Nec Corporation

Nec Laboratories America, Inc.

Nec Research Institute, Inc.

At&t Intellectual Property I, L.p.

Verizon Patent and Licensing Inc.

Nec Usa, Inc.

Other

Leland Stanford Junior University

Ting Wang

Philip N Ji

Lei Xu

Ivan B Djordjevic

Junqiang Nochur Hu

Dayou Qian

Shaoliang Zhang

Ming-Fang Huang

Neda Cvijetic

Yoshiaki Aono

Fatih Yaman

Yue Tian

Jianjun Yu

Sarper Ozharar

Yangmin Ding

Milorad Cvijetic

Yue-Kai Huang

Yoshihisa Inada

Ankitkumar N Patel

Yao Li

Chonggang Wang

Ezra Ip

Takaaki Ogata

Yasuhiro Aoki

Ryuji Aida

Giovanni Milione

Yi Weng

Yaowen Li

Shaobo Han

Yuheng Chen

Jian Fang

Zilong Ye

Yuanqiu Luo

Shuji Murakami

Yutaka Yano

Konstantinos Kanonakis

Wei Wei

Lusheng Ji

Tiejun J Xia

Glenn A Wellbrock

Narayan Prasad

Osamu Matsuda

Kenneth W Fasanella

Kojiro Watanabe

Jingjing Zhang

Tsutomu Tajima

Junquiang Hu

Lei Zong

Allan Schweitzer

Hussam G Batshon

Yuanda Xu

Akihiro Tanaka

Yuji Abe

Kazuo Takagi

Maximilian A Ott

Eduardo F Mateo

Eduardo Mateo Rodriquez

Yawei Yin

Tyrone Kwok

Robert Saperstein

Chuanhui Ma

Milorad Cvjetic

Lei Zhong

Lane Zong

Sampath Rangarajan

Guofei Jiang

Manmohan Chandraker

Eric Cosatto

Takanori Inoue

Yoshihiko Suemura

Kohei Nakamura

Makoto Shibutani

Yi-Hsuan Tsai

Yueping Zhang

Shinya Nakamura

Tineke Thio

Takefumi Oguma

Eduardo Rodriguez

Toshihiko Kusano

Naoto Maeda

Richard A Linke

Michael P Snyder

Stephen B Weinstein

Kai Yang

Gaurav Sharma

Arthur Dogariu

Martin Roetteler

Ruixue Fan

Rauf Izmailov

Katsuyuki Mino

Masoud Faraki

Milad Salemi

Xin Wang

Atul Singh

Jason P Jue

Lei Tao

Xiyan Li

Hadi F Ghaemi

Francesco Pittaluga

Yequn Zhang

Systems, methods, and structures for colorless distributed fiber optic sensing/distributed vibration sensing (DOFS/DVS) over dense wavelength division multiplexing (DWDM) telecommunications facilities that operate over a C-band wavelength range spanning from 1525 nm to 1565 nm wherein the DOFS/DVS systems exhibit suitable reconfigurability of its wavelength to match a wavelength of a desired testing channel providing DOFS/DVS capabilities to existing DWDM communications infrastructure as a retrofit. The DFOS/DVS systems include an optical sensor fiber; a colorless DFOS/DVS interrogator in optical communication with the optical sensor fiber and configured to generate optical pulses, introduce the generated pulses into the optical sensor fiber, and receive backscattered signals from the optical sensor fiber; and an intelligent analyzer configured to analyze colorless DFOS/DVS data received by the DFOS/DVS interrogator and determine from the backscattered signals, vibrational activity occurring at locations along the optical sensor fiber.

Colorless distributed fiber optic sensing / distributed vibration sensing

A radio-controlled, two-way acoustic modem for operating with a distributed fiber optic sensing (DFOS) system including circuitry that receives radio signals including configuration information, configures the modem to operate according to the configuration information, and generate acoustic signals that are detected by the DFOS system. The acoustic modem includes one or more sensors that detect environmental information that is encoded in the acoustic signals for further reception by the DFOS system. The received configuration information may change the operating times, sensors or other operating aspects of the modem as desired an such information may be transmitted from a fixed location or a mobile vehicle.

Telecom cable tension screening technique based on wave propagation and distributed acoustic sensing

Aspects of the present disclosure describe systems and methods that advantageously enable vibration-induced optical phase measurement at a centralized optical line terminal (OLT) in a PON architecture. In sharp contrast to existing distributed fiber sensing systems and methods, the optical phase measurements of the present disclosure do not rely on back scattering mechanisms and maintain a sufficient optical signal to noise ratio (OSNR) even after round-trip splitting loss in the PON.

Vibration sensing over passive optical networks (PONs) using forwarding optical phase retrieval and time-domain multiplexed (TDM) switching

Aspects of the present disclosure describe snow/water level detection using distributed fiber optic sensing/distributed acoustic sensing (DFOS/DAS) and an integrated ultrasonic device that advantageously operates over existing optical telecommunications facilities carrying live telecommunications traffic—or optical facilities deployed specifically for such detection. DFOS/DAS monitoring of snow/water level advantageously monitors large areas with high sensitivity while exhibiting robustness to changing environmental conditions and employs a remote (utility pole or other mounting) mounted ultrasonic sensor/transducer that provides snow/water level data in real-time as a coded vibrational signal.

Snow / water level detection with distributed acoustic sensing integrated ultrasonic device

A method for underground cable localization by fast time series template matching and distributed fiber optic sensing (DFOS) includes: providing the DFOS system including a length of optical sensor fiber; a DFOS interrogator in optical communication with the optical sensor fiber, said DFOS interrogator configured to generate optical pulses, introduce the generated pulses into the length of optical sensor fiber, and receive backscattered signals from the length of the optical sensor fiber; and an intelligent analyzer configured to analyze DFOS data received by the DFOS interrogator and determine from the backscattered signals, vibrational activity occurring at locations along the length of the optical sensor fiber; deploying a programmable vibration generator to a field location proximate to the length of optical sensor fiber; transmitting to the programmable vibration generator a unique vibration pattern to be generated by the vibration generator; and operating the programmable vibration generator to generate the unique vibration pattern transmitted; and operating the DFOS system and collecting/analyzing the determined vibrational activity to further determine vibrational activity indicative of the unique vibration pattern generated by the vibration generator.

Underground cable localization by fast time series template matching

Aspects of the present disclosure describe Rayleigh-based DTSS that utilizes few-mode fiber (FMF), which supports multiple spatial modes. For each spatial mode, a wavelength-scanning configuration gives the relative wavelength (or frequency) shift between two consecutive measurements. The temperature and strain changes can therefore be separated through different temperature/strain sensitivities of various mode-pairs. Advantageously, Rayleigh-based DTSS according to aspects of the present disclosure removes temperature-strain ambiguity, enhances measurement accuracy, reduces errors. and enables new features for multi-parameter sensing.

Few-mode Rayleigh-based distributed fiber sensor for simultaneous temperature and strain sensing

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.

Fiber identification without cut point using distributed fiber optic sensing

A fiber optic sensing cable located along a side of a paved road and runs parallel to a driving direction is monitored by distributed fiber optic sensing (DFOS) using Rayleigh backscattering generated along the length of the optical sensor fiber cable under dynamic vehicle loads. The interaction of vehicles with roadway locations exhibiting distressed pavement generates unique patterns of localized signals that are identified/distinguished from signals resulting from vehicles operating on roadway exhibiting a smooth pavement surface. Machine learning methods are employed to estimate an overall road surface quality as well as localizing pavement damage. Power spectral density estimation, principal component analysis, support vector machine (SVM) combined with principal component analysis (PCA), local binary pattern (LBP), and convolutional neural network (CNN) are applied to develop the machine learning models.

Road surface conditions detection by distributed optic fiber system

A method for time synchronization using distributed fiber optic sensing (DFOS) that employs several trusted time beacons that are attached to the DFOS sensing fiber which in turn is connected to the DFOS interrogator. The beacons transmit their signal via two different mediums, (1) wirelessly to sensor nodes in the coverage area, and (2) through vibrations on fiber to the DFOS/DAS system located at a trusted area such as the central office. Wireless broadcast to nearby sensors includes a timestamp and beacon ID. All the sensors in the field use one of the beacons in their vicinity (the one with the strongest signal) as their time reference and send the data back with the corresponding beacon index.

Time synchronization method with trusted beacons and distributed fiber sensing

Physimetric-based data security for coded distributed temperature sensing (DTS) in which physimetric information is extracted from a coded-DTS interrogator which is unique for each interrogator at each operating run time—and used to reconstruct a final temperature determination from DTS data. The physimetric information includes coded-DTS pulse code and coded-DTS pulse profile information as a key to permit secure sharing with authorized users. The pulse code and pulse profile information are encrypted and made available to an authorized user. The authorized user can then decrypt the pulse code and pulse profile information and subsequently use this key information (pulse profile and pulse code files) to retrieve temperature information from for example, a remote computer providing a continuous raw data feed—without being susceptible to eavesdropping. The pulse profile and pulse code files permit reconstruction of temperature from DTS continuous raw data feed which have no meaningful informational value to an eavesdropper who has no access to the unencrypted pulse profile and pulse code information.

Physimetric-based data security for coded distributed temperature sensing

Aspects of the present disclosure describe systems, methods, and structures for anti-spoofing 3D face reconstruction using infrared structured light that advantageously reconstructs 3D face structures for facial recognition and detect face surface material(s) such that human skin may be effectively distinguished from artifacts thereby providing additional security for facial recognition including immunity from 2D/3D print attacks including face masks and special make-ups.

Anti-spoofing 3D face reconstruction using infrared structure light

Aspects of the present disclosure describe distributed fiber optic sensor systems, methods, and structures that advantageously enable/provide for the proper placement/assignment of sensors in the DFOS network to provide for high reliability, fault tolerant operation that survives multiple fiber failures.

Distributed fiber optic sensor placement with shared protection

Systems and methods for performing the dynamic anomaly localization of utility pole aerial/suspended/supported wires/cables by distributed fiber optic sensing. In sharp contrast to the prior art, our inventive systems and methods according to aspects of the present disclosure advantageously identify a 'location region' on a utility pole supporting an affected wire/cable, thereby permitting the identification and reporting of service personnel that are uniquely responsible for responding to such anomalous condition(s).

Dynamic anomaly localization of utility pole wires

A fiber-based roadside condition sensing system is provided. The system includes a fiber optic cable arranged in various roadside locations for Distributed Vibration Sensing (DVS) and Distributed Acoustic Sensing (DAS) at the various roadside locations. The 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.

Fiber sensing on roadside applications

Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) systems, methods, and structures that advantageously identify location(s) of construction—or other activities—taking place along fiber optic cable routes that can damage the fiber optic cables.

Object localization and threat classification for optical cable protection

Growing community of inventors

West Windsor, NJ, United States of America

Ting Wang