Patents by Inventor Cuihong Zhang
Cuihong 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).
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Publication number: 20230275673Abstract: Disclosed are a signal demodulation method and apparatus, a computer storage medium and a device. The method comprises: acquiring a signal to be demodulated; performing direct current blocking and bias processing on the signal to obtain a processed signal; comparing the processed signal with a preset decision signal, and obtaining a demodulation signal according to a comparison result. Thus, direct current blocking processing on a modulation signal can avoid dynamic changes of DC components caused by average power changes of carrier signals, avoiding wrongly demodulating the modulation signal. Bias processing after the direct current blocking on the modulation signal can further realize an AC signal decision without introducing a negative pressure source. A real-time decision on the processed signal via the preset decision signal can dynamically adapt the average power of carrier signals, thereby ensuring to correctly demodulate the modulation signal and improving the accuracy of demodulation results.Type: ApplicationFiled: December 21, 2020Publication date: August 31, 2023Inventors: Zhi YANG, Cuihong ZHANG, Weidong MA
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Publication number: 20230275657Abstract: Disclosed are an optical fiber time domain reflectometer (OTDR), a test system, test method, and a storage medium. The OTDR comprises: an input end for receiving an input service optical signal; a first filter connected with the input end and for filtering an interference signal with a wavelength equal to a test wavelength of the OTDR in the service optical signal; a wavelength division multiplexing WDM device having a reflection end, a transmission end and an output end; and an OTDR basic unit connected with the transmission end and used for emitting an OTDR signal equal to a test wavelength and receiving a return signal of the OTDR signal, wherein the output end of the WDM device is for outputting a filtered service optical signal received from the reflection end, outputting the OTDR signal received from the transmission end, and receiving the return signal returned from the optical fiber.Type: ApplicationFiled: June 17, 2021Publication date: August 31, 2023Inventors: Cuihong ZHANG, Jiantao ZHANG, Zhijun YE, Tao XIONG
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Patent number: 11251871Abstract: The present disclosure relates to a technical field of optical communication, and provides a method and an apparatus for determining maximum gain of Raman fiber amplifier. Wherein the method includes obtaining transmission performance parameters of a current optical fiber transmission line; respectively obtaining impact factors A1, A2, A4 according to a distance between a joint and a pump source, a fiber loss coefficient, and a fiber length included in the transmission performance parameters; calculating a joint loss value AttAeff according to a distance between a joint and a pump source, a fiber loss coefficient, and looking up impact factor A3 according to AttAeff; determining an actual maximum gain which may actually be achieved by the Raman fiber amplifier according to A1, A2, A3, A4.Type: GrantFiled: December 18, 2018Date of Patent: February 15, 2022Assignee: ACCELINK TECHNOLOGIES CO., LTD.Inventors: Chengpeng Fu, Jintao Tao, Menghui Le, Cuihong Zhang, Di Fang, Qinlian Bu, Chunpin Yu, Fei Liu, Peng Zhang
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Patent number: 11239628Abstract: A method for realizing precise gain control for a hybrid fibre amplifier, and a hybrid fibre amplifier, in which by an erbium-doped fibre amplifier firstly outputting a constant power, a comparable source signal optical power is provided for a raman fibre amplifier of a next stage. A feedback for the gain control may be formed by comparing a source signal optical power calculated after starting pumping of the Raman fibre amplifier and a source signal optical power detected after pumping stops, thereby greatly improving gain control precision of the Raman fibre amplifier. Moreover, the erbium-doped fibre amplifier parts of all the hybrid fibre amplifiers may simultaneously output a constant optical power, and the Raman amplifier parts of all the hybrid fibre amplifiers may simultaneously start calibration, so that the time for starting operation of the entire system may be improved greatly.Type: GrantFiled: December 19, 2016Date of Patent: February 1, 2022Inventors: Jintao Tao, Chengpeng Fu, Cuihong Zhang, Fei Cai, Tao Xiong, Yunyu Jing, Qinlian Bu, Chunping Yu
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Publication number: 20210344163Abstract: Disclosed are a method, device and system for dynamically controlling a gain of a Raman optical fiber amplifier. The method comprises: determining whether a target gain falls within a gain mask range; if the target gain falls within the gain mask range, directly locking a gain to the target gain; and if the target gain falls outside the gain mask range, locking the gain to a corresponding maximum gain in the gain mask range, and gradually increasing the locked gain according to a preset first step length until the target gain is reached or until at least one pump laser reaches a maximum output power. The invention enables an optical fiber amplifier to respond quickly to a change in an input optical signal, ensures gain stability, and ensures that no power overshoot or undershoot occurs in the non-switched optical channels in an optical path. Moreover, the invention minimizes an amount of time required to complete switching between gains.Type: ApplicationFiled: December 26, 2018Publication date: November 4, 2021Applicant: Accelink Technologies Co., LtdInventors: Cuihong ZHANG, Chengpeng FU, Jintao TAO, Hao ZHANG, Lijing CHENG
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Patent number: 11032002Abstract: The present disclosure relates to a signal processing system applied to remove OTDR noise, comprising: an analog-to-digital converter, a laser and driving unit, a sequence accumulator, a preprocessing counter, a pulse generator, a dual-port memory, a self-adaptive filter, an event decision device, and a preprocessing data decision device. The self-adaptive filter reads preprocessing data from a read-only port of the dual-port memory, and performs noise processing on the read preprocessing data by using a self-adaptive filtering method of wavelet transform. The event decision device performs an event decision on the filtered data output from the self-adaptive filter; The preprocessing data decision device decides whether a certain set of preprocessing data in m groups of preprocessing data is correct data or high-signal-to-noise data according to the difference of the m groups of preprocessing data after passing through the event decision device.Type: GrantFiled: December 25, 2017Date of Patent: June 8, 2021Inventors: Peng Zhang, Jiantao Zhang, Cuihong Zhang
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Publication number: 20210083767Abstract: The present disclosure relates to a signal processing system applied to remove OTDR noise, comprising: an analog-to-digital converter, a laser and driving unit, a sequence accumulator, a preprocessing counter, a pulse generator, a dual-port memory, a self-adaptive filter, an event decision device, and a preprocessing data decision device. The self-adaptive filter reads preprocessing data from a read-only port of the dual-port memory, and performs noise processing on the read preprocessing data by using a self-adaptive filtering method of wavelet transform. The event decision device performs an event decision on the filtered data output from the self-adaptive filter; The preprocessing data decision device decides whether a certain set of preprocessing data in m groups of preprocessing data is correct data or high-signal-to-noise data according to the difference of the m groups of preprocessing data after passing through the event decision device.Type: ApplicationFiled: December 25, 2017Publication date: March 18, 2021Applicant: Accelink Technologies Co., Ltd.Inventors: Peng Zhang, Jiantao Zhang, Cuihong Zhang
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Patent number: 10725328Abstract: The present invention relates to a temperature-controlled dimming film with a function of shielding near-infrared light, which comprises a polymer network skeleton and liquid crystal molecules, wherein the polymer network skeleton consists of a polymer-dispersed liquid crystal network structure and a polymer-stabilized liquid crystal network structure and comprises a polymer matrix with pores inside which polymer networks are vertically aligned; and the liquid crystal molecules are dispersed in the polymer network skeleton and have smectic (SmA)-cholesteric (N*) phase transition. Between the skeleton and the liquid crystal molecules, nanoparticles, having absorption at 800-3000 nm, are dispersed. In the invention, a stepwise polymerization method is utilized to construct a PD&SLC network structure between two substrates, which greatly improve the bonding strength between the two substrates and the heat insulation performance of the temperature-controlled liquid crystal dimming film.Type: GrantFiled: June 29, 2017Date of Patent: July 28, 2020Assignee: PEKING UNIVERSITYInventors: Huai Yang, Xiao Liang, Mei Chen, Shumeng Guo, Lanying Zhang, Cuihong Zhang, Qian Wang, Chenyue Li, Cheng Zou
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Patent number: 10686525Abstract: Provided are a control method and system for a cascade hybrid amplifier, in which respective hybrid amplifiers in the cascade hybrid amplifier simultaneously start to implement a pump-starting process comprising: when the hybrid amplifier receives a request to start pumping, determining whether conditions are satisfied, if yes, determining stability of power of an input light of a Raman, starting pumping of an EDFA so that the EDFA enters into an APC operation mode; starting pumping of the Raman, and calculating a gain deviation according to the calculated input light powers before and after pump-starting of the Raman when no reflection alarm exists; and adjusting gain of the Raman according to the gain deviation, and switching to an AGC (automatic gain control) operation mode after the adjustment; and switching the EDFA to the AGC operation mode.Type: GrantFiled: December 18, 2015Date of Patent: June 16, 2020Assignee: Accelink Technologies Co., Ltd.Inventors: Yunyu Jing, Chengpeng Fu, Jintao Tao, Cuihong Zhang, Tao Xiong, Zhi Yang
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Publication number: 20200007238Abstract: The present disclosure relates to a technical field of optical communication, and provides a method and an apparatus for determining maximum gain of Raman fiber amplifier. Wherein the method includes obtaining transmission performance parameters of a current optical fiber transmission line; respectively obtaining impact factors A1, A2, A4 according to a distance between a joint and a pump source, a fiber loss coefficient, and a fiber length included in the transmission performance parameters; calculating a joint loss value AttAeff according to a distance between a joint and a pump source, a fiber loss coefficient, and looking up impact factor A3 according to AttAeff; determining an actual maximum gain which may actually be achieved by the Raman fiber amplifier according to A1, A2, A3, A4.Type: ApplicationFiled: December 18, 2018Publication date: January 2, 2020Applicant: ACCELINK TECHNOLOGIES CO., LTD.Inventors: Chengpeng Fu, Jintao Tao, Menghui Le, Cuihong Zhang, Di Fang, Qinlian Bu, Chunpin Yu, Fei Liu, Peng Zhang
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Publication number: 20190310499Abstract: The present invention relates to a temperature-controlled dimming film with a function of shielding near-infrared light, which comprises a polymer network skeleton and liquid crystal molecules, wherein the polymer network skeleton consists of a polymer-dispersed liquid crystal network structure and a polymer-stabilized liquid crystal network structure and comprises a polymer matrix with pores inside which polymer networks are vertically aligned; and the liquid crystal molecules are dispersed in the polymer network skeleton and have smectic (SmA)-cholesteric (N*) phase transition. Between the skeleton and the liquid crystal molecules, nanoparticles, having absorption at 800-3000 nm, are dispersed. In the invention, a stepwise polymerization method is utilized to construct a PD&SLC network structure between two substrates, which greatly improve the bonding strength between the two substrates and the heat insulation performance of the temperature-controlled liquid crystal dimming film.Type: ApplicationFiled: June 29, 2017Publication date: October 10, 2019Applicant: PEKING UNIVERSITYInventors: Huai YANG, Xiao LIANG, Mei CHEN, Shumeng GUO, Lanying ZHANG, Cuihong ZHANG, Qian WANG, Chenyue LI, Cheng ZOU
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Patent number: 10439354Abstract: A cascade control system of an optical fiber amplifier includes a target setting parameter module, a primary controller, at least one controlled module and a secondary controller corresponding to the controlled module. The control system adopts two or more cascade control loops so that disturbance entering into the secondary loop can be overcome quickly, thereby the dynamic characteristics of the system may be improved. The primary controller aims to coarse adjustment and overall target control, and the secondary controller aims to fine adjustment and quick convergence of a short-term target, so that the control quality of the cascade control system may be further improved. The cascade control system may define the overall control target directly in the primary loop and avoid impact of aging characteristics of some special parameters on the application.Type: GrantFiled: December 26, 2014Date of Patent: October 8, 2019Assignee: Accelink Technologies Co., Ltd.Inventors: Peng Zhang, Chengpeng Fu, Chunping Yu, Jintao Tao, Cuihong Zhang
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Publication number: 20190131758Abstract: A method for realizing precise gain control for a hybrid fibre amplifier, and a hybrid fibre amplifier, in which by an erbium-doped fibre amplifier firstly outputting a constant power, a comparable source signal optical power is provided for a raman fibre amplifier of a next stage. A feedback for the gain control may be formed by comparing a source signal optical power calculated after starting pumping of the Raman fibre amplifier and a source signal optical power detected after pumping stops, thereby greatly improving gain control precision of the Raman fibre amplifier. Moreover, the erbium-doped fibre amplifier parts of all the hybrid fibre amplifiers may simultaneously output a constant optical power, and the Raman amplifier parts of all the hybrid fibre amplifiers may simultaneously start calibration, so that the time for starting operation of the entire system may be improved greatly.Type: ApplicationFiled: December 19, 2016Publication date: May 2, 2019Applicant: Accelink Technologies Co., Ltd.Inventors: Jintao Tao, Chengpeng Fu, Cuihong Zhang, Fei Cai, Tao Xiong, Yunyu Jing, Qinlian Bu, Chunping Yu
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Publication number: 20180241473Abstract: Provided are a control method and system for a cascade hybrid amplifier, in which respective hybrid amplifiers in the cascade hybrid amplifier simultaneously start to implement a pump-starting process comprising: when the hybrid amplifier receives a request to start pumping, determining whether conditions are satisfied, if yes, determining stability of power of an input light of a Raman, starting pumping of an EDFA so that the EDFA enters into an APC operation mode; starting pumping of the Raman, and calculating a gain deviation according to the calculated input light powers before and after pump-starting of the Raman when no reflection alarm exists; and adjusting gain of the Raman according to the gain deviation, and switching to an AGC (automatic gain control) operation mode after the adjustment; and switching the EDFA to the AGC operation mode.Type: ApplicationFiled: December 18, 2015Publication date: August 23, 2018Applicant: Accelink Technologies Co., Ltd.Inventors: Yunyu Jing, Chengpeng Fu, Jintao Tao, Cuihong Zhang, Tao Xiong, Zhi Yang
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Publication number: 20170324210Abstract: A cascade control system of an optical fiber amplifier includes a target setting parameter module, a primary controller, at least one controlled module and a secondary controller corresponding to the controlled module. The control system adopts two or more cascade control loops so that disturbance entering into the secondary loop can be overcome quickly, thereby the dynamic characteristics of the system may be improved. The primary controller aims to coarse adjustment and overall target control, and the secondary controller aims to fine adjustment and quick convergence of a short-term target, so that the control quality of the cascade control system may be further improved. The cascade control system may define the overall control target directly in the primary loop and avoid impact of aging characteristics of some special parameters on the application.Type: ApplicationFiled: December 26, 2014Publication date: November 9, 2017Applicant: Accelink Technologies Co., Ltd.Inventors: Peng Zhang, Chengpeng Fu, Chunping Yu, Jintao Tao, Cuihong Zhang
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Patent number: 9722559Abstract: A hybrid fiber amplifier and method of adjusting gain and gain slope of thereof. The hybrid fiber amplifier comprises: RFA and EDFA that does not comprise variable optical attenuator. The RFA comprises pump signal combiner, pump laser group, out-of-band narrow-band filter, and photodetector. The EDFA comprises input coupler, erbium-doped fiber, output coupler, input photodetector, and output photodetector that are connected in sequence. The hybrid fiber amplifier also comprises control module that coordinates and controls EDFA and/or RFA to adjust gain and/or the gain slope based on desired amplification requirements. The EDFA and/or RFA can be coordinated and controlled by using the control module to achieve desired amplification effect. In addition, the EDFA does not comprise the variable optical attenuator, which avoids problems caused by the variable optical attenuator.Type: GrantFiled: September 27, 2012Date of Patent: August 1, 2017Assignee: Accelink Technologies Co., Ltd.Inventors: Chengpeng Fu, Cuihong Zhang, Tao Xiong, Menghui Le, Jintao Tao, Zhenyu Yu, Yunyu Jing, Qinlian Bu, Chunping Yu
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Publication number: 20150214913Abstract: A hybrid fiber amplifier and method of adjusting gain and gain slope of thereof. The hybrid fiber amplifier comprises: RFA and EDFA that does not comprise variable optical attenuator. The RFA comprises pump signal combiner, pump laser group, out-of-band narrow-band filter, and photodetector. The EDFA comprises input coupler, erbium-doped fiber, output coupler, input photodetector, and output photodetector that are connected in sequence. The hybrid fiber amplifier also comprises control module that coordinates and controls EDFA and/or RFA to adjust gain and/or the gain slope based on desired amplification requirements. The EDFA and/or RFA can be coordinated and controlled by using the control module to achieve desired amplification effect. In addition, the EDFA does not comprise the variable optical attenuator, which avoids problems caused by the variable optical attenuator.Type: ApplicationFiled: September 27, 2012Publication date: July 30, 2015Applicant: Accelink Technologies Co., Ltd.Inventors: Chengpeng Fu, Cuihong Zhang, Tao Xiong, Menghui Le, Jintao Tao, Zhenyu Yu, Yunyu Jing, Qinlian Bu, Chunping Yu
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Patent number: 8797640Abstract: An embodiment of the present invention discloses a method of performing target Raman gain locking and a Raman fiber amplifier. The Raman fiber amplifier comprises a coupler (1) and a control unit (15), wherein the control unit comprises a target gain locking module. A detection circuit formed by filters and optical power detectors is connected between an output side of the coupler (1) and an input side of the control unit (15). Said method uses the control unit (15) to adjust power of the pump laser, making the detected out-of-band ASE power value reach target out-of-band ASE optical signal power value. Thus, the target amplification gain locking can be realized. Optical path according to embodiments of the present invention has a simple structure. The Raman gain can be configured flexibly according to line condition, and automatic control and locking of gain of the Raman fiber amplifier can be realized.Type: GrantFiled: December 12, 2011Date of Patent: August 5, 2014Assignee: Accelink Technologies Co., LtdInventors: Chengpeng Fu, Peng Zhang, Yi Jiang, Chunping Yu, Cuihong Zhang
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Publication number: 20120327505Abstract: An embodiment of the present invention discloses a method of performing target Raman gain locking and a Raman fiber amplifier. The Raman fiber amplifier comprises a coupler (1) and a control unit (15), wherein the control unit comprises a target gain locking module. A detection circuit formed by filters and optical power detectors is connected between an output side of the coupler (1) and an input side of the control unit (15). Said method uses the control unit (15) to adjust power of the pump laser, making the detected out-of-band ASE power value reach target out-of-band ASE optical signal power value. Thus, the target amplification gain locking can be realized. Optical path according to embodiments of the present invention has a simple structure. The Raman gain can be configured flexibly according to line condition, and automatic control and locking of gain of the Raman fiber amplifier can be realized.Type: ApplicationFiled: December 12, 2011Publication date: December 27, 2012Inventors: Chengpeng FU, Peng Zhang, Yi Jiang, Chunping Yu, Cuihong Zhang