Patents by Inventor Yoshihiro Ogiso

Yoshihiro Ogiso 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: 10845668
    Abstract: An IQ optical modulator including: a parent Mach-Zehnder type (MZM) optical waveguide; child MZM optical waveguides constituting two arms of the parent MZM; two electrode transmission lines provided along the two arms of the child MZM, respectively, and receiving modulation signal to phase-modulate an optical signal; an RF extension line connected to the two electrode transmission lines, respectively; a first optical splitter branching light into the two arms of the parent MZM; a second optical splitter branching light into the two arms of the child MZM; and a first optical multiplexer multiplexing light from the two arms of the child MZM, wherein stripe direction of the child MZM optical waveguide is same as the RF extension line, the second optical splitter, and the first optical multiplexer, and is orthogonal to the first optical splitter.
    Type: Grant
    Filed: March 20, 2018
    Date of Patent: November 24, 2020
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yoshihiro Ogiso, Josuke Ozaki, Yuta Ueda
  • Publication number: 20200026145
    Abstract: An IQ optical modulator including: a parent Mach-Zehnder type (MZM) optical waveguide; child MZM optical waveguides constituting two arms of the parent MZM; two electrode transmission lines provided along the two arms of the child MZM, respectively, and receiving modulation signal to phase-modulate an optical signal; an RF extension line connected to the two electrode transmission lines, respectively; a first optical splitter branching light into the two arms of the parent MZM; a second optical splitter branching light into the two arms of the child MZM; and a first optical multiplexer multiplexing light from the two arms of the child MZM, wherein stripe direction of the child MZM optical waveguide is same as the RF extension line, the second optical splitter, and the first optical multiplexer, and is orthogonal to the first optical splitter.
    Type: Application
    Filed: March 20, 2018
    Publication date: January 23, 2020
    Inventors: Yoshihiro Ogiso, Josuke Ozaki, Yuta Ueda
  • Patent number: 10522892
    Abstract: This invention provides a high-frequency line adopting a structure to suppress an impedance variation and occurrence of an excessive power loss in high-frequency wiring having intersection with an optical waveguide. A high-frequency line is a microstrip line which has a basic configuration of stacking a ground electrode, a dielectric layer, and a signal electrode in this order on a SI-InP substrate. In addition, as shown in a transverse sectional view, an optical waveguide core made of InP-based semiconductor intersects with the high-frequency line in a crossing manner. A width of the signal electrode is partially increased in a certain region covering the intersection with the optical waveguide along a propagating direction of the high-frequency line. In the microstrip line, the width of the signal electrode is partially increased from w1 to w2, and characteristic impedance is thus reduced as compared to one with the uniform width w1.
    Type: Grant
    Filed: June 24, 2016
    Date of Patent: December 31, 2019
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Nobuhiro Kikuchi, Eiichi Yamada, Yoshihiro Ogiso, Josuke Ozaki
  • Patent number: 10254624
    Abstract: To provide a Mach-Zehnder (MZ) type semiconductor optical modulation element that can be used as a modulator, which is ultrafast and excellent in electrical stability. A semiconductor optical modulation element of a Mach-Zehnder type that performs modulation of light using a refractive index modulation region where a refractive index of the light guided to an optical waveguide is modulated and an input and output region where multiplexing/demultiplexing of the light split in the refractive index modulation region is performed, characterized in that in the refractive index modulation region of the optical waveguide, an n-type clad layer, an i core layer, and a p-type clad layer are stacked in the order from a top layer on a substrate surface equivalent to a (100) plane of a sphalerite-type seminsulating semiconductor crystal substrate, the n-type clad layer is formed in a ridge shape in an inverted mesa direction, and a capacitancl-oaded electrode is provided on the n-type clad layer.
    Type: Grant
    Filed: June 1, 2016
    Date of Patent: April 9, 2019
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yoshihiro Ogiso, Josuke Ozaki, Norihide Kashio, Nobuhiro Kikuchi, Masaki Kohtoku
  • Publication number: 20180175474
    Abstract: This invention provides a high-frequency line adopting a structure to suppress an impedance variation and occurrence of an excessive power loss in high-frequency wiring having intersection with an optical waveguide. A high-frequency line is a microstrip line which has a basic configuration of stacking a ground electrode, a dielectric layer, and a signal electrode in this order on a SI-InP substrate. In addition, as shown in a transverse sectional view, an optical waveguide core made of InP-based semiconductor intersects with the high-frequency line in a crossing manner. A width of the signal electrode is partially increased in a certain region covering the intersection with the optical waveguide along a propagating direction of the high-frequency line. In the microstrip line, the width of the signal electrode is partially increased from w1 to w2, and characteristic impedance is thus reduced as compared to one with the uniform width w1.
    Type: Application
    Filed: June 24, 2016
    Publication date: June 21, 2018
    Inventors: Nobuhiro Kikuchi, Eiichi Yamada, Yoshihiro Ogiso, Josuke Ozaki
  • Publication number: 20180164654
    Abstract: To provide a Mach-Zehnder (MZ) type semiconductor optical modulation element that can be used as a modulator, which is ultrafast and excellent in electrical stability. A semiconductor optical modulation element of a Mach-Zehnder type that performs modulation of light using a refractive index modulation region where a refractive index of the light guided to an optical waveguide is modulated and an input and output region where multiplexing/demultiplexing of the light split in the refractive index modulation region is performed, characterized in that in the refractive index modulation region of the optical waveguide, an n-type clad layer, an i core layer, and a p-type clad layer are stacked in the order from a top layer on a substrate surface equivalent to a (100) plane of a sphalerite-type semi-insulating semiconductor crystal substrate, the n-type clad layer is formed in a ridge shape in an inverted mesa direction, and a capacitance-loaded electrode is provided on the n-type clad layer.
    Type: Application
    Filed: June 1, 2016
    Publication date: June 14, 2018
    Inventors: Yoshihiro Ogiso, Josuke Ozaki, Norihide Kashio, Nobuhiro Kikuchi, Masaki Kohtoku
  • Patent number: 7263437
    Abstract: The invention provides a useful vehicle dispatching system. Server 60 estimates an approximate location of a passenger on the basis of the area code transmitted from server 40. Server 60 transmits a list of landmarks located in the area corresponding to the area code, and the list is thereby provided to the passenger carrying mobile station 10. The passenger selects a desired landmark to which a vehicle should be dispatched. Server 60 determines the location of the landmark by referring to the landmark database; and determines which vehicles 20 are located proximate to the landmark by referring to the vehicle database. Server 60 transmits the information on the determined vehicles 20 to mobile station 10, and the information is thereby provided to the passenger. The passenger selects a desired vehicle 20 to make a telephone call to the driver of vehicle 20. Thus, the passenger may directly talk to the driver.
    Type: Grant
    Filed: March 18, 2004
    Date of Patent: August 28, 2007
    Assignees: NTT DoCoMo, Inc., Tokyo MK Co., Ltd.
    Inventors: Masahito Hirose, Tsuyoshi Souma, Yoshihiro Ogiso, Masaaki Aoki
  • Publication number: 20040236501
    Abstract: The invention provides a useful vehicle dispatching system. Server 60 estimates an approximate location of a passenger on the basis of the area code transmitted from server 40. Server 60 transmits a list of landmarks located in the area corresponding to the area code, and the list is thereby provided to the passenger carrying mobile station 10. The passenger selects a desired landmark to which a vehicle should be dispatched. Server 60 determines the location of the landmark by referring to the landmark database; and determines which vehicles 20 are located proximate to the landmark by referring to the vehicle database. Server 60 transmits the information on the determined vehicles 20 to mobile station 10, and the information is thereby provided to the passenger. The passenger selects a desired vehicle 20 to make a telephone call to the driver of vehicle 20 of the car 20. Thus, the passenger may directly talk to the driver.
    Type: Application
    Filed: March 18, 2004
    Publication date: November 25, 2004
    Inventors: Masahito Hirose, Tsuyoshi Souma, Yoshihiro Ogiso, Masaaki Aoki