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公开(公告)号：US11933605B2
公开(公告)日：2024-03-19
申请号：US17577315
申请日：2022-01-17
Applicant: NEC Laboratories America, Inc.
Inventor： Fatih Yaman , Hussam Batshon , Shinsuke Fujisawa , Kohei Nakamura , Takanori Inoue , Eduardo Mateo Rodriguez , Yoshihisa Inada
CPC classification number: G01B11/272 , G01M11/33
Abstract: Aspects of the present disclosure describe estimating/measuring core-cladding concentricity error in optical fibers. In sharp contrast to the prior art, our inventive method is based on measuring a seemingly unrelated property of fibers called guided acoustic wave Brillouin scattering (GAWBS). As we shall show and describe, by analyzing this GAWBS property we advantageously determine what level of CCCE is exhibited by the optical fiber.
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公开(公告)号：US11920975B2
公开(公告)日：2024-03-05
申请号：US17314006
申请日：2021-05-06
Applicant: NEC Laboratories America, Inc.
Inventor： Ezra Ip , Yue-Kai Huang , Fatih Yaman , Shinsuke Fujisawa
IPC: G01H9/00 , H04B10/071 , H04Q11/00
CPC classification number: G01H9/004 , H04B10/071 , H04Q11/0005 , H04Q11/0067 , H04Q2011/0016 , H04Q2011/0083 , H04Q2213/13191
Abstract: Aspects of the present disclosure are directed to alternative repeater design(s) that advantageously improve signal-to-noise of distributed acoustic sensing (DAS) systems using coherent detection of Rayleigh backscatter in multi-span links including inline amplification that may be employed—for example—in undersea submarine systems. The repeater designs incorporate Rayleigh combine units (RCU) and Rayleigh drop units (RDU) to reduce Rayleigh backscatter loss as Rayleigh signal(s) is/are routed to a link that propagates the backscatter signal in an opposite direction relative to interrogation pulse(s).
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33.发明授权公开(公告)号：US11467061B2
公开(公告)日：2022-10-11
申请号：US17341033
申请日：2021-06-07
Applicant: NEC Laboratories America, Inc.
Inventor： Fatih Yaman , Eduardo Mateo Rodriguez , Shinsuke Fujisawa , Hussam Batshon , Kohei Nakamura , Takanori Inoue , Yoshihisa Inada , Takaaki Ogata
IPC: G01M11/00
Abstract: Aspects of the present disclosure describe a method for estimating mode field distribution in optical fibers from guided acoustic-wave Brillouin scattering wherein light for which the optical mode-field distribution is determined remains in the optical fibers and the distribution is made for light inside the fiber, and not at a fiber/air interface or other perturbation points to the fiber resulting in a more accurate representation of the optical mode-field distribution in the fiber. Since light is always in the fiber during the determination, no complicated fiber preparation steps or procedures are required and the mode-field distribution is determined as an average distribution along the length of the fiber under test.
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公开(公告)号：US11296786B2
公开(公告)日：2022-04-05
申请号：US17221837
申请日：2021-04-04
Applicant: NEC Laboratories America, Inc.
Inventor： Yue-Kai Huang , Ezra Ip , Fatih Yaman
IPC: H04B10/07 , H04B10/079 , H04B10/294 , H04B10/69 , G02B6/02 , G01M11/00 , H04B10/071 , H04J14/02
Abstract: Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) systems, methods, and structures that advantageously overcome problems encountered when operating DFOS systems over operational telecommunications facilities namely, cross-phase modulation, and uneven amplitude profiles through the use of a novel constant amplitude coded DFOS employing out-of-band signaling.
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公开(公告)号：US11270200B2
公开(公告)日：2022-03-08
申请号：US16285870
申请日：2019-02-26
Applicant: NEC Laboratories America, Inc.
Inventor： Shaoliang Zhang , Fatih Yaman , Ting Wang , Eduardo Rodriguez , Yoshihisa Inada , Kohei Nakamura , Takanori Inoue
Abstract: Aspects of the present disclosure describe a method for digital coherent transmission systems that advantageously provides low-complexity, single-step nonlinearity compensation based on artificial intelligence (AI) implemented in a deep neuron network (DNN).
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Patent Agency Ranking
公开(公告)号：US10476728B2
公开(公告)日：2019-11-12
申请号：US16153029
申请日：2018-10-05
Applicant: NEC Laboratories America, Inc.
Inventor： Shaoliang Zhang , Fatih Yaman , Ting Wang , Zhen Qu
Abstract: Systems and methods for optical data transport, including controlling data transport across an optical transmission medium by generating two-dimensional (2D) distribution matchers (DMs) based on probabilistic fold shaping (PFS) and arbitrary probabilistic shaping (APS). The 2D PFS-based DM is can encode any N-fold rotationally symmetrical Quadrature Amplitude Modulation (QAM) format by applying the 2D PFS-based DM only to symbols in one quadrant based on a target entropy. A fold index yield uniform distribution is determined, and is utilized to carry generated uniform distributed parity check bits across the optical transmission medium. The 2D APS-based DM can encode any arbitrary modulation formats by encoding uniform binary data to generate non-uniform target symbols, and generating a probability distribution for the target symbols by indirectly applying the 2D APS-based DM based on a target probability distribution and a detected code rate of generated FEC code.
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37.发明授权公开(公告)号：US09966975B2
公开(公告)日：2018-05-08
申请号：US15287658
申请日：2016-10-06
Applicant: NEC Laboratories America, Inc.
Inventor： Shaoliang Zhang , Fatih Yaman , Wei Zhou
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.
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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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39.发明授权Rhombic-QPSK modulation for improved tolerance to nonlinearity in fiber communication systems 有权菱形QPSK调制，用于改善光纤通信系统中对非线性的容限公开(公告)号：US09385903B2
公开(公告)日：2016-07-05
申请号：US14456427
申请日：2014-08-11
Applicant: NEC Laboratories America, Inc.
Inventor： Eduardo Mateo Rodriquez , Fatih Yaman , Shaoliang Zhang , Ting Wang
CPC classification number: H04L27/2067 , H04B2201/709709 , H04L25/03343
Abstract: This invention proposes an alternative modulation format for channels that present improved performance when such channels co-propagate with existing intensity modulated channels. This modulation format is named Rhombic-QPSK (R-QPSK) and it is designed in such a way that it presents more tolerance to phase noise created by the nonlinear interaction with the legacy channels.
Abstract translation: 本发明提出了一种用于在这种信道与现有的强度调制信道共同传播时呈现改善的性能的信道的替代调制格式。 该调制格式被称为菱形QPSK（R-QPSK），并且它被设计成使得它对由与传统通道的非线性相互作用产生的相位噪声具有更大的容限。
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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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