Patents by Inventor Yangyang FAN
Yangyang FAN 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: 20230327759Abstract: Embodiments of this disclosure provide a measurement apparatus and method for nonlinear damages in an optical link. The apparatus may include a processor to control execution of a process to generate multiple band-notch signals with different band-notch widths corresponding to a frequency point to be measured; and calculate respective multiple nonlinear noise-to-power ratios at the frequency point to be measured according to multiple band-notch signals obtained after the multiple band-notch signals with different band-notch widths pass through the optical link. A real nonlinear noise-to-power ratio may be extrapolated at the frequency point to be measured according to the multiple nonlinear noise-to-power ratios corresponding to the multiple band-notch signals with different band-notch widths.Type: ApplicationFiled: March 10, 2023Publication date: October 12, 2023Applicant: Fujitsu LimitedInventors: Yangyang FAN, Zhenning TAO
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Polarization change tracking apparatus, processing apparatus for received signal and methods thereof
Patent number: 11777613Abstract: A polarization change tracking apparatus, a processing apparatus for a received signal and methods thereof. The polarization change tracking method includes: estimating a polarization change speed in a link according to a received signal; setting a response coefficient of polarization tracking according to a relationship between an estimated polarization change speed and a predetermined value, to make a response of polarization tracking and a response of adaptive equalization be consecutive; and performing compensation for polarization change on the received signal according to a set response coefficient of polarization tracking.Type: GrantFiled: December 29, 2021Date of Patent: October 3, 2023Assignee: FUJITSU LIMITEDInventors: Jingnan Li, Yangyang Fan, Zhenning Tao -
Patent number: 11626930Abstract: A polarization recovery apparatus, a method thereof and an optical receiver. The method includes: performing adaptive equalization processing and polarization recovery on a received signal, wherein a polarization state of the received signal, after the adaptive equalization processing and polarization recovery being performed, is aligned with a principal axis of polarization of an optical receiver.Type: GrantFiled: December 29, 2021Date of Patent: April 11, 2023Assignee: FUJITSU LIMITEDInventors: Jingnan Li, Yangyang Fan, Zhenning Tao
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Patent number: 11563496Abstract: An apparatus at least includes a processor to, after a first signal passes through a narrowband photodetector, perform frequency mix of the first signal with a first reference signal and a second reference signal respectively and perform noise reduction, to obtain a first detection signal and a second detection signal. The first signal is obtained after a measurement signal passes through a filtering module of an optical transmitting end, the measurement signal being transmitted in a path of multiple branches, signals not transmitted in other paths of the multiple branches, a frame structure of the measurement signal including at least one two-tone signal, two tones in the two-tone signal having a fixed tone interval.Type: GrantFiled: September 29, 2021Date of Patent: January 24, 2023Assignee: Fujitsu LimitedInventors: Yangyang Fan, Zhenning Tao
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Patent number: 11463172Abstract: An apparatus and method to monitor a polarization change by inserting pilot signals in a transmission signal and converting the pilot signals in the receiving signal from a Jones space into a Stokes space. A velocity of a polarization change of the optical link is estimated by using the Stokes vectors of the pilot signals, thereby directly and accurately estimating the polarization change of the optical link. Moreover, estimation of the velocity of the polarization may be applicable where rotation of state of polarization and polarization-dependent loss coexist in an optical link.Type: GrantFiled: October 1, 2021Date of Patent: October 4, 2022Assignee: FUJITSU LIMITEDInventors: Jingnan Li, Yangyang Fan, Zhenning Tao
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Publication number: 20220255630Abstract: A polarization recovery apparatus, a method thereof and an optical receiver. The method includes: performing adaptive equalization processing and polarization recovery on a received signal, wherein a polarization state of the received signal, after the adaptive equalization processing and polarization recovery being performed, is aligned with a principal axis of polarization of an optical receiver.Type: ApplicationFiled: December 29, 2021Publication date: August 11, 2022Applicant: FUJITSU LIMITEDInventors: Jingnan LI, Yangyang FAN, Zhenning TAO
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POLARIZATION CHANGE TRACKING APPARATUS, PROCESSING APPARATUS FOR RECEIVED SIGNAL AND METHODS THEREOF
Publication number: 20220255631Abstract: A polarization change tracking apparatus, a processing apparatus for a received signal and methods thereof. The polarization change tracking method includes: estimating a polarization change speed in a link according to a received signal; setting a response coefficient of polarization tracking according to a relationship between an estimated polarization change speed and a predetermined value, to make a response of polarization tracking and a response of adaptive equalization be consecutive; and performing compensation for polarization change on the received signal according to a set response coefficient of polarization tracking.Type: ApplicationFiled: December 29, 2021Publication date: August 11, 2022Applicant: FUJITSU LIMITEDInventors: Jingnan LI, Yangyang FAN, Zhenning TAO -
Publication number: 20220149941Abstract: An apparatus and method to monitor a polarization change by inserting pilot signals in a transmission signal and converting the pilot signals in the receiving signal from a Jones space into a Stokes space. A velocity of a polarization change of the optical link is estimated by using the Stokes vectors of the pilot signals, thereby directly and accurately estimating the polarization change of the optical link. Moreover, estimation of the velocity of the polarization may be applicable where rotation of state of polarization and polarization-dependent loss coexist in an optical link.Type: ApplicationFiled: October 1, 2021Publication date: May 12, 2022Applicant: Fujitsu LimitedInventors: Jingnan LI, Yangyang FAN, Zhenning TAO
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Patent number: 11329724Abstract: A state of polarization tracking recovery method and apparatus. The apparatus at least includes a processor configured to fit Stokes vectors to which predetermined symbols correspond of two states of polarization in a received dual-polarization multiplexing optical signal on a Poincare sphere to obtain a fitted plane. The processor calculates a compensation matrix for polarization-dependent loss (PDL) in a Jones space by moving a center of the fitted plane to the origin of the Poincare sphere, and calculates a demultiplexing matrix used for polarization demultiplexing in a Jones space by rotating the fitted plane with the center being moved to the origin until a normal vector of the fitted plane is parallel with a first axis of the Stokes space and rotating the fitted plane with the center being moved to the origin to a plane constituted by a second axis and a third axis of the Stokes space.Type: GrantFiled: May 17, 2021Date of Patent: May 10, 2022Assignee: FUJITSU LIMITEDInventors: Yangyang Fan, Jingnan Li, Zhenning Tao
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Publication number: 20220140912Abstract: An apparatus at least includes a processor to, after a first signal passes through a narrowband photodetector, perform frequency mix of the first signal with a first reference signal and a second reference signal respectively and perform noise reduction, to obtain a first detection signal and a second detection signal. The first signal is obtained after a measurement signal passes through a filtering module of an optical transmitting end, the measurement signal being transmitted in a path of multiple branches, signals not transmitted in other paths of the multiple branches, a frame structure of the measurement signal including at least one two-tone signal, two tones in the two-tone signal having a fixed tone interval.Type: ApplicationFiled: September 29, 2021Publication date: May 5, 2022Applicant: Fujitsu LimitedInventors: Yangyang FAN, Zhenning TAO
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Publication number: 20210399803Abstract: A state of polarization tracking recovery method and apparatus. The apparatus at least includes a processor configured to fit Stokes vectors to which predetermined symbols correspond of two states of polarization in a received dual-polarization multiplexing optical signal on a Poincare sphere to obtain a fitted plane. The processor calculates a compensation matrix for polarization-dependent loss (PDL) in a Jones space by moving a center of the fitted plane to the origin of the Poincare sphere, and calculates a demultiplexing matrix used for polarization demultiplexing in a Jones space by rotating the fitted plane with the center being moved to the origin until a normal vector of the fitted plane is parallel with a first axis of the Stokes space and rotating the fitted plane with the center being moved to the origin to a plane constituted by a second axis and a third axis of the Stokes space.Type: ApplicationFiled: May 17, 2021Publication date: December 23, 2021Applicant: Fujitsu LimitedInventors: Yangyang FAN, Jingnan LI, Zhenning TAO
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Patent number: 11108464Abstract: Embodiments of this disclosure provide an apparatus and method for determining coefficients of a fixed equalizer, the fixed equalizer being applicable to performing fixed equalization on an optical communications system, the apparatus including: a first acquiring unit configured to determine coefficients of an adaptive equalizer according to an output signal of the optical communications system; a first transforming unit configured to perform Fourier transform on at least a part of the coefficients of the adaptive equalizer to obtain frequency responses of the at least a part of the coefficients; and a first calculating unit configured to calculate coefficients of the fixed equalizer according to the frequency responses of the at least a part of the coefficients of the adaptive equalizer.Type: GrantFiled: September 24, 2020Date of Patent: August 31, 2021Assignee: FUJITSU LIMITEDInventors: Yangyang Fan, Zhenning Tao
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Patent number: 11070287Abstract: Embodiments of this disclosure provide a method and apparatus for establishing a transmission impairment decomposition model for a Raman amplified system and a system. The method includes: converting a Jones vector of a test signal after passing through a Raman amplified system into a Stokes vector; calculating transmission impairments to which the test signal is subjected by using the Stokes vector according to a pre-established transmission impairment decomposition model; and substituting values of the transmission impairments into the pre-established transmission impairment decomposition model to obtain a complete transmission impairment decomposition model used for estimating transmission impairments.Type: GrantFiled: September 11, 2020Date of Patent: July 20, 2021Assignee: FUJITSU LIMITEDInventors: Jingnan Li, Zhenning Tao, Yangyang Fan
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Patent number: 11057106Abstract: Embodiments of this disclosure provide a method and apparatus for monitoring a modulation depth of a dither signal and an optical transmitter.Type: GrantFiled: September 18, 2020Date of Patent: July 6, 2021Assignee: FUJITSU LIMITEDInventors: Jingnan Li, Yangyang Fan, Zhenning Tao
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Publication number: 20210126710Abstract: Embodiments of this disclosure provide an apparatus and method for determining coefficients of a fixed equalizer, the fixed equalizer being applicable to performing fixed equalization on an optical communications system, the apparatus including: a first acquiring unit configured to determine coefficients of an adaptive equalizer according to an output signal of the optical communications system; a first transforming unit configured to perform Fourier transform on at least a part of the coefficients of the adaptive equalizer to obtain frequency responses of the at least a part of the coefficients; and a first calculating unit configured to calculate coefficients of the fixed equalizer according to the frequency responses of the at least a part of the coefficients of the adaptive equalizer.Type: ApplicationFiled: September 24, 2020Publication date: April 29, 2021Applicant: Fujitsu LimitedInventors: Yangyang FAN, Zhenning TAO
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Publication number: 20210119699Abstract: Embodiments of this disclosure provide a method and apparatus for monitoring a modulation depth of a dither signal and an optical transmitter.Type: ApplicationFiled: September 18, 2020Publication date: April 22, 2021Applicant: Fujitsu LimitedInventors: Jingnan LI, Yangyang FAN, Zhenning TAO
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Publication number: 20210111789Abstract: Embodiments of this disclosure provide a method and apparatus for establishing a transmission impairment decomposition model for a Raman amplified system and a system. The method includes: converting a Jones vector of a test signal after passing through a Raman amplified system into a Stokes vector; calculating transmission impairments to which the test signal is subjected by using the Stokes vector according to a pre-established transmission impairment decomposition model; and substituting values of the transmission impairments into the pre-established transmission impairment decomposition model to obtain a complete transmission impairment decomposition model used for estimating transmission impairments.Type: ApplicationFiled: September 11, 2020Publication date: April 15, 2021Applicant: Fujitsu LimitedInventors: Jingnan LI, Zhenning TAO, Yangyang FAN
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Patent number: 10917171Abstract: A method and apparatus of fiber nonlinear noise monitoring and an optical receiver is provided. The method includes: acquiring a training set including at least two received signal samples obtained after a transmitting signal passes different simulation transmission scenarios, calculating amplitude noise feature values after a digital signal processing, calculating statistics values of fiber nonlinear noises, marking the amplitude noise feature values; taking the amplitude noise feature values as input of a noise monitoring model, taking marks to which the amplitude noise feature values correspond as target output, and training the noise monitoring model according to samples in the training set, so as to obtain a trained noise monitoring model, and inputting a plurality of amplitude noise feature values of received signals to be monitored into the trained noise monitoring model, so as to obtain statistics values of fiber nonlinear noises to which the received signals to be monitored correspond.Type: GrantFiled: September 20, 2019Date of Patent: February 9, 2021Assignee: FUJITSU LIMITEDInventors: Ke Zhang, Zhenning Tao, Yangyang Fan
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Patent number: 10903911Abstract: Embodiments of this disclosure provide an apparatus and method for estimating polarization skew. The method includes: acquiring a plurality of coefficients of an adaptive equalizer of a receiving device; the plurality of coefficients of the adaptive equalizer include at least polarization skew of a transmitting device and polarization skew of the receiving device; and calculating the polarization skew of the transmitting device and the polarization skew of the receiving device according to the plurality of coefficients of the adaptive equalizer.Type: GrantFiled: December 30, 2019Date of Patent: January 26, 2021Assignee: FUJITSU LIMITEDInventors: Yangyang Fan, Zhenning Tao
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Patent number: 10892962Abstract: An inter-channel linear crosstalk estimation method and apparatus and a communication system are disclosed.Type: GrantFiled: September 20, 2018Date of Patent: January 12, 2021Assignee: FUJITSU LIMITEDInventors: Ke Zhang, Xiaofei Su, Yangyang Fan, Zhenning Tao