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Soliton dynamics in an all-normal-dispersion photonic crystal fiber with frequency-dependent Kerr nonlinearity
Physical Review A ( IF 2.9 ) Pub Date : 2020-09-16 , DOI: 10.1103/physreva.102.033514
Saili Zhao , Xiaohong Sun

We explore high-order soliton evolution in a composite all-normal dispersion photonic crystal fiber with frequency-dependent doping nonlinearity that can vary from positive to negative and vanish at a specific wavelength, named the zero-nonlinearity wavelength (ZNW). The change in frequency dependence of doping nonlinearity dramatically adjusts the position of the ZNW and the nonlinear strength acting on the supercontinuum spectral component. As the negative (positive) frequency dependence decreases (increases), one of two generated fundamental solitons via the combined action of negative nonlinearity and normal dispersion first has a gradually boosting soliton self-frequency shift (SSFS), and then a more suppressed SSFS, but is finally limited within an increasingly small spectral range while the other has a gradually decreasing SSFS toward the ZNW and radiates a broader and stronger phase-matched dispersive wave (DW) in the nonsolitonic region. Note that the collision between two fundamental solitons plays a significant role in regulating their temporal and spectral shift as well as energy redistribution. Furthermore, the numeric sign of the frequency dependence of doping nonlinearity provides another potential tool in controlling the spectral shift direction of fundamental solitons and DWs.

中文翻译:

具有频率依赖性Kerr非线性的全正色散光子晶体光纤中的孤子动力学

我们探索具有频率依赖的掺杂非线性的复合全正常色散光子晶体光纤中的高阶孤子演化,该非线性可以从正变到负,并在称为零非线性波长(ZNW)的特定波长下消失。掺杂非线性的频率依赖性变化极大地调节了ZNW的位置和作用于超连续谱成分的非线性强度。随着负(正)频率相关性降低(增加),通过负非线性和正态色散的组合作用生成的两个基本孤子之一首先具有逐渐增强的孤子自频移(SSFS),然后被抑制得更多的SSFS,但是最终限制在越来越小的光谱范围内,而另一个则朝着ZNW方向逐渐减小SSFS,并在非孤子区域辐射出更宽,更强的相位匹配色散波(DW)。请注意,两个基本孤子之间的碰撞在调节它们的时间和光谱偏移以及能量重新分布方面起着重要作用。此外,掺杂非线性的频率依赖性的数字符号为控制基本孤子和DW的谱移方向提供了另一个潜在的工具。
更新日期:2020-09-16
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