1. College of Science, University of Shanghai for Science and Technology, Shanghai 200093, China
2. Shanghai Key Laboratory of Modern Optical System, University of Shanghai for Science and Technology, Shanghai 200093, China
3. The Key Lab of Specialty Fiber Optics and Optical Access Network, Shanghai University, Shanghai 200072, China
4. Laboratory L.P.S., Department of Physics, Faculty of Sciences, Badji-Mokhtar Annaba University, Annaba 23000, Algeria