公开(公告)号：US20220120608A1

公开(公告)日：2022-04-21

申请号：US17506471

申请日：2021-10-20

Applicant: NEC Laboratories America, Inc.

Inventor： Junqiang HU ,  Yue-Kai HUANG ,  Ezra IP

IPC: G01H9/00 ,  G02B6/42

Abstract: Aspects of the present disclosure describe a polarization diversity combining method for coherent distributed acoustic sensing (DAS) maintaining phase continunity.

公开(公告)号：US20210356317A1

公开(公告)日：2021-11-18

申请号：US17317863

申请日：2021-05-11

Applicant: NEC Laboratories America, Inc.

Inventor： Ezra IP ,  Junqiang HU ,  Yue-Kai HUANG

IPC: G01H9/00 ,  G01D5/353

Abstract: Aspects of the present disclosure describe a coherent distributed acoustic sensing (DAS) method employing a combined complex and phase domain vibration strength estimation are employed to produce a distributed acoustic sensing output signal exhibiting mitigated Rayleigh fading effect. Operationally, a phase-domain estimator is regulated by a complex-domain estimator that provides Rayleigh fading information associated with each DAS fiber segment, which in turn is used to determine if/how a phase-domain estimator is affected by fading. In the occurrence of severe fading, the complex-domain estimator is used to produce an indication of vibration strength, wherein noise occurring in that estimator is not amplified as would be in the phase-domain estimator.

公开(公告)号：US20210255007A1

公开(公告)日：2021-08-19

申请号：US17147382

申请日：2021-01-12

Applicant: NEC Laboratories America, Inc.

Inventor： Junqiang HU ,  Ting WANG

IPC: G01D5/353

Abstract: Aspects of the present disclosure describe distributed optical fiber sensing systems, methods, and structures that advantageously employ point sensors that send sensory data/information over an attached, distributed optical fiber sensor without using a separate network or communications facility.

公开(公告)号：US20200249078A1

公开(公告)日：2020-08-06

申请号：US16783108

申请日：2020-02-05

Applicant: NEC Laboratories America, Inc.

Inventor： Junqiang HU ,  Ting WANG

IPC: G01H9/00 ,  G01D5/353

Abstract: Disclosed are improved distributed optical fiber sensing systems, methods, and structures employing disparate point sensors that utilize uni-directional signal transmission via the distributed optical fiber such that a separate communications network for the disparate point sensors is not required.

公开(公告)号：US20200007228A1

公开(公告)日：2020-01-02

申请号：US16454056

申请日：2019-06-27

Applicant: NEC LABORATORIES AMERICA, INC

Inventor： Junqiang HU ,  Ting WANG

IPC: H04B10/071 ,  H04B10/25

Abstract: Aspects of the present disclosure describe systems, methods and structures for distributed fiber sensing systems including interrogator and attached fiber in which the interrogator includes a common line card and function-specific, pluggable front end in which the line card is configurable and supports different signal processing paths and automatically senses the front-end type and uses corresponding firmware/software or signal processing path(s) to process sensed data.

公开(公告)号：US20200003612A1

公开(公告)日：2020-01-02

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 a two-stage detection for distributed vibration detection (DVS) in which a first step provides an abstracted/pre-processing data and the second step—based on the first step result—only processes locations that have or might have activity.

公开(公告)号：US20130108270A1

公开(公告)日：2013-05-02

申请号：US13667708

申请日：2012-11-02

Applicant: NEC Laboratories America, Inc.

Inventor： Shaoliang ZHANG ,  Dayou QIAN ,  Junqiang HU ,  Lei XU ,  Ting WANG

IPC: H04J14/06

CPC classification number: H04J14/06 ,  H04B10/5055

Abstract: Disclosed are universal QPSK transmitter structures and methods for generating different QPSK signals exhibiting different polarization schemes, namely PolMux, PolMod and PolSw. The bit rate of the generated signals is variable, thereby allowing the transmitter to adjust to varying network traffic conditions. Advantageously, the generated signals may be detected by analog receivers (PolSw-QPSK) and coherent receivers (PolMux-QPSK, PolMod-QPSK, and PolSw-QPSK).

Abstract translation: 公开了用于产生表现出不同偏振方案的不同QPSK信号的通用QPSK发射机结构和方法，即PolMux，PolMod和PolSw。 所产生的信号的比特率是可变的，从而允许发射机适应不同的网络业务状况。 有利地，所产生的信号可以由模拟接收机（PolSw-QPSK）和相干接收机（PolMux-QPSK，PolMod-QPSK和PolSw-QPSK）来检测。