Patents by Inventor Hyun Kyu SHIM

Hyun Kyu SHIM 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).

  • Method and apparatus for generating optical polar return-to-zero amplitude modulation signal using reflective semiconductor optical amplifier and wavelength-division-multiplexed passive optical network system using the same
    Patent number: 9819417
    Abstract: The present invention can operate a reflective semiconductor optical amplifier at ultrahigh speed using a polar return-to-zero (RZ) modulation method, and operate a reflective semiconductor optical amplifier (RSOA) whose modulation bandwidth is limited at ultrahigh speed by generating signals vertically symmetrical using a newly suggested polar RZ signal generator when generating an amplitude modulation signal at a transmission end. The present invention can overcome the problem that a modulation speed cannot be increased to 10 Gb/s or above due to signal distortion by inter-symbol-interference when generating an ultrahigh speed amplitude modulation signal using an RSOA of low price having a very narrow modulation bandwidth in an RSOA-based optical network.
    Type: Grant
    Filed: January 12, 2016
    Date of Patent: November 14, 2017
    Assignee: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Yun Chur Chung, Hyun Kyu Shim, Hoon Kim
  • METHOD AND APPARATUS FOR GENERATING OPTICAL POLAR RETURN-to-ZERO AMPLITUDE MODULATION SIGNAL USING REFLECTIVE SEMICONDUCTOR OPTICAL AMPLIFIER AND WAVELENGTH-DIVISION-MULTIPLEXED PASSIVE OPTICAL NETWORK SYSTEM USING THE SAME
    Publication number: 20160204872
    Abstract: The present invention can operate a reflective semiconductor optical amplifier at ultrahigh speed using a polar return-to-zero (RZ) modulation method, and operate a reflective semiconductor optical amplifier (RSOA) whose modulation bandwidth is limited at ultrahigh speed by generating signals vertically symmetrical using a newly suggested polar RZ signal generator when generating an amplitude modulation signal at a transmission end. The present invention can overcome the problem that a modulation speed cannot be increased to 10 Gb/s or above due to signal distortion by inter-symbol-interference when generating an ultrahigh speed amplitude modulation signal using an RSOA of low price having a very narrow modulation bandwidth in an RSOA-based optical network.
    Type: Application
    Filed: January 12, 2016
    Publication date: July 14, 2016
    Inventors: Yun Chur CHUNG, Hyun Kyu SHIM, Hoon KIM