The Scalar Theory and a Simplified Model of Arrayed Wave-guide Grating Demux
阵列波导光栅解复用器的标量传输理论及其简化模型

The mathematical model of light propagation in arrayed waveguide grating is elicited based on original mode field in input waveguide. With the input light field approximated as Gauss field,a simplified Gauss propagation model is also elicited.By comparing with the real situation, the rationality of simplified Gauss model is proved. With a required out put cross-talk, using the Gauss simplified model, the ratio of the position of the outmost waveguide and the beam waist of diffracted field can be designed, so the light power in outermost arrayed waveguide can be decided, this Gauss simplified model provided a easy practicable way in AWG design but for more accurate design and simulation, the real light filed transfer model should be considered.