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arXiv 1702.05583nlin.PSphysics.optics
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弱微扰线性物理系统中快双脉冲碰撞的类孤子行为

Soliton-like behavior in fast two-pulse collisions in weakly perturbed linear physical systems

Avner Peleg, Quan M. Nguyen, Toan T. Huynh

摘要:

我们证明了在非线性耗散的弱扰动下,线性物理系统的脉冲在快速碰撞中表现出类似孤子的行为。的行为表现为线性波导与弱立方损失和线性扩散平流模型描述的系统与弱二次损失。我们表明,在这两个系统中,由于非线性损耗的碰撞引起的振幅移动的表达式具有相同的形式,在弱立方损耗的存在下,两个光孤子之间的快速碰撞的振幅移动的表达式。我们的分析预测证实了相应的耦合线性演化模型与弱非线性损失的数值模拟。这些结果为研究任意空间维弱扰动线性物理系统脉冲间快速碰撞动力学开辟了道路。

英文摘要:

We demonstrate that pulses of linear physical systems, weakly perturbed by nonlinear dissipation, exhibit soliton-like behavior in fast collisions. The behavior is demonstrated for linear waveguides with weak cubic loss and for systems described by linear diffusion-advection models with weak quadratic loss. We show that in both systems, the expressions for the collision-induced amplitude shifts due to the nonlinear loss have the same form as the expression for the amplitude shift in a fast collision between two optical solitons in the presence of weak cubic loss. Our analytic predictions are confirmed by numerical simulations with the corresponding coupled linear evolution models with weak nonlinear loss. These results open the way for studying dynamics of fast collisions between pulses of weakly perturbed linear physical systems in an arbitrary spatial dimension.

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