Patents by Inventor A K Chu

A K Chu 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).

  • Variable optical attenuator derived from sol-gel material and manufacturing method thereof
    Patent number: 7142766
    Abstract: A variable optical attenuator and a method of manufacturing thereof are described. First, a bottom cladding is formed on a substrate. A waveguide structure having a core region and an attenuation region is subsequently formed on the bottom cladding by photolithography. A top cladding is then formed on the bottom cladding and the waveguide structure, and an electrode is next disposed thereon and is aligned above the attenuation region of the waveguide structure. Further, the waveguide structure is composed of a sol-gel material, which is obtained by mixing a solution of metal alkoxide with a solution of organically modified Si-alkoxide and heating the same.
    Type: Grant
    Filed: September 14, 2004
    Date of Patent: November 28, 2006
    Assignee: Industrial Technology Research Institute
    Inventors: Pei Tien, Guang-Way Jang, A K Chu, Jing-Yuan Lin, Ya-Hui Lin, Mei-Chih Hung