Patents by Inventor Mari Ogawa

Mari Ogawa 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).

  • Self-routing optical switch and optical switch array
    Patent number: 5422967
    Abstract: There is provided a self-routing optical switch array formed by connecting m stages of optical switches and set so as to satisfy the relation:.lambda..sub.a1 <.lambda..sub.1 <.lambda..sub.a2 .lambda..sub.2 <. . . <.lambda..sub.an <.lambda..sub.n. . . <.lambda..sub.am <.lambda..sub.m <.lambda..sub.swhere .lambda..sub.n is wavelength of an absorption edge of a switching region of an nth stage of the optical switch array; .lambda..sub.an is wavelength of destination signal light multiplexed with information signal light used in an optical switch located at the nth stage, and .lambda..sub.s is wavelength of the information signal light.
    Type: Grant
    Filed: August 6, 1993
    Date of Patent: June 6, 1995
    Assignee: Hitachi, Ltd.
    Inventors: Hiroaki Inoue, Hirohisa Sano, Toshio Kirihara, Shinji Nishimura, Mari Ogawa, Koji Ishida