Patents by Inventor Yoshiaki Ohtsuka

Yoshiaki Ohtsuka 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).

  • Filter processing system for the output signal of optical time domain reflectometer in the chromatic dispersion distribution measurement apparatus
    Patent number: 6882410
    Abstract: A filter processing system making it possible to be able to set a frequency pass-band automatically and to provide the optimum filter to an input signal. A filter processing method of an output signal of an Optical Time Domain Reflectometer (OTDR) in a chromatic dispersion distribution measuring apparatus is disclosed. The filter processing method includes establishing measuring-condition parameters, generating an ideal signal waveform based on previously established chromatic dispersion values and the measuring-condition parameters, and providing correlation results between the ideal signal waveform and a filter input signal. The method also includes comparing the correlation results to a threshold value to generate a minimum chromatic dispersion value and a maximum chromatic dispersion value, and performing filter processing for the output of the OTDR based on the minimum chromatic dispersion value and the maximum chromatic dispersion value.
    Type: Grant
    Filed: January 16, 2003
    Date of Patent: April 19, 2005
    Assignees: Ando Electric Co., Ltd., Kyusyu Ando Electric Company Limited
    Inventors: Yoshimitsu Asahina, Takao Suzuki, Shoichi Aoki, Yoshiaki Ohtsuka
  • Filter processing system for the output signal of optical time domain reflectometer in the chromatic dispersion distribution measurement apparatus
    Publication number: 20030234922
    Abstract: A filter processing system making it possible to be able to set a frequency pass-band automatically and always provides the optimum filter to an input signal.
    Type: Application
    Filed: January 16, 2003
    Publication date: December 25, 2003
    Inventors: Yoshimitsu Asahina, Takao Suzuki, Shoichi Aoki, Yoshiaki Ohtsuka