公开(公告)号：US10374632B2

公开(公告)日：2019-08-06

申请号：US15729110

申请日：2017-10-10

Applicant: NEC Laboratories America, Inc. ,  NEC Corporation

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

IPC: H03M13/11 ,  H03M13/29 ,  H03M13/00 ,  H04L1/00 ,  H04B10/27 ,  H04B10/516 ,  H04B10/61 ,  H03M13/27

Abstract: Systems and methods for data transport in optical communications systems, including a transmitter for encoding a received information sequence by constructing an outer and inner quasi cyclic-low-density parity check (QC-LDPC) code. The encoding includes dividing the received information sequence into a plurality of messages of equal length, encoding each of the messages into a codeword to generate a plurality of outer codewords, cascading the plurality of outer codewords to generate a bit sequence, and executing inner encoding to encode each of the plurality of outer codewords into codewords in QC-LDPC inner code. A receiver decodes a received data stream based on the QC-LDPC inner code using two-phase decoding including iteratively performing at least one of inner/outer and outer/inner decoding until a threshold condition is reached.

公开(公告)号：US20180136016A1

公开(公告)日：2018-05-17

申请号：US15811061

申请日：2017-11-13

Applicant: NEC Laboratories America, Inc.

Inventor： Fatih Yaman ,  Shaoliang Zhang ,  Ezra Ip ,  Yue-Kai Huang ,  Giovanni Milione

IPC: G01D5/353 ,  G01M11/00

CPC classification number: G01D5/35364 ,  G01M11/3118 ,  G01M11/3145 ,  G01M11/3154

Abstract: Methods and systems for Brillouin optical time-domain reflectometry include optically filtering out non-Brillouin signals reflected from a fiber. Brillouin signals reflected from the fiber are coupled with a local oscillator to produce a Brillouin shift signals. The Brillouin shift signals are converted to an electrical domain using a photodetector. The electrical Brillouin shift signals are converted to a digital domain using a low-speed analog-to-digital converter that has a sampling rate below a Nyquist rate sufficient to fully resolve the electrical Brillouin shift signals.

公开(公告)号：US09866928B2

公开(公告)日：2018-01-09

申请号：US14934078

申请日：2015-11-05

Applicant: NEC Laboratories America, Inc.

Inventor： Yue-Kai Huang ,  Shaoliang Zhang ,  Fatih Yaman ,  Ting Wang

IPC: H04B10/61 ,  H04B10/516 ,  H04Q11/00 ,  H04J14/02

CPC classification number: H04Q11/0001 ,  H04B10/516 ,  H04B10/613 ,  H04B10/616 ,  H04B10/6166 ,  H04J14/0298

Abstract: Systems and methods are disclosed for data communication by performing RF sub-band multiplexing and demultiplexing by cascading a radio-frequency (RF) mixing module and optical dual-polarized (DP) QPSK modulator forhybrid RF/optical IQ modulation; and performing intra-transceiver optical superchannel switching through the RF sub-band multiplexing.

公开(公告)号：US20170353247A1

公开(公告)日：2017-12-07

申请号：US15078538

申请日：2016-03-23

Applicant: NEC Laboratories America, Inc.

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

IPC: H04B10/54 ,  H04B10/50 ,  H04B10/69 ,  H04B10/25 ,  H04B10/40 ,  H04B10/61

CPC classification number: H04B10/541 ,  H04B10/25 ,  H04B10/40 ,  H04B10/504 ,  H04B10/516 ,  H04B10/612 ,  H04B10/69

Abstract: Methods and systems for communication with a modified constellation are provided. One of the methods includes coding, by a transmitter in the user equipment, an input data stream into a constellation of symbols having at least two neighboring symbols therein which differ by more than one bit and which are separated by a modified Euclidean distance to increase a Gaussian white noise resiliency of the at least two neighboring symbols with respect to remaining symbols, the remaining symbols being separated by the Euclidean distance of exactly one bit. The method further includes modulating, by the transmitter, the symbol stream into a transmission stream.

公开(公告)号：US09654249B2

公开(公告)日：2017-05-16

申请号：US14846348

申请日：2015-09-04

Applicant: NEC Laboratories America, Inc.

Inventor： Yue-Kai Huang ,  Shaoliang Zhang ,  Fatih Yaman

IPC: H04B10/04 ,  H04J14/06 ,  H04B10/61 ,  H04B10/29

CPC classification number: H04J14/06 ,  H04B10/29 ,  H04B10/61

Abstract: A method of wavelength conversion without polarization tracking is provided. A system is also provided that converts an input signal into an output signal of a different wavelength that contains all of the amplitude, phase, and polarization information of the original signal. The method includes separating, using a polarization-diversity optical mixer, an input optical signal of a first wavelength into a plurality of electrical signals containing amplitudes and phases while maintaining the polarization information of the input signal, converting each of the amplitudes and phases into individual photo-currents using a photo-diode, converting each of the output photo-currents into voltages using an amplifier, modulating the multitude of voltages to a second wavelength using a modulator, where the separated electrical signals are up-converted to generate an output optical signal that maintains the same amplitude, phase, and polarization information as was contained in the input signal.

公开(公告)号：US20160285668A1

公开(公告)日：2016-09-29

申请号：US15079848

申请日：2016-03-24

Applicant: NEC Laboratories America, Inc.

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

IPC: H04L27/36

CPC classification number: H04L27/362 ,  H04L27/34 ,  H04L27/3405 ,  H04L27/3444 ,  H04L27/36

Abstract: Methods and systems for communication with an optimized constellation include coding an input data stream to a symbol stream according to an optimized constellation that has a non-Gray bit mapping and that has neighboring points having more than one bit difference farther apart than neighboring points having one bit difference. The symbol stream is modulated onto a transmission signal and subsequently demodulated at a receiver to produce a received symbol stream. The received symbol stream is decoded to a bitstream according to an optimized constellation that has a non-Gray bit mapping and that has neighboring points having more than one bit difference farther apart than neighboring points having one bit difference.

Abstract translation: 用于与优化星座进行通信的方法和系统包括根据具有非格雷比特映射的优化星座将输入数据流编码为符号流，并且具有比具有一灰色相邻点的相邻点多一个比特差的相邻点 位差。 符号流被调制到传输信号上，随后在接收机处被解调以产生接收到的符号流。 接收到的符号流根据具有非格雷比特映射的优化星座被解码为比特流，并且具有比具有一个比特差的相邻点更远一个以上的比特差的相邻点。

公开(公告)号：US09450715B2

公开(公告)日：2016-09-20

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 ,  H04L27/00

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：US09184854B2

公开(公告)日：2015-11-10

申请号：US14044518

申请日：2013-10-02

Applicant: NEC Laboratories America, Inc.

Inventor： Eduardo F. Mateo ,  Fatih Yaman ,  Dayou Qian ,  Ting Wang

IPC: H04B10/06 ,  H04B10/61

CPC classification number: H04B10/6163

Abstract: An optical communication system includes a digital signal processer coupled to the coherent receiver, said coherent receiver including a nonlinearity compensation module for compensating for nonlinear effects in fiber in the optical link for increasing capacity or transmission distance of the fiber, the nonlinearity compensation module includes a spectral slicing of the signal into bands, computing nonlinear interaction between the bands with parameters opposite to those of the fiber to reverse the non-linear effects in the fiber, and only certain nonlinear interactions between bands are considered thereby reducing complexity of the nonlinearity compensation.

Abstract translation: 光通信系统包括耦合到相干接收机的数字信号处理器，所述相干接收机包括用于补偿光链路中的光纤中的非线性效应的非线性补偿模块，用于增加光纤的容量或传输距离，非线性补偿模块包括 将信号频谱切片成频带，计算具有与光纤相反参数的频带之间的非线性相互作用，以反转光纤中的非线性效应，并且仅考虑频带之间的某些非线性相互作用，从而降低非线性补偿的复杂性。

公开(公告)号：US20150215048A1

公开(公告)日：2015-07-30

申请号：US14607067

申请日：2015-01-27

Applicant: NEC Laboratories America, Inc.

Inventor： Shaoliang Zhang ,  Fatih Yaman ,  Yue-Kai Huang

IPC: H04B10/564 ,  H04B10/54 ,  H04B10/079

CPC classification number: H04B10/50575 ,  H04B10/5561 ,  H04B10/588

Abstract: An automatic bias control tracking for all modulation formats in an optical modulator includes monitoring the average output optical power using a low-speed photodetector to adjust the modulator bias. Two-level DC dithering signals are applied to two DC ports individually in time to isolate the impact of the other port while adjusting the current DC bias, thus improving the accuracy and efficiency. The power monitoring of low-frequency RF power is utilized to find a quad-point, where the in-phase and quadrature are orthogonal with each other. The total output power is used as a rule when adjusting the phase bias.

Abstract translation: 用于光调制器中的所有调制格式的自动偏置控制跟踪包括使用低速光电检测器来监测平均输出光功率以调整调制器偏压。 两级DC抖动信号及时分别应用于两个DC端口，以隔离其他端口的影响，同时调整电流直流偏置，从而提高精度和效率。 利用低频RF功率的功率监控来找到四点，其中同相和正交相互正交。 在调整相位偏置时，总输出功率通常被使用。

公开(公告)号：US09077484B2

公开(公告)日：2015-07-07

申请号：US14046588

申请日：2013-10-04

Applicant: NEC Laboratories America, Inc.

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

IPC: H04B10/04 ,  H04J14/06 ,  H04B10/556

CPC classification number: H04J14/06 ,  H04B10/5561

Abstract: Methods, structures and systems for generating different polarization multiplexed signals wherein the drivers of the modulators are generic while a software-controlled manager allows the carrying of any standard 10 G/40 G/100 G data while—at the same time—being adaptively adjustable according to specific link requirements and users' requests in both dispersion-managed and uncompensated links.

Abstract translation: 用于产生不同偏振复用信号的方法，结构和系统，其中调制器的驱动器是通用的，而软件控制的管理器允许携带任何标准的10G / 40G / 100G数据，同时可自适应地调节 根据具体链路要求和用户在色散管理和无补偿链路中的请求。