Patents by Inventor Yukihiko Ushiyama

Yukihiko Ushiyama 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).

  • Swept light source and method for controlling the same
    Patent number: 10205296
    Abstract: Provided is a swept light source including one end surface coupled to a wavelength filter constituted of a diffraction grating and an end mirror via a light deflector and another end surface including a gain medium facing an output coupling mirror and which configures a laser cavity between the end mirror and the output coupling mirror, wherein a drive voltage having an AC voltage on which a DC bias voltage is superimposed is output from a control voltage source of the light deflector to an electrode pair of an electro-optic crystal, light is radiated from a light emitter to the electro-optic crystal, and incident light from the gain medium incident along an optical axis perpendicular to a direction of an electric field formed by the control voltage is deflected in a direction parallel to the electric field, so that wavelength sweeping is performed.
    Type: Grant
    Filed: June 7, 2017
    Date of Patent: February 12, 2019
    Assignees: NIPPON TELEGRAPH AND TELEPHONE CORPORATION, HAMAMATSU PHOTONICS K.K., NTT Advanced Technology Corporation
    Inventors: Seiji Toyoda, Yuzo Sasaki, Takashi Sakamoto, Joji Yamaguchi, Tadashi Sakamoto, Koei Yamamoto, Masatoshi Fujimoto, Mahiro Yamada, Shogo Yagi, Yukihiko Ushiyama, Eiichi Sugai, Koji Yoneyama, Kazuo Fujiura
  • SWEPT LIGHT SOURCE AND METHOD FOR CONTROLLING THE SAME
    Publication number: 20170358899
    Abstract: Provided is a swept light source including one end surface coupled to a wavelength filter constituted of a diffraction grating and an end mirror via a light deflector and another end surface including a gain medium facing an output coupling mirror and which configures a laser cavity between the end mirror and the output coupling mirror, wherein a drive voltage having an AC voltage on which a DC bias voltage is superimposed is output from a control voltage source of the light deflector to an electrode pair of an electro-optic crystal, light is radiated from a light emitter to the electro-optic crystal, and incident light from the gain medium incident along an optical axis perpendicular to a direction of an electric field formed by the control voltage is deflected in a direction parallel to the electric field, so that wavelength sweeping is performed.
    Type: Application
    Filed: June 7, 2017
    Publication date: December 14, 2017
    Applicants: Nippon Telegraph and Telephone Corporation, Hamamatsu Photonics K.K., NTT Advanced Technology Corporation
    Inventors: Seiji TOYODA, Yuzo Sasaki, Takashi Sakamoto, Joji Yamaguchi, Tadashi Sakamoto, Koei Yamamoto, Masatoshi Fujimoto, Mahiro Yamada, Shogo Yagi, Yukihiko Ushiyama, Eiichi Sugai, Koji Yoneyama, Kazuo Fujiura