Patents by Inventor Akihito Tanji

Akihito Tanji 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 waveguide coupler having a grating electrode
    Patent number: 4645293
    Abstract: An optical coupling device comprising an electrooptical substrate, a pair of optical waveguides formed in the surface of the substrate and a grating electrode is provided. The grating electrode is so disposed to extend along one of the pair of optical waveguides at least partially. Thus, when a suitable voltage is applied to the grating electrode, a periodically changing structure of refractive index is formed within the one of the paired optical waveguides to couple the paired optical waveguides, thereby allowing to transfer a light signal from one waveguide to the other.
    Type: Grant
    Filed: January 28, 1985
    Date of Patent: February 24, 1987
    Inventors: Taizo Yoshida, Akihito Tanji, Masamitsu Masuda, Jiro Koyama