Patents by Inventor Masashi Shimo

Masashi Shimo 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).

  • Polarization-independent optical isolator
    Patent number: 5848203
    Abstract: An optical isolator for preventing reflection-returned light from entering back into the emitter of an optical system such as an optical fiber communication or an optical disc input/output device, using semiconductor laser. The polarization-independent optical isolator includes a light-emitting side optical fiber having a diameter of a core expanded to give a mode field diameter at an end face of 20 to 50 .mu.m, a light-incident side optical fiber having a diameter of a core expanded to give a mode field diameter at an end face of 20 to 50 .mu.
    Type: Grant
    Filed: February 4, 1997
    Date of Patent: December 8, 1998
    Assignees: Sumitomo Osaka Cement Co., Ltd., Shojiro Kawakami, Kazuo Shiraishi
    Inventors: Shojiro Kawakami, Kazuo Shiraishi, Masashi Shimo