1. Key Laboratory of In-Fiber Integrated Optics Ministry Education of China Harbin Engineering University Harbin 150001 P. R. China
2. Chongqing Key Laboratory of Multi-Scale Manufacturing Technology Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing 400714 P. R. China
3. College of Mechanical Engineering Chongqing University Chongqing 400714 P. R. China
4. Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing Guilin 541004 China