波导临界截面处的模式耦合

Mode Coupling at Waveguide Critical Cross Section

本文基于弱耦合理论，在分析临界截面处模式耦合物理图象的基础上将临界截面处的模式耦合问题与传输模式的模式耦合在数学处理上统一起来，并据此应用数值方法计算了模式变换器中具有临界截面的杂模Ｅ２１的幅度。

This paper analyses the mode coupling at critical cross section by using the weakly coupled mode theory. The contribution of mode coupling at critical cross section is included in the integral formula, which has been considered for guided modes only. As an example, the amplitude of the E 21 spurious mode in a transducer is calculated numerically and compared with the previous result.