[1] [1] J. C. Knight, Nature 424, 847 (2003).

[2] [2] Russell, Science 299, 358 (2003).

[3] [3] J. C. Knight, T. A. Birks, and P. St. J. Russell, Opt. Lett. 21, 1547 (2000).

[4] [4] T. A. Birks, J. C. Knight, and P. St. J. Russell, Opt. Lett. 22, 961 (1997).

[5] [5] J. C. Knight, J. Broeng, and T. A. Birks, Science 282, 1476 (1998).

[6] [6] R. F. Cregan, B. J. Mangan, and J. C. Knight, Science 285, 1537 (1999).

[7] [7] R. J. Yu, Y. Xiang, and M. Y. Chen, J. Optoelectronics Laser (in Chinese) 15, 775 (2004).

[8] [8] B. J. Mangan, J. C. Knight, T. A. Birks, and P. St. J. Russell, Electron. Lett. 36, 1358 (2000).

[9] [9] J. Canning, M. A. V. Eijkelenborg, and T. Ryan, Opt. Commun. 185, 321(2000).

[10] [10] B. H. Lee, J. B. Eom, J. Kim, and D. S. Moon, Opt. Lett. 27, 812 (2002).

[11] [11] F. Fogli, L. Saccomandi, and P. Bassi, Opt. Express 10, 54 (2002).

[12] [12] H. Kim, J. Kim, and U. C. Paek, Opt. Lett. 29, 1194 (2004).

[13] [13] L. Zhang and C. X. Yang, Opt. Express 11, 1015 (2003).

[14] [14] L. Zhang and C. X. Yang, J. Lightwave Technol. 22, 1367 (2004).

[15] [15] K. Saitoh, Y. Sato, and M. Koshiba, Opt. Express 12, 3940 (2004).

[16] [16] L. Zhang and C. X. Yang, Opt. Express 12, 2371 (2004).

[17] [17] M. Yang and R. J. Yu, J. Opt. A: Pure Appl. Opt. 6, 805 (2004).

[18] [18] N. A. Issa, A. Martijn, and V. Eijkelenborg, Opt. Lett. 29, 1336 (2004).

[19] [19] T. M. Monro, D. J. Richardson, and N. G. R. Broderick, J. Lightwave Technol. 18, 50 (2000).

[20] [20] B. T. Kuhlmey, T. P. White, and G. Renversez, J. Opt. Soc. Am. B 19, 2331 (2002).