为了对单端量子点半导体光放大器(QD-SOA)全光波长转换器的增益恢复特性进行系统分析, 采用分段法和4阶龙格-库塔法, 利用单端QD-SOA的交叉增益调制效应的全光波长转换原理分别求解速率方程和光场方程, 分析了注入电流、后端面反射率以及最大模式增益等变化时对单端QD-SOA全光波长转换器增益恢复时间的影响。结果表明, 当增大注入电流和后端面反射率、减小最大模式增益时, 均可以减小增益恢复时间, 进而可以通过优化上述参量改善单端QD-SOA的增益恢复特性。

To explore the gain recovery time of converted signal in detail, rate equations and light field transfer equations were solved based on all-optical wavelength cross-gain modulation (XGM) in a single-port-coupled quantum-dot semiconductor optical amplifier(QD-SOA) by utilizing the segment method and the forth-order Runge-Kutta method. The effects of various parameters, including injection current, rear facet reflectivity and the maximum modal gain on gain recovery time of a single-port-coupled QD-SOA was studied. The results show that the gain recovery time of a single-port-coupled QD-SOA can be decreased by increasing the injected current or rear facet reflectivity and decreasing the maximum modal gain. The low gain recovery time of a single-port-coupled QD-SOA can be achieved by optimizing these parameters.