Patents by Inventor Kouji TAKEGUCHI

Kouji TAKEGUCHI 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 output module, optical transceiver, and optical transmission system
    Patent number: 8909067
    Abstract: The I phase modulator modulates a phase based on the bias voltage in which a first modulation signal and a first pilot signal are inherent and the Q phase modulator modulates a phase based on the bias voltage in which a second pilot signal different from the first pilot signal and a second modulation signal are inherent. A time-average power synchronous detection unit detects an optical power at a timing at which the positivity and negativity of the voltages of both pilot signals become the same, and an optical power when the positivity and negativity of the voltages of both pilot signals are opposite. The bias voltage control unit controls the bias voltage so that the difference between both the optical powers becomes small based on the detection result of the time-average power synchronous detection unit.
    Type: Grant
    Filed: May 14, 2012
    Date of Patent: December 9, 2014
    Assignee: Oclaro Japan, Inc.
    Inventors: Kouji Takeguchi, Shigehiro Takashima, Taichi Kogure, Hirofumi Nakagawa, Saki Narisawa
  • OPTICAL OUTPUT MODULE, OPTICAL TRANSCEIVER, AND OPTICAL TRANSMISSION SYSTEM
    Publication number: 20120301153
    Abstract: The I phase modulator modulates a phase based on the bias voltage in which a first modulation signal and a first pilot signal are inherent and the Q phase modulator modulates a phase based on the bias voltage in which a second pilot signal different from the first pilot signal and a second modulation signal are inherent. A time-average power synchronous detection unit detects an optical power at a timing at which the positivity and negativity of the voltages of both pilot signals become the same, and an optical power when the positivity and negativity of the voltages of both pilot signals are opposite. The bias voltage control unit controls the bias voltage so that the difference between both the optical powers becomes small based on the detection result of the time-average power synchronous detection unit.
    Type: Application
    Filed: May 14, 2012
    Publication date: November 29, 2012
    Applicant: OPNEXT JAPAN, INC.
    Inventors: Kouji TAKEGUCHI, Shigehiro TAKASHIMA, Taichi KOGURE, Hirofumi NAKAGAWA, Saki NARISAWA