公开(公告)号：US10917168B2

公开(公告)日：2021-02-09

申请号：US16719963

申请日：2019-12-18

Applicant: NEC Laboratories America, Inc.

Inventor： Ming-Fang Huang ,  Yue-Kai Huang ,  Ezra Ip ,  Ting Wang

IPC: H04B10/071 ,  H04B10/077 ,  G01H9/00 ,  G01M11/00

Abstract: Aspects of the present disclosure describe systems, methods and structures and applications of optical fiber sensing. Of significance, systems, methods, and structures according to aspects of the present disclosure may reuse and/or retrofit/upgrade existing optical fiber cables as part of optical fiber sensing that may find important societal application including intrusion detection, road traffic monitoring and infrastructure health monitoring. Combining such optical fiber sensing with artificial intelligence (AI) further enables powerful applications at low(er) cost.

公开(公告)号：US09369211B2

公开(公告)日：2016-06-14

申请号：US14511560

申请日：2014-10-10

Applicant: NEC Laboratories America, Inc.

Inventor： Yue Kai Huang ,  Shaoliang Zhang ,  Ezra Ip

IPC: H04B10/04 ,  H04B10/54 ,  H04B10/67

CPC classification number: H04B10/541 ,  H04B10/676 ,  H04B2210/516

Abstract: An optical communication method includes converting an optical pulse amplitude modulation (PAM) signal to a square QAM signal using an optical delay interferometer (DI) to perform all-optical PAM to QAM conversion in the DI; performing optical de-correlation of I and Q tributaries of the QAM signal to avoid frequency dependent attenuation in RF cabling which impacts signal quality; and finding optimal phase control mechanism of the DI by monitoring and equalizing down-converted I and Q electrical signal amplitudes, using coherent detection; and emulating a square quadrature amplitude modulation (QAM) optical signal with duplicated data copies.

Abstract translation: 光通信方法包括使用光学延迟干涉仪（DI）将光脉冲幅度调制（PAM）信号转换为平方QAM信号，以在DI中执行全光PAM至QAM转换; 执行QAM信号的I和Q支路的光学去相关，以避免影响信号质量的RF布线中的频率相关衰减; 并通过监测和均衡下变频的I和Q电信号幅度，使用相干检测找到DI的最佳相位控制机制; 并仿真具有重复数据副本的正方形正交幅度调制（QAM）光信号。

公开(公告)号：US20150304036A1

公开(公告)日：2015-10-22

申请号：US14689099

申请日：2015-04-17

Applicant: NEC Laboratories America, Inc.

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

IPC: H04B10/2507 ,  H04B10/25 ,  H04J14/02

CPC classification number: H04B10/25073 ,  H04B10/2543 ,  H04J14/0265

Abstract: A controller for generating higher fiber spectral efficiency without using high-order modulation formats includes operating an interleaved bidirectional transmission IBT with sub-Nyquist optical regime exchange reach for spectral efficiency.

Abstract translation: 用于在不使用高阶调制格式的情况下产生较高光纤频谱效率的控制器包括以子奈奎斯特光学方式的交换范围来操作具有频谱效率的交错双向传输IBT。

公开(公告)号：US20140313469A1

公开(公告)日：2014-10-23

申请号：US14243218

申请日：2014-04-02

Applicant: NEC Laboratories America, Inc.

Inventor： Ezra Ip

IPC: G02F1/313

CPC classification number: H04Q11/0005 ,  G02B6/2931 ,  G02F1/31 ,  H04Q2011/0026 ,  H04Q2011/0032

Abstract: An optical switch includes an array of parallel few-mode fibers stacked vertically; beam stretchers that modifies an aspect ratio between a height and a width of beams associated with each few-mode fiber; a spatial light modulator with a 2D array of independently programmed tunable pixels, wherein the spatial light modulator manipulates phase and/or amplitude at each position of an incident optical beam; a wavelength demultiplexer which can separate the spectral components of an incident beam in angle; and lenses for imaging the modes of the input array of fiber to the spatial light modulator.

Abstract translation: 光开关包括垂直堆叠的平行多模光纤阵列; 光束拉伸器，其改变与每个几模光纤相关联的光束的高度和宽度之间的纵横比; 具有独立编程的可调谐像素的2D阵列的空间光调制器，其中所述空间光调制器在入射光束的每个位置处操纵相位和/或幅度; 波长解复用器，其可以以角度分离入射光束的光谱分量; 以及用于将输入光纤阵列的模式成像到空间光调制器的透镜。

公开(公告)号：US08798480B2

公开(公告)日：2014-08-05

申请号：US13646465

申请日：2012-10-05

Applicant: NEC Laboratories America, Inc.

Inventor： Yue-Kai Huang ,  Ezra Ip ,  Dayou Qian

IPC: H04B10/04 ,  H04B10/54

CPC classification number: H04B10/541

Abstract: Structures and methods of generating 8-QAM signals through the effect of a cascaded I/Q modulator and Mach-Zhender modulator. The 8-QAM signals are generated by applying one binary sequence to the dual-drive Mach-Zehnder modulator (MZM) and two binary sequences to the I/Q modulator. Operationally, the I/Q modulator generates QPSK constellation(s), while the dual drive MZM either maintains the QPSK constellation at an out ring, or attenuates its amplitude to the inner ring and rotates its phase by π/4 phase depending on the binary data it was driven by.

Abstract translation: 通过级联I / Q调制器和Mach-Zhender调制器的影响产生8-QAM信号的结构和方法。 通过将一个二进制序列应用于双驱动马赫 - 曾德调制器（MZM）并将两个二进制序列应用于I / Q调制器来生成8-QAM信号。 在操作上，I / Q调制器产生QPSK星座，而双驱动MZM或者将QPSK星座维持在外环，或者将其振幅衰减到内环，并且根据其中的相位旋转其相位 二进制数据由它驱动。

公开(公告)号：US11982552B2

公开(公告)日：2024-05-14

申请号：US17544806

申请日：2021-12-07

Applicant: NEC Laboratories America, Inc.

Inventor： Ezra Ip ,  Yue-Kai Huang

IPC: G01D5/353 ,  G01H9/00 ,  H04B10/61

CPC classification number: G01D5/35361 ,  G01H9/004 ,  H04B10/6165

Abstract: Aspects of the present disclosure describe systems, methods. and structures for vibration detection using phase recovered from an optical transponder with coherent detection. Advantageously, our systems, methods, and structures leverage contemporary digital coherent receiver architecture in which various adaptive DSP operations performed to recover transmitted data track optical phase. The phase is extracted at low overhead cost, allowing a digital coherent transponder to perform vibration detection/monitoring as an auxiliary function to data transmission. Demonstration of vibration detection and localization based on the extraction of optical phase from payload-carrying telecommunications signal using a coherent receiver in a bidirectional WDM transmission system is shown and described.

公开(公告)号：US11960042B2

公开(公告)日：2024-04-16

申请号：US17307991

申请日：2021-05-04

Applicant: NEC Laboratories America, Inc.

Inventor： Ezra Ip ,  Yue-Kai Huang ,  Fatih Yaman

IPC: G01V1/22 ,  G01V1/38 ,  H04B10/077 ,  H04J14/02 ,  H04L7/00

CPC classification number: G01V1/226 ,  G01V1/38 ,  H04B10/077 ,  H04J14/02 ,  H04L7/0075

Abstract: Aspects of the present disclosure are directed to laser interferometric systems, methods, and structures exhibiting superior laser phase noise tolerance particularly in seismic detection applications wherein laser requirements are advantageously relaxed by employing a novel configuration wherein the same laser which generates an outgoing signal is coherently detected using the same laser as local oscillator and fiber turnarounds are employed that result in the cancellation and/or mitigation of undesired mechanical vibration.

公开(公告)号：US11692867B2

公开(公告)日：2023-07-04

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

CPC classification number: G01H9/004 ,  G02B6/4212

Abstract: A distributed optical fiber sensing (DOFS)/distributed acoustic sensing (DAS) method employing polarization diversity combining and spatial diversity combining for a DOFS/DAS system wherein the polarization diversity combining determines a temporal average product for each beating product, determines one having a max average power, rotates that one having max average power for its phase shift to produce a reference, determines a phase difference for each beating product as compared to the reference, compensates any phase difference such that all beating products exhibit a well-aligned phase; and combining the beating products; and wherein the spatial diversity combining uses the combined beating products for each location, determines a temporal average power, determines a location having a greatest average power; and combines the results and provides an indicia of the combined result(s).

公开(公告)号：US11463171B2

公开(公告)日：2022-10-04

申请号：US16885190

申请日：2020-05-27

Applicant: NEC Laboratories America, Inc.

Inventor： Yue-Kai Huang ,  Ezra Ip ,  Philip Nan Ji ,  Ming-Fang Huang

IPC: H04B10/00 ,  H04B10/2543 ,  H04B10/25 ,  H04J14/00

Abstract: Aspects of the present disclosure describe systems, methods and structures providing bidirectional optical fiber communication and sensing using the same fiber transmission band and bidirectional WDM fiber sharing such that communications channels and optical fiber sensing channel(s) coexist on the same fiber. As a result, nonlinear interaction between communications channels and interrogating pulse(s) of sensing are much reduced or eliminated.

公开(公告)号：US11320304B2

公开(公告)日：2022-05-03

申请号：US16879066

申请日：2020-05-20

Applicant: NEC Laboratories America, Inc.

Inventor： Yue-Kai Huang ,  Ezra Ip

IPC: G01H9/00

Abstract: Aspects of the present disclosure describe multi-frequency coherent distributed acoustic sensing with a single transmitter/receiver pair using an offset Tx/Rx framing scheme and an additional optical IQ modulator to generate the multiple frequency channels for DAS interrogation.