A two-dimensional code/encode based on chirped fiber Bragg grating (CFBG) and fiber Bragg grating (FBG) is proposed. The degradation of autocorrelation peak with wavelength mismatch of the FBG, and the deterioration of bit error rate consequentially, are investigated. The experimental result of output power versus different mismatch wavelengths and hops is given. The results indicate that the decoder based on CFBG can improve output power a little, which also decrease wavelength matching accuracy and provide dispersion compensation.