The effect of Direct Current (DC) apodization on the Fiber Bragg Gratings (FBG) was investigated with mode-coupling theory and experiment

and the relationship of the DC apodization and the grating chirp was given. Both of the uniform FBG’s and chirped FBG’s (CFBG) group delays were changed after linear DC apodization. A uniform period FBG with a linear dispersion -2 126 ps/nm was fabricated using a uniform phase mask

also the CFBGs with dispersion values of -1 599.362 71 ps/nm

-1 250.4 ps/nm and -2 011.4 ps/nm were fabricated with the same chirped phase mask

respectively

which shows the experimental results agree well with those theories reported in literatures.