公开(公告)号：US11700067B2

公开(公告)日：2023-07-11

申请号：US17468655

申请日：2021-09-07

Applicant: NEC Laboratories America, Inc.

Inventor： Fatih Yaman ,  Shinsuke Fujisawa ,  Hussam Batshon ,  Yoshinari Takigawa ,  Ryu Kurahashi ,  Ryuji Aida ,  Kohei Nakamura ,  Takanori Inoue ,  Eduardo Rodriguez ,  Yoshihisa Inada

IPC: H04Q11/00 ,  H04B10/80 ,  G02B6/44

CPC classification number: H04B10/80 ,  G02B6/4427 ,  H04Q11/0001

Abstract: Aspects of the present disclosure describe a three-way branching unit switch module having a small footprint suitable for application in an undersea application.

公开(公告)号：US11159200B2

公开(公告)日：2021-10-26

申请号：US16258586

申请日：2019-01-26

Applicant: NEC Laboratories America, Inc.

Inventor： Yue-Kai Huang ,  Ezra Ip ,  Giovanni Milione ,  Fatih Yaman

IPC: H04B1/00 ,  H04B1/7136 ,  G01H9/00 ,  H04B1/715 ,  H04B1/7143 ,  H04B14/00 ,  H04B1/713

Abstract: Aspects of the present disclosure describe systems, methods, and structures for high speed frequency hopping distributed acoustic sensing using an acousto-optic modulated (AOM), gated re-circulating loop and a frequency shifted receiver local oscillator. Using the re-circulating loop controlled by the AOM to generate frequency-hopping pulse(s) increases DAS acoustic bandwidth overcomes infirmities exhibited in the art that generate multiple frequency patterns that are not suitable for long-distance DAS. Additionally, by employing frequency shifted local oscillator (LO) with asymmetric in band detection, bandwidth requirements are reduced by one half.

公开(公告)号：US10833770B2

公开(公告)日：2020-11-10

申请号：US16449319

申请日：2019-06-21

Applicant: NEC Laboratories America, Inc.

Inventor： Shaoliang Zhang ,  Fatih Yaman ,  Eduardo Rodriguez ,  Yoshihisa Inada ,  Kohei Nakamura ,  Takanori Inoue

IPC: H04B10/2543 ,  G06K9/62 ,  H04L27/26 ,  G06N3/08 ,  H04B10/2531 ,  H04B10/61 ,  H04L27/20 ,  H04B10/40 ,  H04B10/50 ,  H04B10/60

Abstract: Aspects of the present disclosure describe systems, methods and structures for optical fiber nonlinearity compensation using neural networks that advantageously employ machine learning (ML) algorithms for nonlinearity compensation (NLC) that advantageously provide a system-agnostic model independent of link parameters, and yet still achieve a similar or better performance at a lower complexity as compared with prior-art methods. Systems, methods, and structures according to aspects of the present disclosure include a data-driven model using the neural network (NN) to predict received signal nonlinearity without prior knowledge of the link parameters. Operationally, the NN is provided with intra-channel cross-phase modulation (IXPM) and intra-channel four-wave mixing (IFWM) triplets that advantageously provide a more direct pathway to underlying nonlinear interactions.

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：US10401564B2

公开(公告)日：2019-09-03

申请号：US16155787

申请日：2018-10-09

Applicant: NEC Laboratories America, Inc.

Inventor： Fatih Yaman ,  Shaoliang Zhang ,  Eduardo Mateo Rodriguez ,  Takanori Inoue ,  Kohei Nakamura ,  Yoshihisa Inada ,  Takaaki Ogata

IPC: G02B6/02 ,  G02B6/036 ,  H04B10/2569 ,  G02B6/38

Abstract: Aspects of the present disclosure describe fiber nonlinearity induced transmission penalties are reduced both in fibers with large polarization-mode dispersion, and in coupled-core multicore fibers (CC-MCF). In the case of coupled multi-core fibers, the requirement for modal delay is less.

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：US20180109067A1

公开(公告)日：2018-04-19

申请号：US15586209

申请日：2017-05-03

Applicant: NEC Laboratories America, Inc.

Inventor： Fatih Yaman ,  Shaoliang Zhang ,  Eduardo Mateo Rodriquez ,  Takanori Inoue ,  Yoshihisa Inada ,  Takaaki Ogata

IPC: H01S3/094 ,  H01S3/067

CPC classification number: H01S3/094053 ,  G02B6/12002 ,  G02B6/2804 ,  H01S3/06729 ,  H01S3/06737 ,  H01S3/06754 ,  H01S3/094003 ,  H01S3/094019 ,  H01S3/094038 ,  H01S3/094069 ,  H01S3/1608

Abstract: An optical communication substrate includes a plurality of cores to communicate optical signals; a rectangular input delivering a pump laser, and a shaped portion to combine the optical signals and the pump laser into a ring geometry at an output.

公开(公告)号：US20180102626A1

公开(公告)日：2018-04-12

申请号：US15724755

申请日：2017-10-04

Applicant: NEC Laboratories America, Inc.

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

IPC: H01S3/23 ,  H01S3/094 ,  H04B10/291 ,  H04B10/293

CPC classification number: H01S3/2316 ,  H01S3/06708 ,  H01S3/06737 ,  H01S3/06754 ,  H01S3/06758 ,  H01S3/094003 ,  H01S3/094011 ,  H01S3/094019 ,  H01S3/094053 ,  H01S3/1608 ,  H01S3/302 ,  H04B10/2912 ,  H04B10/2916 ,  H04B10/2935

Abstract: An unrepeatered transmission system includes a receiver coupled to a receive span; a transmitter coupled to the receive span; and a plurality of cascaded amplifiers in the receive span with dedicated fiber cores to supply one or more optical pumps from the receiver to each amplifier, wherein the plurality of cascaded amplifiers increase system reach by increasing the length of a back span in an unrepeatered link.

公开(公告)号：US09819530B2

公开(公告)日：2017-11-14

申请号：US15079848

申请日：2016-03-24

Applicant: NEC Laboratories America, Inc.

Inventor： Fatih Yaman ,  Shaoliang Zhang ,  Eduardo Mateo Rodriquez ,  Yoshihisa Inada ,  Takaaki Ogata ,  Takanori Inoue

IPC: H04L27/36 ,  H04L27/34

CPC classification number: H04L27/362 ,  H04L27/34 ,  H04L27/3405 ,  H04L27/3444 ,  H04L27/36

Abstract: Methods and systems for communication with an optimized constellation include coding an input data stream to a symbol stream according to an optimized constellation that has a non-Gray bit mapping and that has neighboring points having more than one bit difference farther apart than neighboring points having one bit difference. The symbol stream is modulated onto a transmission signal and subsequently demodulated at a receiver to produce a received symbol stream. The received symbol stream is decoded to a bitstream according to an optimized constellation that has a non-Gray bit mapping and that has neighboring points having more than one bit difference farther apart than neighboring points having one bit difference.

公开(公告)号：US20170279242A1

公开(公告)日：2017-09-28

申请号：US15462102

申请日：2017-03-17

Applicant: NEC Laboratories America, Inc.

Inventor： Fatih Yaman

IPC: H01S3/094 ,  G02B6/12 ,  H01S3/106 ,  H01S3/067 ,  H01S3/16

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.