公开(公告)号：US10020631B2

公开(公告)日：2018-07-10

申请号：US15462102

申请日：2017-03-17

Applicant: NEC Laboratories America, Inc.

Inventor： Fatih Yaman

IPC: H01S3/094 ,  H01S3/067 ,  H01S3/16 ,  G02B6/12 ,  H01S3/0941

CPC classification number: H01S3/094049 ,  G02B6/12002 ,  G02B6/12007 ,  H01S3/06737 ,  H01S3/094019 ,  H01S3/094053 ,  H01S3/094069 ,  H01S3/09415 ,  H01S3/1608

Abstract: A 3-dimensional (3-D) inscripted wavelength division multiplexer (WDM) coupler for optical amplifiers is provided. The 3-D WDM coupler includes a substrate. The 3-D WDM coupler further includes a 3-dimensional pump waveguide direct laser inscripted into the substrate. The 3-D WDM coupler also includes a optical pump laser coupled into the 3-dimensional pump waveguide. The 3-D WDM coupler further includes a multicore fiber coupled into cores in the direct laser inscripted substrate.

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：US20180052102A1

公开(公告)日：2018-02-22

申请号：US15678728

申请日：2017-08-16

Applicant: NEC Laboratories America, Inc.

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

IPC: G01N21/47 ,  G02B6/02 ,  G01K11/32

CPC classification number: G01N21/47 ,  G01H9/004 ,  G01K11/32 ,  G01M11/3172 ,  G01N2021/1744 ,  G01N2021/432 ,  G01N2021/638 ,  G02B6/02042

Abstract: A system and method are provided for distributed acoustic sensing in a multicore optical fiber. The system includes a transmitter for simultaneously propagating a sequence of M light pulses through the multicore optical fiber using a spatial mode selected from a set of N spatial modes provided by a spatial mode selector for the transmitter that is coupled to an input to the multicore optical fiber, with M and N being respective integers greater than one. The system further includes a receiver for receiving the sequence of M light pulses at an output of the multicore optical fiber and detecting an environmental perturbation in the multicore optical fiber based on an evaluation of a propagation of the sequence of M light pulses through the multicore optical fiber.

公开(公告)号：US09729230B2

公开(公告)日：2017-08-08

申请号：US14808414

申请日：2015-07-24

Applicant: NEC Laboratories America, Inc.

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

IPC: H04B17/00 ,  H04B10/077 ,  G02F1/01 ,  H04B10/564

CPC classification number: H04B10/0775 ,  G02F1/0123 ,  H04B10/50575 ,  H04B10/564 ,  H04B2210/075

Abstract: A system for centralized automatic bias control for a plurality of modulators, including a coupler for coupling output of each of the plurality of modulators to generate a combined modulator output. A pilot insertion device inserts a pilot tone into each of the plurality of modulators such that a different pilot tone frequency is inserted for each of the plurality of modulators. A monitoring device iteratively monitoring power (Pt) of each inserted pilot tone over time to determine whether a current modulator bias is optimal for each of the plurality of modulators, and an adjuster device iteratively adjusts the modulator bias for each of the plurality of modulators for which the current modulator bias is determined to be sub-optimal until a threshold condition has been met.

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：US20170104496A1

公开(公告)日：2017-04-13

申请号：US15287658

申请日：2016-10-06

Applicant: NEC Laboratories America, Inc.

Inventor： Shaoliang Zhang ,  Fatih Yaman ,  Wei Zhou

IPC: H03M13/27 ,  H03M13/37 ,  H04L1/00 ,  H03M13/29 ,  H04B10/58 ,  H04B10/60

CPC classification number: H04L1/0064 ,  H03M13/1102 ,  H03M13/152 ,  H03M13/2906 ,  H03M13/2948 ,  H03M13/453 ,  H04B10/58 ,  H04B10/60 ,  H04L1/0041 ,  H04L1/0045 ,  H04L1/005 ,  H04L1/0058 ,  H04L1/0065

Abstract: Systems and methods are disclosed for optically communicating data by, at a transmitter side, encoding a block of input bits by one or more outer encoders, and after interleaving the encoded bits, permuting the encoded bits according to a predetermined sequence or order, and further encoding the encoded bits by an inner encoder, and at a receiver side, decoding received bits with an inner decoder, and after the encoded bits are permuted, subsequently decoding by and outer decoder, and returning information bits at an outer decoder as an output. The soft-decision and hard-decision outputs from the outer BCH code help the inner LDPC decoder to have better estimation of the received bits and gain performance. The performance in higher-order modulation formats could be as large as 0.5 dB in one embodiment.

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：US20160105238A1

公开(公告)日：2016-04-14

申请号：US14846348

申请日：2015-09-04

Applicant: NEC Laboratories America, Inc.

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

IPC: H04B10/2537 ,  H04B10/532

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.

Abstract translation: 提供了一种没有偏振跟踪的波长转换方法。 还提供了一种系统，其将输入信号转换成包含原始信号的所有振幅，相位和极化信息的不同波长的输出信号。 该方法包括：使用偏振分集光混合器将第一波长的输入光信号分离成包含幅度和相位的多个电信号，同时保持输入信号的偏振信息，将每个幅度和相位转换为单独的 使用光电二极管的光电流，使用放大器将每个输出光电流转换成电压，使用调制器将多个电压调制到第二波长，其中分离的电信号被上变频以产生输出光学 信号，其保持与包含在输入信号中相同的幅度，相位和极化信息。

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。