Abstract
Based on improved effective index method,the coupled-mode theory and transmission matrix method,the influence of Gaussian apodizations and chirp coefficients on group delay of photonic crystal fiber Bragg gratings are demonstrated. The results indicate that the group delay first increases and then decreases when apodization coefficients increase,which means that the maximum value of group delay can be obtained at a given apodization coefficient. A good linear area of the group delay can be obtained by linear chirp gratings,and the linear area is broadened by increasing the absolute value of chirp coefficient. But linear chirp gratings don't get smaller group velocity in a particular band. Gaussian apodization is an effective way to tailor the group delay of fiber gratings,which can not only adjust the full width at half maximum but also influence the height.
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