Patents by Inventor Gengxian Luo

Gengxian Luo 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).

  • Erbium-doped fiber amplifier with automatic gain control
    Patent number: 6094298
    Abstract: An Erbium doped fiber amplifier (EDFA) is placed in a laser cavity to clamp the gain of the amplifier. The laser cavity is preferably formed to minimize the effects of relaxation oscillations and of spectral hole burning. In a preferred embodiment, the laser cavity supports a lasing wavelength which makes the saturation energy at the laser wavelength less than that at the signal wavelengths. In an erbium doped fiber implementation, the laser wavelength is shorter than that of the signal wavelengths and is separated from them by no more than approximately 75% of the width of the spectral hole. The compounding of relaxation oscillations may be substantially eliminated by varying the length of the fiber within each laser cavity within a system to change the photon round-trip time within each cavity.
    Type: Grant
    Filed: July 6, 1999
    Date of Patent: July 25, 2000
    Assignee: Lucent Technologies Inc.
    Inventors: Gengxian Luo, Atul K. Srivastava, James W. Sulhoff, Yan Sun, John L. Zyskind
  • Erbium-doped fiber amplifier with automatic gain control
    Patent number: 6008932
    Abstract: An Erbium doped fiber amplifier (EDFA) is placed in a laser cavity to clamp the gain of the amplifier. The laser cavity is preferably formed to minimize the effects of relaxation oscillations and of spectral hole burning. In a preferred embodiment, the laser cavity supports a lasing wavelength which makes the saturation energy at the laser wavelength less than that at the signal wavelengths. In an erbium doped fiber implementation, the laser wavelength is shorter than that of the signal wavelengths and is separated from them by no more than approximately 75% of the width of the spectral hole. The compounding of relaxation oscillations may be substantially eliminated by varying the length of the fiber within each laser cavity within a system to change the photon round-trip time within each cavity.
    Type: Grant
    Filed: October 7, 1997
    Date of Patent: December 28, 1999
    Assignee: Lucent Technologies Inc.
    Inventors: Gengxian Luo, Atul K. Srivastava, James W. Sulhoff, Yan Sun, John L. Zyskind