Patents by Inventor Ketan Petal

Ketan Petal 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 control using diffraction gratings in VCSEL waveguide grating couplers
    Patent number: 7627018
    Abstract: A VCSEL waveguide grating coupler is provided such that a first and second mirror are positioned to define a resonant cavity between them. The waveguide grating coupler further includes a waveguide having a first grating formed as a part of the waveguide to couple light of a first polarization mode into the waveguide. A second grating is formed on the waveguide grating coupler and is orthogonal to the first grating. The second grating is operative to enhance the light coupled to the waveguide by creating a loss difference between light of the first polarization mode and light of a second polarization mode, so that light of the first polarization mode lases preferentially within the VCSEL.
    Type: Grant
    Filed: December 26, 2007
    Date of Patent: December 1, 2009
    Assignee: Opticomp Corporation
    Inventors: Peter Guilfoyle, Duane Louderback, Ketan Petal, Sven Mahnkopf