给出了一种描述有限长非线性光波导的方法，分析了该类波导的透射特性，结果表明在这类波导中具有多稳态效应．并将该方法与非线性Ｆ－Ｐ腔理论进行了比较，表明该方法比非线性Ｆ－Ｐ腔理论更为精确。 A method for describing finite length nonlinear optical waveguides is given. The transmission characteristics of such waveguides are analyzed. The results show that there are many steady states in these waveguides. The comparison between the proposed method and the nonlinear F-P cavity theory shows that the proposed method is more accurate than the nonlinear F-P cavity theory.