Investigation on Slow Light of Nonuniform Photonic Crystal Fiber

2014 
Based on the coupled-mode theory and transmission matrix method, the in∞uences of Gaussian apodization coe-cient and linear chirp coe-cient on group velocity of photonic crystal flber Bragg gratings are demonstrated. The results indicate that the minimum value of group velocity flrst decreases and then increases with the increase of apodization coe-cient when the 'dc' index change value is big enough, which means that the minimum value of group velocity can be optimized at a certain apodization coe-cient. But when the 'dc' index change value is very small, the minimum value of group velocity increases with the increase of apodization coe-cient. A good linear area of the group velocity can be obtained by linear chirp and the linear area can be broadened by increasing the absolute value of chirp coe-cient.
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