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 For the first time, in theory, the logarithm of the quantum well laser gain and carrier density logarithmically replaced the linear relationship in the original rate equation. An improved rate equation was obtained and the steady-state and modulation characteristics were analyzed. The optimal cavity length and maximum modulation bandwidth for obtaining the lowest threshold are theoretically obtained