[1] [1] J. C. Knight, T. A. Birks, P. St. J. Russell, and D. M. Atkin, Opt. Lett. 21, 1547 (1996).

[2] [2] T. A. Birks, J. C. Knight, and P. St. J. Russell, Opt. Lett. 22, 961 (1997).

[3] [3] S. M. A. Razzak and Y. Namihira, IEEE Photon. Technol. Lett. 20, 249 (2008).

[4] [4] F. Couny, P. J. Roberts, T. A. Birks, and F. Benabid, Opt. Express 16, 20626 (2008).

[5] [5] M. D. Nielsen, C. Jacobsen, N. A. Mortensen, J. R. Folkenberg, and H. R. Simonsen, Opt. Express 12, 1372 (2004).

[6] [6] B. A. Cumberland, J. C. Travers, S. V. Popov, and J. R. Taylor, Opt. Express 16, 5954 (2008).

[7] [7] L. Fang, J. Zhao, and X. Gan, Chin. Opt. Lett. 8, 1028 (2010).

[8] [8] W. H. Reeves, J. C. Knight, P. St. J. Russell, and P. J. Roberts, Opt. Express 10, 609 (2002).

[9] [9] A. Ferrando, E. Silvestre, J. J. Miret, and P. Andres, Opt. Lett. 25, 790 (2000).

[10] [10] K. Saitoh, M. Koshiba, T. Hasegawa, and E. Sasaoka, Opt. Express 11, 843 (2003).

[11] [11] M. Pourmahayabadi and S. M. Nejad, in Proceedings of International Conference on Applied Electronics 2009 211 (2009).

[12] [12] E. Kerrinckx, L. Bigot, M. Douay, and Y. Quiquempois, Opt. Express 12, 1990 (2004).

[13] [13] D. Yevick and B. Hermansson, IEEE J. Quantum Electron. 26, 109 (1990).

[14] [14] D. Yevick and B. Hermansson, IEEE J. Quantum Electron. 25, 221 (1989).

[15] [15] G. R. Hadley, IEEE J. Quantum Electron. 28, 363 (1992).

[16] [16] I. H. Malitson, J. Opt. Soc. Am. 55, 1205 (1965).

[17] [17] C. Chaudhari, T. Suzuki, and Y. Ohishi, in Proceedings of OFC 2009 OTuC4 (2009).

[18] [18] N. H. Hai, Y. Namihira, S. Kaijage, F. Begum, T. Kinjo, and S. M. A. Razzak, in Proceedings of SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference 46 (2007).

[19] [19] H. Xu, J. Wu, K. Xu, Y. Dai, C. Xu, and J. Lin, "Ultra-flattened chromatic dispersion control for circular photonic crystal fibers" submitted to J. Opt.