Patents by Inventor Changqiao LIU

Changqiao LIU 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).

  • Frequency chirp correction method for photonic time-stretch system
    Patent number: 10979143
    Abstract: A frequency chirp correction method for the photonic time-stretch system comprises acquiring the stretching signal, i.e. acquiring the time-domain data after the time-domain stretching. First, the time-domain data of the stretching signal is Fourier transformed to obtain the spectral distribution. The spectral distribution is then convoluted with the first frequency-domain correction factor, and then multiplied with the second frequency-domain correction factor to obtain the modified frequency spectrum. Finally, the modified frequency spectrum is performed by the inverse Fourier transform to obtain the time-domain signal after the frequency chirp correction.
    Type: Grant
    Filed: February 13, 2020
    Date of Patent: April 13, 2021
    Assignee: ZHEJIANG UNIVERSITY
    Inventors: Changqiao Liu, Xiaofeng Jin, Xianbin Yu, Xiangdong Jin, Xianmin Zhang, Shilie Zheng, Qinggui Tan, Bo Cong
  • FREQUENCY CHIRP CORRECTION METHOD FOR PHOTONIC TIME-STRETCH SYSTEM
    Publication number: 20200274616
    Abstract: A frequency chirp correction method for the photonic time-stretch system comprises acquiring the stretching signal, i.e. acquiring the time-domain data after the time-domain stretching. First, the time-domain data of the stretching signal is Fourier transformed to obtain the spectral distribution. The spectral distribution is then convoluted with the first frequency-domain correction factor, and then multiplied with the second frequency-domain correction factor to obtain the modified frequency spectrum. Finally, the modified frequency spectrum is performed by the inverse Fourier transform to obtain the time-domain signal after the frequency chirp correction.
    Type: Application
    Filed: February 13, 2020
    Publication date: August 27, 2020
    Inventors: Changqiao LIU, Xiaofeng JIN, Xianbin YU, Xiangdong JIN, Xianmin ZHANG, Shilie ZHENG, Qinggui TAN, Bo CONG