首次在理论上用量子阱激光器增益与载流子密度的对数关系替代了原有速率方程中的线性关系，得到了改进了的速率方程，分析了稳态和调制特性。从理论上得到了获得最低阈值的最佳阱数和最大调制带宽的最佳腔长。

The linear relation of gain on carrier density in the conventional rate equation is replaced by the logarithmic relation for quantum well lasers in this paper. The static and dynamic behaviors brought by the revision are analyzed. An optimal well number for the minimum threshold currenl and an optimal cavity length for the highest modulation frequency have been obtained.