Patents by Inventor Chuandong Li

Chuandong Li 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).

  • Patent number: 10686547
    Abstract: A method includes distributing payload data among a master sub-band and a plurality of slave sub-bands. The master sub-band and the plurality of slave sub-bands collectively extend over an allocated frequency spectrum; the master sub-band and the plurality of slave sub-bands are associated with different carrier frequencies; and the master sub-band has a center frequency that corresponds to a center frequency of the allocated frequency spectrum. The method includes generating modulated data for the master sub-band and the plurality of slave sub-bands based on the distributed payload data; and transmitting an optical signal to an optical medium representing the modulated data.
    Type: Grant
    Filed: March 7, 2019
    Date of Patent: June 16, 2020
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Chuandong Li, Zhuhong Zhang
  • Patent number: 10680718
    Abstract: Aspects of the present disclosure are directed in part to a receiver DSP unit including an equalization module. The equalization module includes a trellis-based equalization module that may utilize multiple trellis-based processors (TBP), which can each be individually adaptively configured for performing a trellis-based equalization. The design of the TBPs allows them to be configured for compensating a residual Inter-Symbol Interference (ISI) as well as compensating a residual Phase Noise (PN). ISI is an example of an additive impairment and PN is an example of a multiplicative impairment that communication systems, particularly high speed transmission systems such as coherent optical systems, can suffer from.
    Type: Grant
    Filed: March 5, 2019
    Date of Patent: June 9, 2020
    Assignee: Huawei Technologies, Co., Ltd.
    Inventors: Mahdi Zamani, Jeebak Mitra, Hossein Najafi, Zhuhong Zhang, Chuandong Li
  • Patent number: 10673528
    Abstract: The disclosed systems, apparatuses and methods are directed to controlling optical channel signal and an optical network equipment in optical networks. The methods comprise adjusting an optical channel spectrum based on bit error rates (BER) measured for a dithered optical channel signal. The optical channel spectrum is dithered such that a signal reference frequency is alternated between a first second signal reference frequency and a second signal reference frequency. BER is measured and analysed separately for the dithered signal reference frequency being detuned to the first and to the second signal reference frequencies. Based on a BER difference between BER at the first signal reference frequency and BER at the second signal reference frequency, the optical channel spectrum is shifted with regards to frequency in order to improve optical network performance.
    Type: Grant
    Filed: February 25, 2019
    Date of Patent: June 2, 2020
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Zhiping Jiang, Chuandong Li, Zhuhong Zhang
  • Publication number: 20200128786
    Abstract: The present application discloses an interactive intelligent pet feeding device which belongs to the technical field of pet feeding devices, including a feeding device body, the feeding device body including a pet food feeding control device and a shake detection module, the pet food feeding control device being configured to realize quantitative feeding of pet food and prevent jamming of the pet food, the shake detection module being configured to detect the motion state of the feeding device body, the shake detection module being connected to a control module to implement data communication, and the control module implementing data communication with a mobile terminal through a wireless transmission module.
    Type: Application
    Filed: April 18, 2018
    Publication date: April 30, 2020
    Applicant: DONGGUAN CXM TECHNOLOGY CO., LTD
    Inventors: Jie JI, Fengyuan YANG, Fan LIU, Hao LI, Chuandong ZHANG, Huali DING, Zhipeng HU, Chen CHEN
  • Patent number: 10506311
    Abstract: An optical circuit switching matrix includes a plurality of optical ports, each optical port being optically coupled to a respective one of a plurality of user nodes and an optical coupler having at least one input port optically coupled to the plurality of optical ports, and an output port. The optical circuit switching matrix also includes a wavelength demultiplexer having an input optically coupled to the output port of the optical coupler, and a plurality of output ports, each output port being optically coupled to a respective one of the plurality of optical ports.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: December 10, 2019
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Zhiping Jiang, Chen Chen, Zhuhong Zhang, Chuandong Li
  • Patent number: 10505768
    Abstract: An apparatus in a signal receiver, such as an optical signal receiver, is provided. An adaptive equalizer provides an equalized output indicative of a received signal. A feedback component receives the equalized output and provides feedback to the adaptive equalizer. A carrier recovery component receives the equalized output from the adaptive equalizer provides estimates of symbols. The carrier recovery component is partially or fully disjoint from the feedback component, thus removing the carrier recovery component from equalizer the feedback loop. The feedback component can include an initial carrier recovery component and a phase rotation and detection component. The initial carrier recovery component generates a carrier recovery output based on the equalized output. The phase rotation and detection component performs a phase rotation based on the carrier recovery output.
    Type: Grant
    Filed: December 12, 2017
    Date of Patent: December 10, 2019
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Nash'at Abughalieh, Syed Faisal Ali Shah, Chuandong Li
  • Publication number: 20190199443
    Abstract: Aspects of the present disclosure are directed in part to a receiver DSP unit including an equalization module. The equalization module includes a trellis-based equalization module that may utilize multiple trellis-based processors (TBP), which can each be individually adaptively configured for performing a trellis-based equalization. The design of the TBPs allows them to be configured for compensating a residual Inter-Symbol Interference (ISI) as well as compensating a residual Phase Noise (PN). ISI is an example of an additive impairment and PN is an example of a multiplicative impairment that communication systems, particularly high speed transmission systems such as coherent optical systems, can suffer from.
    Type: Application
    Filed: March 5, 2019
    Publication date: June 27, 2019
    Inventors: Mahdi Zamani, Jeebak Mitra, Hossein Najafi, Zhuhong Zhang, Chuandong Li
  • Publication number: 20190182082
    Abstract: An apparatus in a signal receiver, such as an optical signal receiver, is provided. An adaptive equalizer provides an equalized output indicative of a received signal. A feedback component receives the equalized output and provides feedback to the adaptive equalizer. A carrier recovery component receives the equalized output from the adaptive equalizer provides estimates of symbols. The carrier recovery component is partially or fully disjoint from the feedback component, thus removing the carrier recovery component from equalizer the feedback loop. The feedback component can include an initial carrier recovery component and a phase rotation and detection component. The initial carrier recovery component generates a carrier recovery output based on the equalized output. The phase rotation and detection component performs a phase rotation based on the carrier recovery output.
    Type: Application
    Filed: December 12, 2017
    Publication date: June 13, 2019
    Applicant: Huawei Technologies Co., Ltd.
    Inventors: Nash'at Abughalieh, Syed Faisal Ali Shah, Chuandong Li
  • Patent number: 10298323
    Abstract: The disclosure is directed to a method and system for generating a pilot tone for an optical signal with an optical telecommunications system. The pilot tone is generated in the digital domain by modulating the data to be transmitted to a destination node within the optical telecommunications network. The modulation of the data introduces occurrence modulation to the optical signal.
    Type: Grant
    Filed: February 13, 2018
    Date of Patent: May 21, 2019
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Zhiping Jiang, Zhuhong Zhang, Chuandong Li
  • Patent number: 10263699
    Abstract: The disclosure is directed to a method and system for generating a pilot tone for an optical signal with an optical telecommunications system. The pilot tone is generated in the digital domain by modulating the data to be transmitted to a destination node within the optical telecommunications network. The modulation of the data introduces occurrence modulation to the optical signal.
    Type: Grant
    Filed: February 13, 2018
    Date of Patent: April 16, 2019
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Zhiping Jiang, Zhuhong Zhang, Chuandong Li
  • Patent number: 10187155
    Abstract: An optical transceiver is provided with an optical front end for receiving signal light comprising an optical sub-channel, and for providing an electrical signal based on the signal light; a light source optically coupled to the optical front end for providing local oscillator light thereto for mixing with the signal light; an electro-optical modulator coupled to the light source for receiving output light therefrom and for modulating the output light with digital information to obtain modulated light; and a signal processor operably coupled to the optical front end. The signal processor is configured for processing the electrical signal to obtain a frequency offset of the sub-channel; and adjusting an optical frequency of the modulated light based on the frequency offset. When applied to a multiple-access environment, this may allow access nodes to generate optical sub-channels in the uplink direction using the downlink optical signal as an optical frequency reference.
    Type: Grant
    Filed: November 15, 2016
    Date of Patent: January 22, 2019
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Zhiping Jiang, Chuandong Li, Zhuhong Zhang, Xuefeng Tang
  • Publication number: 20180183518
    Abstract: The disclosure is directed to a method and system for generating a pilot tone for an optical signal with an optical telecommunications system. The pilot tone is generated in the digital domain by modulating the data to be transmitted to a destination node within the optical telecommunications network. The modulation of the data introduces occurrence modulation to the optical signal.
    Type: Application
    Filed: February 13, 2018
    Publication date: June 28, 2018
    Applicant: Huawei Technologies Co., Ltd.
    Inventors: Zhiping JIANG, Zhuhong ZHANG, Chuandong LI
  • Patent number: 9998274
    Abstract: An optical channel between a coherent optical transmitter and a coherent optical receiver may include one or more components that act as a bandpass filter with a passband that is narrower than the signal bandwidth. Such a narrow filter may significantly attenuate the signal content close to the band edge of the data signal. As a result, timing error detection may work less effectively, and therefore clock recovery may be less effective or fail. Methods and systems are disclosed in which a single optical carrier is used to transmit a data signal that has multiple bands, and timing error detection is performed at the receiver using one or more inner bands of the multiple bands. The timing error detection may therefore be made more robust to the effects of the narrow filtering.
    Type: Grant
    Filed: November 16, 2016
    Date of Patent: June 12, 2018
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Mahdi Zamani, Mehdi Torbatian, Jeebak Mitra, Zhuhong Zhang, Chuandong Li
  • Publication number: 20180138980
    Abstract: An optical transceiver is provided with an optical front end for receiving signal light comprising an optical sub-channel, and for providing an electrical signal based on the signal light; a light source optically coupled to the optical front end for providing local oscillator light thereto for mixing with the signal light; an electro-optical modulator coupled to the light source for receiving output light therefrom and for modulating the output light with digital information to obtain modulated light; and a signal processor operably coupled to the optical front end. The signal processor is configured for processing the electrical signal to obtain a frequency offset of the sub-channel; and adjusting an optical frequency of the modulated light based on the frequency offset. When applied to a multiple-access environment, this may allow access nodes to generate optical sub-channels in the uplink direction using the downlink optical signal as an optical frequency reference.
    Type: Application
    Filed: November 15, 2016
    Publication date: May 17, 2018
    Applicant: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: ZHIPING JIANG, CHUANDONG LI, ZHUHONG ZHANG, XUEFENG TANG
  • Publication number: 20180091288
    Abstract: An optical channel between a coherent optical transmitter and a coherent optical receiver may include one or more components that act as a bandpass filter with a passband that is narrower than the signal bandwidth. Such a narrow filter may significantly attenuate the signal content close to the band edge of the data signal. As a result, timing error detection may work less effectively, and therefore clock recovery may be less effective or fail. Methods and systems are disclosed in which a single optical carrier is used to transmit a data signal that has multiple bands, and timing error detection is performed at the receiver using one or more inner bands of the multiple bands. The timing error detection may therefore be made more robust to the effects of the narrow filtering.
    Type: Application
    Filed: November 16, 2016
    Publication date: March 29, 2018
    Inventors: Mahdi Zamani, Mehdi Torbatian, Jeebak Mitra, Zhuhong Zhang, Chuandong Li
  • Patent number: 9929805
    Abstract: The disclosure is directed to a method and system for generating a pilot tone for an optical signal with an optical telecommunications system. The pilot tone is generated in the digital domain by modulating the data to be transmitted to a destination node within the optical telecommunications network. The modulation of the data introduces occurrence modulation to the optical signal.
    Type: Grant
    Filed: May 11, 2016
    Date of Patent: March 27, 2018
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Zhiping Jiang, Zhuhong Zhang, Chuandong Li
  • Patent number: 9871597
    Abstract: A method and apparatus is described for estimating a local oscillator frequency offset (LOFO) of a received optical signal in a coherent optical receiver.
    Type: Grant
    Filed: April 11, 2016
    Date of Patent: January 16, 2018
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Mohsen Nader Tehrani, Syed Faisal Ali Shah, Zhuhong Zhang, Chuandong Li
  • Publication number: 20170331551
    Abstract: The disclosure is directed to a method and system for generating a pilot tone for an optical signal with an optical telecommunications system. The pilot tone is generated in the digital domain by modulating the data to be transmitted to a destination node within the optical telecommunications network. The modulation of the data introduces occurrence modulation to the optical signal.
    Type: Application
    Filed: May 11, 2016
    Publication date: November 16, 2017
    Inventors: Zhiping JIANG, Zhuhong ZHANG, Chuandong LI
  • Patent number: 9813087
    Abstract: A digital signal processing apparatus and method is described for a transmitter of a communication link. The digital signal processing apparatus comprises a pre-compensation filter for boosting power of a signal to be transmitted within two predetermined frequency bands. One of the predetermined frequency bands is centered around a clock tone frequency of fbaud/2, and the other one of the predetermined frequency bands is centered around a clock tone frequency of ?fbaud/2, fbaud being a baud rate of the transmitted signal.
    Type: Grant
    Filed: October 28, 2015
    Date of Patent: November 7, 2017
    Assignee: Huawei Techonologies Co., Ltd.
    Inventors: Mehdi Torbatian, Zhuhong Zhang, Chuandong Li
  • Patent number: 9800348
    Abstract: An apparatus comprises a front end configured to receive an optical signal, and convert the optical signal into a plurality of digital signals, and a processing unit coupled to the front end and configured to determine a best-match chromatic dispersion (CD) estimate in the optical signal by optimizing a cost function based on signal peaks of the plurality of digital signals.
    Type: Grant
    Filed: November 18, 2014
    Date of Patent: October 24, 2017
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Mahdi Zamani, Zhuhong Zhang, Chuandong Li