Abstract: We have analysed and calculated the coupling coefficients for TE mode of the periodic structure in distributed feedback lasers by the method of characteristic matrix. Simple analytic results of coupling coefficients expressed as functions of film corrugation shape, height and film thickness are here presented. Equations for various corrugation shapes such as rectangular, sinusoidal, symmetrical-triangular and sawtooth are evaluated. It is shown that the accuracy of the formulae we derived is quite good.