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arXiv 1502.00915physics.optics
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超短光孤子在确定性和随机非线性立方介质中的传输模型

Modeling of Ultra-Short Soliton Propagation in Deterministic and Stochastic Nonlinear Cubic Media

Levent Kurt

摘要:

本文研究了确定性和随机环境下的短脉冲动力学。可积短脉冲方程是研究超短脉冲在光纤中红外波段传输的模型方程。研究了短脉冲方程精确孤波解的数值证明。此外,我们证明了短脉冲孤子近似的麦克斯韦方程的解的数值。我们的数值实验证明了短脉冲孤子的类粒子行为。在此基础上,我们导出了高阶的短脉冲方程。一个随机对应的短脉冲方程也来自通过使用多尺度扩展方法,更现实的情况下,随机扰动的色散存在。数值计算表明,即使在随机性存在的情况下,短脉冲孤立波仍然存在。数值计算结果表明,在慢尺度上短脉冲方程的粗粒化噪声统计和在快尺度上非线性波方程的微观噪声统计具有较好的精度。

英文摘要:

We study the short pulse dynamics in the deterministic and stochastic environment in this thesis. The integrable short pulse equation is a modelling equation for ultra-short pulse propagation in the infrared range in the optical fibers. We investigate the numerical proof for the exact solitary solution of the short pulse equation. Moreover, we demonstrate that the short pulse solitons approximate the solution of the Maxwell equation numerically. Our numerical experiments prove the particle-like behaviour of the short pulse solitons. Furthermore, we derive a short pulse equation in the higher order. A stochastic counterpart of the short pulse equation is also derived through the use of the multiple scale expansion method for more realistic situations where stochastic perturbations in the dispersion are present. We numerically show that the short pulse solitary waves persist even in the presence of the randomness. The numerical schemes developed demonstrate that the statistics of the coarse-graining noise of the short pulse equation over the slow scale, and the microscopic noise of the nonlinear wave equation over the fast scale, agree to fairly good accuracy.

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