1. Key Laboratory of In-Fiber Integrated Optics, Ministry of Education, Harbin Engineering University, Harbin 150001, P. R. China
2. Key Laboratory of Photonic Materials and Device Physics for Oceanic Applications, Ministry of Industry and Information Technology of China, Harbin Engineering University, Harbin 150001, P. R. China
3. Research Center of Space Optical Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China
4. MOE Frontiers Center for Brain Science, State Key Laboratory of Medical Neurobiology, Institutes for Translational Brain Research, Fudan University, Shanghai 200032, P. R. China
5. Qingdao Innovation and Development Center, Harbin Engineering University, Qingdao 266500, P. R. China
6. Photonics Research Center, Guilin University of Electronics Technology, Guilin 541004, P. R. China