Patents Assigned to NEC Laboratories America, Inc.
  • Publication number: 20220196462
    Abstract: Distributed fiber optic sensing (DFOS) systems, methods and structures for determining the proximity of vibration sources located perpendicular to a sensor fiber that is part of the DFOS system that may potentially threaten/damage or otherwise compromise the sensor fiber itself. Systems, methods, and structures according to aspects of the present disclosure employ Artificial Intelligence (AI) methodology(ies) that use as input a fundamental physical understanding of wave propagation and attenuation in the ground along with Bayesian inference and Maximum Likelihood Estimation (MLE) techniques for estimating/determining the proximity of potentially damaging vibration sources to the optical sensor fiber.
    Type: Application
    Filed: December 20, 2021
    Publication date: June 23, 2022
    Applicant: NEC Laboratories America, Inc.
    Inventors: Shaobo HAN, Ming-Fang HUANG, Yuheng CHEN, Milad SALEMI
  • Publication number: 20220196464
    Abstract: Aspects of the present disclosure describe an unsupervised context encoder-based fiber sensing method that detects anomalous vibrations proximate to a sensor fiber that is part of a distributed fiber optic sensing system (DFOS) such that damage to the sensor fiber by activities producing and anomalous vibrations are preventable. Advantageously, our method requires only normal data streams and a machine learning based operation is utilized to analyze the sensing data and report abnormal events related to construction or other fiber-threatening activities in real-time. Our machine learning algorithm is based on waterfall image inpainting by context encoder and is self-trained in an end-to-end manner and extended every time the DFOS sensor fiber is optically connected to a new route. Accordingly, our inventive method and system it is much easier to deploy as compared to supervised methods of the prior art.
    Type: Application
    Filed: December 20, 2021
    Publication date: June 23, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Shaobo HAN, Ming-Fang HUANG, Eric COSATTO
  • Publication number: 20220196461
    Abstract: An advance in the art is made according to aspects of the present disclosure directed to a DAS method that utilizes a differential phase to detect phase change(s) between two locations of a DAS sensing fiber to ascertain vibrational/acoustic activities/environment at intermediary fiber location(s) between the two locations. Additionally, systems, methods, and structures according to aspects of the present disclosure may employ a fiber coil comprising a segment of fiber wrapped in acoustic sensitive material (“acoustic signal collector”). The material responds to an environmental acoustic signal, which results in strain(s) applied to the fiber. Furthermore, rather than using a measured phase difference between the two ends of the fiber coil, systems, methods, and structures according to aspects of the present disclosure utilize all samples collected from one end of the fiber coil to the other end of the fiber coil (the left side of the coil to the right side of the coil)—which may be extended further.
    Type: Application
    Filed: December 20, 2021
    Publication date: June 23, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Junqiang Nochur HU, Ting WANG, Shuji MURAKAMI
  • Publication number: 20220196463
    Abstract: A fiber optic sensing technology for vehicle run-off-road incident automatic detection by an indicator of sonic alert pattern (SNAP) vibration patterns. A machine learning method is employed and trained and evaluated against a variety of heterogeneous factors using controlled experiments, demonstrating applicability for future field deployment. Extracted events resulting from operation of our system may be advantageously incorporated into existing management systems for intelligent transportation and smart city applications, facilitating real-time alleviation of traffic congestion and/or providing a quick response rescue and clearance operation.
    Type: Application
    Filed: December 20, 2021
    Publication date: June 23, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Shaobo HAN, Yuheng CHEN, Ming-Fang HUANG, Tingfeng LI
  • Publication number: 20220187121
    Abstract: Aspects of the present disclosure describe systems, methods and structures for coherent distributed sensing that employs a moving average method among locations along a sensing fiber employing a user configured number of taps that involves location grouping and a group's internal phase alignment followed by an inter-group phase alignment and combining. Our method employs two steps of rotation to achieve the alignment: intra-group rotation and inter-group rotation to align the phase of all participating sensing fiber locations.
    Type: Application
    Filed: December 12, 2021
    Publication date: June 16, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Junqiang HU, Yue-Kai HUANG, Ezra IP
  • Publication number: 20220182170
    Abstract: Aspects of the present disclosure describe systems, methods. and structures directed to an integrated 3-way branching unit switch module suitable for undersea application.
    Type: Application
    Filed: December 6, 2021
    Publication date: June 9, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Fatih YAMAN, Shinsuke FUJISAWA, Hussam BATSHON, Takigawa YOSHINARI, Ryuji AIDA, Takanori INOUE, Eduardo Rodriguez, Yoshihisa INADA
  • Publication number: 20220173808
    Abstract: Aspects of the present disclosure describe systems, methods. and structures in which guided acoustic Brillouin (GAWBS) noise is measured using a homodyne measurement technique and demonstrated using a number of optical fibers, such fibers being commonly used in contemporary optical communications systems. The measurements are made with single spans and determined to be consistent with separate multi-span long-distance measurements. Additionally, a technique for preparing an optical fiber exhibiting superior GAWBS noise characteristics by reducing coherence length of the optical fiber by spinning the fiber at a high rate during the drawing process such that birefringence coherence length is reduced.
    Type: Application
    Filed: December 1, 2021
    Publication date: June 2, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Fatih YAMAN, Kohei NAKAMURA, Takanori INOUE, Eduardo Mateo RODRIGUEZ, Shinsuke FUJISAWA, Hussam BATSHON, Yoshihisa INADA, Takaaki OGATA
  • Publication number: 20220149932
    Abstract: 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 fiber failures.
    Type: Application
    Filed: October 7, 2021
    Publication date: May 12, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Philip JI, Ting WANG, Zilong YE
  • Publication number: 20220146304
    Abstract: Aspects of the present disclosure are directed to improved systems, methods, and structures providing coherent detection of DAS. In sharp contrast to the prior art, systems, methods, and structures according to aspects of the present disclosure advantageously reduce the beating diversity terms such that required memory and bandwidth are reduced over the art.
    Type: Application
    Filed: November 9, 2021
    Publication date: May 12, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventor: Junqiang HU
  • Publication number: 20220136891
    Abstract: A device may receive, from a fiber sensor device, sensing data associated with a fiber optic cable, the sensing data being produced by an activity that poses a threat of damage to the fiber optic cable, and the sensing data identifying: amplitudes of vibration signals, frequencies of the vibration signals, patterns of the vibration signals, times associated with the vibration signals, and locations along the fiber optic cable associated with the vibration signals. The device may process, with a machine learning model, the sensing data to determine a threat level of the activity to the fiber optic cable, the machine learning model having been trained based on historical information regarding detected vibrations, historical information regarding sources of the detected vibrations, and historical information regarding threat levels to the fiber optic cable. The device may perform one or more actions based on the threat level to the fiber optic cable.
    Type: Application
    Filed: November 3, 2020
    Publication date: May 5, 2022
    Applicants: Verizon Patent and Licensing Inc., NEC Laboratories America, Inc., NEC Corporation
    Inventors: Tiejun J. XIA, Glenn A. WELLBROCK, Ming-Fang HUANG, Ting WANG, Yoshiaki AONO
  • Publication number: 20220128383
    Abstract: Aspects of the present disclosure describe DAS/DVS DFOS systems, methods, and structures that advantageously enable/provide OTDR measurement(s).
    Type: Application
    Filed: October 7, 2021
    Publication date: April 28, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Yue-Kai Huang, Ezra lp
  • Publication number: 20220128384
    Abstract: Aspects of the present disclosure describe systems methods and structures for avoiding saturation caused phase jump in systems that extract information from the phase of a complex sequence and exhibit an overflow or “spike” in the output of a high-pass filter. Operationally, during phase unwrapping—when an output signal exceeds a supported range—it is adjusted to be back in range by adding N·2?, to a phase where N is negative or positive integer, depending on the direction to be adjusted.
    Type: Application
    Filed: October 26, 2021
    Publication date: April 28, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventor: Junqiang HU
  • Publication number: 20220120925
    Abstract: Aspects of the present disclosure describe the localization of a utility pole by distributed fiber sensing of aerial fiber cable suspended from the utility pole.
    Type: Application
    Filed: October 18, 2021
    Publication date: April 21, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Yue TIAN, Shaobo HAN, Sarper OZHARAR, Yangmin DING, You LU
  • Publication number: 20220120608
    Abstract: Aspects of the present disclosure describe a polarization diversity combining method for coherent distributed acoustic sensing (DAS) maintaining phase continunity.
    Type: Application
    Filed: October 20, 2021
    Publication date: April 21, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Junqiang HU, Yue-Kai HUANG, Ezra IP
  • Publication number: 20220085896
    Abstract: Aspects of the present disclosure describe a three-way branching unit switch module having a small footprint suitable for application in an undersea application.
    Type: Application
    Filed: September 7, 2021
    Publication date: March 17, 2022
    Applicants: NEC Laboratories America, Inc., NEC Corporation
    Inventors: Fatih YAMAN, Shinsuke FUJISAWA, Hussam BATSHON, Yoshinari Takigawa, Ryu Kurahashi, Ryuji Aida, Kohei NAKAMURA, Takanori INOUE, Eduardo RODRIGUEZ, Yoshihisa INADA
  • Publication number: 20220086541
    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.
    Type: Application
    Filed: September 7, 2021
    Publication date: March 17, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventor: Philip JI
  • Publication number: 20220065977
    Abstract: Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) systems, methods, and structures that advantageously enable city-scale acoustic impulse detection and localization using standard, live aerial telecommunications optical fiber cables through the use of distributed acoustic sensing exhibiting an error of less than 1.22 m.
    Type: Application
    Filed: August 24, 2021
    Publication date: March 3, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Sarper OZHARAR, Yue TIAN, Shaobo HAN, Ting WANG, Yangmin DING
  • Publication number: 20220065690
    Abstract: Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) systems, methods, and structures that advantageously enable anomaly detection resulting from construction—or other activity based on image processing that may advantageously detect/notify/prevent damage to a fiber optic network infrastructure before such damage occurs.
    Type: Application
    Filed: August 24, 2021
    Publication date: March 3, 2022
    Applicants: NEC LABORATORIES AMERICA, INC, NEC Corporation, Verizon Patent and Licensing Inc.
    Inventors: Shaobo HAN, Ming-Fang HUANG, Yuheng CHEN, Milad SALEMI, Ting WANG, Yoshiaki AONO, Glenn WELLBROCK, Tiejun XIA
  • Publication number: 20220057254
    Abstract: Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) systems, methods, and structures that employ a distributed fiber optic sensor placement procedure that advantageously provides a desirable sensor coverage over a network at minimal cost.
    Type: Application
    Filed: August 18, 2021
    Publication date: February 24, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Philip JI, Ting WANG, Zilong YE
  • Publication number: 20220011195
    Abstract: Aspects of the present disclosure describe a method for estimating mode field distribution in optical fibers from guided acoustic-wave Brillouin scattering wherein light for which the optical mode-field distribution is determined remains in the optical fibers and the distribution is made for light inside the fiber, and not at a fiber/air interface or other perturbation points to the fiber resulting in a more accurate representation of the optical mode-field distribution in the fiber. Since light is always in the fiber during the determination, no complicated fiber preparation steps or procedures are required and the mode-field distribution is determined as an average distribution along the length of the fiber under test.
    Type: Application
    Filed: June 7, 2021
    Publication date: January 13, 2022
    Applicants: NEC LABORATORIES AMERICA, INC, NEC Corporation
    Inventors: Fatih YAMAN, Eduardo Mateo RODRIGUEZ, Shinsuke FUJISAWA, Hussam BATSHON, Kohei NAKAMURA, Takanori INOUE, Yoshihisa INADA, Takaaki OGATA