公开(公告)号：US11681042B2

公开(公告)日：2023-06-20

申请号：US17195538

申请日：2021-03-08

Applicant: NEC Laboratories America, Inc.

Inventor： Ming-Fang Huang ,  Ting Wang ,  Hansi Liu

IPC: G01S15/42 ,  G01D5/353 ,  G01V1/30 ,  G01V1/18

CPC classification number: G01S15/42 ,  G01D5/353 ,  G01V1/181 ,  G01V1/306

Abstract: Aspects of the present disclosure describe distributed fiber optic sensing systems, methods, and structures that advantageously are employed to determine the location and depth of underground fiber-optic facilities that may be carrying telecommunications traffic.

公开(公告)号：US11619542B2

公开(公告)日：2023-04-04

申请号：US17228675

申请日：2021-04-12

Applicant: NEC Laboratories America, Inc.

Inventor： Sarper Ozharar ,  Yue Tian ,  Yangmin Ding ,  Ting Wang

IPC: G01H9/00

Abstract: Aspects of the present disclosure describe distributed fiber optic sensing (DFOS)—distributed acoustic sensing (DAS) based systems, methods, and structures that advantageously enable and/or facilitate the determination of natural frequency(ies) of civil infrastructures.

公开(公告)号：US20210374468A1

公开(公告)日：2021-12-02

申请号：US17330832

申请日：2021-05-26

Applicant: NEC Laboratories America, Inc.

Inventor： Manmohan Chandraker ,  Ting Wang ,  Xiang Xu ,  Francesco Pittaluga ,  Gaurav Sharma ,  Yi-Hsuan Tsai ,  Masoud Faraki ,  Yuheng Chen ,  Yue Tian ,  Ming-Fang Huang ,  Jian Fang

IPC: G06K9/62 ,  G06T3/00

Abstract: Methods and systems for training a neural network include generate an image of a mask. A copy of an image is generated from an original set of training data. The copy is altered to add the image of a mask to a face detected within the copy. An augmented set of training data is generated that includes the original set of training data and the altered copy. A neural network model is trained to recognize masked faces using the augmented set of training data.

公开(公告)号：US11131578B2

公开(公告)日：2021-09-28

申请号：US16455586

申请日：2019-06-27

Applicant: NEC Laboratories America, Inc.

Inventor： Junqiang Hu ,  Ting Wang

IPC: G01H9/00

Abstract: Aspects of the present disclosure describe systems, methods and structures employing two-stage detection/analysis for distributed vibration sensing (DVS) along an optical fiber in which a first stage provides pre-processed signal data and the second stage—based on the first stage result—only processes locations that have or might have vibrational activity resulting in increased sensitivity and reduced false alarms.

公开(公告)号：US10931366B2

公开(公告)日：2021-02-23

申请号：US16830160

申请日：2020-03-25

Applicant: NEC Laboratories America, Inc.

Inventor： Ting Wang ,  Ming-Fang Huang ,  Tiejun Xia ,  Glenn Wellbrock ,  Yaowen Li ,  Philip Ji

IPC: H04B10/071 ,  G01M11/00 ,  G01D5/353 ,  H04B10/40 ,  H04B10/2575 ,  H04B10/27

Abstract: Aspects of the present disclosure describe optical fiber sensing systems, methods and structures disclosing a distributed fiber sensor network constructed on an existing, live network, data carrying, optical fiber telecommunications infrastructure to detect temperatures, acoustic effects, and vehicle traffic—among others. Of particular significance, sensing systems, methods, and structures according to aspects of the present disclosure may advantageously identify specific network locations relative to manholes/handholes and environmental conditions within those manholes/handholes namely, normal, flooded, frozen/iced, etc.

公开(公告)号：US20190234832A1

公开(公告)日：2019-08-01

申请号：US16258588

申请日：2019-01-26

Applicant: NEC Laboratories America, Inc.

Inventor： Yaowen Li ,  Jian Fang ,  Ting Wang

IPC: G01M11/00 ,  G01H9/00

Abstract: Aspects of the present disclosure describe a multilayer coding method for physical value measurements in which a multi-pulse pattern is generated through several layers, each of which is encoded with a different cyclic codeword. The total coding gain is the product of the gains of each layer advantageously allowing a long cyclic codeword to be replaced by combining several short cyclic codewords. Of particular advantage, methods according to the present disclosure provide better signal-to-noise characteristics, longer sensing distances and lower computational complexity particularly suitable for high-performance and cost-effective distributed optical fiber sensing (DOFS).

公开(公告)号：US10345138B2

公开(公告)日：2019-07-09

申请号：US15385972

申请日：2016-12-21

Applicant: NEC Laboratories America, Inc.

Inventor： Giovanni Milione ,  Philip Nan Ji ,  Ezra Ip ,  Ting Wang

IPC: G01H9/00

Abstract: A system to perform distributed acoustic sensing (DAS) in an environment with acoustic vibrations present includes at least an optical fiber positioned in said environment, wherein the optical fiber comprises N spatial channels and N laser pulses are launched into the N spatial channels of the optical fiber and propagate over a fiber length; and one or more sensors to measure N signals of acoustic vibration amplitude and frequency from each of N spatial channels, wherein the N signals are digitally added for spatial averaging and applied to determine DAS.

公开(公告)号：US10291318B2

公开(公告)日：2019-05-14

申请号：US15964790

申请日：2018-04-27

Applicant: NEC Laboratories America, Inc.

Inventor： Ivan Djordjevic ,  Shaoliang Zhang ,  Ting Wang

IPC: H04B10/00 ,  H04B10/112 ,  H03M13/11 ,  H04L1/00 ,  H04L27/36 ,  H03M13/25 ,  G02B6/028 ,  H04B10/11 ,  H04B10/516 ,  H04L29/06 ,  H04J14/00 ,  H04B10/2581 ,  H04J14/04

Abstract: Aspects of the present disclosure describe physical layer security in optical communications wherein Bessel modes are employed and significantly outperform conventional schemes with respect to secrecy and advantageously benefit from atmospheric turbulence effects with beam splitting attacks.

公开(公告)号：US10205591B2

公开(公告)日：2019-02-12

申请号：US15897944

申请日：2018-02-15

Applicant: NEC Laboratories America, Inc.

Inventor： Ivan Djordjevic ,  Ting Wang ,  Shaoliang Zhang

IPC: H04L9/08 ,  H04B10/70 ,  H04J14/02 ,  H01Q3/34 ,  H01Q21/00 ,  H04L27/36 ,  H04L27/38 ,  H04B7/0413 ,  H04L27/34 ,  H04B10/11 ,  H01Q3/26 ,  H01Q3/28 ,  H01Q3/38

Abstract: Systems and methods for orbital angular momentum (OAM)-based multidimensional signaling with multiple-input-multiple-output (MIMO). The wireless communication is achieved using a transmitter including a plurality of orthogonal pulse shapers of a multidimensional modulator, the plurality of orthogonal pulse shapers generating a multidimensional modulated signal by imposing one or more data sequences on corresponding mutually orthogonal filter impulse responses derived from multiple orthogonal basis functions including Slepian sequences. An OAM antenna array including OAM antenna elements is used such that each of the OAM antenna elements includes an azimuthal phase shifter for shifting an azimuthal phase term of a wavefront generated by an antenna element such that the OAM antenna elements impose the multidimensional modulated signal on pre-determined OAM modes of a carrier signal corresponding to the azimuthal phase term.

公开(公告)号：US10162245B2

公开(公告)日：2018-12-25

申请号：US15596043

申请日：2017-05-16

Applicant: NEC Laboratories America, Inc.

Inventor： Philip Nan Ji ,  Ting Wang

IPC: G02F1/335 ,  G01D5/353 ,  G02F1/125

Abstract: A sensing system adapted to receive backscattered signal from a sensing fiber includes a first Faraday rotator mirror; a second Faraday rotator mirror; an optical hybrid coupled to the Faraday rotator mirrors, wherein one of the mirrors is coupled with an optical path difference; a 3-port optical circulator coupled to the sensing fiber and the optical hybrid; a first photodetector coupled to the circulator; and three photodetectors coupled to the optical hybrid.