[1] T. Li, Y.T. Dai and Q.C. Zhao, Journal of Optoelectronics ·Laser 25, 625 (2014). (in Chinese)
[2] S.L Zhang, Z.W. Zhao, N. Chen, F.F. Pang, Z.Y. Chen, Y.Q. Liu and T.Y. Wang, Optics Letters 40, 1362 (2015).
[3] W.H. Bi, C.Q. Zhu, X.H. Fu, G.W. Fu and B.J. Zhang, Journal of Optoelectronics·Laser 25, 1443 (2014). (in Chinese)
[4] Z.Y. Bai, W.G. Zhang, S.C. Gao, H. Zhang, L. Wang and F. Liu, Optical Fiber Technology 21, 110 (2015).
[5] M. Ding, M.N. Zervas and G. Brambilla, Optics Express 19, 15621 (2011).
[6] Y.X. Zhang, X.L. Wu, Z.F. Ying and X.P Zhang, Electronics Letters 50, 1014 (2014).
[7] S.M. Maughan, H.H. Kee and T.P. Newson, Measurement Science and Technology 12, 834 (2001).
[9] F.B. Mej′ a, C.R. Biazoli and C.M.B. Cordeiro, Optics Express 22, 30432 (2014).
[10] S. Yuan, Z.R.Tong, J.F. Zhao, W.H. Zhang and Y. Cao, Optics Communications 332, 154 (2014).
[11] J.J. Wang, E.M. Lally, X.P. Wang, J.M. Gong, G. Pickrell and A.B. Wang, Applied Optics 51, 2129 (2012).
[12] H.B. Gan, Z. Chen, J. Zhang, H.B. Gan, J.Y. Tang, Y.H. Luo, J.H. Yu, H.H. Lu and H.Y. Guang, Journal of Optoelectronics ·Laser 26, 633 (2015). (in Chinese)
