Patents by Inventor Ronggui Shen

Ronggui Shen 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).

  • Miniature variable attenuator
    Patent number: 6606446
    Abstract: An improved optic attenuator controllably filters an optical signal after the signal has been expanded and collimated. The optical signals are preferably expanded and refocused by a single GRIN lens, the signal passing through a variable filter between the GRIN lens and a reflector, and again between the reflector and the GRIN lens. Both the input and output fibers can be held within a single sleeve in alignment with the GRIN lens. The amount of attenuation can be indicated by a potentiometer.
    Type: Grant
    Filed: June 30, 1997
    Date of Patent: August 12, 2003
    Assignee: JDS Uniphase Corporation
    Inventors: Ronggui Shen, Jingyu Xu, Jing-Jong Pan
  • Miniature variable optical attenuator
    Patent number: 6130984
    Abstract: A variable optical attenuator controllably filters an optical signal after the signal has been expanded and collimated. The optical signals are optionally expanded and refocused by a single GRIN lens, the signal passing through a variable filter between the GRIN lens and a reflector, and again between the reflector and the GRIN lens. Both the input and output fibers can be held within a single sleeve in alignment with the GRIN lens. Alternatively, separate input and output GRIN lenses may be used. The amount of attenuation can be indicated by a potentiometer.
    Type: Grant
    Filed: March 4, 1998
    Date of Patent: October 10, 2000
    Assignee: E-Tek Dynamics, Inc.
    Inventors: Ronggui Shen, Jingyu Xu, Jing-Jong Pan