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通过考虑脉冲频谱的增益色散,提出了一个分析亚皮秒光脉冲在半导体光放大器(SOA)中传输的新思路.分别对超快光脉冲在时域和频域内进行离散化,建立了一个更为合理的传输数值模型.基于该模型,观察到了脉冲频谱的明显漂移,并探讨了漂移量与脉冲载波波长、脉冲能量、脉冲宽度、SOA长度和注入电流等外部条件之间的关系,从理论上解释了文献没有证实的实验结果.同时,基于交叉增益调制原理,利用双光束结构,描述了载流子加热、光谱烧孔效应和双光子吸收等非线性效应引起的增益压缩.理论分析的结果为改善SOA的动态特性提供了指导.
By considering the gain dispersion of the pulse spectrum, a new idea to analyze the transmission of sub-picosecond optical pulses in a semiconductor optical amplifier (SOA) is proposed. Discretization of the ultra-fast optical pulse in the time domain and the frequency domain are separately performed, A reasonable numerical model for the transmission is proposed.Based on the model, the obvious drift of the pulse spectrum is observed and the relationship between the drift and the external conditions such as the pulse carrier wavelength, pulse energy, pulse width, SOA length and injection current is discussed, The experimental results not confirmed in the literature are explained.At the same time, based on the principle of cross-gain modulation, the gain compression caused by the nonlinear effects of carrier heating, spectral hole burning and two-photon absorption is described by using the double beam structure. The results provide guidance for improving the dynamic behavior of SOA.