1. Jiangxi Key Laboratory of Photoelectronics and Telecommunication, College of Physics and Communication Electronics, Jiangxi Normal University, Nanchang, China
2. National Electrical and Electronic Experimental Teaching Demonstration Center, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, China
3. Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology, Hohai University, Changzhou, China
4. Department of Physics, Jiangxi Normal University Science and Technology College, Jiujiang, China