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公开(公告)号：US11967996B2
公开(公告)日：2024-04-23
申请号：US17843335
申请日：2022-06-17
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
Inventor： Jilong Han , Liangchuan Li
CPC classification number: H04B10/6971 , H04L25/03159
Abstract: Embodiments of the present disclosure provide example frequency domain equalization methods, example equalizers, example optical receivers, and example systems. One example method includes obtaining, by an optical receiver, a first complex signal. The first complex signal is a first time domain signal. The first complex signal is obtained based on two channels of mutually independent digital electrical signals. The optical receiver converts the first complex signal into a frequency domain signal, and multiplies the first complex signal in frequency domain by a tap coefficient to obtain a second complex signal. The tap coefficient is used to implement signal compensation for the first complex signal in frequency domain. The optical receiver converts the second complex signal into a second time domain signal, divides the second time domain signal into two channels of real signals, and outputs the two channels of the real signals.
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公开(公告)号：US20230344519A1
公开(公告)日：2023-10-26
申请号：US18343710
申请日：2023-06-28
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
Inventor： Tao Gui , Yanzhao Lu , Liangchuan Li
CPC classification number: H04B10/40 , H04B10/615 , H04B10/25
Abstract: An optical module includes a processing component and a plug component. The plug component includes a plurality of filters. The plurality of filters are connected to a plurality of secondary ports. The processing component includes a plurality of primary ports. The optical module is in a first connection status or a second connection status. When the optical module is respectively in the first connection status or the second connection status, a wavelength of a second service optical signal or a wavelength of a second local oscillator optical signal that are sent by the plurality of filters varies. When the optical module is in a same connection status, wavelengths of the second service optical signal and the second local oscillator optical signal that are sent by the plurality of filters are identical.
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公开(公告)号：US11342940B2
公开(公告)日：2022-05-24
申请号：US17009920
申请日：2020-09-02
Applicant: Huawei Technologies Co., Ltd.
Inventor： Zhiyu Xiao , Ling Liu , Liangchuan Li
Abstract: A data processing method includes performing first equalization processing on a data stream that comprises a plurality of sub-data stream segments, performing segment de-interleaving on the data stream, separately performing first forward error correction (FEC) decoding on each sub-data stream segment in a data stream, performing, according to an equalization termination state of each sub-data stream segment, second equalization processing on each sub-data stream segment, performing second FEC decoding on the data stream, and outputting the data stream obtained according to the second FEC decoding in response to a preset iteration termination condition being met, or performing, in response to the preset iteration termination condition not being met, according to the equalization termination state of each sub-data stream segment obtained according to the first equalization, the second equalization processing on each sub-data stream segment obtained according to the second FEC decoding.
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公开(公告)号：US10193713B2
公开(公告)日：2019-01-29
申请号：US15270286
申请日：2016-09-20
Applicant: Huawei Technologies Co., Ltd.
Inventor： Liangchuan Li , Ling Liu
Abstract: A method for sending and receiving a signal is disclosed, and a corresponding device and system. The method includes performing constellation mapping on a data stream to obtain a mapped signal, and performing pre-filtering on the mapped signal to convert the mapped signal into a narrowband signal filtered signal. The pre-filtering is finite impulse response filtering. A bandwidth of the narrowband signal filtered signal is less than bandwidth of the mapped signal, and the narrowband signal filtered signal is a baud rate signal. The method also includes performing waveform forming according to the narrowband signal filtered signal to obtain a shaped signal, and performing digital-to-analog conversion on the shaped signal to convert a shaped second signal into an analog signal, and sending the analog signal.
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公开(公告)号：US20250158717A1
公开(公告)日：2025-05-15
申请号：US19026094
申请日：2025-01-16
Applicant: Huawei Technologies Co., Ltd.
Inventor： Qiguang Feng , Liangchuan Li , Tianhai Chang
Abstract: This application discloses a transmission method, which includes: An optical transmitting device generates a first transmission frame, where the first transmission frame includes a first sequence and a second sequence, the first sequence corresponds to a first single-frequency signal and a second single-frequency signal in frequency domain, a frequency of the first single-frequency signal is fixed in a first time period, a frequency of the second single-frequency signal is fixed in the first time period, and the first time period is at least a part of a time period in which the optical transmitting device sends the first sequence; and a difference between signal amplitudes of a frequency-domain signal corresponding to the second sequence in frequency domain at any two frequencies in first bandwidth is less than a first threshold.
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Patent Agency Ranking
公开(公告)号：US11817908B2
公开(公告)日：2023-11-14
申请号：US17853067
申请日：2022-06-29
Applicant: Huawei Technologies Co., Ltd.
Inventor： Tao Gui , Liangchuan Li
IPC: H04B10/00 , H04B10/61 , H04B10/2575 , H04J14/00
CPC classification number: H04B10/614 , H04B10/25759 , H04B10/6151
Abstract: A coherent optical receiving apparatus including a polarization optical splitter, a polarization controller, an optical hybrid unit, and a combiner. The polarization optical splitter is connected to an input terminal of the optical hybrid unit, and an output terminal of the optical hybrid unit is connected to the combine. The polarization optical splitter receives signal light and local oscillator light in any polarization mode, decomposes the signal light into a plurality of beams of sub signal light, and decomposes the local oscillator light into a plurality of beams of sub local oscillator light. The optical hybrid unit obtains a plurality of beams of hybrid light by performing optical hybridization on the sub signal and sub local oscillator lights, the combiner performs conversion on the plurality of beams of hybrid light to obtain and output coherent electrical signals, and the polarization controller controls polarization of the local oscillator light.
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公开(公告)号：US10993004B2
公开(公告)日：2021-04-27
申请号：US16986888
申请日：2020-08-06
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
Inventor： Yanzhao Lu , Xie Wang , Liangchuan Li , Shupeng Deng
Abstract: A first optical splitter splits a light source to obtain a first optical signal, a second optical signal, and a third optical signal. A first MZ modulator modulates the first optical signal to output a fourth optical signal. A second MZ modulator modulates the second optical signal to output a fifth optical signal. A first optical coupler couples the fourth optical signal and the fifth optical signal to output a sixth optical signal and a seventh optical signal. A power regulator and a phase shifter respectively perform power adjustment and phase shifting on the third optical signal to output an eighth optical signal. A second optical splitter splits the eighth optical signal into a ninth optical signal and a tenth optical signal. A second optical coupler combines the sixth optical signal and the ninth optical signal. A third optical coupler combines the seventh optical signal and the tenth optical signal.
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公开(公告)号：US10911093B2
公开(公告)日：2021-02-02
申请号：US16564022
申请日：2019-09-09
Applicant: HUAWEI TECHNOLOGIES CO., LTD.
Inventor： Yi Yu , Yuanda Huang , Liangchuan Li
Abstract: Embodiments described and shown provide a signal transmission method, a signal receiving method, a related device, and a system. The signal transmission method includes: generating a single-wavelength optical carrier; splitting the single-wavelength optical carrier into N subcarriers having a same wavelength; generating a spreading code corresponding to each of the subcarriers to obtain N spreading codes, where a bandwidth of each of the spreading codes is less than or equal to a preset threshold; deserializing a to-be-transmitted data signal into N sub-data signals; modulating the N subcarriers based on the N sub-data signals and the N spreading codes, to obtain N modulation signals; and combining the N modulation signals into one combined signal, and outputting the combined signal.
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公开(公告)号：US09521022B2
公开(公告)日：2016-12-13
申请号：US14995855
申请日：2016-01-14
Applicant: Huawei Technologies Co., Ltd.
Inventor： Ling Liu , Liangchuan Li
CPC classification number: H04L27/0014 , H04B10/6165 , H04L27/3827 , H04L2027/0046 , H04L2027/0067 , H04L2027/0095
Abstract: The present invention provides a cycle-slip detection method and apparatus, and a receiver. If an absolute value of a first difference obtained by subtracting a phase of a first symbol in a kth training sequence cycle from a phase of a last symbol in a (k−1)th training sequence cycle in a received signal is greater than a cycle-slip determining threshold, it is determined that a cycle-slip occurs in the kth or (k−1)th training sequence cycle. Further, if a second difference obtained by subtracting a phase of the first symbol in the (k+1)th training sequence cycle from a phase of the last symbol in the kth training sequence cycle is greater than the cycle-slip determining threshold, and signs of the first difference and the second difference are opposite, it is determined that a cycle-slip occurs in all symbols in the kth training cycle.
Abstract translation: 本发明提供一种循环滑移检测方法和装置以及接收器。 如果通过从接收信号中的第（k-1）训练序列周期中的最后一个符号的相位减去第k个训练序列周期中的第一符号的相位获得的第一差的绝对值大于循环 确定在第k或第（k-1）训练序列周期中发生周期滑移。 此外，如果通过从第k个训练序列周期中的最后一个符号的相位减去第（k + 1）个训练序列周期中的第一符号的相位获得的第二差异大于循环滑移确定阈值， 第一差异和第二差异的符号相反，确定在第k个训练周期中的所有符号中出现周期滑移。
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公开(公告)号：US08995831B2
公开(公告)日：2015-03-31
申请号：US13664134
申请日：2012-10-30
Applicant: Huawei Technologies Co., Ltd.
Inventor： Liangchuan Li , Ling Liu
CPC classification number: H04B10/2572
Abstract: A method for processing optical signals includes performing frequency mixing, photoelectric detection, analog/digital conversion, and dispersion compensation on received input optical signals. First-path polarization multiplexing optical signals and second-path polarization multiplexing optical signals. An initialization update process is performed on filter coefficients. Polarization compensation is performed on the first-path polarization multiplexing optical signals and the second-path polarization multiplexing optical signals by using the filter coefficients on which the initialization update is performed to obtain initialized x-path optical signals and initialized y-path optical signals. Preset x-path training sequences and y-path training sequences are synchronized by using the initialized x-path optical signals and the initialized y-path optical signals. If a synchronization result indicates that polarization cross occurs, the polarization cross is rectified.
Abstract translation: 一种处理光信号的方法包括对接收到的输入光信号执行频率混合，光电检测，模/数转换和色散补偿。 第一路径偏振复用光信号和第二路径偏振复用光信号。 对滤波器系数执行初始化更新处理。 通过使用执行初始化更新的滤波器系数来获得初始化的x路光信号和初始化的y路光信号，对第一路径偏振多路复用光信号和第二路径偏振复用光信号进行极化补偿。 通过使用初始化的x路径光信号和初始化的y路径光信号来同步预置x路径训练序列和y路径训练序列。 如果同步结果表明发生极化交叉，则会纠正极化交叉。
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