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提出了一个描述半导体光放大器 (SLA)对皮秒脉冲的放大这一物理过程的较为完善的物理模型 ,并数值分析了光脉冲经SLA放大后的上升时间和下降时间 .结果表明 :随着SLA偏置电流的增大 ,上升时间将缩短而下降时间将延长 ;输入脉冲的大峰值功率将加速上升时间的缩短和下降时间的延长 ;增益压缩对脉宽为几个皮秒的输入脉冲的上升时间和下降时间有明显的影响 ,而对脉宽为几十皮秒的输入脉冲可近似认为没有影响 ;增益非对称和漂移强烈影响上升和下降时间
A perfect physical model describing the physical process of amplifying picosecond pulses by a semiconductor optical amplifier (SLA) is proposed and the rise time and fall time of the optical pulse amplified by SLA are numerically analyzed.The results show that with the SLA As the bias current increases, the rise time will be shortened and the fall time will be extended. The large peak power of the input pulse will accelerate the shortening of the rise time and the decrease of the fall time. The gain compression will increase the rise of the input pulse whose pulse width is several picoseconds Time and fall time have a significant impact on the pulse width of dozens of picoseconds of the input pulse can be approximately considered as no effect; gain asymmetry and drift strongly affect the rise and fall time