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arXiv 1004.3209nlin.PS
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关于optical fiber系统中调制不稳定性的发展

On the modulation instability development in optical fiber systems

Dmitry Agafontsev

摘要:

对光子晶体光纤中皮秒脉冲调制不稳定性发展的各个阶段进行了数值模拟:准孤子和色散波的形成、相互作用以及进一步的传播。比较了经典NLS方程、NLS方程加高阶色散项、NLS方程加高阶色散项和自陡项以及考虑Raman散射的完全广义NLS方程4种不同的类NLS方程。对于后一种情况,提出了能量从较小的准孤子转移到较大的准孤子的机制,以解释与不考虑拉曼散射时的系统相比,流氓波出现频率的急剧增加。

英文摘要:

Extensive numerical simulations were performed to investigate all stages of modulation instability development from the initial pulse of pico-second duration in photonic crystal fiber: quasi-solitons and dispersive waves formation, their interaction stage and the further propagation. Comparison between 4 different NLS-like systems was made: the classical NLS equation, NLS system plus higher dispersion terms, NLS plus higher dispersion and self-steepening and also fully generalized NLS equation with Raman scattering taken into account. For the latter case a mechanism of energy transfer from smaller quasi-solitons to the bigger ones is proposed to explain the dramatical increase of rogue waves appearance frequency in comparison to the systems when the Raman scattering is not taken into account.

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