Patents by Inventor Calvin Si

Calvin Si 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 and device for optical coupling
    Patent number: 6014484
    Abstract: A method and circuit is provided for more efficiently coupling light between two optical waveguides such as optical fibres. When the two waveguides are coupled to spaced apart collimating lenses such as GRIN lenses, the beam propagating between the spaced part lenses may be shifted. In this instance light can more efficiently be coupled out of the output optical fibre if it is angled with respect to the optical axis of the GRIN lens to which it is coupled. This invention provides an output fibre that is non-parallel with the optical axis of the lens it is coupled thereto.
    Type: Grant
    Filed: January 29, 1998
    Date of Patent: January 11, 2000
    Inventors: Gary S. Duck, Yihao Cheng, Calvin Si
  • Optical multiplexor/demultiplexor using a narrow band filter followed by a wideband filter
    Patent number: 5943149
    Abstract: This invention relates to an optical demultiplexor having a narrow band filter for separating a narrow band channel prior to utilizing one or more wide band filters for separating a plurality of channels into groups of channels. The groups of channels can then be further separated or demultiplexed by a plurality of narrow band filters. Advantageously, a plurality of closely spaced (i.e. 50 Ghz) channels can be separated using conventional dichroic filters.
    Type: Grant
    Filed: February 18, 1998
    Date of Patent: August 24, 1999
    Inventors: Kevin J. Cearns, Calvin Si