Patents by Inventor Jyun-ichi Takahashi

Jyun-ichi Takahashi 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).

  • Optical module and manufacturing method therefor
    Patent number: 7076135
    Abstract: An optical module includes an under cladding, a first core, a second core, and an over cladding. The under cladding has a flat shape as a whole. The first core has a quadrangular cross section and is placed on the under cladding. The second core is placed on a terminal end portion of the first core. The over cladding is placed in a region including the terminal end portion of the first core and the second core placed on the terminal end portion of the first core. The under cladding and the first core placed thereon constitute a first optical waveguide. The under cladding, the terminal end portion of the first core placed on the under cladding, the second core placed thereon, and the over cladding placed on and around the second core constitute a mode field size conversion portion. The under cladding, the second core placed on the under cladding, and the over cladding placed on and around the second core constitute a second optical waveguide. The first core is made of silicon.
    Type: Grant
    Filed: September 18, 2003
    Date of Patent: July 11, 2006
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Koji Yamada, Tai Tsuchizawa, Shingo Uchiyama, Tetsufumi Shoji, Jyun-ichi Takahashi, Toshifumi Watanabe, Emi Tamechika, Hirofumi Morita
  • Optical module and manufacturing method therefor
    Publication number: 20040057667
    Abstract: An optical module includes an under cladding, a first core, a second core, and an over cladding. The under cladding has a flat shape as a whole. The first core has a quadrangular cross section and is placed on the under cladding. The second core is placed on a terminal end portion of the first core. The over cladding is placed in a region including the terminal end portion of the first core and the second core placed on the terminal end portion of the first core. The under cladding and the first core placed thereon constitute a first optical waveguide. The under cladding, the terminal end portion of the first core placed on the under cladding, the second core placed thereon, and the over cladding placed on and around the second core constitute a mode field size conversion portion. The under cladding, the second core placed on the under cladding, and the over cladding placed on and around the second core constitute a second optical waveguide. The first core is made of silicon.
    Type: Application
    Filed: September 18, 2003
    Publication date: March 25, 2004
    Inventors: Koji Yamada, Tai Tsuchizawa, Shingo Uchiyama, Tetsufumi Shoji, Jyun-Ichi Takahashi, Toshifumi Watanabe, Emi Tamechika, Hirofumi Morita