Patents by Inventor Masatsugu Togasaki

Masatsugu Togasaki 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 to control temperature of LD
    Patent number: 8611761
    Abstract: New method to control the optical transmitter is disclosed. The optical transmitter provides both of the ATC feedback loop and the APC feedback loop. When a failure occurs in the ATC feedback loop and the temperature sensor is unable to output an adequate signal any longer, the optical transmitter cuts the APC loop and operates the LD in constant conditions. The output of the monitor PD is transferred to the ATC loop to control the TEC based on the optical output of the LD.
    Type: Grant
    Filed: January 4, 2011
    Date of Patent: December 17, 2013
    Assignee: Sumitomo Electric Device Innovations, Inc.
    Inventors: Ryutaro Takei, Takeshi Irie, Tomoki Ito, Kazuhisa Ozaki, Masatsugu Togasaki
  • METHOD TO CONTROL TEMPERATURE OF LD
    Publication number: 20110164885
    Abstract: New method to control the optical transmitter is disclosed. The optical transmitter provides both of the ATC feedback loop and the APC feedback loop. When a failure occurs in the ATC feedback loop and the temperature sensor is unable to output an adequate signal any longer, the optical transmitter cuts the APC loop and operates the LD in constant conditions. The output of the monitor PD is transferred to the ATC loop to control the TEC based on the optical output of the LD.
    Type: Application
    Filed: January 4, 2011
    Publication date: July 7, 2011
    Applicant: SUMITOMO ELECTRIC DEVICE INNOVATIONS, INC.
    Inventors: Ryutaro TAKEI, Takeshi Irie, Tomoki Ito, Kazuhisa Ozaki, Masatsugu Togasaki