[1] Shelby R A, Smith D R, Schultz S. Experimental verification of a negative index of refraction. Science, 2001, 292(5514): 77-79

[2] Shalaev V M. Optical negative-index metamaterials. Nature Photonics, 2006, 1: 41-48

[3] Birks TA, Knight J C, Russell P S. Endlessly single-mode photonic crystal fiber. Optics Letters, 1997, 22(13): 961-963

[4] Yan M, Shum P. Antiguiding in microstructured optical fibers. Optics Express, 2004, 12(1): 104-116

[5] Koshiba M, Saitoh K. Simple evaluation of confinement losses in holey fibers. Optics Communications, 2005, 253(1-3): 95-98

[6] Wang A, George A, Liu J, Knight J. Highly birefringent lamellar core fiber. Optics Express, 2005, 13(16): 5988-5993

[7] Hu J, Yan M, Shum P. Birefringent optical fiber with a photoniccrystal core. In: Proceedings of Australian Conference on Optical Fibre Technology (ACOFT), 2006, 60-62

[8] Yu X, Shum P, Yan M, Ren G. Silica based birefringent large mode area fiber with a nanostructure core. IEEE Photonics Technology Letters, 2008, 20(4): 246-248

[9] Yu X, Shum P, Ngo N, Tong W, Luo J, Ren G, Gong Y, Zhou J. Silica-based nanostructure core fiber. IEEE Photonics Technology Letters, 2008, 20(2): 162-164

[10] Yan M, Shum P. Analysis of perturbed Bragg fibers with an extended transfer matrix method. Optics Express, 2006, 14(7): 2596-2610

[11] Yeh P, Yariv A, Marom E. Theory of Bragg fiber. Journal of the Optical Society of America, 1978, 68(9): 1196-1201

[12] Johnson S, Ibanescu M, Skorobogatiy M, Weisberg O, Engeness T, Soljacic M, Jacobs S, Joannopoulos J, Fink Y. Low-loss asymptotically single-mode propagation in large-core OmniGuide fibers. Optics Express, 2001, 9(13): 748-779