1 Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Jinan University, Guangzhou 510632, China
2 Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, China
3 Key Laboratory of Visible Light Communications of Guangzhou, Jinan University, Guangzhou 510632, China
4 School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China
5 State Key Laboratory of Optoelectronic Materials and Technologies and School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China