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在量子点半导体光放大器(QD-SOA)的静态模型基础上,建立了动态模型。讨论了基于QD-SOA的交叉增益调制(XGM)的波长转换特性原理。采用细化分段方法及四阶龙格-库塔法求解速率方程及光场传输方程,给出了变换前后的波形对照。通过改变QD-SOA的自身及外部参数,讨论了输出探测光消光比的影响因素,结果表明增大泵浦光功率、减小探测光功率、增大注入电流及有源区长度都可以增大消光比,从而能够增强信号的抗干扰能力。
Based on the static model of quantum dot semiconductor optical amplifier (QD-SOA), a dynamic model is established. The principle of wavelength conversion of cross-gain modulation (XGM) based on QD-SOA is discussed. The thin section method and the fourth order Runge-Kutta method are used to solve the velocity equation and the light field transmission equation, and the waveforms before and after transformation are given. By changing the QD-SOA’s own and external parameters, the influence factors of the output probe light extinction ratio are discussed. The results show that increasing the pump light power, reducing the probe light power, increasing the injection current and the length of the active region can all increase Extinction ratio, which can enhance the anti-interference ability of the signal.