公开(公告)号：US10862590B1

公开(公告)日：2020-12-08

申请号：US16735585

申请日：2020-01-06

申请人： ZTE Corporation

发明人： Hung-Chang Chien ,  Yi Cai

IPC分类号： H04B10/04 ,  H04B10/58 ,  H04B10/079 ,  H04B10/40 ,  H04Q11/00

摘要： An optical signal transmitter system in an optical communication network includes a digital pre-emphasis device structured to generate a pre-emphasized digital data signal by pre-emphasizing at least a portion of a digital data signal to be transmitted, a digital-to-analog converter coupled to the digital pre-emphasis device to convert the pre-emphasized digital data signal into an analog data signal, an analog pre-emphasis device coupled to the digital-to-analog converter to generate a pre-emphasized analog data signal by pre-emphasizing at least a portion of the analog data signal, an electrical-to-optical converter to convert the pre-emphasized analog signal into an optical signal, and a processor configured to determine a pre-emphasis assignment distribution between the digital pre-emphasis device and the analog pre-emphasis device.

公开(公告)号：US10148363B2

公开(公告)日：2018-12-04

申请号：US15372326

申请日：2016-12-07

申请人： ZTE Corporation

发明人： Hung-Chang Chien ,  Zhensheng Jia ,  Jianjun Yu

IPC分类号： H04B10/00 ,  H04B10/61

摘要： A method of optical communication, implemented at a receiver in an optical communication network, includes receiving an optical signal carrying modulated information bits, processing the optical signal through a receiver subsystem to generate a stream of digitized modulation symbols from the optical signal, and producing, using the digitized modulation symbols as input symbols to an iterative process, estimates of information bits. Each iteration includes: generating estimated output symbols from input symbols by filtering by an estimate of inverse of the optical channel, updating, using the estimated output symbols, the estimate of the inverse of the optical channel to minimize a measure of error, and compensating the estimated output symbols by using pre-distortion values from a look-up table (LUT) to generate compensated output symbols that are used as input to a next iteration.

公开(公告)号：US20170317760A1

公开(公告)日：2017-11-02

申请号：US15499799

申请日：2017-04-27

申请人： ZTE Corporation

发明人： Jianjun Yu ,  Xinying Li ,  Hung-Chang Chien

IPC分类号： H04B10/516 ,  H04L27/36

CPC分类号： H04B10/5161 ,  H04B10/5165 ,  H04L27/206 ,  H04L27/2096 ,  H04L27/364

摘要： A scheme for generating asymmetric single sideband photonic vector signal at millimeter wave spectral region is described. At a transmitter, information bits to be transmitted are modulated using a vector modulation technique to generate a baseband signal. The baseband signal is converted into its single sideband (SSB) version using a complex frequency source having a first frequency. The real part of the upconverted signal is added to the real part of a second frequency source and is input as I component to an I/Q modulator. The imaginary part of the upconverted signal is added to the imaginary part of the second frequency source and is used as the Q component. The I/Q modulator is driven by a laser source at frequency fc. The resulting signal is transmitter over an optical transmission medium and upconverted by a single-ended photodiode to a desired radio-frequency (RF) carrier frequency.

公开(公告)号：US20160248540A1

公开(公告)日：2016-08-25

申请号：US15043351

申请日：2016-02-12

申请人： ZTE Corporation

发明人： Jianjun Yu ,  Fan Li ,  Junwen Zhang ,  Xiao Xin ,  Hung-Chang Chien

IPC分类号： H04J14/06 ,  H04J14/02 ,  H04J11/00 ,  H04B10/556

CPC分类号： H04J11/00 ,  H04B10/5167 ,  H04B10/548 ,  H04L27/2636 ,  H04L27/2649

摘要： Duo-binary encoding is used for encoding I and Q data prior to performing orthogonal frequency division multiplexing based transmission using discrete Fourier transform spreading (DFT-S). Advantageously, duo-binary encoding improves robustness of the encoded signal to inter symbol interference, making the degradation caused by the subsequent DFT-S stage less susceptible to reduction in bit error rate performance.

摘要翻译： 在使用离散傅里叶变换扩展（DFT-S）进行基于正交频分复用的传输之前，使用二进制编码来对I和Q数据进行编码。 有利地，二进制编码改进了编码信号对符号间干扰的鲁棒性，使由后续DFT-S级引起的劣化不太可能降低误码率性能。

公开(公告)号：US20160112122A1

公开(公告)日：2016-04-21

申请号：US14883563

申请日：2015-10-14

申请人： ZTE Corporation

发明人： Hung-Chang Chien ,  Zhensheng Jia ,  Jianjun Yu

IPC分类号： H04B10/079

CPC分类号： H04B10/073

摘要： Optical signal to noise ratio within a band of interest (in-band OSNR) is calculated by using a reference signal for noise estimation. In-band noise at a node along the optical communication path is estimated by subtracting the reference signal contribution from the received in-band signal energy. Contribution from the reference signal is calculated using an effective transfer function of the optical communication path using either a direct method in which measurements are made a priori on an equivalent optical system or an indirect method in which the effective transfer function is calculated using computerized simulations. The selection of which method to use may be based on the desired resolution bandwidth for the estimation of transfer function.

摘要翻译： 通过使用用于噪声估计的参考信号来计算感兴趣频带内的光信噪比（带内OSNR）。 沿着光通信路径的节点处的带内噪声通过从接收到的带内信号能量中减去参考信号贡献来估计。 使用光通信路径的有效传递函数，使用在等效光学系统上先验地进行测量的直接方法或使用计算机化仿真计算有效传递函数的间接方法来计算参考信号的贡献。 选择使用哪种方法可以基于用于估计传递函数的期望的分辨率带宽。

公开(公告)号：US10256934B2

公开(公告)日：2019-04-09

申请号：US15729650

申请日：2017-10-10

申请人： ZTE Corporation

发明人： Jianjun Yu ,  Hung-Chang Chien

IPC分类号： H04B10/00 ,  H04J14/02 ,  H04B10/58 ,  H04B10/50 ,  H04B10/67

摘要： A technique for optical signal transmission includes generating a plurality of double sideband modulated optical signals by modulating a plurality of source data signals using a plurality of direct modulation laser (DML) optical sources, wherein the plurality of double sideband modulated optical signals occupy non-overlapping neighboring optical frequency bands, generating a chirp-managed laser (CML) output signal by multiplexing the plurality of double sideband modulated optical signals using a wavelength-selective multiplexer, and transmitting the CML output signal over an optical transport medium.

公开(公告)号：US20150270921A1

公开(公告)日：2015-09-24

申请号：US14661850

申请日：2015-03-18

申请人： ZTE Corporation

发明人： Zhensheng Jia ,  Hung-Chang Chien ,  Jianjun Yu

IPC分类号： H04J14/06 ,  H04L1/00 ,  H04B10/61

CPC分类号： H04J14/06 ,  H04B10/612 ,  H04B10/613 ,  H04B10/6165 ,  H04B10/6166 ,  H04L1/0036 ,  H04L1/0054

摘要： A blind equalization technique of high-order QAM signals is provided. A method implemented at a receiver-side in an optical communication network receives an optical signal and performs a two-step polarization tracking process on the received optical signal. Using another method, a polarization multiplexed optical transmission is received by a receiver and a polarization tracking process is performed by applying two different algorithms in parallel. One algorithm may be a decision directed least means square (DD-LMS) algorithm. Another algorithm may be a constant modulus algorithm (CMA).

摘要翻译： 提供了高阶QAM信号的盲均衡技术。 在光通信网络中的接收机侧实现的方法接收光信号，并对所接收的光信号执行两步偏振跟踪处理。 使用另一种方法，由接收机接收偏振复用光传输，并且通过并行应用两种不同的算法来执行偏振跟踪处理。 一种算法可以是决策导向的最小均方（DD-LMS）算法。 另一种算法可以是恒模算法（CMA）。

公开(公告)号：US20150117866A1

公开(公告)日：2015-04-30

申请号：US14527371

申请日：2014-10-29

申请人： ZTE Corporation

发明人： Hung-Chang Chien ,  Zhensheng Jia ,  Jianjun Yu

IPC分类号： H04L27/34 ,  H04B10/61 ,  H04B10/516 ,  H04L27/38 ,  H04L27/36

CPC分类号： H04L27/3483 ,  H04B10/541 ,  H04B10/69 ,  H04L27/38 ,  H04L27/389

摘要： Modulation and demodulation of digital signals comprising symbols representing four or more bits uses a constellation map in which initial two bits of the modulated data identify a quadrant of the constellation map and the remaining bits of the modulated data identify a symbol within the quadrant corresponding to the four or more data bits. In some systems, the constellation map is made up from each successive two bits of the input data bits successively identifying a quadrant within a quadrant until a group of bits is uniquely mapped to a single symbol.

摘要翻译： 包含代表四个或更多位的符号的数字信号的调制和解调使用星座图，其中调制数据的初始两位识别星座图的象限，并且调制数据的剩余位标识符号内的符号 四个或更多数据位。 在一些系统中，星座图由连续地识别象限内的象限的输入数据位的每个连续两位构成，直到一组位被唯一地映射到单个符号。

公开(公告)号：US20140233949A1

公开(公告)日：2014-08-21

申请号：US14066620

申请日：2013-10-29

申请人： ZTE Corporation

发明人： Hung-Chang Chien ,  Jianjun Yu ,  Ze Dong

IPC分类号： H04B10/61

CPC分类号： H04B10/6166 ,  H04B10/532 ,  H04B10/61

摘要： An optical transmitter transmits a dual polarization optical Nyquist frequency domain multiplexed signal. The signal includes a first polarization component and a second polarization component. Each component comprises multiple subchannels, possibly having different subchannel bandwidths and different modulation schemes. An optical receiver receives the signal and recovers transmitted data.

摘要翻译： 光发射机发射双极化奈奎斯特频域多路复用信号。 信号包括第一偏振分量和第二偏振分量。 每个组件包括多个子信道，可能具有不同的子信道带宽和不同的调制方案。 光接收器接收信号并恢复发送的数据。

公开(公告)号：US10567211B2

公开(公告)日：2020-02-18

申请号：US15814347

申请日：2017-11-15

申请人： ZTE Corporation

发明人： Jianjun Yu ,  Hung-Chang Chien

IPC分类号： H04L27/36 ,  H04B10/61 ,  H04B10/079 ,  H04B10/524 ,  H04L5/00

摘要： An optical transmitter apparatus is disclosed. The apparatus includes a processor, a memory coupled to the processor, and one or more programs configured to be executed by the processor. The programs include instructions for nonlinearity estimation that characterizes nonlinearity in an optical communication and estimates an amount of symbol distortion caused by the nonlinearity, instructions for selecting and mapping symbols to provide, for the nonlinearity estimation, only symbols that meet predetermined nonlinearity criteria, and instructions for storing, in the memory, the amount of symbol distortion to be used for a nonlinearity pre-compensation.