Patents by Inventor Philip Ji

Philip Ji has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20220230539
    Abstract: Aspects of the present disclosure describe DFOS systems, methods, and structures that advantageously extract road traffic from DFOS vibration patterns such that anomaly detection is possible. Sensed vibration data is represented accurately as a set of points, where each point is denoted as a tuple with elements indicating a time stamp, a location along a length of a DFOS optical sensing cable, and vibration strength detected at the location at the time. Traffic pattern detection is based on a progressive probabilistic Hough transform (PPHT) that exploits global information from an entire spatial-temporal data snapshot to assess a cause of detected vibrations.
    Type: Application
    Filed: January 13, 2022
    Publication date: July 21, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Shaobo HAN, Ming-Fang HUANG, Philip JI, Yueheng CHEN, Milad SALEMI
  • Patent number: 11391622
    Abstract: An optical fiber sensing system with reduced spatial resolution and noise for multiple applications and method of operating same that employs a coherent receiver configured to detect and digitize both I and Q signals in two polarizations and performs signal beating in a digital signal processor (DSP) using the polarization-diverse signals to obtain beating results for multiple polarization state pairs that effectively reduces polarization induced fading effect(s) while providing faster sensing speed(s) and more efficient filtering. Since Rayleigh signals are captured in two orthogonal polarizations, four beating products are determined at once in the DSP and all are used for fiber strain determination thereby avoiding polarization fading.
    Type: Grant
    Filed: February 5, 2020
    Date of Patent: July 19, 2022
    Inventors: Ezra Ip, Yue-Kai Huang, Junqiang Hu, Philip Ji, Shuji Murakami, Yaowen Li
  • Patent number: 11387898
    Abstract: Aspects of the present disclosure describe optical fiber sensing systems, methods and structures disclosing a distributed optical fiber sensor network constructed on a switched optical fiber telecommunications infrastructure to detect temperatures, acoustic effects, and vehicle traffic—among others—demonstrated with a number of different network topologies.
    Type: Grant
    Filed: September 28, 2020
    Date of Patent: July 12, 2022
    Inventors: Ting Wang, Ming-Fang Huang, Yaowen Li, Philip Ji
  • 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: 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: 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
  • Patent number: 11204286
    Abstract: Aspects of the present disclosure describe single mode fiber distributed temperature sensing (DTS) with improved noise characteristics employing superluminescent emitting diodes (SLEDs) and/or amplified spontaneous emission (ASE) light sources.
    Type: Grant
    Filed: May 21, 2020
    Date of Patent: December 21, 2021
    Inventors: Yaowen Li, Ming-Fang Huang, Shuji Murakami, Philip Ji, Ting Wang
  • 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
  • Publication number: 20210312801
    Abstract: Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) systems, methods, and structures that advantageously provide traffic monitoring. and traffic management which improves the safety and efficiency of a roadway.
    Type: Application
    Filed: April 4, 2021
    Publication date: October 7, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Philip JI, Eric COSATTO, Ting WANG
  • Publication number: 20210266065
    Abstract: Aspects of the present disclosure describe optical fiber sensing systems, methods and structures disclosing a distributed optical fiber sensor network constructed on a switched optical fiber telecommunications infrastructure to detect temperatures, acoustic effects, and vehicle traffic—among others—demonstrated with a number of different network topologies.
    Type: Application
    Filed: September 28, 2020
    Publication date: August 26, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Ting WANG, Ming-Fang HUANG, Yaowen LI, Philip JI
  • Publication number: 20210199512
    Abstract: Aspects of the present disclosure describe single mode fiber distributed temperature sensing (DTS) with improved noise characteristics employing superluminescent emitting diodes (SLEDs) and/or amplified spontaneous emission (ASE) light sources.
    Type: Application
    Filed: May 21, 2020
    Publication date: July 1, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Yaowen LI, Ming-Fang HUANG, Shuji MURAKAMI, Philip JI, Ting WANG
  • Publication number: 20210133512
    Abstract: Aspects of the present disclosure describe systems, methods, and structures for the machine learning based regression of complex coefficients of a linear combination of spatial modes from a multimode optical fiber.
    Type: Application
    Filed: October 27, 2020
    Publication date: May 6, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Giovanni MILIONE, Philip JI, Eric COSATTO
  • Patent number: 10931366
    Abstract: Aspects of the present disclosure describe optical fiber sensing systems, methods and structures disclosing a distributed fiber sensor network constructed on an existing, live network, data carrying, optical fiber telecommunications infrastructure to detect temperatures, acoustic effects, and vehicle traffic—among others. Of particular significance, sensing systems, methods, and structures according to aspects of the present disclosure may advantageously identify specific network locations relative to manholes/handholes and environmental conditions within those manholes/handholes namely, normal, flooded, frozen/iced, etc.
    Type: Grant
    Filed: March 25, 2020
    Date of Patent: February 23, 2021
    Assignees: VERIZON PATENT AND LICENSING INC.
    Inventors: Ting Wang, Ming-Fang Huang, Tiejun Xia, Glenn Wellbrock, Yaowen Li, Philip Ji
  • Publication number: 20200313763
    Abstract: Aspects of the present disclosure describe optical fiber sensing systems, methods and structures disclosing a distributed fiber sensor network constructed on an existing, live network, data carrying, optical fiber telecommunications infrastructure to detect temperatures, acoustic effects, and vehicle traffic—among others. Of particular significance, sensing systems, methods, and structures according to aspects of the present disclosure may advantageously identify specific network locations relative to manholes/handholes and environmental conditions within those manholes/handholes namely, normal, flooded, frozen/iced, etc.
    Type: Application
    Filed: March 25, 2020
    Publication date: October 1, 2020
    Applicants: NEC LABORATORIES AMERICA, INC, VERIZON PATENT AND LICENSING INC.
    Inventors: Ting WANG, Ming-Fang HUANG, Tiejun XIA, Glenn WELLBROCK, Yaowen LI, Philip JI
  • Patent number: 10763989
    Abstract: Aspects of the present disclosure describe systems, methods and structures for classification of higher-order spatial modes using machine learning systems and methods in which the classification of high-order spatial modes emitted from a multimode optical fiber does not require indirect measurement of the complex amplitude of a light beam's electric field using interferometry or, holographic techniques via unconventional optical devices/elements, which have prohibitive cost and efficacy; classification of high-order spatial modes emitted from a multimode optical fiber is not dependent on a light beam's alignment, size, wave front (e.g. curvature, etc.
    Type: Grant
    Filed: October 16, 2019
    Date of Patent: September 1, 2020
    Assignee: NEC Corporation
    Inventors: Giovanni Milione, Philip Ji, Eric Cosatto
  • Publication number: 20200249076
    Abstract: Aspects of the present disclosure describe optical fiber sensing systems, methods and structures and application employing coherent detection of backscattered signals.
    Type: Application
    Filed: February 5, 2020
    Publication date: August 6, 2020
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Ezra IP, Yue-Kai HUANG, Junqiang HU, Philip JI, Shuji MURAKAMI, Yaowen LI
  • Publication number: 20200119830
    Abstract: Aspects of the present disclosure describe systems, methods and structures for classification of higher-order spatial modes using machine learning systems and methods in which the classification of high-order spatial modes emitted from a multimode optical fiber does not require indirect measurement of the complex amplitude of a light beam's electric field using interferometry or, holographic techniques via unconventional optical devices/elements, which have prohibitive cost and efficacy; classification of high-order spatial modes emitted from a multimode optical fiber is not dependent on a light beam's alignment, size, wave front (e.g. curvature, etc.
    Type: Application
    Filed: October 16, 2019
    Publication date: April 16, 2020
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Giovanni MILIONE, Philip JI, Eric COSATTO
  • Patent number: 10404398
    Abstract: Aspects of the present disclosure describe systems, methods, and structures for passive optical add/drop multiplexing (POADM) architectures that remove the prior art requirement of an optical amplifier (i.e., repeater-less) at the POADM nodes.
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: September 3, 2019
    Assignee: NEC CORPORATION
    Inventors: Ezra Ip, Yue-Kai Huang, Shuji Murakami, Philip Ji
  • Publication number: 20180262293
    Abstract: Aspects of the present disclosure describe systems, methods, and structures for passive optical add/drop multiplexing (POADM) architectures that remove the prior art requirement of an optical amplifier (i.e., repeater-less) at the POADM nodes.
    Type: Application
    Filed: March 6, 2018
    Publication date: September 13, 2018
    Applicant: NEC LABORATORIES AMERICA, INC.
    Inventors: Ezra Ip, Yue-Kai Huang, Shuji Murakami, Philip Ji
  • Patent number: 9925570
    Abstract: An open path optical sensing system having an ultrasonic cleaner. The system includes at least one ultrasound transducer which is configured to propagate ultrasonic waves across exposed surfaces of optical components of the optical sensing system. The ultrasonic waves create tiny vibrations on the exposed surfaces of the optical components which clean the surfaces of environmental pollutants and prevent environmental pollutants from accumulating on the surface. The ultrasonic waves may have a frequency that is substantially different than the modulation frequency of a modulated laser light beam that is generated by a laser of the open path optical sensing system. The surfaces of a plurality of optical components may be cleaned by the ultrasonic waves of a single ultrasound transducer. A plurality of ultrasound transducers may propagate waves on a single optical component.
    Type: Grant
    Filed: November 23, 2015
    Date of Patent: March 27, 2018
    Assignee: NEC Corporation
    Inventors: Philip Ji, Ting Wang