Patents by Inventor Young Bae Yeo

Young Bae Yeo 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).

  • Patent number: 6377351
    Abstract: A fiber-optic laser gyroscope having phase sensitive detecting means which can reduce rotation rate measurement errors. In the fiber-optic laser gyroscope, errors due to the relative intensity difference between two consecutive pulses, which was an error factor in rotation rate measurement through time interval measurement between two adjacent pulses, can be eliminated by having a phase sensitive detection means which may extract and detect only components having the same phase as that of a phase-modulated signal from components having the same frequency as that of a phase-modulated signal. An output from the phase sensitive detecting means has an additional characteristic of being linearly proportional to rotation rate. The fiber-optic laser gyroscope of the present invention, therefore, has a characteristic of a relatively simple signal processing compared to conventional interferometric fiber gyroscopes.
    Type: Grant
    Filed: November 4, 1999
    Date of Patent: April 23, 2002
    Assignee: Korea Advanced Institute of Science and Technology
    Inventors: Byoung Yoon Kim, Jong Bum Hong, Young Bae Yeo, Bong Wan Lee
  • Patent number: 6266456
    Abstract: An optical fiber polarization scrambler decreasing the degree of polarization (DOP) of light efficiently using at least two optical fiber birefringence modulators (10, 11) and an operating parameter input method for the same. Birefringence modulators are constructed with hollow cylindrical piezo devices (10, 11) and a strand of optical fiber (30) wound continuously on the outer walls of the piezo devices (10, 11). An angle between the birefringence modulators consisting of the optical fiber polarization scrambler is configured to compensate the effect of circular birefringence. A method for exactly configuring birefringence modulation frequency and birefringence modulation amplitude to achieve effective polarization scrambling for the optical fiber polarization scrambler is also provided.
    Type: Grant
    Filed: October 19, 1999
    Date of Patent: July 24, 2001
    Assignee: Donam Systems Inc.
    Inventors: Bong Wan Lee, Yeon Wan Koh, Young Bae Yeo, Byoung Yoon Kim
  • Patent number: 6233371
    Abstract: An optical fiber polarization controller which has compact size by employing wave plates made of short sections of a first optical fiber having inherent birefringence such as a polarization maintaining optical fiber. In the control of the polarization state of input light, a second optical fiber, for example a single mode fiber, connected to the first optical fiber is twisted using fixing knobs, thereby rotating the birefringence axis of the first optical fiber with respect to the second optical fiber.
    Type: Grant
    Filed: January 15, 1999
    Date of Patent: May 15, 2001
    Assignee: Donam Systems Inc.
    Inventors: Byoung Yoon Kim, Yeon Wan Koh, Young Kie Kim, Young Bae Yeo