公开(公告)号：US20230152152A1

公开(公告)日：2023-05-18

申请号：US17989589

申请日：2022-11-17

Applicant: NEC Laboratories America, Inc.

Inventor： Philip JI ,  Junqiang HU ,  Ting WANG ,  Ming-Fang HUANG ,  Yuheng CHEN

IPC: G01H9/00 ,  H04B10/071 ,  G01D5/353

CPC classification number: G01H9/006 ,  H04B10/071 ,  G01D5/35361

Abstract: Disclosed are distributed fiber optic sensing arrangements that—in sharp contrast to the prior art—utilize C-OTDR capabilities to detect an optical fiber end point while still maintaining operational DFOS vibration/acoustic signal sensing functions. Advantageously, such operations are performed automatically without requiring a manual confirmation. A change is made in digital signal processing in the C-OTDR operation by bypassing a high-pass-filtering stage when calculating intensity changes such that the DC signal component is preserved and used to differentiate from a “no-fiber” section. It then calculates the no-fiber section's signal level and uses a back-tracking operation to determine the fiber end automatically.

公开(公告)号：US20230152130A1

公开(公告)日：2023-05-18

申请号：US17987805

申请日：2022-11-15

Applicant: NEC Laboratories America, Inc.

Inventor： Ming-Fang HUANG ,  Philip JI ,  Shaobo HAN ,  Ting WANG

IPC: G01D5/353 ,  G01H9/00

CPC classification number: G01D5/35358 ,  G01H9/004

Abstract: Systems, methods, and structures for efficiently identifying individual fibers located in a deployed cable that advantageously reduces laborious field efforts while reducing service outage time. The systems and methods locate a targeted fiber in a cable (“Cable ID”) and then identify the targeted fiber (“Fiber ID”) by detecting DFOS signal attentions—without cutting the optical fiber. Two distinct determinations may be made namely, Cable ID and Fiber ID. DFOS operation detects vibration signals occurring along a sensor fiber. As implemented, Cable ID is an interactive-machine learning-based algorithm that automatically locates cable position along a sensor fiber route. Fiber ID detects a signal attenuation by bending a group of fibers with bifurcation to pinpoint a targeted individual fiber within a fiber cable.

公开(公告)号：US20220230539A1

公开(公告)日：2022-07-21

申请号：US17575610

申请日：2022-01-13

Applicant: NEC Laboratories America, Inc.

Inventor： Shaobo HAN ,  Ming-Fang HUANG ,  Philip JI ,  Yueheng CHEN ,  Milad SALEMI

IPC: G08G1/04 ,  G08G1/01 ,  G06V10/48

Abstract: Aspects of the present disclosure describe DFOS systems, methods, and structures that advantageously extract road traffic from DFOS vibration patterns such that anomaly detection is possible. Sensed vibration data is represented accurately as a set of points, where each point is denoted as a tuple with elements indicating a time stamp, a location along a length of a DFOS optical sensing cable, and vibration strength detected at the location at the time. Traffic pattern detection is based on a progressive probabilistic Hough transform (PPHT) that exploits global information from an entire spatial-temporal data snapshot to assess a cause of detected vibrations.

公开(公告)号：US20220086541A1

公开(公告)日：2022-03-17

申请号：US17468543

申请日：2021-09-07

Applicant: NEC Laboratories America, Inc.

Inventor： Philip JI

IPC: H04Q11/00 ,  G02B6/35 ,  H04B10/25 ,  H04L7/00

Abstract: Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) systems, methods, and structures that advantageously employ a flexible resource sharing that balances sending distance requirements and route requirements. Such flexibility is achieved by including an ultra-fast 1×N optical switch with a DFOS interrogator and N fiber optic sensor routes. Synchronous control provides for real-time configuration/reconfiguration of the DFOS system.

公开(公告)号：US20210133512A1

公开(公告)日：2021-05-06

申请号：US17081900

申请日：2020-10-27

Applicant: NEC Laboratories America, Inc.

Inventor： Giovanni MILIONE ,  Philip JI ,  Eric COSATTO

IPC: G06K9/62 ,  G02B27/28

Abstract: Aspects of the present disclosure describe systems, methods, and structures for the machine learning based regression of complex coefficients of a linear combination of spatial modes from a multimode optical fiber.

公开(公告)号：US20200249076A1

公开(公告)日：2020-08-06

申请号：US16783119

申请日：2020-02-05

Applicant: NEC Laboratories America, Inc.

Inventor： Ezra IP ,  Yue-Kai HUANG ,  Junqiang HU ,  Philip JI ,  Shuji MURAKAMI ,  Yaowen LI

IPC: G01H9/00

Abstract: Aspects of the present disclosure describe optical fiber sensing systems, methods and structures and application employing coherent detection of backscattered signals.