State Key Laboratory Luminescent Materials and Devices Institute of Optical Communication Materials Special Glass Fiber and Device Engineering Technology Research and Development Center of Guangdong Province Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques South China University of Technology Guangzhou 510640 China
State Key Laboratory Luminescent Materials and Devices Institute of Optical Communication Materials Special Glass Fiber and Device Engineering Technology Research and Development Center of Guangdong Province Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques South China University of Technology Guangzhou 510640 China