Patents by Inventor Mark A. Koza

Mark A. Koza 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).

  • Bonded structure with portions of differing crystallographic orientations, particularly useful as a non linear optical waveguide
    Patent number: 5802232
    Abstract: A waveguide having alternating regions of different crystallographic orientations, thereby providing quasi-phase-matching for a non-linear frequency conversion, in which two wafers with epitaxial layers thereon are bonded together having different, preferably opposed, crystallographic orientations. One wafer is etched away, and a grating is etched such that one part of the grating has the orientation of one wafer and the other part has the orientation of the other wafer. Thereafter, a waveguide structure is epitaxially deposited upon the differentially oriented template so that the waveguide is differentially oriented in its axial direction. Thereby, quasi-phase-matching non-linear effects can be achieved.
    Type: Grant
    Filed: February 16, 1996
    Date of Patent: September 1, 1998
    Assignee: Bell Communications Research, Inc.
    Inventors: Rajaram Bhat, Catherine Genevieve Caneau, Mark A. Koza, Sung-Joo Yoo
  • Coherent blue/green optical source and other structures utilizing non-linear optical waveguide with quasi-phase-matching grating
    Patent number: 5796902
    Abstract: A waveguide having alternating regions of different crystallographic orientations, thereby providing quasi-phase-matching for a non-linear frequency conversion, in which two wafers with or without epitaxial layers thereon are bonded together having different, preferably opposed, crystallographic orientations. One wafer is etched away, and a grating is etched such that one part of the grating has the orientation of one wafer and the other part has the orientation of the other wafer. Thereafter, a waveguide structure is epitaxially deposited upon the differentially oriented template so that the waveguide is differentially oriented in its axial direction. Thereby, quasi-phase-matching non-linear effects can be achieved. Several important devices can thereby be achieved, including a coherent optical source using frequency doubling and a frequency converter useful in wavelength division multiplexed communication, as well as others.
    Type: Grant
    Filed: July 5, 1996
    Date of Patent: August 18, 1998
    Assignee: Bell Communications Research, Inc.
    Inventors: Rajaram Bhat, Catherine Caneau, Mark A. Koza, Sung Joo Yoo