公开(公告)号：US11566937B2

公开(公告)日：2023-01-31

申请号：US16879505

申请日：2020-05-20

申请人： NEC Laboratories America, Inc.

发明人： Ezra Ip ,  Yue-Kai Huang ,  Junqiang Hu ,  Shuji Murakami

IPC分类号： G01H9/00 ,  G01B9/02015 ,  G01B9/02 ,  G01D5/353 ,  G01V1/18

摘要： Aspects of the present disclosure describe Rayleigh fading mitigation via short pulse coherent distributed acoustic sensing with multi-location beating-term combination. In illustrative configurations, systems, methods, and structures according to the present disclosure employ a two stage modulation arrangement providing short interrogator pulses resulting in a greater number of sensing data points and reduced effective sectional length. The increased number of data points are used to mitigate Rayleigh fading via a spatial combining process, multi-location-beating combining (MLBC) which uses weighted complex-valued DAS beating results from neighboring locations and aligns phase signals of each of the locations, before combining them to produce a final DAS phase measurement. Since Rayleigh scattering is a random statistic, the MLBC process allows capture of different statics from neighboring locations with correlated vibration/acoustic signal. The combined DAS results minimize a total Rayleigh fade, in both dynamic fading and static fading scenarios.

公开(公告)号：US10887009B2

公开(公告)日：2021-01-05

申请号：US16596582

申请日：2019-10-08

申请人： NEC Laboratories America, Inc.

发明人： Yue-Kai Huang ,  Shaoliang Zhang ,  Ezra Ip ,  Jiakai Yu

IPC分类号： G06N3/08 ,  G06N3/04 ,  H04L27/34 ,  H04B10/07 ,  H04B10/079

摘要： Aspects of the present disclosure describe systems, methods and structures in which a hybrid neural network combining a CNN and several ANNs are shown useful for predicting G-ONSR for Ps-256QAM raw data in deployed SSMF metro networks with 0.27 dB RMSE. As demonstrated, the CNN classifier is trained with 80.96% testing accuracy to identify channel shaping factor. Several ANN regression models are trained to estimate G-OSNR with 0.2 dB for channels with various constellation shaping.

公开(公告)号：US10741992B2

公开(公告)日：2020-08-11

申请号：US15724755

申请日：2017-10-04

申请人： NEC Laboratories America, Inc.

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

IPC分类号： H01S3/23 ,  H01S3/094 ,  H04B10/291 ,  H04B10/293 ,  H01S3/067 ,  H01S3/16 ,  H01S3/30

摘要： 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：US20180136016A1

公开(公告)日：2018-05-17

申请号：US15811061

申请日：2017-11-13

申请人： NEC Laboratories America, Inc.

发明人： Fatih Yaman ,  Shaoliang Zhang ,  Ezra Ip ,  Yue-Kai Huang ,  Giovanni Milione

IPC分类号： G01D5/353 ,  G01M11/00

CPC分类号： G01D5/35364 ,  G01M11/3118 ,  G01M11/3145 ,  G01M11/3154

摘要： Methods and systems for Brillouin optical time-domain reflectometry include optically filtering out non-Brillouin signals reflected from a fiber. Brillouin signals reflected from the fiber are coupled with a local oscillator to produce a Brillouin shift signals. The Brillouin shift signals are converted to an electrical domain using a photodetector. The electrical Brillouin shift signals are converted to a digital domain using a low-speed analog-to-digital converter that has a sampling rate below a Nyquist rate sufficient to fully resolve the electrical Brillouin shift signals.

公开(公告)号：US09733108B2

公开(公告)日：2017-08-15

申请号：US14975252

申请日：2015-12-18

申请人： NEC Laboratories America, Inc.

发明人： Neda Cvijetic ,  Giovanni Milione ,  Ezra Ip ,  Ting Wang

IPC分类号： G01B11/00 ,  G01D5/34 ,  G01S17/58 ,  G06F3/03 ,  G01S17/66 ,  G01S7/481 ,  G06F3/01

CPC分类号： G01D5/34 ,  G01B11/002 ,  G01S7/4814 ,  G01S17/58 ,  G01S17/66 ,  G06F3/017 ,  G06F3/0304

摘要： A method and system for remote sensing using optical orbital angular momentum (OAM)-based spectroscopy for lateral motion detection. The method includes applying an OAM mode on a light beam to generate an OAM light beam, the OAM light beam having an optical OAM spectrum, applying an OAM optical beam tilt on the OAM light beam to generate a tilted OAM light beam, transmitting the tilted OAM light beam on a remote object, such that the remote object interacts with the tilted OAM light beam, receiving a reflected OAM spectrum associated with the remote object, the reflected OAM spectrum having power values of OAM modes on opposite sides of an OAM launch mode, and displaying lateral motion of the remote object based on the reflected OAM spectrum by comparing the power values.

公开(公告)号：US20170214463A1

公开(公告)日：2017-07-27

申请号：US15385944

申请日：2016-12-21

申请人： NEC Laboratories America, Inc.

发明人： Giovanni Milione ,  Philip Nan Ji ,  Ezra Ip ,  Shaoliang Zhang ,  Yue-Kai Huang ,  Ting Wang

IPC分类号： H04B10/25 ,  H04J14/06 ,  H04B10/2581 ,  H04B10/40 ,  H04B7/04 ,  H04J14/02 ,  H04L5/14

CPC分类号： H04B10/2503 ,  H04B7/0413 ,  H04B10/2581 ,  H04B10/40 ,  H04J14/02 ,  H04J14/06 ,  H04L5/14

摘要： Systems and methods for optical communication are disclosed that include communicating data using one or more transceiver pairs coupled to a spatial-multiplexer (S-MUX); performing bi-directional transmissions over an elliptical core optical fiber to a spatial-demultiplexer (S-DEMUX) using spatial modes to communicate data in either direction between two transceiver pairs with low crosstalk and without optical circulators or wavelength-division multiplexing (WDM); and communicating data from the S-DEMUX with g one or more transceiver pairs.

公开(公告)号：US11378443B2

公开(公告)日：2022-07-05

申请号：US16879407

申请日：2020-05-20

申请人： NEC Laboratories America, Inc.

发明人： Ezra Ip ,  Yue-Kai Huang

IPC分类号： H04B10/08 ,  H04B17/00 ,  G01H9/00 ,  H04B10/071 ,  G01B9/0209

摘要： Aspects of the present disclosure describe systems, methods and apparatus for improving the performance of Rayleigh-based phase-OTDR with correlation-based diversity combining and bias removal.

公开(公告)号：US10404398B2

公开(公告)日：2019-09-03

申请号：US15912781

申请日：2018-03-06

申请人： NEC LABORATORIES AMERICA, INC.

发明人： Ezra Ip ,  Yue-Kai Huang ,  Shuji Murakami ,  Philip Ji

IPC分类号： H04J14/02 ,  H04Q11/00

摘要： Aspects of the present disclosure describe systems, methods, and structures for passive optical add/drop multiplexing (POADM) architectures that remove the prior art requirement of an optical amplifier (i.e., repeater-less) at the POADM nodes.

公开(公告)号：US10107651B2

公开(公告)日：2018-10-23

申请号：US15811061

申请日：2017-11-13

申请人： NEC Laboratories America, Inc.

发明人： Fatih Yaman ,  Shaoliang Zhang ,  Ezra Ip ,  Yue-Kai Huang ,  Giovanni Milione

IPC分类号： G01N21/00 ,  G01D5/353 ,  G01M11/00

摘要： Methods and systems for Brillouin optical time-domain reflectometry include optically filtering out non-Brillouin signals reflected from a fiber. Brillouin signals reflected from the fiber are coupled with a local oscillator to produce a Brillouin shift signals. The Brillouin shift signals are converted to an electrical domain using a photodetector. The electrical Brillouin shift signals are converted to a digital domain using a low-speed analog-to-digital converter that has a sampling rate below a Nyquist rate sufficient to fully resolve the electrical Brillouin shift signals.

公开(公告)号：US20180262293A1

公开(公告)日：2018-09-13

申请号：US15912781

申请日：2018-03-06

申请人： NEC LABORATORIES AMERICA, INC.

发明人： Ezra Ip ,  Yue-Kai Huang ,  Shuji Murakami ,  Philip Ji

IPC分类号： H04J14/02

CPC分类号： H04J14/0215 ,  H04J14/0204 ,  H04J14/0205 ,  H04J14/0212 ,  H04J14/023 ,  H04J14/0282 ,  H04J14/0295 ,  H04Q11/0005 ,  H04Q2011/0016

摘要： Aspects of the present disclosure describe systems, methods, and structures for passive optical add/drop multiplexing (POADM) architectures that remove the prior art requirement of an optical amplifier (i.e., repeater-less) at the POADM nodes.