Patents by Inventor Shuchang Yao

Shuchang Yao has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Channel recovery in burst-mode, time-division multiplexing (TDM) passive optical networks (PONs)
    Patent number: 10469172
    Abstract: A transceiver comprises: a sampling phase optimization stage comprising: a first interpolator; a first equalizer coupled to the first interpolator; a first optimizer coupled to the first equalizer; and an output; and an equalization stage coupled to the output and comprising: a buffer; a second interpolator coupled to the buffer; and a second equalizer coupled to the second interpolator. A method comprising: receiving an optical burst signal; determining an optimum sampling phase based on a portion of a digital signal representing the optical burst signal; and equalizing all of the digital signal using the optimum sampling phase.
    Type: Grant
    Filed: November 2, 2018
    Date of Patent: November 5, 2019
    Assignee: Futurewei Technologies, Inc.
    Inventors: Xiang Liu, Frank Effenberger, Huaiyu Zeng, Shuchang Yao, Lei Zhou, Xianbo Dai, Shengming Ma, Lin Huang
  • Channel Recovery in Burst-Mode, Time-Division Multiplexing (TDM) Passive Optical Networks (PONs)
    Publication number: 20190074905
    Abstract: A transceiver comprises: a sampling phase optimization stage comprising: a first interpolator; a first equalizer coupled to the first interpolator; a first optimizer coupled to the first equalizer; and an output; and an equalization stage coupled to the output and comprising: a buffer; a second interpolator coupled to the buffer; and a second equalizer coupled to the second interpolator. A method comprising: receiving an optical burst signal; determining an optimum sampling phase based on a portion of a digital signal representing the optical burst signal; and equalizing all of the digital signal using the optimum sampling phase.
    Type: Application
    Filed: November 2, 2018
    Publication date: March 7, 2019
    Inventors: Xiang Liu, Frank Effenberger, Huaiyu Zeng, Shuchang Yao, Lei Zhou, Xianbo Dai, Shengming Ma, Lin Huang
  • Channel recovery in burst-mode, time-division multiplexing (TDM) passive optical networks (PONs)
    Patent number: 10153844
    Abstract: A transceiver comprises: a sampling phase optimization stage comprising: a first interpolator; a first equalizer coupled to the first interpolator; a first optimizer coupled to the first equalizer; and an output; and an equalization stage coupled to the output and comprising: a buffer; a second interpolator coupled to the buffer; and a second equalizer coupled to the second interpolator. A method comprising: receiving an optical burst signal; determining an optimum sampling phase based on a portion of a digital signal representing the optical burst signal; and equalizing all of the digital signal using the optimum sampling phase.
    Type: Grant
    Filed: April 3, 2017
    Date of Patent: December 11, 2018
    Assignee: Futurewei Technologies, Inc.
    Inventors: Xiang Liu, Frank Effenberger, Huaiyu Zeng, Shuchang Yao, Lei Zhou, Xianbo Dai, Shengming Ma, Lin Huang
  • Higher-level clock and data recovery (CDR) in passive optical networks (PONs)
    Patent number: 10142024
    Abstract: An apparatus comprises: a CDR sub-system comprising: an FFE; a decision component coupled to the FFE; a subtractor coupled to the FFE and the decision component; and a tap weight updater coupled to the subtractor and the FFE; and a PR-MLSE component coupled to the CDR sub-system. A method comprises: converting an optical signal with a first modulation format to an analog electrical signal; converting the analog electrical signal to a first digital signal; equalizing the first digital signal into a second digital signal with a second modulation format, wherein the second modulation format has more levels than the first modulation format; and performing CDR on the second digital signal.
    Type: Grant
    Filed: December 14, 2016
    Date of Patent: November 27, 2018
    Assignee: Futurewei Technologies, Inc.
    Inventors: Shuchang Yao, Lei Zhou, Minghui Tao, Xiang Liu, Frank Effenberger
  • Channel Recovery in Burst-Mode, Time-Division Multiplexing (TDM) Passive Optical Networks (PONs)
    Publication number: 20180287706
    Abstract: A transceiver comprises: a sampling phase optimization stage comprising: a first interpolator; a first equalizer coupled to the first interpolator; a first optimizer coupled to the first equalizer; and an output; and an equalization stage coupled to the output and comprising: a buffer; a second interpolator coupled to the buffer; and a second equalizer coupled to the second interpolator. A method comprising: receiving an optical burst signal; determining an optimum sampling phase based on a portion of a digital signal representing the optical burst signal; and equalizing all of the digital signal using the optimum sampling phase.
    Type: Application
    Filed: April 3, 2017
    Publication date: October 4, 2018
    Inventors: Xiang Liu, Frank Effenberger, Huaiyu Zeng, Shuchang Yao, Lei Zhou, Xianbo Dai, Shengming Ma, Lin Huang
  • Higher-Level Clock and Data Recovery (CDR) in Passive Optical Networks (PONs)
    Publication number: 20180167143
    Abstract: An apparatus comprises: a CDR sub-system comprising: an FFE; a decision component coupled to the FFE; a subtractor coupled to the FFE and the decision component; and a tap weight updater coupled to the subtractor and the FFE; and a PR-MLSE component coupled to the CDR sub-system. A method comprises: converting an optical signal with a first modulation format to an analog electrical signal; converting the analog electrical signal to a first digital signal; equalizing the first digital signal into a second digital signal with a second modulation format, wherein the second modulation format has more levels than the first modulation format; and performing CDR on the second digital signal.
    Type: Application
    Filed: December 14, 2016
    Publication date: June 14, 2018
    Inventors: Shuchang Yao, Lei Zhou, Minghui Tao, Xiang Liu, Frank Effenberger