Patents by Inventor Edwin Pun

Edwin Pun 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 for fabricating buried ion-exchanged waveguides using field-assisted annealing
    Publication number: 20060260364
    Abstract: A method for forming buried ion-exchanged waveguides involves a two-step process. In a first step a waveguide is formed at the surface of a substrate using an ion-exchange technique. After formation of the waveguide, a field-assisted annealing is carried out to move the waveguide away from the surface of the substrate so that it is buried in the substrate. Exemplary field-assisted annealing is carried out at a temperature close to the ion-exchange temperature ±10° C. to optimize results.
    Type: Application
    Filed: May 18, 2005
    Publication date: November 23, 2006
    Applicant: City University of Hong Kong
    Inventors: Edwin Pun, Ke Liu
  • Doped polymeric optical waveguide amplifiers
    Publication number: 20060152797
    Abstract: A polymer-based optical waveguide amplifier comprises a polymer host material doped with rare earth ions wherein the polymer host material is a material that functions as a resist in a direct patterning technique. The polymer host material can be epoxy novalac resin doped with Er3+ ions and Yb3+ ions, and the direct patterning comprises electron beam direct writing or UV printing.
    Type: Application
    Filed: January 11, 2005
    Publication date: July 13, 2006
    Applicant: City University of Hong Kong
    Inventors: Edwin Pun, Wing Wong