Patents by Inventor Yeun Chol Jung

Yeun Chol Jung 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).

  • Apparatus for monitoring optical frequencies of WDM signals
    Patent number: 7123788
    Abstract: The present invention relates to a wavelength division multiplexed (WDM) apparatus for monitoring optical frequencies, allowing optical channel frequency monitoring using the crossover property of an arrayed-waveguide grating and pilot tones that are in wide use in optical communication networks and enhancing efficiency of operation, maintenance, and management of WDM optical communication networks. The present invention provides a WDM apparatus for monitoring optical frequencies comprising optical demultiplexing means for optically demultiplexing optical signals including externally added pilot tone signals, photo-detecting means for photo-electrically converting the output of said optical demultiplexing means, and frequency estimating means for estimating the frequency of the optical signals by measuring the amplitudes of the pilot tones from the output of said photo-detecting means.
    Type: Grant
    Filed: May 6, 2002
    Date of Patent: October 17, 2006
    Assignee: Korea Advanced Institute of Science and Technology
    Inventors: Yeun Chol Jung, Cheon Joo Yoon, Seung Gyun Shin, Keun Joo Park
  • Multi-wavelength locking method and apparatus for wavelength division multiplexing (WDM) optical communication system
    Patent number: 7068949
    Abstract: Disclosed is a multi-wavelength locking method for a wavelength division multiplexing (WDM) optical communication network, and in particular, a multi-wavelength locking method and apparatus for a WDM optical communication system that can lock wavelengths of optical signals by producing pilot tones by applying a sine-wave current to a plurality of transmission lasers having different wavelengths, passing the optical signal through a Fabry-Perot etalon filter, and then Fourier-transforming the filtered optical signal.
    Type: Grant
    Filed: March 7, 2001
    Date of Patent: June 27, 2006
    Assignee: Korea Advanced Institute of Science & Technology
    Inventors: Yeun Chol Jung, Keun Joo Park, Seung Gyun Shin, Ho Chul Ji
  • Apparatus for monitoring optical frequencies of WDM signals
    Publication number: 20030206689
    Abstract: The present invention relates to a wavelength division multiplexed (WDM) apparatus for monitoring optical frequencies, allowing optical channel frequency monitoring using the crossover property of an arrayed-waveguide grating and pilot tones that are in wide use in optical communication networks and enhancing efficiency of operation, maintenance, and management of WDM optical communication networks.
    Type: Application
    Filed: May 6, 2002
    Publication date: November 6, 2003
    Inventors: Yeun Chol Jung, Cheon Joo Yoon, Seung Gyun Shin, Keun Joo Park
  • Multi-wavelength locking method and apparatus for wavelength division multiplexing (WDM) optical communication system
    Publication number: 20020048063
    Abstract: Disclosed is a multi-wavelength locking method for a wavelength division multiplexing (WDM) optical communication network, and in particular, a multi-wavelength locking method and apparatus for a WDM optical communication system that can lock wavelengths of optical signals by producing pilot tones by applying a sine-wave current to a plurality of transmission lasers having different wavelengths, passing the optical signal through a Fabry-Perot etalon filter, and then Fourier-transforming the filtered optical signal.
    Type: Application
    Filed: March 7, 2001
    Publication date: April 25, 2002
    Inventors: Yeun Chol Jung, Keon Joo Park, Seung Gyun Shin, Ho Chul Ji