In this paper, the properties of chirped photonic crystal fibers for guiding sub-100-fs pulses are discussed by numerical simulations and approximate analytical considerations. The nearly distortion-free guiding properties are explained by a spectral distribution of detrimental dispersive resonances. Deeper analysis reveals the geometrical properties of the innermost layer of the photonic cladding structure as a key parameter for the dispersive properties of this fiber. It is further investigated how systematic manipulation of the geometry can be exploited for influencing the guiding parameters.
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