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以包含增益色散、增益饱和、三阶色散、自陡峭、自频移等高阶效应的光纤放大器为研究对象,对其产生渐近抛物型自相似脉冲的条件及传输特性进行了详细的讨论。结果表明,合理选择系统参数,在渐近约束条件下,可以获得不同振幅和脉宽大小的自相似脉冲;此外,非线性增益(或吸收)与非线性谱宽限制在自相似脉冲存在的范围内近似成线性比例关系,且脉冲的有效脉宽,功率,峰值振幅及能量的大小及增长速度也将随参数的变化而变化。相关结果将为实验中调节光纤放大器以及系统参数的选择提供一定的理论参考。
The fiber amplifier with high-order effects such as gain dispersion, gain saturation, third-order dispersion, self-steepness and self-frequency shift is taken as the research object. The conditions and transmission characteristics of the asymptotic parabolic self-similar pulse are discussed in detail. The results show that self-similar pulses of different amplitudes and pulse widths can be obtained under the condition of asymptotic constraint by choosing system parameters reasonably. In addition, the nonlinear gain (or absorption) and nonlinear spectral width are limited in the range of self-similar pulse Within the approximate linear relationship, and the pulse of the effective pulse width, power, peak amplitude and energy size and growth rate will also change with the parameters. The related results will provide some theoretical references for adjusting the optical fiber amplifier and the choice of system parameters in the experiment.