Patents by Inventor Yeungjoon Sohn

Yeungjoon Sohn 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).

  • Leaky surface-plasmon mode directional coupler and polarization detection module for magneto-optical pickup head using the same
    Patent number: 7899285
    Abstract: A leaky plasmon mode directional coupler and a polarization detection module for a magneto-optical pickup head, which uses the leaky plasmon mode directional coupler, are provided. The leaky plasmon mode directional coupler is manufactured by integrating a planar waveguide and a leaky plasmon mode waveguide, which share a cladding layer with each other, into one body. The polarization detection module includes the leaky plasmon mode directional coupler, a first photo diode, which is formed on the leaky plasmon mode directional coupler, and a second photo diode, which is located at an output port of the planar waveguide.
    Type: Grant
    Filed: March 4, 2004
    Date of Patent: March 1, 2011
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Yongwoo Park, Hyeon Bong Pyo, Dong Woo Suh, Yeungjoon Sohn, Hojun Ryu, Mun Cheol Paek
  • Highly efficient focusing waveguide grating coupler using leaky mode
    Patent number: 6999660
    Abstract: Provided is a focusing waveguide grating coupler using a leaky mode which can form single output beam while relieving the dependency on manufacturing processes.
    Type: Grant
    Filed: December 31, 2003
    Date of Patent: February 14, 2006
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Yongwoo Park, Yeungjoon Sohn, Mun-Cheol Paek, Dong Woo Suh, Hojun Ryu, Hyeon-Bong Pyo
  • Leaky surface-plasmon mode directional coupler and polarization detection module for magneto-optical pickup head using the same
    Publication number: 20050063644
    Abstract: A leaky plasmon mode directional coupler and a polarization detection module for a magneto-optical pickup head, which uses the leaky plasmon mode directional coupler, are provided. The leaky plasmon mode directional coupler is manufactured by integrating a planar waveguide and a leaky plasmon mode waveguide, which share a cladding layer with each other, into one body. The polarization detection module includes the leaky plasmon mode directional coupler, a first photo diode, which is formed on the leaky plasmon mode directional coupler, and a second photo diode, which is located at an output port of the planar waveguide.
    Type: Application
    Filed: March 4, 2004
    Publication date: March 24, 2005
    Inventors: Yongwoo Park, Hyeon Bong Pyo, Dong Suh, Yeungjoon Sohn, Hojun Ryu, Mun Paek
  • Highly efficient focusing waveguide grating coupler using leaky mode
    Publication number: 20050008294
    Abstract: Provided is a focusing waveguide grating coupler using a leaky mode which can form single output beam while relieving the dependency on manufacturing processes.
    Type: Application
    Filed: December 31, 2003
    Publication date: January 13, 2005
    Inventors: Yongwoo Park, Yeungjoon Sohn, Mun-Cheol Paek, Dong-Woo Suh, Hojun Ryu, Hyeon-Bong Pyo