Patents by Inventor Mikio Takahara

Mikio Takahara 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).

  • Method and apparatus for generating carrier suppressed optical pulse train and grating device
    Patent number: 7039260
    Abstract: A method for generating an optical pulse train includes generating a source optical pulse train having a predetermined pulse period; optically combining a plurality of uniform pitch grating waveguides having a substantially identical Bragg wavelength and ?/4-phase-shift waveguides in an alternating sequence so as to form a multiple ?/4-phase-shift grating waveguide; inputting the source optical pulse train from one end of the multiple ?/4-phase-shifted grating waveguide; and extracting reflected optical pulses by the plurality of uniform pitch grating waveguides from the one end of the multiple ?/4-phase-shifted grating waveguide.
    Type: Grant
    Filed: February 5, 2003
    Date of Patent: May 2, 2006
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Akihiko Nishiki, Masanori Hanawa, Hiroyuki Sasaki, Mikio Takahara
  • Method and apparatus for generating carrier suppressed optical pulse train and grating device
    Publication number: 20030161581
    Abstract: A method for generating an optical pulse train includes generating a source optical pulse train having a predetermined pulse period; optically combining a plurality of uniform pitch grating waveguides having a substantially identical Bragg wavelength and &lgr;/4-phase-shift waveguides in an alternating sequence so as to form a multiple &lgr;/4-phase-shift grating waveguide; inputting the source optical pulse train from one end of the multiple &lgr;/4-phase-shifted grating waveguide; and extracting reflected optical pulses by the plurality of uniform pitch grating waveguides from the one end of the multiple &lgr;/4-phase-shifted grating waveguide.
    Type: Application
    Filed: February 5, 2003
    Publication date: August 28, 2003
    Inventors: Akihiko Nishiki, Masanori Hanawa, Hiroyuki Sasaki, Mikio Takahara