为了研究孤子脉冲经掺铒光纤放大器演变后的啁啾特性,采用了对称分步傅里叶的数值方法,对孤子脉冲在不同增益条件下的演变和线性啁啾特性进行了数值仿真.数值计算的结果表明:当满足增益系数μ远大于1时,基孤子脉冲在放大器中传输能够获得很好的线性啁啾,且发现脉冲的啁啾特性受选取的放大器长度参量的影响;啁啾越明显的脉冲,线性啁啾所占的区域越窄.进一步讨论了一般孤子脉冲演变后的啁啾特性,发现初始啁啾系数和孤子阶数对脉冲获得的线性啁啾均有很大影响,初始正啁啾系数和高孤子阶数均能增强输出脉冲的线性啁啾特性.利用孤子脉冲在掺铒光纤放大器中传输的非线性效应能够获得良好的线性啁啾,这对实现高质量的脉冲压缩是很有帮助的.
Using the symmetrical split-step Fourior method, the evolution and linear chirp of the fundemental soliton under different gain parameters are numerically investigated in the erbium-doped fiber amplifier. The results show that when the gain parameter μ＞＞1, the linear chirp can be generated after the fundemental soliton propagates along the fiber amplifier, and it's found that the chirp characteristics are influenced by the fiber length. Meanwhile the part with linear chirp for the pulse is narrower if the chirp is more obvious. Moreover, further study found that the initial positive chirp parameter and the high soliton orders have an obvious and active effect on the linear chirp, which strengthens the pulse linear chirp. So the linear chirp can be generated by use of the nonlinear effects, when the fundemental soliton propagates along the erbium-doped fiber amplifier, which has an impact on pulse compression.
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