Anti-dark and Mexican-hat solitons in the Sasa-Satsuma equation on the continuous wave background

Anti-dark and Mexican-hat solitons in the Sasa-Satsuma equation on the continuous wave background
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连续波背景Sasa-Satsuma方程中的反暗孤子和墨西哥帽孤子

DOI:
10.1209/0295-5075/109/30006
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发表时间:
2014-08
期刊:
Europhysics Letters
影响因子:
--
通讯作者:
Lu Li
Lu Li
中科院分区:
其他
文献类型:
--
作者:
Tao Xu;Min Li;Lu Li

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本文通过达布变换方法,构造了描述飞秒脉冲在单模光纤中传输的SASA-SATSUMA方程的新的解析孤子解。我们发现在连续波(CW)背景下可以形成两种不同类型的飞秒孤子,即反暗(AD)和墨西哥帽(MH)孤子,并数值研究了它们在小初始扰动下的稳定性。与常见的亮孤子和暗孤子不同,AD孤子和MH孤子既可以表现出共振相互作用,也可以表现出弹性相互作用,以及由这两种基本相互作用组成的各种部分/完全非弹性相互作用。此外,我们还发现一些相互作用的孤子与CW背景之间的能量交换可能导致一个AD孤子转变为MH孤子,或一个MH孤子转变为AD孤子。
In this letter, via the Darboux transformation method we construct new analytic soliton solutions for the Sasa-Satsuma equation which describes the femtosecond pulses propagation in a monomode fiber. We reveal that two different types of femtosecond solitons, i.e., the anti-dark (AD) and Mexican-hat (MH) solitons, can form on a continuous wave (CW) background, and numerically study their stability under small initial perturbations. Different from the common bright and dark solitons, the AD and MH solitons can exhibit both the resonant and elastic interactions, as well as various partially/completely inelastic interactions which are composed of such two fundamental interactions. In addition, we find that the energy exchange between some interacting soliton and the CW background may lead to one AD soliton changing into an MH one, or one MH soliton into an AD one.
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