1. Key Laboratory of In-fiber Integrated Optics of Ministry of Education College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin, China
2. Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, China
3. Jiangsu Key Laboratory of Advanced Laser Materials and Devices School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou, Jiangsu, China
4. Optoelectronics Research Centre, University of Southampton, Southampton, U.K.
5. Key Laboratory of In-Fiber Integrated Optics of Ministry of Education, College of Science Harbin Engineering University, Harbin, China