Patents by Inventor Ping-Feng HSIEH

Ping-Feng HSIEH 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).

  • Distributed feedback semiconductor laser device
    Patent number: 10916915
    Abstract: A distributed feedback (DFB) semiconductor laser device includes an active layer, a first grating layer and a second grating. The first grating layer has a first grating structure with a first grating period. The second grating layer has a second grating structure with a second grating period substantially different from the first grating period. The active layer, the first grating layer and the second grating layer are vertically stacked, and the equivalent grating period of the DFB semiconductor laser device is (2×P1×P2)/(P1+P2), where P1 and P2 respectively represent the first grating period and the second grating period.
    Type: Grant
    Filed: December 21, 2018
    Date of Patent: February 9, 2021
    Assignee: NATIONAL SUN YAT-SEN UNIVERSITY
    Inventors: Yung-Jr Hung, Yen-Chieh Wang, Ping-Feng Hsieh, Wei Lin
  • DISTRIBUTED FEEDBACK SEMICONDUCTOR LASER DEVICE
    Publication number: 20200203925
    Abstract: A distributed feedback (DFB) semiconductor laser device includes an active layer, a first grating layer and a second grating. The first grating layer has a first grating structure with a first grating period. The second grating layer has a second grating structure with a second grating period substantially different from the first grating period. The active layer, the first grating layer and the second grating layer are vertically stacked, and the equivalent grating period of the DFB semiconductor laser device is (2×P1×P2)/(P1+P2), where P1 and P2 respectively represent the first grating period and the second grating period.
    Type: Application
    Filed: December 21, 2018
    Publication date: June 25, 2020
    Inventors: Yung-Jr HUNG, Yen-Chieh WANG, Ping-Feng HSIEH