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：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。