Patents by Inventor Helege E. Engan

Helege E. Engan 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).

  • Fiber optic inter-mode coupling single side band frequency shifter
    Patent number: 4832437
    Abstract: An optical fiber is subjected to a series of traveling flexural waves propagating along a length of the fiber. At least a portion of an optical signal propagating within the optical fiber in a first propagation mode is coupled to a second propagation mode. The optical signal in the second propagation mode has a frequency which is equal to either the sum of or the difference between the frequency of the optical signal in the first propagation mode and the frequency of the traveling flexural waves.
    Type: Grant
    Filed: May 11, 1987
    Date of Patent: May 23, 1989
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Byoung Y. Kim, Herbert J. Shaw, Helege E. Engan, James N. Blake