1Key Laboratory of Optical Fiber Sensing & Communications (Education Ministry of China), University of Electronic Science & Technology of China (UESTC), Chengdu , Sichuan 611731, China
2Center for Information Geoscience, UESTC, Chengdu , Sichuan 611731, China
3Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang , Sichuan 621900, China
4Research Center for Optical Fiber Sensing, Zhejiang Laboratory, Hangzhou , Zhejiang 311121, China