[2] [2] Cucinotta A, Selleri S, Vincetti L, et al. Holey fiber analysis through the finite-element method [J]. IEEE Photonic Technol Lett, 2002, 14(11):1530-1532.

[5] [5] Haxha S, Ademgil H. Novel design of photonic crystal fibers with low confinement losses, nearly zero ultra-flatted chromatic dispersion, negative chromatic dispersion and improved effective mode area[J]. Opt. Communications, 2008, 281 (2) 278-286.

[6] [6] Beeker P C, Olsson N A, SimPson J R. Erbium-doped fiber amplifiers: fundamentals and technology[M]. SanDiego: Aeademie Press,1999:140-144.

[8] [8] Lim H, Ilay F, Wise F. Femtosecond ytterbium fiber laser with photonic crystal fiber for dispersion control [J]. Opt. Express, 2002, 10(25):1497-1502.

[10] [10] Randy C Gile, Emmanuel Desurvire. Modeling Erbium-doped fiber amplifiers[J]. Journal of Lightwave Technology, 1991, 9(2):271-283.