1. Key Laboratory of Optical Fiber Sensing and Communications (Education Ministry of China), University of Electronic Science and Technology of China, Chengdu 610054, China
2. Research Centre of Optical Fiber Sensing, Zhejiang Laboratory, Hangzhou 310000, China
3. State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
4. Guangdong and Hong Kong Joint Research Center for Optical Fiber Sensors, Shenzhen University, Shenzhen 518060, China
5. Institute of Solid State Physics, Abbe Center of Photonics, Friedrich-Schiller-University Jena, Jena 07743, Germany