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.

A Bloch vector model was set up using the light field electric vector in two waveguides of the liner symmetric coupler. The light “transition” process in two waveguide channels was quite directly with the Bloch vector rotation changing. It was found that the more serious the propagation constant mismatches, the faster the frequency of light energy exchanges and the lower efficiency exchanges, which is equal to the results solved by the traditional equations.