[1] Knight J C, Birks T A, Russell P St J,et al.All-silica single-mode optical fiber with photonic crystal cladding.Optics Letters, 1996,21(19):1547～1549

[2] Russell P. Photonic crystal fibers.Science, 2003,299(5605):358～362

[4] Furusawa K, Malinowski A, Price J H V,et al. Cladding pumped Ytterbium-doped fiber laser with holey inner and outer cladding.Optics Express, 2001,9(13):714～720

[5] van Eijkelenborg M A, Large M C J, Argyros A,et al.Microstructured polymer optical fibre.Optics Express,2001,9(7): 319～327

[6] White T P, McPhedran R C, de Sterke C M,et al.Confinement losses in microstructured optical fibers.Optics Letters, 2001,26(21):1660～1662

[7] Hasegawa T, Sasaoka E, Onishi M, et al. Hole-assisted lightguide fiber for large anomalous dispersion and low optical loss.Optics Express, 2001,9(13): 681～686

[8] De Francisco C A, Borges B V, Romero M A. A semivectorial method for the modeling of photonic crystal fibers. Microwave and Optical Technology Letters, 2003,38(5): 418～421

[9] Kawano K, Kitoh T. Introduction to Optical Waveguide Analysis: Solving Maxwell's Equations and the Schr dinger Equation. New York: John Wiley & Sons, 2001. 117～164

[10] Zhu Z, Brown T G. Multipole analysis of hole-assisted optical fibers.Optics Communications, 2002,206(4-6):333～339

[11] Steel M J, White T P, de Sterke C M,et al. Symmetry and degeneracy in microstructured optical fibers.Optics Letters, 2001,26(8):488～490

[12] Koshiba M, Saitoh K. Numerical verification of degeneracy in hexagonal photonic crystal fibers.IEEE Photonics Technology Letters, 2001,13(12):1313～1315