Patents by Inventor Toshimi Kominato

Toshimi Kominato 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).

  • Y branch circuit and method for manufacturing the same
    Patent number: 7499613
    Abstract: A Y branch circuit according to the present invention includes; a under clad; a circuit core, formed on the under clad and having a main core and two branch cores, connected to the main core, and an over clad that embeds the circuit core. The main core and the two branch cores are connected across an interval. The two branch cores have a width-to-height ratio of 50% to 150% and have a gap, at the main core end, that is narrower at the over clad side than at the under clad side.
    Type: Grant
    Filed: June 5, 2006
    Date of Patent: March 3, 2009
    Assignee: NTT Electronics Corporation
    Inventors: Yasuhiro Hida, Toshimi Kominato, Yasuyuki Inoue, Norio Takato, Yasumori Ohmura
  • Y branch circuit and method for manufacturing the same
    Publication number: 20060278960
    Abstract: A Y branch circuit according to the present invention includes; a under clad; a circuit core, formed on the under clad and having a main core and two branch cores, connected to the main core, and an over clad that embeds the circuit core. The main core and the two branch cores are connected across an interval. The two branch cores have a width-to-height ratio of 50% to 150% and have a gap, at the main core end, that is narrower at the over clad side than at the under clad side.
    Type: Application
    Filed: June 5, 2006
    Publication date: December 14, 2006
    Applicants: Nippon Telegraph and Telephone Corporation, NTT Electronics Corporation
    Inventors: Yasuhiro Hida, Toshimi Kominato, Yasuyuki Inoue, Norio Takato, Yasumori Ohmura
  • Optical waveguide circuit
    Patent number: 6580862
    Abstract: An optical waveguide circuit is provided that can reduce or eliminate polarization dependence by reducing or eliminating birefringence. A substrate consists of a silicon substrate, and a cladding and a core are composed of silica-based glass. The core has a multilayer structure composed of a few types of layers with different refractive indices such as first core layers and second core layers stacked in the direction parallel to the substrate. As for the birefringence of the waveguide, the geometrical birefringence caused by the multilayer structure is canceled out by the other birefringence, thereby being able to reduce or eliminate the birefringence of the waveguide.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: June 17, 2003
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Toshimi Kominato, Akio Sugita, Mikitaka Itoh, Yasuyuki Inoue, Yasuhiro Hida
  • Optical waveguide circuit
    Publication number: 20020122650
    Abstract: An optical waveguide circuit is provided that can reduce or eliminate polarization dependence by reducing or eliminating birefringence. A substrate consists of a silicon substrate, and a cladding and a core are composed of silica-based glass. The core has a multilayer structure composed of a few types of layers with different refractive indices such as first core layers and second core layers stacked in the direction parallel to the substrate. As for the birefringence of the waveguide, the geometrical birefringence caused by the multilayer structure is canceled out by the other birefringence, thereby being able to reduce or eliminate the birefringence of the waveguide.
    Type: Application
    Filed: December 21, 2001
    Publication date: September 5, 2002
    Inventors: Toshimi Kominato, Akio Sugita, Mikitaka Itoh, Yasuyuki Inoue, Yasuhiro Hida