[1] Key Laboratory of In-Fiber Integrated Optics, Ministry of Education and College of Science, Harbin Engineering University, Harbin,150001, China
[2] College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin,150001, China
[3] Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin,150025, China