[1] [1] W. Krolikowski, O. Bang, N. I. Nikolov, D. Neshev, J. Wyller, J. J. Rasmussen, and D. Edmundson, J. Opt. B 6, 288 (2004).

[2] [2] Q. Guo , B. Luo, and S. Chi, Opt. Commun. 259, 336 (2006).

[3] [3] D. M. Deng, Q. Guo, and W. Hu, Phys. Rev. A 79, 023803 (2009).

[4] [4] H. Li , J. Optoelectron. Adv. Mater. 13, 509 (2011).

[5] [5] Q. Kong, Q. Wang, O. Bang, and W. Krolikowski, Phys. Rev. A 82, 013826 (2010).

[6] [6] Y. Y. Lin and R. K. Lee, Opt. Express 15, 8781 (2008).

[7] [7] A. Hasegawa and Y. Kodama, Solitons in Optical Communications (Clarendon Press, Oxford, 1995).

[8] [8] S. Raghavan and G. P.Agrawal, J. Modern Opt. 47, 1155 (2000).

[9] [9] H. Li, Y. Cheng, and D. Huang, J. Low Temperature Phy. 140, 11 (2005).