Patents by Inventor Yuji Hayami

Yuji Hayami 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 90-degree hybrid circuit and optical receiver using same
    Patent number: 9800349
    Abstract: An object of the present invention is to provide an optical 90-degree hybrid circuit which is capable of easily adjusting the optical power ratio between signal and local oscillator and suppresses an optical system of an optical receiver becoming complex and optical receivers using the same.
    Type: Grant
    Filed: March 28, 2013
    Date of Patent: October 24, 2017
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Yuji Hayami, Toshio Kataoka
  • OPTICAL 90-DEGREE HYBRID CIRCUIT AND OPTICAL RECEIVER USING SAME
    Publication number: 20150063810
    Abstract: An object of the present invention is to provide an optical 90-degree hybrid circuit which is capable of easily adjusting the optical power ratio between signal and local oscillator and suppresses an optical system of an optical receiver becoming complex and optical receivers using the same.
    Type: Application
    Filed: March 28, 2013
    Publication date: March 5, 2015
    Inventors: Yuji Hayami, Toshio Kataoka