1. School of Optoelectronic and Communication Engineering, Xiamen University of Technology, Xiamen, China
2. Key Laboratory of Modern Precision Measurement and Laser Nondestructive Detection, Putian University, Putian, China
3. Fujian Key Laboratory of Optoelectronic Technology and Devices, Xiamen University of Technology, Xiamen, China
4. Wireless and Optoelectronics Research and Innovation Centre, University of South Wales, Cardiff, UK