based on the noise level, encoding data onto at least one of the first version and the second version; and recombining the first version and the second version to transmit the data.
    Type: Grant
    Filed: January 3, 2020
    Date of Patent: December 29, 2020
    Assignee: Cisco Technology, Inc.
    Inventors: Sanjay Sunder, Romesh Kumar Nandwana, Craig S. Appel
  • Apparatus and method capable of automatically identifying obstacle in front of mobile terminal
    Patent number: 10871755
    Abstract: The present invention discloses an apparatus and method capable of automatically identifying an obstacle in front of a mobile terminal, the apparatus comprising a transmitting module, a receiving module, and a controller MCU module. The transmitting module is in signal connection to the receiving module, the transmitting module and the receiving module are both in signal connection to the controller MCU module (STM32 series), and the controller MCU module is also in signal connection to a mobile terminal CPU. The present invention may automatically identify the road condition in front of the mobile terminal and may carry out a voice prompt in time.
    Type: Grant
    Filed: March 1, 2018
    Date of Patent: December 22, 2020
    Assignee: Guangdong Industry Polytechnic
    Inventors: Bing Dong, Wensheng Qin, Lan Huang, Yanling Yang, Deyu Luo, Xin Ouyang, Wenya Zhuang, Jun Hong
  • Multi-channel integrated photonic wavelength demultiplexer
    Patent number: 10862610
    Abstract: A multi-channel photonic demultiplexer includes an input region to receive a multi-channel optical signal including four distinct wavelength channels, four output regions, each adapted to receive a corresponding one of the four distinct wavelength channels demultiplexed from the multi-channel optical signal, and a dispersive region optically disposed between the input region and the four output regions. The dispersive region includes a first material and a second material inhomogeneously interspersed to form a plurality of interfaces that each correspond to a change in refractive index of the dispersive region and collectively structure the dispersive region to optically separate each of the four distinct wavelength channels from the multi-channel optical signal and respectively guide each of the four distinct wavelength channels to the corresponding one of the four output regions.
    Type: Grant
    Filed: November 11, 2019
    Date of Patent: December 8, 2020
    Assignee: X Development LLC
    Inventors: Martin Schubert, Brian Adolf, Jesse Lu
  • Optical domain equalization for coherent optical receivers
    Patent number: 10862716
    Abstract: An optical coherent receiver includes an optical hybrid (OH) configured to mix signal and reference light, and two back-end optical ports. An optical equalizing network interconnects two 180° OH output ports with the two back-end optical ports so that each back-end optical port receives light from each of the two OH output ports. Optical signals from each of the two back-end optical ports are converted to electrical signals that are fed to a differential amplifier. Adjusting coupling ratios and/or optical delays in the optical equalizing network reduces an OSNR penalty of a lower-bandwidth differential amplifier.
    Type: Grant
    Filed: September 19, 2019
    Date of Patent: December 8, 2020
    Assignee: Elenion Technologies, Inc.
    Inventors: Abdelrahman Ahmed, Ruizhi Shi, Alexander Rylyakov, Richard C. Younce
  • Free-space optical communication receiving device and method of controlling the same
    Patent number: 10862593
    Abstract: The objective of the present invention is to reduce the size of a receiving device circuit in an optical space communication system while maintaining communication stability. A data receiving device which decodes one item of data from a plurality of input signals includes: two or more digital signal processing means for subjecting the plurality of input signals to signal processing; a first recording means for temporarily recording the plurality of input signals; a SN ratio estimating means for estimating S/N ratios of each of the plurality of input signals and determining the number of the plurality of input signals to be combined, and the signals to be combined; and a scheduling means for carrying out overall control on the basis of the results from the SN ratio estimating means.
    Type: Grant
    Filed: March 17, 2017
    Date of Patent: December 8, 2020
    Assignee: NEC CORPORATION
    Inventors: Kohei Hosokawa, Toshiharu Ito, Seigo Takahashi, Manabu Arikawa, Takashi Ishikawa, Yoshimasa Ono