Patents by Inventor Kenta Takata

Kenta Takata 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).

  • Patent number: 12007530
    Abstract: Each of six first lattice elements adjacent to a light confinement portion shifts from a lattice point in a direction of separating from the light confinement portion, and each of twelve second lattice elements shifts from a lattice point in a direction of separating from the light confinement portion. The second lattice elements are lattice elements arranged to be adjacent to the first lattice elements on a side of separating from the light confinement portion. Moreover, each of the first lattice elements has a smaller diameter than other lattice elements arranged on lattice points.
    Type: Grant
    Filed: January 31, 2020
    Date of Patent: June 11, 2024
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Kenta Takata, Masaya Notomi, Akihiko Shinya, Eiichi Kuramochi, Hideaki Taniyama, Shota Kita
  • Patent number: 11799559
    Abstract: An optical IQ modulator includes: Y branching elements, which are cascade-connected, each of which has one input and two outputs; QPSK modulators configured to perform QPSK modulation on continuous light branched by the Y branching elements to generate signal light; and Y combining elements, which are cascade-connected, each of which has two inputs and one output.
    Type: Grant
    Filed: February 20, 2020
    Date of Patent: October 24, 2023
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Shota Kita, Masaya Notomi, Akihiko Shinya, Kengo Nozaki, Kenta Takata
  • Publication number: 20230093295
    Abstract: An optical IQ modulator includes Y branching elements each of which has one input and two outputs and which are cascade-connected, QQPSK modulators each of which performs QPSK modulation on a corresponding one of continuous beams of light branched by the Y branching elements so that four signal points are present in a first quadrant on an IQ plane, Y combining elements each of which has two inputs and one output and which are cascade-connected, a phase modulator that modulates output light of the Y combining element in accordance with a drive signal Z, and a phase modulator that modulates output light of the phase modulator in accordance with a drive signal W.
    Type: Application
    Filed: February 20, 2020
    Publication date: March 23, 2023
    Inventors: Shota Kita, Masaya Notomi, Akihiko Shinya, Kengo Nozaki, Kenta Takata
  • Publication number: 20230058153
    Abstract: An optical IQ modulator includes: Y branching elements, which are cascade-connected, each of which has one input and two outputs; QPSK modulators configured to perform QPSK modulation on continuous light branched by the Y branching elements to generate signal light; and Y combining elements, which are cascade-connected, each of which has two inputs and one output.
    Type: Application
    Filed: February 20, 2020
    Publication date: February 23, 2023
    Inventors: Shota Kita, Masaya Notomi, Akihiko Shinya, Kengo Nozaki, Kenta Takata
  • Patent number: 11391887
    Abstract: The amount of outward shift of a lattice element (131a) and a lattice element (131b), the outward shift being symmetrical with respect to a resonator center on a straight line, is 0.42 to 0.5 times a lattice constant of a photonic crystal. The amount of outward shift of a lattice element (132a) and a lattice element (132b), the outward shift being symmetrical with respect to the resonator center on the straight line, is 0.26 to 0.38 times the lattice constant of the photonic crystal. The amount of outward shift of a lattice element (133a) and a lattice element (133b), the outward shift being symmetrical with respect to the resonator center on the straight line, is 0.13 to 0.19 times the lattice constant of the photonic crystal. The amount of outward shift of a lattice element (134a) and a lattice element (134b), the outward shift being symmetrical with respect to the resonator center on the straight line, is ?0.1 to 0 times the lattice constant of the photonic crystal.
    Type: Grant
    Filed: July 9, 2019
    Date of Patent: July 19, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Eiichi Kuramochi, Akihiko Shinya, Masaya Notomi, Kengo Nozaki, Masato Takiguchi, Kenta Takata
  • Publication number: 20220066068
    Abstract: Each of six first lattice elements adjacent to a light confinement portion shifts from a lattice point in a direction of separating from the light confinement portion, and each of twelve second lattice elements shifts from a lattice point in a direction of separating from the light confinement portion. The second lattice elements are lattice elements arranged to be adjacent to the first lattice elements on a side of separating from the light confinement portion. Moreover, each of the first lattice elements has a smaller diameter than other lattice elements arranged on lattice points.
    Type: Application
    Filed: January 31, 2020
    Publication date: March 3, 2022
    Inventors: Kenta Takata, Masaya Notomi, Akihiko Shinya, Eiichi Kuramochi, Hideaki Taniyama, Shota Kita
  • Publication number: 20210231867
    Abstract: The amount of outward shift of a lattice element (131a) and a lattice element (131b), the outward shift being symmetrical with respect to a resonator center on a straight line, is 0.42 to 0.5 times a lattice constant of a photonic crystal. The amount of outward shift of a lattice element (132a) and a lattice element (132b), the outward shift being symmetrical with respect to the resonator center on the straight line, is 0.26 to 0.38 times the lattice constant of the photonic crystal. The amount of outward shift of a lattice element (133a) and a lattice element (133b), the outward shift being symmetrical with respect to the resonator center on the straight line, is 0.13 to 0.19 times the lattice constant of the photonic crystal. The amount of outward shift of a lattice element (134a) and a lattice element (134b), the outward shift being symmetrical with respect to the resonator center on the straight line, is ?0.1 to 0 times the lattice constant of the photonic crystal.
    Type: Application
    Filed: July 9, 2019
    Publication date: July 29, 2021
    Inventors: Eiichi Kuramochi, Akihiko Shinya, Masaya Notomi, Kengo Nozaki, Masato Takiguchi, Kenta Takata
  • Patent number: 9411026
    Abstract: This computation device and method exponentially shortens a computation time of an NP-complete problem or the like mapped into an Ising model by exponentially shortening a computation time of the Ising mode. For each pair of a plurality of slave lasers, by controlling the intensity, the polarization, and the phase of light exchanged between two slave lasers using an attenuator and a wave plate, the magnitude and the sign of pseudo Ising interaction between two slave lasers are implemented. Then, after the plurality of slave lasers arrive at a steady state, by measuring the polarization of light generated by each slave laser with left-handed circular polarization and right-handed circular polarization used as bases, a pseudo spin of each slave laser is measured.
    Type: Grant
    Filed: February 28, 2012
    Date of Patent: August 9, 2016
    Assignee: INTER-UNIVERSITY RESEARCH INSTITUTE CORPORATION, RESEARCH ORGANIZATION OF INFORMATION AND SYSTEMS
    Inventors: Yoshihisa Yamamoto, Shoko Utsunomiya, Kenta Takata, Kai Yan
  • Patent number: 9342792
    Abstract: For each pair of a plurality of slave lasers B for which injection synchronization is performed by a master laser M, by controlling the intensity of light exchanged between two slave lasers B and an optical path length between the two slave lasers B using a slave-to-laser intensity control unit IA and an inter-slave laser optical path length control unit IP, the magnitude and the sign of pseudo ising interaction Jij between the two slave lasers B are implemented. After the plurality of slave lasers B arrive at a steady state, by measuring relative values of the oscillation phases of the plurality of slave lasers B with respect to the oscillation phase of the master laser M by using an oscillation phase measuring unit PM, pseudo ising spins ?i of the plurality of slave lasers B are measured.
    Type: Grant
    Filed: November 7, 2013
    Date of Patent: May 17, 2016
    Assignees: Inter-University Research Institute Corporation, Research Organization of Information and Systems, The Board of Trustees of the Leland Stanford Junior University
    Inventors: Shoko Utsunomiya, Kenta Takata, Yoshihisa Yamamoto, Kai Wen
  • Publication number: 20140200689
    Abstract: For each pair of a plurality of slave lasers B for which injection synchronization is performed by a master laser M, by controlling the intensity of light exchanged between two slave lasers B and an optical path length between the two slave lasers B using a slave-to-laser intensity control unit IA and an inter-slave laser optical path length control unit IP, the magnitude and the sign of pseudo ising interaction Jij between the two slave lasers B are implemented. After the plurality of slave lasers B arrive at a steady state, by measuring relative values of the oscillation phases of the plurality of slave lasers B with respect to the oscillation phase of the master laser M by using an oscillation phase measuring unit PM, pseudo ising spins ?i of the plurality of slave lasers B are measured.
    Type: Application
    Filed: November 7, 2013
    Publication date: July 17, 2014
    Applicants: The Board of Trustees of the Leland Stanford Junior University, Inter-University Research Institute Corporation, Research Organization of Information and Systems
    Inventors: Shoko Utsunomiya, Kenta Takata, Yoshihisa Yamamoto, Kai Wen
  • Publication number: 20140046626
    Abstract: This computation device and method exponentially shortens a computation time of an NP-complete problem or the like mapped into an Ising model by exponentially shortening a computation time of the Ising mode. For each pair of a plurality of slave lasers, by controlling the intensity, the polarization, and the phase of light exchanged between two slave lasers using an attenuator and a wave plate, the magnitude and the sign of pseudo Ising interaction between two slave lasers are implemented. Then, after the plurality of slave lasers arrive at a steady state, by measuring the polarization of light generated by each slave laser with left-handed circular polarization and right-handed circular polarization used as bases, a pseudo spin of each slave laser is measured.
    Type: Application
    Filed: February 28, 2012
    Publication date: February 13, 2014
    Applicant: Inter-University Research Institute Corporation, Research Organization of Information Systems
    Inventors: Yoshihisa Yamamoto, Shoko Utsunomiya, Kenta Takata