Patents by Inventor Dan Dapkus

Dan Dapkus 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 apparatus for narrow bandwidth distributed bragg reflector semiconductor lasers
    Patent number: 6611544
    Abstract: Semiconductor lasers having a narrow bandwidth distributed Bragg reflector (DBR). The narrow bandwidth distributed Bragg reflector reflects photons over a narrow wavelength range for amplification within the laser cavity. Photons outside the narrow wavelength range are not reflected back into the laser cavity and are therefore not amplified. The narrow bandwidth distributed Bragg reflector can be formed of semiconductor materials or dielectric materials. The narrow bandwidth distributed Bragg reflector is included as part of folded cavity surface emitting lasers and edge emitting lasers. Photons within the narrow wavelength range of the narrow bandwidth distributed Bragg reflector reflects are of a relatively long wavelength to improve efficiency of communication over fiber optic cables.
    Type: Grant
    Filed: April 11, 2000
    Date of Patent: August 26, 2003
    Assignee: E20 Communications, Inc.
    Inventors: Wenbin Jiang, Dan Dapkus, Hsing-Chung Lee