In this paper, the photocurrent self-correlation function of uniform-frequency crosstalk is discussed in arrayed waveguide grating, the self-correlation coefficient of uniform-frequency crosstalk is researched in theory. The relation of correlation coefficient and delay as uniform-frequency crosstalk, RF and τ、n, noise power of uniform-frequency crosstalk and polarization direction are investigated, the obtained conclusions numerical results demonstrate that the signal transmission of AWG exists negative correlation section, weakly correlation and positive correlation section. The effect of crosstalk delay vs enregistration is a periodicity chang.