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Analysis of the error of chromatic dispersion when using approximation of material disperson plus waveguide dispersion in photonic crystal fibers

We calculated the errors of Chromatic dispersion (CD) in PCFs, under different air filling fraction f, that is under different refractive index difference ▵, by comparing the waveguide dispersion Dw between the formula of Dw, and that calculated from Deff the chromatic dispersion of effective index and the fiber core material dispersion Dm.