1. Key Laboratory of In-fiber Integrated Optics Ministry of Education, College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150001, People’s Republic of China
2. Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing, Guilin University of Electronic Technology, Guilin 541004, People’s Republic of China
3. Academy of Marine Information Technology, Guilin University of Electronic Technology, Beihai 536000, People’s Republic of China