Patents by Inventor Oscar L. Alerhand

Oscar L. Alerhand 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).

  • Optoelectronic integrated circuits and method of fabricating and reducing losses using same
    Patent number: 5526449
    Abstract: An optical circuit and a method for substantially eliminating radiation losses associated with optical integrated circuits and, in particular, bends in optical waveguides, is disclosed. The circuit and waveguide are fabricated on a substrate having a periodic dielectric structure. The periodic dielectric structure exhibits a range of frequencies of electromagnetic radiation which cannot propagate into the structure. The range of frequencies is known as a photonic band gap or frequency band gap. Radiation at a frequency within the frequency band gap of the structure is confined within the circuit and waveguide by the periodic dielectric structure surrounding the circuit and waveguide. Radiation losses are substantially eliminated.
    Type: Grant
    Filed: July 14, 1994
    Date of Patent: June 11, 1996
    Assignee: Massachusetts Institute of Technology
    Inventors: Robert Meade, John Joannopoulos, Oscar L. Alerhand