1. Key Laboratory of Optical Fiber Sensing and Communications (Ministry of Education) School of Information and Communication Engineering University of Electronic Science and Technology of China Chengdu 611731 China
2. School of Electrical and Electronic Engineering Nanyang Technological University 639798 Singapore
3. Institute of Southwestern Communication, Science and Technology on Security Communication Laboratory Chengdu 610041 China
4. Zhejiang Laboratory Research Center for Optical Fiber Sensing Hangzhou Zhejiang 310000 China