Patents by Inventor Takuya Ienaka

Takuya Ienaka 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 grating and production method therefor
    Patent number: 5949934
    Abstract: An optical waveguide grating with radiative mode-coupling properties, with exceptional stability and reliability as an optical component, wherein the central wavelength of the rejection band has a low temperature dependence, due to the use of silica glass doped with germanium and boron for the core. The rejection bandwidth can be narrowed without increasing the grating length by forming the radiative mode-coupled optical waveguide grating in an optical waveguide wherein the mean relative refractive index difference of the core is greater than that of optical communication waveguides.
    Type: Grant
    Filed: March 26, 1997
    Date of Patent: September 7, 1999
    Assignee: Fujikura, Ltd.
    Inventors: Kensuke Shima, Michihiro Nakai, Hiroshi Hidaka, Kuniharu Himeno, Satoshi Okude, Akira Wada, Masaaki Sudoh, Tetsuya Sakai, Takuya Ienaka, Ryozo Yamauchi