Patents by Inventor Chase Changqing Wang

Chase Changqing Wang 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).

  • Optical amplifier with a spectral gain monitor using a volume phase grating
    Patent number: 6747791
    Abstract: An optical amplifier system for amplifying an input wavelength division multiplexed (WDM) optical signal with a first optical coupler to extract a portion of the power of the input signal, an erbium-doped fiber amplifier to generate an output signal and a second optical coupler to extract a portion of the power of the output signal. A spectral monitoring unit having a volume phase grating separates the extracted input and output signals into spectral components. A photo-detector array of the spectral monitoring unit determines the power level of the spectral components. The system further includes a controller operative to control the operation of the amplifier in response to the power levels of the spectral components.
    Type: Grant
    Filed: December 3, 2002
    Date of Patent: June 8, 2004
    Assignee: Bayspec, Inc.
    Inventors: William Wei Yang, Li Chen, Frank H. Levinson, Danny Deiin Yu, Charlie Shu Zhang, Chase Changqing Wang, Wilson Wenhul Liu