Patents by Inventor Wonk Seok Han

Wonk Seok Han 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 Bragg reflector (DBR) structure in vertical cavity surface emitting laser (VCSEL) diode, method on manufacturing the same, and VCSEL diode
    Publication number: 20070127535
    Abstract: A DBR structure in a VCSEL diode, a method of manufacturing the DBR structure, and a VCSEL diode are provided. The DBR structure in the VCSEL diode includes: an InAlGaAs layer having a predetermined refractive index and disposed on an InP substrate; a first InAlAs layer having a lower refractive index than the InAlGaAs layer and disposed on the InAlGaAs layer; an InP layer having a lower refractive index than the InAlGaAs layer and disposed on the first InAlAs layer; and a second InAlAs layer having a lower refractive index than the InAlGaAs layer and disposed on the InP layer. Thus, the DBR structure can reduce optical loss due to type-II band line-up at a junction between the InAlGaAs layer and the InP layer, and thus improve device characteristics.
    Type: Application
    Filed: October 5, 2006
    Publication date: June 7, 2007
    Inventors: Ki Soo Kim, Wonk Seok Han, Sung Bock Kim, Dae Kon Oh