Non-linear gain compression is well-known to play an important role in the dynamics of short-pulse generation and propagation in semiconductor lasers. Here, a previously reported delay differential equation model for passively mode-locked semiconductor lasers is enhanced with nonlinear gain compression terms in gain and absorber sections. We report the modified model equations and show the impact in gain/absorption dynamics with respect to the original model. In addition, we perform an extended comparison between the enriched delay differential equation model applied on a ring cavity and a travelling wave model applied on an equivalent Fabry-Perot cavity, highlighting the limits of quantitative and qualitative agreement between the two approaches.

中文翻译：

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用于被动锁模半导体激光器的带有非线性增益压缩的延迟微分方程

众所周知，非线性增益压缩在半导体激光器的短脉冲产生和传播动力学中起着重要作用。在这里，先前报道的被动锁模半导体激光器的延迟微分方程模型通过增益和吸收器部分中的非线性增益压缩项得到增强。我们报告了修改后的模型方程，并展示了对原始模型的增益/吸收动力学的影响。此外，我们对应用于环形腔的丰富延迟微分方程模型和应用于等效 Fabry-Perot 腔的行波模型进行了扩展比较，突出了两种方法之间定量和定性一致性的局限性。