【摘要】 量子点半导体光放大器(QDSOA)具有更小的载流子恢复时间和更高的放大带宽,是光信息处理的理想器件。利用QDSOA三能级电子跃迁速率方程和光场传输方程,建立了有源区分段模型,对饱和QDSOA的频率响应特性进行研究,得到输入光功率、注入电流、有源区长度、最大模式增益和载流子跃迁时间等参数与3dB截止频率和抑制比之间的关系。结果表明,饱和QDSOA具有高通滤波特性,有较宽的高频信号放大带宽和较高的3dB截止频率,通过优化参数,可以获得比传统体材料和量子阱材料半导体光放大器更加优异的特性,为QDSOA的设计与应用提供了理论指导。更多还原

【Abstract】 Quantum dot semiconductor optical amplifiers(QDSOAs)are ideal devices for optical signal processing due to their shorter carrier recovery time and larger amplification bandwidth.With the three-level electron transition rate equations and the traveling-wave equations in QDSOAs,a segmented numerical model of the active region is established.Based on this model,the frequency response characteristics of saturated QDSOAs are obtained and the impacts of input optical power,injection current,active region length,maximum modal gain and carrier transition time on the 3 dB cutoff frequency and suppression ratio are investigated.The results show that the saturated QDSOA has a high pass filter characteristic with large bandwidth and a high 3 dB cutoff frequency.By optimizing the QDSOAs′parameters,the more excellent properties can be obtained than the traditional buck or quantum well semiconductor optical amplifiers.These features will provide useful theoretical instructions on the designs and applications of QDSOAs at the saturated states.更多还原