Patents by Inventor Haruyasu Ando

Haruyasu Ando 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).

  • Distortion characteristic and yield of semiconductor laser module
    Patent number: 6068411
    Abstract: A semiconductor laser module of the present invention comprises a semiconductor laser, a pig tail optical fiber, a optical part, and a transition metal doped optical fiber. The optical part optically couples the semiconductor laser and the pig tail optical fiber to each other. The transition metal doped optical fiber is formed in a length corresponding to an attenuation amount with which desired distortion characteristics and desired noise characteristics are realized, and is connected to the side of the pig tail optical fiber opposite to the side which faces the semiconductor laser. The distortion characteristics of the semiconductor laser is improved by the action of the transition metal doped optical fiber. Consequently, the yield of semiconductor laser modules is improved.
    Type: Grant
    Filed: June 9, 1998
    Date of Patent: May 30, 2000
    Assignee: NEC Corporation
    Inventor: Haruyasu Ando