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：US20150229433A1

公开(公告)日：2015-08-13

申请号：US14418286

申请日：2013-05-07

Applicant: NEC Corporation

Inventor： Yoshihisa Inada

IPC: H04J14/06 ,  H04B10/548

CPC classification number: H04J14/06 ,  H04B10/255 ,  H04B10/2557 ,  H04B10/5053 ,  H04B10/532 ,  H04B10/548 ,  H04J14/00 ,  H04J14/04 ,  H04L27/2096

Abstract: A polarization multiplexing optical transmitter of the present invention includes frequency dividing means (21) that performs frequency dividing on a clock signal having a Baud rate frequency, phase modulation means (8) that performs phase modulation on a light signal in accordance with the clock signal having undergone the frequency dividing, branching means (2) that branches the phase-modulated light into two light signals, delay means (10) that delays one branched light signal relative to the other branched light signal to generate light signals having phases inverted relative to each other, and polarization multiplexing means (5) that synthesizes the generated signals lights with orthogonal polarizations to generate a polarization multiplexed signal. Hence, the polarization multiplexing optical transmitter that can further improve the signal quality can be accomplished.

Abstract translation: 本发明的偏振复用光发射机包括对具有波特率频率的时钟信号进行分频的分频装置（21），根据时钟信号对光信号执行相位调制的相位调制装置（8） 已经进行了分频，将相位调制光分支成两个光信号的分支装置（2）;延迟装置（10），其相对于另一个分支光信号延迟一个分支光信号，以产生具有相对于 以及利用正交偏振合成产生的信号的偏振复用装置（5），以产生偏振复用信号。 因此，可以实现能够进一步提高信号质量的偏振复用光发送器。

公开(公告)号：US10708094B2

公开(公告)日：2020-07-07

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 ,  G06N3/08 ,  H04B10/079 ,  H04B10/2513 ,  H04B10/2507 ,  H04B10/69

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：US10236989B2

公开(公告)日：2019-03-19

申请号：US15729021

申请日：2017-10-10

Applicant: NEC Laboratories America, Inc. ,  NEC Corporation

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

IPC: H04B10/54 ,  H04Q11/00 ,  H04B10/079 ,  H04B10/516 ,  H04B10/532

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：US10038515B2

公开(公告)日：2018-07-31

申请号：US15127586

申请日：2015-03-20

Applicant: NEC Corporation

Inventor： Yoshihisa Inada

IPC: H04B10/572 ,  H04B10/61 ,  H04J14/02 ,  H01S5/0687

CPC classification number: H04J14/0227 ,  H01S5/0687 ,  H04B10/506 ,  H04B10/572 ,  H04B10/61

Abstract: [Problem] To provide an optical communication device and the like with which the optical signals output by multiple light output units can be set with an accurate wavelength interval.[Solution] An optical communication device equipped with: multiple light output units that output optical signals of mutually different wavelengths; a multiplexing unit that outputs a wavelength-multiplexed signal by multiplexing the multiple optical signals output from the multiple light output units; a reference light output unit that outputs reference light serving as a reference; a wavelength generation unit that, on the basis of the reference light, outputs multiple light beams having a wavelength interval in accordance with a prescribed frequency; and a wavelength control unit that controls the wavelength of the optical signals output by the light output units in accordance with the interference component between the wavelength-multiplexed signal and light with the wavelength of at least one of the multiple light beams.

公开(公告)号：US09680598B2

公开(公告)日：2017-06-13

申请号：US14770197

申请日：2013-10-18

Applicant: NEC Corporation

Inventor： Yoshihisa Inada

IPC: H04J14/06 ,  H04J14/02 ,  H04B10/532 ,  H04B10/516 ,  H04B10/54

CPC classification number: H04J14/06 ,  H04B10/5161 ,  H04B10/532 ,  H04B10/541 ,  H04J14/02

Abstract: A wavelength division multiplexing optical transmission apparatus includes a plurality of polarization multiplexing optical modulation means, polarization-maintaining optical multiplexing means, and delay adjustment means. The polarization multiplexing optical modulation means generate a plurality of polarization multiplexed optical modulation signals having different wavelengths. The polarization-maintaining optical multiplexing means multiplexes the wavelengths of the polarization multiplexed optical modulation signals to generate a wavelength multiplexed optical signal (WDM). The delay adjustment means adjusts a delay such that light intensities of polarization multiplexed optical modulation signals having adjacent wavelengths in the wavelength multiplexed optical signal (WDM) vary inversely with respect to each other.

公开(公告)号：US20130094851A1

公开(公告)日：2013-04-18

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: H04B10/08

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：US12301295B2

公开(公告)日：2025-05-13

申请号：US18022932

申请日：2021-09-27

Applicant: NEC Corporation

Inventor： Yutaka Yano ,  Yoshihisa Inada ,  Takehiro Nakano ,  Ryuji Aida

IPC: H04B10/524 ,  H04B10/071 ,  H04B10/077 ,  H04J14/02 ,  H04J14/08

Abstract: In order to avoid the phenomenon of communication being impeded and signals transmitted by the plurality of slave devices overlapping, a communication system according to the present invention has the first master device transmits a first pulsed light to the first transmission path and receives a return light of the first pulsed light from the second transmission path; each of the slave devices modulates the first pulsed light, and outputs the modulated first pulsed light as the return light of the first pulsed light; and the width of the first pulsed light is narrower than double the shortest distance from among the transmission distance between the slave device outputting the return light and the transmission distance between the first master device and the slave device outputting the return light.

公开(公告)号：US11451317B2

公开(公告)日：2022-09-20

申请号：US17355964

申请日：2021-06-23

Applicant: NEC Corporation

Inventor： Yoshihisa Inada

IPC: H04J14/02 ,  H04B10/073 ,  H04B10/291 ,  H04J14/00 ,  H04B10/50

Abstract: An optical transmission system includes: a terminal station device that transmits a wavelength multiplexed optical signal resulting from multiplexing an optical signal and dummy light; and an optical add-drop multiplexer that receives respective wavelength multiplexed optical signals transmitted from a plurality of the terminal station devices and performs add-drop processing on the wavelength multiplexed optical signals. The dummy light has a wavelength arrangement in which adjacent wavelengths are arranged with equal spacing, and the wavelength arrangement of the dummy light differs between the terminal station devices.

公开(公告)号：US09419744B2

公开(公告)日：2016-08-16

申请号：US14418286

申请日：2013-05-07

Applicant: NEC Corporation

Inventor： Yoshihisa Inada

IPC: H04B10/00 ,  H04J14/00 ,  H04J14/06 ,  H04B10/255 ,  H04B10/2557 ,  H04B10/548 ,  H04B10/50 ,  H04B10/532 ,  H04L27/20 ,  H04J14/04

CPC classification number: H04J14/06 ,  H04B10/255 ,  H04B10/2557 ,  H04B10/5053 ,  H04B10/532 ,  H04B10/548 ,  H04J14/00 ,  H04J14/04 ,  H04L27/2096

Abstract: A polarization multiplexing optical transmitter of the present invention includes frequency dividing means (21) that performs frequency dividing on a clock signal having a Baud rate frequency, phase modulation means (8) that performs phase modulation on a light signal in accordance with the clock signal having undergone the frequency dividing, branching means (2) that branches the phase-modulated light into two light signals, delay means (10) that delays one branched light signal relative to the other branched light signal to generate light signals having phases inverted relative to each other, and polarization multiplexing means (5) that synthesizes the generated signals lights with orthogonal polarizations to generate a polarization multiplexed signal. Hence, the polarization multiplexing optical transmitter that can further improve the signal quality can be accomplished.

Abstract translation: 本发明的偏振复用光发射机包括对具有波特率频率的时钟信号进行分频的分频装置（21），根据时钟信号对光信号执行相位调制的相位调制装置（8） 已经进行了分频，将相位调制光分支成两个光信号的分支装置（2）;延迟装置（10），其相对于另一个分支光信号延迟一个分支光信号，以产生具有相对于 以及利用正交偏振合成产生的信号的偏振复用装置（5），以产生偏振复用信号。 因此，可以实现能够进一步提高信号质量的偏振复用光发送器。