Patents by Inventor Tsuyoshi Taniwatari

Tsuyoshi Taniwatari 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: 5852304
    Abstract: A semiconductor photonic integrated circuit and a manufacturing method thereof involving a selective-area growth technique using a set of insulating film patterning masks formed on a semiconductor substrate. The mask width and the mask-to-mask open space width are variable but numerically limited. A single crystal growth process is carried out to form on the same substrate a plurality of contiguous bulk semiconductor layers or quantum well layers differing from one another in terms of growth layer thickness or composition. The differences in energy level between these layers are utilized so that semiconductor photonic integrated devices of different functions are formed on the substrate.
    Type: Grant
    Filed: July 16, 1996
    Date of Patent: December 22, 1998
    Assignee: Hitachi, LTD.
    Inventors: Makoto Suzuki, Masahiro Aoki, Makoto Takahashi, Tsuyoshi Taniwatari
  • Patent number: 5784183
    Abstract: A semiconductor optical device fabricating method for easily fabricating on a single substrate a plurality of distributed feedback lasers or distributed Bragg reflector lasers with uniform static and dynamic properties and individually different oscillation wavelengths. A plurality of pairs of stripe type insulating thin film masks are formed over that region of the semiconductor substrate which has optical waveguides formed therein for the lasers. Each pair of stripe type masks has a constant gap therebetween. With the masks in place, optical waveguide layers for the lasers are grown in crystallized fashion through metal organic vapor epitaxy. The stripe type masks in pairs differ dimensionally from one another.
    Type: Grant
    Filed: September 4, 1996
    Date of Patent: July 21, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Masahiro Aoki, Tsuyoshi Taniwatari, Makoto Suzuki, Takayuki Tsutsui
  • Patent number: 5561682
    Abstract: A semiconductor optical device fabricating method for easily fabricating on a single substrate a plurality of distributed feedback lasers or distributed Bragg reflector lasers with uniform static and dynamic properties and individually different oscillation wavelengths. A plurality of pairs of stripe type insulating thin film masks are formed over that region of the semiconductor substrate which has optical waveguides formed therein for the lasers. Each pair of stripe type masks has a constant gap therebetween. With the masks in place, optical waveguide layers for the lasers are grown in crystallized fashion through metal organic vapor epitaxy. The stripe type masks in pairs differ dimensionally from one another.
    Type: Grant
    Filed: February 14, 1995
    Date of Patent: October 1, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Masahiro Aoki, Tsuyoshi Taniwatari, Makoto Suzuki, Takayuki Tsutsui
  • Patent number: 5543353
    Abstract: A semiconductor photonic integrated circuit and a manufacturing method thereof involving a selective-area growth technique using a set of insulating film patterning masks formed on a semiconductor substrate. The mask width and the mask-to-mask open space width are variable but numerically limited. A single crystal growth process is carried out to form on the same substrate a plurality of contiguous bulk semiconductor layers or quantum well layers differing from one another in terms of growth layer thickness or composition. The differences in energy level between these layers are utilized so that semiconductor photonic integrated devices of different functions are formed on the substrate.
    Type: Grant
    Filed: July 29, 1994
    Date of Patent: August 6, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Makoto Suzuki, Masahiro Aoki, Makoto Takahashi, Tsuyoshi Taniwatari