利用线性对称耦合器两个波导中光场的电矢量构建了布洛赫矢量模型.通过布洛赫矢量的旋转变化使得光在两个波导通道中“跃迁”的过程非常直观.研究发现,随着线性对称耦合器的相位失配变得越严重,光能量在波导间的转换频率增快且转换效率降低,与传统的求解线性对称耦合器耦合波方程所得到的结果是一致的. The Bloch vector model is constructed by using the electric vector of the light field in the two waveguides of a linear symmetric coupler. The process of “transition ” by the rotation of the Bloch vector is very intuitive. As the phase mismatch of the linear symmetric coupler becomes more serious, the conversion frequency of optical energy between the waveguides increases and the conversion efficiency decreases, which is consistent with the traditional solution of coupled wave equation of linear symmetric coupler.