1. College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China
2. Department of Electronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
3. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
4. Faculty of Sciences, Beijing University of Technology, Beijing 100124, China
5. National Center for Applied Mathematics, Chongqing Normal University, Chongqing 401331, China