Patents by Inventor Zhuhong Zhang

Zhuhong Zhang 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: 20200129970
    Abstract: A method for preparing a two-dimensional sheet-shaped Cu-MOF material, includes mixing Cu-BTC with an alkaline solution at a certain solid-liquid ratio by stirring, reacting at a temperature of 25 to 120° C., filtering, washing with ionized water and drying under vacuum, to obtain a two-dimensional sheet-shaped Cu-MOF material, wherein the alkaline solution is at least one of urea, sodium carbonate, sodium bicarbonate, aqueous ammonia, sodium hydroxide or potassium hydroxide. The method has the characteristics of mild operation conditions, controllable transition process, high reaction yield and easy production at large scale, and exhibits excellent oxidation performance in styrene oxidation.
    Type: Application
    Filed: July 20, 2018
    Publication date: April 30, 2020
    Applicant: NANJING TECH UNIVERSITY
    Inventors: Hang LI, Xiangyue XU, Suoying ZHANG, Zhuhong YANG, Xiaohua LU
  • Publication number: 20200123525
    Abstract: The present invention provides engineered polypeptides that are useful for the asymmetric synthesis of ?-hydroxy-?-amino acids under industrial-relevant conditions. The present disclosure also provides polynucleotides encoding engineered polypeptides, host cells capable of expressing engineered polypeptides, and methods of producing ?-hydroxy-?-amino acids using engineered polypeptides. Compared to other processes of preparation, the use of the engineered polypeptides of the present invention for the preparation of ?-hydroxy-?-amino acids results in high purity of the desired stereoisomers, mild reaction conditions, low pollution and low energy consumption. So, it has good industrial application prospects.
    Type: Application
    Filed: May 9, 2018
    Publication date: April 23, 2020
    Applicant: Enzymaster (Ningbo) Bio-Engineering Co., Ltd
    Inventors: Haibin CHEN, Yong Koy BONG, Baoqin CAI, Qing XU, Tianran SHEN, Ameng q ZHOU, Jiadong YANG, Zhuhong YANG, Yaoyao JI, Yingxin ZHANG
  • Patent number: 10615881
    Abstract: Systems and methods are provided for adaptive equalization, for example for use with coherent optical reception. The equalizer has a loop for updating taps of an adaptive linear filter forming part of the equalizer. In the loop, an error calculator calculates an error, a gradient calculator calculates a gradient of the error or filtered error. One or more gradient filters are used to filter the gradient, and the filtered gradient is used to update the taps of the adaptive linear filter. A reduction in self oscillation in the equalizer is achieved by separating the frequencies with channel features that change with time and scaling them up to speed up convergence of the equalizer.
    Type: Grant
    Filed: March 15, 2019
    Date of Patent: April 7, 2020
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Nash'at Abughalieh, Zhuhong Zhang
  • Publication number: 20200106648
    Abstract: Apparatus and methods are provided for noise-whitening post-compensation in a receiver. A first apparatus includes a first whitening filter configured to filter a received signal comprising symbols to generate a first filtered signal. The first apparatus further includes a first decision feedback equalizer having an input coupled to an output of the first whitening filter to receive the first filtered signal. The first decision feedback equalizer is configured to apply decision feedback equalization to the first filtered signal to generate estimates for the symbols of the received signal. A second apparatus includes a decision device configured to generate a symbols decision based on a received signal comprising symbols, a noise predictor configured to predict noise in the received signal, and a subtractor configured to subtract the predicted noise from the received signal to generate a symbols estimate.
    Type: Application
    Filed: September 28, 2018
    Publication date: April 2, 2020
    Applicant: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: AHMED MOHAMED IBRAHIM MEDRA, HOSSEIN NAJAFI, ZHUHONG ZHANG
  • Patent number: 10574382
    Abstract: An embodiment method includes multiplexing light emitted by the plurality of optical transmitters to provide a multiplexed optical signal; propagating the multiplexed optical signal through an optical interleaver from a first port thereof to a combined port thereof and back to a second port thereof; and detecting an optical signal at the second port of the optical interleaver.
    Type: Grant
    Filed: June 1, 2018
    Date of Patent: February 25, 2020
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Zhiping Jiang, Xuefeng Tang, Zhuhong Zhang
  • 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: 10491432
    Abstract: A symbol detection and forward error correction (FEC) decoding system and method are disclosed that aim to increase decoding performance and maintain an acceptable level of complexity. In one embodiment, the method includes performing detection and decoding over a plurality of iterations. During the first iteration: a first equalizer structure processes a received signal, and a FEC decoder performs decoding on an input obtained from the output of the first equalizer structure. During the other iterations: an iterative equalizer structure processes both (i) the received signal and (ii) an input obtained from an output of the FEC decoder from a previous iteration of the detection and decoding, in order to generate an output of the iterative equalizer structure, and the FEC decoder performs FEC decoding on an input obtained from the output of the iterative equalizer structure.
    Type: Grant
    Filed: October 1, 2018
    Date of Patent: November 26, 2019
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Ahmed Mohamed Ibrahim Medra, Hossein Najafi, Zhuhong Zhang
  • Publication number: 20190296832
    Abstract: Systems and methods are provided for adaptive equalization, for example for use with coherent optical reception. The equalizer has a loop for updating taps of an adaptive linear filter forming part of the equalizer. In the loop, an error calculator calculates an error, a gradient calculator calculates a gradient of the error or filtered error. One or more gradient filters are used to filter the gradient, and the filtered gradient is used to update the taps of the adaptive linear filter. A reduction in self oscillation in the equalizer is achieved by separating the frequencies with channel features that change with time and scaling them up to speed up convergence of the equalizer.
    Type: Application
    Filed: March 15, 2019
    Publication date: September 26, 2019
    Applicant: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: NASH'AT ABUGHALIEH, ZHUHONG ZHANG
  • 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
  • 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
  • Publication number: 20190109667
    Abstract: An embodiment method includes multiplexing light emitted by the plurality of optical transmitters to provide a multiplexed optical signal; propagating the multiplexed optical signal through an optical interleaver from a first port thereof to a combined port thereof and back to a second port thereof; and detecting an optical signal at the second port of the optical interleaver.
    Type: Application
    Filed: June 1, 2018
    Publication date: April 11, 2019
    Inventors: Zhiping Jiang, Xuefeng Tang, Zhuhong Zhang
  • 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