1. School of Opto-electronic and Communication Engineering Fujian Provincial Key Laboratory of Optoelectronic Technology and Devices Xiamen University of Technology Xiamen 361024 China
2. School of Electronic and Information Engineering Beihang University Beiijng 100083 China
3. Silan Academy of Compound Semiconductor Technology Xiamen Silan Advanced Compound Semiconductor Co., Ltd. Xiamen 361026 China