引入了正切函数作为非线性光-电流关系函数，借助于速率方程，建立了光学双稳半导体激光器的理论模型。对器件本身进行了理论分析，讨论了器件的主要特性，给出了数值分析结果，提出了器件性能改进方法。

A tangential function is introduced to describe the nonlinear light-electriccurrent relation of a photo-electric diode. Based on the rate equations of semiconductorlaser and the nonlinear function equation mentioned above, we have established thetheory of bistable laser diode (BILD) and analyzed the major properties of BILD usingthis method. Finaly, the ways for improving the response feature of BILD are proposedaccording to the numerical analysis results.