公开(公告)号：US10382138B2

公开(公告)日：2019-08-13

申请号：US15912852

申请日：2018-03-06

Applicant: NEC Laboratories America, Inc.

Inventor： Shaoliang Zhang ,  Fatih Yaman ,  Eduardo Mateo Rodriguez ,  Yoshihisa Inada

IPC: H04L1/00 ,  H03M13/11 ,  H03M13/25 ,  H04B10/27 ,  H04B10/58 ,  H04L27/34 ,  H04L27/36 ,  H04B10/2543 ,  H04B10/54 ,  H04B10/516

Abstract: Aspects of the present disclosure describe methods of generating an optimized set of constellation symbols for an optical transmission network wherein the optimized constellation is based on GMI cost and considers both fiber nonlinearity and linear transmission noise.

公开(公告)号：US20190109736A1

公开(公告)日：2019-04-11

申请号：US16153051

申请日：2018-10-05

Applicant: NEC Laboratories America, Inc. ,  NEC Corporation

Inventor： Fatih Yaman ,  Shaoliang Zhang ,  Eduardo Mateo Rodriguez ,  Yoshihisa Inada ,  Yue-Kai Huang ,  Weiyang Mo

IPC: H04L25/03 ,  H04B10/079 ,  G06N3/08

Abstract: Systems and methods for transmission filtering are provided. A receiver includes an input coupled to a transmission line to receive distorted optical symbols. A distortion filter is coupled to the input to replace the distorted optical symbols with predicted symbols using a trained neural network. A decoder is coupled to the distortion filter to decode the predicted symbols.

公开(公告)号：US20180102851A1

公开(公告)日：2018-04-12

申请号：US15729021

申请日：2017-10-10

Applicant: NEC Laboratories America, Inc. ,  NEC Corporation

Inventor： Shaoliang Zhang ,  Fatih Yaman ,  Eduardo Mateo Rodriquez ,  Yoshihisa Inada

IPC: H04B10/516 ,  H04B10/079 ,  H04Q11/00

CPC classification number: H04B10/5161 ,  H04B10/07953 ,  H04B10/532 ,  H04B10/541 ,  H04Q11/0066 ,  H04Q2011/0049 ,  H04Q2011/0083

Abstract: Systems and methods for data transport in an optical communications system, including generating a pairwise optimized (PO) multi-dimensional signal constellation in a single stage. The PO multi-dimensional signal constellation is generated by selecting a pair of symbols from a received constellation with M symbols, defining and minimizing an objective function with one or more constraints to optimize the selected pair of symbols, and iteratively selecting and optimizing one or more different pairs of symbols from the received constellation until a threshold condition is reached. Neighbor symbols from the generated PO multi-dimensional signal constellation in each polarization are clustered to formulate a clustered PO multi-dimensional signal constellation, and data is modulated and transmitted in accordance with the clustered PO multi-dimensional signal constellation.

公开(公告)号：US09722700B2

公开(公告)日：2017-08-01

申请号：US14807446

申请日：2015-07-23

Applicant: NEC Laboratories America, Inc. ,  NEC Corporation

Inventor： Fatih Yaman ,  Shaoliang Zhang ,  Ting Wang ,  Yoshihisa Inada ,  Takaaki Ogata

IPC: H04B17/00 ,  H04B10/079 ,  H04J14/02

CPC classification number: H04B10/07957 ,  H04B10/07955 ,  H04J14/0221

Abstract: A wavelength division multiplexing system and method featuring a wavelength monitor that is configured to receive a portion of a combined signal of wavelength division multiplexing channels and determine the wavelengths of each channel or the guardband between each channel in the combined signal. The wavelength monitor determines if there is excess laser drift for each channel in the combined signal. If excess laser drift is determined, feedback is sent to the transmitter for the signal with excess laser drift and the signal is adjusted to produce a target wavelength. The wavelength monitor may utilize optical intradyning in order to monitor the wavelengths of each channel in the combined signal.

公开(公告)号：US09337923B2

公开(公告)日：2016-05-10

申请号：US13654960

申请日：2012-10-18

Applicant: NEC Laboratories America, Inc. ,  NEC Corporation

Inventor： Lei Xu ,  Shaoliang Zhang ,  Fatih Yaman ,  Ting Wang ,  Yoshihisa Inada ,  Takaaki Ogata ,  Yasuhiro Aoki

IPC: H04B10/12 ,  H04B10/00 ,  H04B10/04 ,  H04B10/079 ,  H04B10/2507 ,  H04B10/07 ,  H04B10/2543

CPC classification number: H04B10/07957 ,  H04B10/07 ,  H04B10/07953 ,  H04B10/2507 ,  H04B10/25073 ,  H04B10/2543 ,  H04B2210/254

Abstract: A method includes evaluating an optical signal spectrum for estimated filtering parameters of an optical spectral filtering device for shaping optical signal spectrum, determining a feedback for fine tuning the optical spectral filtering device for nonlinearity tolerance enhancement in the optical transmission system, responsive to received optical signal quality in the optical signal spectrum; and using the feedback to adjust said optical spectral filtering device for predetermined shaping and predetermined fiber nonlinearity tolerance in the optical transmission system.

Abstract translation: 一种方法包括评估用于光谱滤波装置的估计滤波参数的光信号频谱，用于整形光信号频谱，确定用于微光调整光谱滤波装置的反馈以对光传输系统中的非线性容限增强响应于接收到的光信号 光信号光谱质量; 并且使用所述反馈来调整所述光谱滤波装置以用于所述光传输系统中的预定成形和预定的光纤非线性公差。

公开(公告)号：US20160028536A1

公开(公告)日：2016-01-28

申请号：US14808062

申请日：2015-07-24

Applicant: NEC Laboratories America, Inc.

Inventor： Shaoliang Zhang ,  Fatih Yaman ,  Yoshihisa Inada

IPC: H04L7/00 ,  H04L1/20

CPC classification number: H04L1/205 ,  H04L1/206 ,  H04L27/00 ,  H04L27/0014 ,  H04L27/2656 ,  H04L27/3827

Abstract: A system for carrier phase recovery, including a receiver for receiving one or more frames of L symbols. A phase estimator performs carrier phase estimation for the received frames of L symbols, and the resulting carrier phase estimates are stored in a non-transitory computer-readable storage medium. One or more rotators de-rotates the received frames of L symbols by one or more of the carrier phase estimates, and a data processor calculates a sum of the outputs of the L de-rotated signals raised to an nth power, and determines a real part of the sum. A minimum determination device determines a minimum of the real part of the sum with respect to the carrier phase estimates, and phase unwrapping and multiplier removal is performed if a minimum has been determined.

Abstract translation: 一种用于载波相位恢复的系统，包括用于接收一个或多个L个符号帧的接收机。 相位估计器对接收的L个符号的帧执行载波相位估计，并且所得到的载波相位估计被存储在非暂时的计算机可读存储介质中。 一个或多个旋转器通过载波相位估计中的一个或多个使L个符号的接收帧去旋转，并且数据处理器计算升高到第n个功率的L个去旋转信号的输出的和，并且确定真实的 总和的一部分。 最小确定装置确定相对于载波相位估计的总和的实部的最小值，并且如果已经确定了最小值，则执行相位展开和乘法器去除。

公开(公告)号：US20160028504A1

公开(公告)日：2016-01-28

申请号：US14807446

申请日：2015-07-23

Applicant: NEC Laboratories America, Inc. ,  NEC Corporation

Inventor： Fatih Yaman ,  Shaoliang Zhang ,  Ting Wang ,  Yoshihisa Inada ,  Takaaki Ogata

IPC: H04J14/02 ,  H04B10/079

CPC classification number: H04B10/07957 ,  H04B10/07955 ,  H04J14/0221

Abstract: A wavelength division multiplexing system and method featuring a wavelength monitor that is configured to receive a portion of a combined signal of wavelength division multiplexing channels and determine the wavelengths of each channel or the guardband between each channel in the combined signal. The wavelength monitor determines if there is excess laser drift for each channel in the combined signal. If excess laser drift is determined, feedback is sent to the transmitter for the signal with excess laser drift and the signal is adjusted to produce a target wavelength. The wavelength monitor may utilize optical intradyning in order to monitor the wavelengths of each channel in the combined signal.

Abstract translation: 一种波分复用系统和方法，其特征在于波长监视器被配置为接收波分复用信道的组合信号的一部分，并确定组合信号中每个信道之间的每个信道或保护带的波长。 波长监测器确定组合信号中每个通道是否存在过多的激光漂移。 如果确定了多余的激光漂移，则将反馈发送到具有过多激光漂移的信号的发射机，并且调整信号以产生目标波长。 波长监视器可以利用光学缓冲来监视组合信号中每个通道的波长。

公开(公告)号：US20150026541A1

公开(公告)日：2015-01-22

申请号：US14336074

申请日：2014-07-21

Applicant: NEC Laboratories America, Inc. ,  NEC Corporation

Inventor： Shaoliang Zhang ,  Fatih Yaman ,  Yoshihisa Inada ,  Takaaki Ogata ,  Takanori Inoue

IPC: H03M13/11 ,  H03M13/00 ,  H04L1/00

CPC classification number: H03M13/1111 ,  H03M13/256 ,  H03M13/2957 ,  H03M13/4138 ,  H04L1/005 ,  H04L1/0057 ,  H04L1/006 ,  H04L1/0064 ,  H04L1/0076

Abstract: At a receiver side, to enhance the performance of concatenated LDPC and TCM coding, an iterative decoding between TCM decoder and LDPC decoder enables improvement in the reliability of received LLRs of each symbol after each iteration. A SOVA output of the TCM is used for LDPC decoding, and then the updated LLRs from LDPC decoder are further looped back to the TCM decoder for the next iteration. In such a manner, the decoding performance could be significantly improved after just several iterations.

Abstract translation: 在接收机侧，为了提高级联LDPC和TCM编码的性能，TCM解码器和LDPC解码器之间的迭代解码器能够在每次迭代后提高每个符号的接收LLR的可靠性。 TCM的SOVA输出用于LDPC解码，然后来自LDPC解码器的更新的LLR进一步循环回TCM解码器进行下一次迭代。 以这种方式，在几次迭代之后，解码性能可以显着提高。