公开(公告)号：US20170331551A1

公开(公告)日：2017-11-16

申请号：US15151895

申请日：2016-05-11

申请人： Zhiping JIANG ,  Zhuhong ZHANG ,  Chuandong LI

发明人： Zhiping JIANG ,  Zhuhong ZHANG ,  Chuandong LI

IPC分类号： H04B10/11 ,  H04J14/02 ,  H04B10/556 ,  H04L5/00 ,  H04B1/00

CPC分类号： H04B10/11 ,  H04B1/0007 ,  H04B10/50 ,  H04B10/5563 ,  H04B2210/075 ,  H04J14/02 ,  H04J14/0276 ,  H04L5/0048 ,  H04L25/0226

摘要： 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.

公开(公告)号：US20180183518A1

公开(公告)日：2018-06-28

申请号：US15895374

申请日：2018-02-13

申请人： Zhiping JIANG ,  Zhuhong ZHANG ,  Chuandong LI

发明人： Zhiping JIANG ,  Zhuhong ZHANG ,  Chuandong LI

IPC分类号： H04B10/11 ,  H04B10/556 ,  H04J14/02 ,  H04L5/00 ,  H04B1/00

CPC分类号： H04B10/11 ,  H04B1/0007 ,  H04B10/50 ,  H04B10/5563 ,  H04B2210/075 ,  H04J14/02 ,  H04J14/0276 ,  H04L5/0048 ,  H04L25/0226

摘要： 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.

公开(公告)号：US20160211938A1

公开(公告)日：2016-07-21

申请号：US14598581

申请日：2015-01-16

申请人： Zhiping JIANG ,  Zhuhong ZHANG ,  Xuefeng TANG

发明人： Zhiping JIANG ,  Zhuhong ZHANG ,  Xuefeng TANG

IPC分类号： H04J14/02 ,  H04B10/077

CPC分类号： H04J14/0276 ,  H04B10/077 ,  H04B10/0775 ,  H04B10/2504 ,  H04B10/516 ,  H04B2210/075 ,  H04J14/06

摘要： The present applies to digital wavelength converters that convert, independently of the format in which optical data may be encoded, an input waveform at a first wavelength to an output waveform at a second wavelength. When operating in an environment where an input waveform has a pilot tone associated thereto, the method and system of the present disclosure allows for the removal of the pilot tone from the input waveform, and also allows for the addition of another pilot to the output waveform.

摘要翻译： 本发明适用于与光学数据可被编码的格式独立地将第一波长的输入波形转换为第二波长的输出波形的数字波长转换器。 当在输入波形具有与其相关联的导频音的环境中操作时，本公开的方法和系统允许从输入波形中去除导频音，并且还允许将另外的导频添加到输出波形 。

公开(公告)号：US20150222468A1

公开(公告)日：2015-08-06

申请号：US14614098

申请日：2015-02-04

申请人： Chuandong LI ,  Chen CHEN ,  Zhuhong ZHANG

发明人： Chuandong LI ,  Chen CHEN ,  Zhuhong ZHANG

IPC分类号： H04L27/26

CPC分类号： H04L27/2628 ,  H04B10/25137 ,  H04L25/03343 ,  H04L27/2634 ,  H04L27/368

摘要： Chromatic dispersion is pre-compensated in a direct-detected orthogonal frequency-division multiplexed optical transmitter through digital signal processing methods, to generate signals that can be transmitted over an optical fiber. The dispersion pre-compensation digital signal processing may include multiplying subcarriers by a respective factor. The dispersion pre-compensation digital signal processing may instead include application of a finite impulse response filter to signals. The dispersion pre-compensation digital signal processing may instead include fast Fourier transformations of signals, application of a frequency domain filter to signals generated by the fast Fourier transformations, and inverse fast Fourier transformations of the signals produced by application of the frequency domain filter.

摘要翻译： 通过数字信号处理方法在直接检测的正交频分复用光发射机中对色散进行预补偿，以产生可以通过光纤传输的信号。 色散预补偿数字信号处理可以包括将副载波乘以相应的因子。 分散预补偿数字信号处理可以替代地包括对信号应用有限脉冲响应滤波器。 色散预补偿数字信号处理可以替代地包括信号的快速傅里叶变换，对由快速傅里叶变换产生的信号应用频域滤波器，以及通过应用频域滤波器产生的信号的快速傅里叶逆变换。

公开(公告)号：US20110081150A1

公开(公告)日：2011-04-07

申请号：US12574852

申请日：2009-10-07

申请人： Chuandong LI ,  Zhuhong ZHANG

发明人： Chuandong LI ,  Zhuhong ZHANG

IPC分类号： H04J14/06

CPC分类号： H04J14/06 ,  H04B10/69 ,  H04L7/0278

摘要： An apparatus comprising a plurality of receivers each configured to receive a plurality of polarized signals, a voltage control oscillator (VCO) coupled to the receivers and configured to control timing and sampling frequency of the polarized signals, and a signal processing component coupled to the receivers and configured to update a plurality of weighted linear factors, wherein the polarized signals and the weighted linear factors are used to obtain a combined signal, and wherein the weighted linear factors are updated using a real part or an imaginary part of the combined signal. Included is a method comprising using a linear factor to combine a plurality of polarized optical signals to provide time recovery information, and updating the linear factor using a combination of the polarized optical signals.

摘要翻译： 一种包括多个接收器的设备，每个接收器被配置为接收多个极化信号;压控振荡器（VCO），其被耦合到所述接收器并被配置为控制所述极化信号的定时和采样频率，以及耦合到所述接收器的信号处理部件 并且被配置为更新多个加权线性因子，其中所述偏振信号和加权线性因子用于获得组合信号，并且其中使用所述组合信号的实部或虚部更新所述加权线性因子。 包括使用线性因子来组合多个偏振光信号以提供时间恢复信息并且使用偏振光信号的组合来更新线性因子的方法。

公开(公告)号：US20220021463A1

公开(公告)日：2022-01-20

申请号：US16929962

申请日：2020-07-15

申请人： Xuefeng TANG ,  Wing Chau NG ,  Zhiping JIANG ,  Zhuhong ZHANG

发明人： Xuefeng TANG ,  Wing Chau NG ,  Zhiping JIANG ,  Zhuhong ZHANG

IPC分类号： H04B10/564 ,  H04B10/548 ,  G02F1/21

摘要： Methods and devices for power imbalance compensation and calibration of a coherent transmitter or transceiver are described. A pilot tone is combined with a digital data signal such that relative amplitudes of the pilot tone in each of four transmitted optical data channels may be detected by a pilot tone detector and used to calculate any power imbalances between I/Q phase channels and/or X/Y polarized channels of the transmitter. The pilot tone detector applies gain to the data signal of the transmitter to compensate for any calculated power imbalances. Because the pilot tone is combined with the digital data signal, its amplitude in each received channel is proportional to the data signal power of that channel.

公开(公告)号：US20230198551A1

公开(公告)日：2023-06-22

申请号：US17559262

申请日：2021-12-22

申请人： Hamid EBRAHIMZAD ,  Zhuhong ZHANG

发明人： Hamid EBRAHIMZAD ,  Zhuhong ZHANG

IPC分类号： H03M13/13

CPC分类号： H03M13/13

摘要： Methods and encoders for encoding information bits to generate codewords for transmission across a communication channel are described. The method includes receiving input data comprising bits of information bits and frozen bits. Each bit has a value. Further, the method identifies at least one special arrangement in a subset of input data depending on locations of the information bits and the frozen bits. This subset of input data is of length L. The subset of input data has at least one special arrangement that enables direct computations instead of a series of computations to determine a preliminary output. The method generates a codeword for the input data from the preliminary output.

公开(公告)号：US20220060262A1

公开(公告)日：2022-02-24

申请号：US17001299

申请日：2020-08-24

申请人： Mrinmoy JANA ,  Jeebak MITRA ,  Lutz Hans-Joachim LAMPE ,  Jin WANG ,  Zhuhong ZHANG

发明人： Mrinmoy JANA ,  Jeebak MITRA ,  Lutz Hans-Joachim LAMPE ,  Jin WANG ,  Zhuhong ZHANG

IPC分类号： H04B10/61 ,  H04L25/03 ,  H04L5/00

摘要： A receiver architecture is described for phase noise compensation in the presence of inter-channel interference (ICI) and inter-symbol interference (ISI), particularly for time-frequency packing (TFP) transmissions. The receiver includes a coarse phase noise (PN) estimator, a PN compensation module, an ICI cancellation module, an ISI compensation module, a FEC decoder, and an iterative PN estimator. The iterative PN estimator receives log likelihood ratio (LLR) information from the decoder and provides an iterative PN estimation to the PN compensation module. The decoder also provides LLR to the ISI compensation module, and to at least one other receiver for another subchannel that is immediately adjacent in frequency. The ICI cancellation module receives decoder output from at least one adjacent subchannel, which the ICI cancellation module uses to provide a ICI-cancelled signal.

公开(公告)号：US20220368512A1

公开(公告)日：2022-11-17

申请号：US17869350

申请日：2022-07-20

申请人： Xuefeng TANG ,  Qiang JIN ,  Wing Chau NG ,  Si OUYANG ,  Zhuhong ZHANG

发明人： Xuefeng TANG ,  Qiang JIN ,  Wing Chau NG ,  Si OUYANG ,  Zhuhong ZHANG

IPC分类号： H04L7/00 ,  H04B10/516

摘要： Methods and devices for IQ time skew and conjugation compensation and calibration of a coherent transmitter or transceiver are described. A pilot tone is combined with a digital data signal such that relative powers of the pilot tone in each of two frequency bands of the transmitted data signal may be detected by a pilot tone detector and used to calculate the time skew between I and Q modulation channels of the transmitter. A transmitter DSP applies IQ time skew bias to the data signal to compensate for any calculated IQ time skew. The pilot tone detector also provides the transmitter DSP with the information necessary to detect phase conjugation of the optical signal, which can be corrected by inverting the polarity of the data signal or changing the phase bias point of the optical modulator.

公开(公告)号：US20220247514A1

公开(公告)日：2022-08-04

申请号：US17163100

申请日：2021-01-29

申请人： Hamid EBRAHIMZAD ,  Zhuhong ZHANG

发明人： Hamid EBRAHIMZAD ,  Zhuhong ZHANG

IPC分类号： H04L1/00

摘要： The disclosed systems, structures, and methods are directed to encoding and decoding information for transmission across a communication channel. The encoding method includes: distributing the information bits between m parallel polar codes such that each of the m parallel polar codes includes a subset of the information bits; splitting the subset of information bits in each of the m parallel polar codes into a protected information section and a full rate information section; protecting information bits in the protected information section of each of the m parallel polar codes; arranging a plurality of frozen bits in each of the m parallel polar codes; and generating a polar encoded codeword for each of the m parallel polar codes.