Patents Assigned to NEC LABORATORIES AMERICA
  • POLARIZATION DIVERSITY COMBINING METHOD IN COHERENT DAS MAINTAINING PHASE CONTINUITY
    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
  • DISTANCE-ROUTE RESOURCE SHARING FOR DISTRIBUTED FIBER OPTIC SENSORS
    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
  • THREE-WAY BRANCHING UNIT SWITCH MODULE HAVING SMALL FOOTPRINT
    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
  • CITY-SCALE ACOUSTIC IMPULSE DETECTION AND LOCALIZATION
    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
  • STATISTICAL IMAGE PROCESSING-BASED ANOMALY DETECTION SYSTEM FOR CABLE CUT PREVENTION
    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
  • DISTRIBUTED FIBER OPTIC SENSOR PLACEMENT PROCEDURE
    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
  • ESTIMATING MODE FIELD DISTRIBUTION IN OPTICAL FIBERS FROM GUIDED ACOUSTIC WAVE BRILLOUIN SCATTERING
    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
  • DISTRIBUTED ACOUSTIC SENSING USING MULTI-BAND TIME-GATED DIGITAL ORTHOGONAL FREQUENCY DOMAIN REFLECTOMETRY
    Publication number: 20210364345
    Abstract: Aspects of the present disclosure describe systems, methods, and structures for distributed acoustic sensing using multi-band time-gated digital orthogonal frequency domain reflectometry.
    Type: Application
    Filed: May 18, 2021
    Publication date: November 25, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Ezra IP, Yue-Kai HUANG
  • COMPLEX AND PHASE DOMAIN VIBRATION STRENGTH ESTIMATION FOR COHERENT DISTRIBUTED ACOUSTIC SENSING
    Publication number: 20210356317
    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.
    Type: Application
    Filed: May 11, 2021
    Publication date: November 18, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Ezra IP, Junqiang HU, Yue-Kai HUANG
  • PHYSICAL LAYER SECURITY IN NETWORK SENSING ARCHITECTURE
    Publication number: 20210360029
    Abstract: Aspects of the present disclosure describe physical layer security in optical telecommunications networks wherein a filtering-based physical security is provided by a wavelength tunable distributed fiber optical sensing (DFOS) system operating simultaneously on the telecommunications network.
    Type: Application
    Filed: May 13, 2021
    Publication date: November 18, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Ming-Fang HUANG, Ting WANG
  • LASER NOISE REDUCTION FOR LASER INTERFEROMETRY
    Publication number: 20210356613
    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.
    Type: Application
    Filed: May 4, 2021
    Publication date: November 18, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Ezra IP, Yue-Kai HUANG, Fatih YAMAN
  • ANTI-SPOOFING 3D FACE RECONSTRUCTION USING INFRARED STRUCTURE LIGHT
    Publication number: 20210358149
    Abstract: 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.
    Type: Application
    Filed: May 16, 2021
    Publication date: November 18, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Yue TIAN, Ting WANG, Shengtao SUN
  • REPEATER DESIGN FOR DISTRIBUTED ACOUSTIC SENSING ON MULTISPAN FIBER LINKS
    Publication number: 20210356316
    Abstract: Aspects of the present disclosure are directed to alternative repeater design(s) that advantageously improve signal-to-noise of distributed acoustic sensing (DAS) systems using coherent detection of Rayleigh backscatter in multi-span links including inline amplification that may be employed—for example—in undersea submarine systems. The repeater designs incorporate Rayleigh combine units (RCU) and Rayleigh drop units (RDU) to reduce Rayleigh backscatter loss as Rayleigh signal(s) is/are routed to a link that propagates the backscatter signal in an opposite direction relative to interrogation pulse(s).
    Type: Application
    Filed: May 6, 2021
    Publication date: November 18, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Ezra IP, Yue-Kai HUANG, Fatih YAMAN, Shinsuke FUJISAWA
  • JOINT WAVELET DENOISING FOR DISTRIBUTED TEMPERATURE SENSING
    Publication number: 20210356332
    Abstract: Aspects of the present disclosure describe systems, methods, and structures for distributed temperature sensing that employ joint wavelet denoising to achieve desirable signal-to-noise ratio(s) over extended sensor fiber distances.
    Type: Application
    Filed: May 16, 2021
    Publication date: November 18, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Jian FANG, Ting WANG
  • DISTRIBUTED ACOUSTIC SENSING USING DYNAMIC RANGE SUPPRESSION
    Publication number: 20210356776
    Abstract: Aspects of the present disclosure describe improved distributed acoustic sensing using dynamic range suppression of optical time domain reflectometry either by using a feedback loop comprising optical and electrical elements or using a nonlinear element in the electrical domain after coherent detection. When using a feedback loop, the amplitude of the periodic waveform of coherent OTDR can be inverted. This allows optical pre-compensation of the received optical signal before coherent detection with the goal of minimizing amplitude dynamic range. Alternatively, a nonlinear element in the electrical domain can reduce amplitude dynamic range before sampling by analog-to-digital converters (ADC).
    Type: Application
    Filed: May 10, 2021
    Publication date: November 18, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Ezra IP, Yue-Kai HUANG, Philip JI, Shuji MURAKAMI
  • UTILITY POLE LOCALIZATION USING DISTRIBUTED ACOUSTIC SENSING
    Publication number: 20210318504
    Abstract: Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) distributed acoustic sensing (DAS) systems, methods, and structures that advantageously provide the localization of utility poles along a route of fiber optic cable.
    Type: Application
    Filed: April 12, 2021
    Publication date: October 14, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventor: Yue TIAN
  • Continuous utility pole health monitoring based on finite element analysis and operational modal analysis using das
    Publication number: 20210318163
    Abstract: Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) systems, methods, and structures that advantageously enable and/or facilitate the continuous monitoring and identification of damaged utility poles by employing a DFOS distributed acoustic sensing (DAS) methodology in conjunction with a finite element analysis and operational modal analysis. Of particular advantage and in further contrast to the prior art, systems, methods, and structures according to aspects of the present disclosure utilize existing optical fiber supported/suspended by the utility poles as a sensing medium for the DFOS/DAS operation.
    Type: Application
    Filed: April 10, 2021
    Publication date: October 14, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Yangmin DING, Yue TIAN, Sarper Ozharar, Ting Wang
  • VEHICLE SPEED, DIRECTION, AND SIZE MEASUREMENT USING TEMPORAL DISTRIBUTED FIBER OPTIC SENSING
    Publication number: 20210318164
    Abstract: Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) systems, methods, and structures that advantageously enable and/or facilitate the continuous, real-time monitoring and identification vehicle speed, vehicle direction, vehicle axle width, vehicle type, total number of vehicle axles, and vehicle count. The DFOS sensing fiber is advantageously positioned underneath a roadway/highway in a novel arrangement/layout and temporal measurements are made to provide vehicle identification.
    Type: Application
    Filed: April 11, 2021
    Publication date: October 14, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Sarper OZHARAR, Ting WANG
  • CONTINUOUS AERIAL CABLE MONITORING USING DISTRIBUTED ACOUSTIC SENSING (DAS) AND OPERATIONAL MODAL ANALYSIS (OMA)
    Publication number: 20210318166
    Abstract: An advance in the art is made according to aspects of the present disclosure directed to distributed fiber optic sensing systems (DFOS), methods, and structures that advantageously provide the continuous monitoring of aerial cables using distributed acoustic sensing (DAS) and operational modal analysis (OMA).
    Type: Application
    Filed: April 11, 2021
    Publication date: October 14, 2021
    Applicant: NEC Laboratories America, Inc.
    Inventors: Yangmin DING, Yue TIAN, Sarper OZHARAR, Ting WANG
  • DISTRIBUTED ACOUSTIC SENSING BASED ACOUSTIC WAVE SPEED SCANNING AND MAPPING OF CIVIL INFRASSTRUCTURES
    Publication number: 20210318165
    Abstract: Aspects of the present disclosure describe distributed fiber optic sensing (DFOS)-distributed acoustic sensing (DAS) based systems, methods, and structures that advantageously enable and/or facilitate the monitoring of civil infrastructures via acoustic wave speed measurements.
    Type: Application
    Filed: April 11, 2021
    Publication date: October 14, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Sarper OZHARAR, Yue TIAN, Yangmin DING, Ting WANG