Patents by Inventor Tatemi Ido

Tatemi Ido 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 device and optical transmission system
    Patent number: 5570439
    Abstract: An optical signal is incident on a semiconductor optical waveguide with a grating and is reflected or transmitted therethrough to thereby perform dispersion compensation. Application of an electric field or implantation of carriers can be effected in the optical waveguide by means of electrodes attached in the optical waveguide. In addition, a temperature of the optical waveguide can be varied by a resistance heater. By using these measures, the dispersion compensation wavelength and the dispersion compensation intensity can be adjusted.
    Type: Grant
    Filed: January 7, 1994
    Date of Patent: October 29, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Tatemi Ido, Hirohisa Sano