公开(公告)号：US20220236105A1

公开(公告)日：2022-07-28

申请号：US17583168

申请日：2022-01-24

Applicant: NEC Laboratories America, Inc.

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

IPC: G01H9/00 ,  G01D5/353

Abstract: An advance in the art is made according to aspects of the present disclosure directed to the detection and localization of a substantially static weight situated on aerial telecommunications fiber optic cable through the effect of phase-distributed acoustic sensing (ϕ-DAS) and signal analysis of ambient data. In sharp contrast to the prior art, our inventive method does not require a special optical fiber arrangement or type of fiber nor is it susceptible to range limitations that plague the prior art.

公开(公告)号：US11387898B2

公开(公告)日：2022-07-12

申请号：US17035551

申请日：2020-09-28

Applicant: NEC Laboratories America, Inc.

Inventor： Ting Wang ,  Ming-Fang Huang ,  Yaowen Li ,  Philip Ji

IPC: H04B10/079 ,  G01D5/353

Abstract: Aspects of the present disclosure describe optical fiber sensing systems, methods and structures disclosing a distributed optical fiber sensor network constructed on a switched optical fiber telecommunications infrastructure to detect temperatures, acoustic effects, and vehicle traffic—among others—demonstrated with a number of different network topologies.

公开(公告)号：US11366231B2

公开(公告)日：2022-06-21

申请号：US16660699

申请日：2019-10-22

Applicant: NEC Laboratories America, Inc.

Inventor： Ming-Fang Huang ,  Yuheng Chen ,  Ting Wang

IPC: G01S19/03 ,  G01H9/00

Abstract: Aspects of the present disclosure describe systems, methods and structures for determining any location on a deployed fiber cable from an optical time domain reflectometry (OTDR) curve using a movable mechanical vibration source to stimulate tiny vibration of fiber in deployed fiber cable along the cable route and a fiber sensing system at a central office to detect the vibration(s). Latitude and longitude of the location(s) of the vibration source is measured with a GPS device and a dynamic-OTDR distance is measured at central office (CO) simultaneously. The collected GPS location data and corresponding dynamic-OTDR distance data are paired and saved into a database. This saved data may be processed to graphically overlie a map thereby providing exact cable location on the map thereby providing carriers/service providers the ability to improve fiber fault location on a deployed fiber cable much faster and more accurately than presently possible using methods available in the art.

公开(公告)号：US10761014B2

公开(公告)日：2020-09-01

申请号：US14931568

申请日：2015-11-03

Applicant: NEC Laboratories America, Inc.

Inventor： Neda Cvijetic ,  Giovanni Milione ,  Ting Wang

IPC: G01N21/17 ,  G01S7/48 ,  G01S7/481 ,  G01S17/89

Abstract: A method and system for remote sensing using optical orbital angular momentum (OAM)-based spectroscopy for object recognition. The method includes applying an OAM state on a light beam to generate an optical OAM spectrum, transmitting the light beam on a remote object, receiving a reflected optical OAM spectrum associated with the remote object, and providing a high resolution image of the remote object based on the reflected optical OAM spectrum.

公开(公告)号：US10574448B2

公开(公告)日：2020-02-25

申请号：US15897930

申请日：2018-02-15

Applicant: NEC Laboratories America, Inc.

Inventor： Ivan Djordjevic ,  Ting Wang ,  Shaoliang Zhang

IPC: H04L29/06 ,  H04L9/08 ,  H04B10/70 ,  H04J14/02 ,  H04B10/11 ,  H01Q3/26 ,  H01Q3/28 ,  H01Q3/38 ,  H04L27/34 ,  H04J14/04 ,  H04B10/516 ,  H01Q3/34 ,  H01Q21/00 ,  H04L27/36 ,  H04L27/38 ,  H04B7/0413 ,  H04B10/50

Abstract: Systems and methods for quantum key distribution using orbital angular momentum (OAM)-modes-enabled secure multidimensional coded modulation. The quantum key distribution including symbols of a raw key across subcarriers and multiplexing the subcarriers to form an electrical carrier. Then optically modulating the electrical carrier with an electro-optical modulator using an optical signal. The optically modulated electrical carrier is then imposed on a pre-determined OAM mode using an optical OAM multiplexer, attenuated, and transmitted across a quantum channel. A receiver then receives the transmitted signal and demultiplexes it with an optical OAM demultiplexer to extract projections. The projections then undergo optical-to-electrical conversion using a coherent optical detector with an optical signal from a local oscillator. A resulting estimated electrical carrier is then demultiplexed into subcarriers. The subcarrier undergo phase noise cancellation and subsequent demodulation to extract estimated symbol constellation points corresponding the symbols of the raw key.

公开(公告)号：US20190236920A1

公开(公告)日：2019-08-01

申请号：US16229574

申请日：2018-12-21

Applicant: NEC Laboratories America, Inc.

Inventor： Ming-Fang Huang ,  Ting Wang

IPC: G08B13/22 ,  G01V1/00 ,  G01V1/22 ,  G06N20/00 ,  G08B19/00 ,  G08B25/08 ,  H04B10/85 ,  H04B10/27

CPC classification number: G08B13/22 ,  G01V1/001 ,  G01V1/226 ,  G06N5/04 ,  G06N20/00 ,  G08B19/00 ,  G08B25/08 ,  H04B10/27 ,  H04B10/85

Abstract: A security system is provided for a building. The security system includes a fiber optic cable arranged in various locations in the building for Distributed Vibration Sensing (DVS) and Distributed Acoustic Sensing (DAS) at the various locations. The security system further includes a machine-learning-based analyzer for selectively providing any of an early warning and a prevention of various detected conditions responsive to a machine-learning-based analysis of results from the DVS and the DAS.

公开(公告)号：US10333618B2

公开(公告)日：2019-06-25

申请号：US15964815

申请日：2018-04-27

Applicant: NEC Laboratories America, Inc.

Inventor： Ivan Djordjevic ,  Shaoliang Zhang ,  Ting Wang

IPC: H04B10/112 ,  H03M13/11 ,  H04L1/00 ,  H04L27/36 ,  H03M13/25 ,  G02B6/028 ,  H04B10/11 ,  H04B10/516 ,  H04L29/06 ,  H03M13/37 ,  H04B10/2581 ,  H04J14/04

Abstract: Aspects of the present disclosure describe systems, methods, and structures for physical layer security using hybrid free-space optical and terahertz transmission technologies that advantageously overcome atmospheric characteristics that infirmed the prior art.

公开(公告)号：US10295751B2

公开(公告)日：2019-05-21

申请号：US15907728

申请日：2018-02-28

Applicant: NEC Laboratories America, Inc.

Inventor： Ivan B. Djordjevic ,  Shaoliang Zhang ,  Ting Wang

IPC: H04J14/00 ,  G02B6/35 ,  H04Q11/00 ,  G01D5/26 ,  G01D5/353 ,  H04L29/08 ,  G02B5/32 ,  G02B26/08 ,  H04J14/06 ,  H04W84/18 ,  H04L29/06 ,  H04W4/90

Abstract: A method and network are provided for a reconfigurable optical sensor network. The method includes configuring, by a controller, the reconfigurable optical sensor network, including one or more reconfigurable optical space switches, for a type of sensor data. The method also includes generating sensor data in the type of sensor data with one or more of a plurality of bidirectional sensors. The method additionally includes sending the sensor data to one or more optical star couplers. The method further includes forwarding the sensor data from one of the one or more optical star couplers to the one of one or more reconfigurable optical space switches.

公开(公告)号：US20190109752A1

公开(公告)日：2019-04-11

申请号：US16153029

申请日：2018-10-05

Applicant: NEC Laboratories America, Inc.

Inventor： Shaoliang Zhang ,  Fatih Yaman ,  Ting Wang ,  Zhen Qu

IPC: H04L27/34 ,  H04B10/516 ,  H04B10/61 ,  H04L1/00

CPC classification number: H04L27/345 ,  H04B10/5161 ,  H04B10/541 ,  H04B10/616 ,  H04L1/0058 ,  H04L1/0061 ,  H04L27/3405

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.

公开(公告)号：US10010733B2

公开(公告)日：2018-07-03

申请号：US15412431

申请日：2017-01-23

Applicant: NEC Laboratories America, Inc.

Inventor： Junqiang Hu ,  Ting Wang

IPC: G08C19/22 ,  A62C37/50 ,  A62C13/76 ,  H04Q9/00

CPC classification number: A62C37/50 ,  A62C13/76 ,  H04Q9/00 ,  H04Q2209/82 ,  H04Q2209/883

Abstract: Aspects of the present disclosure describe apparatus, methods and systems for monitoring the operational status of fire extinguishers through the utilization of optically sensed, color profile determinations of a pressure gauge positioned on the fire extinguisher as well as the utilization of vibrational, and location sensing devices. Advantageously, monitoring apparatus according to the present disclosure are networkable, and a number of their operational characteristics may be configured via the network and associated servers. Furthermore, monitoring apparatus according to the present disclosure may employ vibrational, acceleration, GPS, RFID, and ultrasonic sensors to detect movement, location, and obstructions. In sharp contrast to the prior art, apparatus, methods and systems according to the present disclosure operate with existing fire extinguishers and provide a convenient, cost effective, and highly functional upgrade path for deployed fire extinguishers.