Patents by Inventor Shoji Kakehashi

Shoji Kakehashi 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 waveband demultiplexer, optical waveband multiplexer, and optical waveband selective switch
    Patent number: 8244133
    Abstract: A simple optical waveband multiplexer/demultiplexer operable to separate a wavelength-division multiplexed light beam WDM consisting of a plurality of wavebands WB each including a plurality of optical channels, into a predetermined plurality of wavebands WB, and output the separated plurality of wavebands WB from a plurality of output ports, wherein the wavelength-division multiplexed light beam WDM is transmitted through two array waveguides each capable of performing a demultiplexing function with a resolution corresponding to wavelengths of the optical channels, and a characteristic of sequentially shifting the output ports by one position with shifting of input ports by one position, whereby the wavelength-division multiplexed light beam WDM is separated into a plurality of wavebands WB each including the mutually different optical channels selected from the optical channels included in the wavelength-division multiplexed light beam WDM, and the separated wavebands WB are outputted from the plurality of
    Type: Grant
    Filed: April 18, 2007
    Date of Patent: August 14, 2012
    Assignees: National University Corporation, Nippon Telegraph and Telephone Corporation
    Inventors: Ken-ichi Sato, Hiroshi Hasegawa, Shoji Kakehashi, Osamu Moriwaki, Shin Kamei, Kenya Suzuki, Yoshihisa Sakai, Kouichi Takiguchi
  • Optical Waveband Demultiplexer, Optical Waveband Multiplexer, and Optical Waveband Selective Switch
    Publication number: 20090220234
    Abstract: A simple optical waveband multiplexer/demultiplexer operable to separate a wavelength-division multiplexed light beam WDM consisting of a plurality of wavebands WB each including a plurality of optical channels, into a predetermined plurality of wavebands WB, and output the separated plurality of wavebands WB from a plurality of output ports, wherein the wavelength-division multiplexed light beam WDM is transmitted through two array waveguides each capable of performing a demultiplexing function with a resolution corresponding to wavelengths of the optical channels, and a characteristic of sequentially shifting the output ports by one position with shifting of input ports by one position, whereby the wavelength-division multiplexed light beam WDM is separated into a plurality of wavebands WB each including the mutually different optical channels selected from the optical channels included in the wavelength-division multiplexed light beam WDM, and the separated wavebands WB are outputted from the plurality of
    Type: Application
    Filed: April 18, 2007
    Publication date: September 3, 2009
    Applicants: NATIONAL UNIVERSITY CORPORATION NAGOYA UNIVERSITY, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ken-ichi Sato, Hiroshi Hasegawa, Shoji Kakehashi, Osamu Moriwaki, Shin Kamel, Kenya Suzuki, Yoshihisa Sakai, Kouichi Takiguchi