1Guangxi Key Laboratory of Wireless Broadband Communication and Signal Processing, College of Information and Communication, Guilin University of Electronic Technology, Guilin,Guangxi 541004, China
2Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, Guangdong 518060, China
3Guangdong and Hong Kong Joint Research Centre for Optical Fiber Sensors, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, Guangdong 518060, China