Controllable spatiotemporal nonlinear effects in multimode fibres
Controllable spatiotemporal nonlinear effects in multimode fibres
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DOI：
10.1038/nphoton.2015.61
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发表时间：
2015-05-01
期刊：
影响因子：
35
通讯作者：
Wise, Frank W.
中科院分区：
文献类型：
--
作者：
Wright, Logan G.;Christodoulides, Demetrios N.;Wise, Frank W.
多模光纤对于下一代电信系统和高能光纤激光器的构造是有意义的。然而，相对较少的工作，探讨了非线性脉冲在多模光纤中的传播。在这里，我们考虑梯度折射率多模光纤异常色散区中的高度非线性超短脉冲传播。低模式色散和光纤的许多空间模式之间的强非线性耦合导致有趣的行为。我们观察到时空效应，让人想起非线性光学在散装介质自聚焦和多重折射（1，2）-在一小部分的通常的权力。通过调整空间初始条件，我们产生了在1,550和2,200 nm之间可调的按需兆瓦级超短脉冲;超过一个倍频程的色散波;可见光的强梳;和多倍频程跨越超连续谱。我们的研究结果表明，多模光纤提供了独特的机会，观察新的时空动力学和现象。它们还能够实现一种新型的可调谐宽带光纤源，这对许多应用都很有用。
Multimode fibres are of interest for next-generation telecommunications systems and the construction of high-energy fibre lasers. However, relatively little work has explored nonlinear pulse propagation in multimode fibres. Here, we consider highly nonlinear ultrashort pulse propagation in the anomalous-dispersion regime of a graded-index multimode fibre. Low modal dispersion and strong nonlinear coupling between the fibre's many spatial modes result in interesting behaviour. We observe spatiotemporal effects reminiscent of nonlinear optics in bulk media-self-focusing and multiple filamentation(1,2)-at a fraction of the usual power. By adjusting the spatial initial conditions, we generate on-demand, megawatt, ultrashort pulses tunable between 1,550 and 2,200 nm; dispersive waves over one octave; intense combs of visible light; and a multi-octave-spanning supercontinuum. Our results indicate that multimode fibres present unique opportunities for observing new spatiotemporal dynamics and phenomena. They also enable the realization of a new type of tunable, broadband fibre source that could be useful for many applications.