1. School of Opto-electronic Information Science and Technology
2. Yantai University
3. Yantai 264005
4. P. R. China
5. School of Physics and Electronic Engineering
6. Linyi University
7. Linyi
8. School of Physical Science and Information Technology
9. Shandong Key Laboratory of Optical Communication Science and Technology
10. Liaocheng University
11. Liaocheng