Patents by Inventor Kentarou KITAGAWA

Kentarou KITAGAWA 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 drive semiconductor laser diode
    Patent number: 8861559
    Abstract: A method or algorithm to control a driving current supplied to a semiconductor laser diode (LD) is disclosed. the method first prepares the look-up-table (LUT) that stores a set of parameters, ? and ?, for evaluating the modulation current Im by the equation of Im=?×Ib+?, where Ib is determined by the auto-power-control (APC) loop. In a practical operation of the LD, the APC loop determines Ib, while, Im is calculated according to the equation above by reading above two parameters corresponding to the current temperature of the LD from the LUT.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: October 14, 2014
    Assignee: Sumitomo Electric Device Innovations, Inc.
    Inventors: Fengliang Tang, Kentarou Kitagawa
  • METHOD TO DRIVE SEMICONDUCTOR LASER DIODE
    Publication number: 20120236888
    Abstract: A method or algorithm to control a driving current supplied to a semiconductor laser diode (LD) is disclosed. the method first prepares the look-up-table (LUT) that stores a set of parameters, ? and ?, for evaluating the modulation current Im by the equation of Im=?×Ib+?, where Ib is determined by the auto-power-control (APC) loop. In a practical operation of the LD, the APC loop determines Ib, while, Im is calculated according to the equation above by reading above two parameters corresponding to the current temperature of the LD from the LUT.
    Type: Application
    Filed: March 29, 2012
    Publication date: September 20, 2012
    Applicant: Sumitomo Electric Device Innovations, Inc.
    Inventors: Fengliang TANG, Kentarou KITAGAWA