[1] [1] Y. Xie, S. Lee, Z. Pan, J.-X. Cai, A. E. Willner, V. Grubsky, D. Starodubov', E. Salik, and J. Feinberg, in Proceedings of OFC'2000 ThS2-1, 271 (2000).

[2] [2] L. Gruner-Nielsen, B. Edvold, D. Magnussen, D. Peckham, A. Vengsarkar, D. Jacobsen, T. Veng, C. C. Larsen, and H. Damsgaard, in Proceedings of OFC'1998 TuD5, 24 (1998).

[3] [3] J. C. Knight, T. A. Birks, P. S. J. Russell, and D. M. Atkin, Opt. Lett. 21, 1547 (1996).

[4] [4] J. Broeng, D. Mogilevstev, S. E. Barkou, and A. Bjarklev, Opt. Fiber Technol. 5, 305 (1999).

[5] [5] Y. Ni, L. Zhang, and J. Peng, Chin. Opt. Lett. 1, 385 (2003).

[6] [6] J. C. Knight, J. Arriaga, T. A. Birks, A. Ortigosa-Blanch, W. J. Wadsworth, and P. St. J. Russell, IEEE Photon. Technol. Lett. 12, 807 (2000).

[7] [7] A. Ferrando, E. Silvestre, P. Andres, J. J. Miret, and M. V. Andres, Opt. Express 9, 687 (2001).

[8] [8] T. A. Birks, D. Mogilevtsev, J. C. Knight, and P. St. J. Russell, IEEE Photon. Technol. Lett. 11, 674 (1999).

[9] [9] K. Saitoh, M. Koshiba, T. Hasegawa, and E. Sasaoka, Opt. Express 11, 843 (2003).

[10] [10] L. P. Shen, W.-P. Huang, G. X. Chen, and S. S. Jian, IEEE Photon. Technol. Lett. 15, 540 (2003).