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公开(公告)号：US20230344521A1
公开(公告)日：2023-10-26
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 , H04J14/08
CPC classification number: H04B10/524 , 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.
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12.发明授权公开(公告)号：US10230483B2
公开(公告)日：2019-03-12
申请号：US15558860
申请日：2016-03-15
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.
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公开(公告)号：US20180102791A1
公开(公告)日：2018-04-12
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
CPC classification number: H03M13/116 , H03M13/1171 , H03M13/2792 , H03M13/2906 , H03M13/2957 , H03M13/616 , H04B10/27 , H04B10/516 , H04B10/616 , H04L1/0041 , H04L1/0045 , H04L1/005 , H04L1/0058 , H04L1/0065
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.
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公开(公告)号：US09337868B2
公开(公告)日：2016-05-10
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
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。
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15.发明申请公开(公告)号：US20160006537A1
公开(公告)日：2016-01-07
申请号：US14770197
申请日：2013-10-18
Applicant: NEC Corporation
Inventor： Yoshihisa Inada
IPC: H04J14/06 , H04B10/532 , H04B10/54 , H04J14/02 , H04B10/516
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.
Abstract translation: 波分复用光传输装置包括多个偏振复用光调制装置，偏振保持光复用装置和延迟调节装置。 偏振复用光调制装置产生具有不同波长的多个偏振复用光调制信号。 偏振保持光复用装置将偏振复用光调制信号的波长复用以产生波长复用光信号（WDM）。 延迟调整装置调节延迟，使得在波分复用光信号（WDM）中具有相邻波长的偏振复用光调制信号的光强度相对于彼此反向变化。
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Patent Agency Ranking
公开(公告)号：US20130089327A1
公开(公告)日：2013-04-11
申请号：US13649161
申请日：2012-10-11
Applicant: NEC Laboratories America, Inc. , NEC Corporation
Inventor： Shaoliang Zhang , Lei Xu , Junqiang Hu , Fatih Yaman , Ting Wang , Yoshihisa Inada , Takaaki Ogata , Yasuhiro Aoki
CPC classification number: H04B10/5055 , H04B10/5561 , H04J14/06
Abstract: A method implemented in a transmission apparatus used in an optical fiber communications system for a polarization switched differential quaternary phase-shift keying (DQPSK) signal is disclosed. The method comprises splitting data into two or more data streams, inputting said two or more data streams to 1-bit DQPSK precoders to perform 1-bit DQPSK precoding, and multiplexing inphase outputs of the 1-bit DQPSK precoders to generate a first output; and multiplexing quadrature outputs of the 1-bit DQPSK precoders to generate a second output. Other methods, apparatuses, and systems also are disclosed.
Abstract translation: 公开了一种在用于偏振切换差分四相移键控（DQPSK）信号的光纤通信系统中使用的发送装置中实现的方法。 该方法包括将数据分成两个或更多个数据流，将所述两个或多个数据流输入到1比特DQPSK预编码器以执行1比特DQPSK预编码，以及复用1比特DQPSK预编码器的同相输出以产生第一输出; 以及复用1位DQPSK预编码器的正交输出以产生第二输出。 还公开了其它方法，装置和系统。
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公开(公告)号：US11095388B2
公开(公告)日：2021-08-17
申请号：US16649486
申请日：2018-09-18
Applicant: NEC Corporation
Inventor： Yoshihisa Inada
IPC: H04J14/02 , H04B10/2537
Abstract: The de-multiplexing unit 2 de-multiplexes an inputted optical wavelength multiplexed signal into a first optical wavelength multiplexed signal having a first wavelength band and a second optical wavelength multiplexed signal having a second wavelength band in a longer wavelength band than the first wavelength band. The first optical amplifier 3 amplifies the first optical wavelength multiplexed signal. The second optical amplifier 4 amplifies the second optical wavelength multiplexed signal. The multiplexer 5 multiplexes the amplified first optical wavelength multiplexed signal and the amplified second optical wavelength multiplexed signal and outputs the multiplexed signal to a Raman amplifier 6. The first optical amplifier 3 adjusts the amplification rate of the first optical wavelength multiplexed signal so that the intensity of light in the second wavelength band is compensated for by the Raman effect in the Raman amplifier 6.
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18.发明授权公开(公告)号：US11082144B2
公开(公告)日：2021-08-03
申请号：US16246268
申请日：2019-01-11
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.
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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.
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20.发明申请公开(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.
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