强超短脉冲抽运下半导体光放大器中的非线性过程

建立了包含载流子浓度脉动(CDP)、自由载流子吸收(FCA)、受激辐射(SE)、双光子吸收(TPA)、光谱烧孔(SHB)和超快非线性折射(UNR)过程的半导体光放大器(SOA)理论模型，通过与已报道的实验结果的比较对模型进行了验证，实现了对已有 SOA模型的修正，并对UNR，FCA和TPA效应对强超短光脉冲传输特性的影响进行了分析.当脉宽为几个皮秒的强光脉冲注入工作于透明电流下的SOA时，其强度特性主要受FCA和TPA效应的影响.由于加入了FCA效应，使模型对200fs脉冲强度传输特性的仿真结果与实验结果 关键词： 非线性过程 强超短光脉冲 SOA理论模型 增益透明

Nonlinear processes in strong ultrashort pulse pumped semiconductor optical amplifier

A theoretical model of semiconductor optical amplifier (SOA) is presented with carrier density pulsation (CDP)，free-carrier absorption (FCA)，stimulated emission (SE)，two-photon absorption (TPA)，spectral hole burning (SHB) and ultrafast nonlinear refraction (UNR) taken into account. The model is proved by comparing with the reported experimental results. The prevailing SOA model is revised. The influences of FCA and TPA processes on ultrashort strong optical pulses are analysed. When the strong optical pulse with several-picosecond pulsewidth is injected into the SOA operating under the transparency current，the intensity characteristics of the optical pulse are mainly influenced by TPA and FCA. As a result of taking the FCA effect into account，the intensity transmission characteristics of 200fs optical pulses obtained by the new model basically agree with the experimental results. It broadens the applicability of the model.