Eftekhar M A, Sanjabi-Eznaveh Z, Lopez-Aviles H E, Benis S, Antonio-Lopez J E, Kolesik M, Wise F, Amezcua-Correa R, Christodoulides D N
CREOL, College of Optics and Photonics, University of Central Florida, Orlando, FL, 32816-2700, USA.
The College of Optical Sciences, The University of Arizona, Tucson, AZ, 85721, USA.
Nat Commun. 2019 Apr 9;10(1):1638. doi: 10.1038/s41467-019-09687-9.
Multimode optical fibers have recently reemerged as a viable platform for addressing a number of long-standing issues associated with information bandwidth requirements and power-handling capabilities. As shown in recent studies, the complex nature of such heavily multimoded systems can be effectively exploited to observe altogether novel physical effects arising from spatiotemporal and intermodal linear and nonlinear processes. Here, we study for the first time, accelerated nonlinear intermodal interactions in core-diameter decreasing multimode fibers. We demonstrate that in the anomalous dispersion region, this spatiotemporal acceleration can lead to relatively blue-shifted multimode solitons and blue-drifting dispersive wave combs, while in the normal domain, to a notably flat and uniform supercontinuum, extending over 2.5 octaves. Our results pave the way towards a deeper understanding of the physics and complexity of nonlinear, heavily multimoded optical systems, and could lead to highly tunable optical sources with very high spectral densities.
多模光纤最近再度成为一个可行的平台，可用于解决一些与信息带宽需求和功率处理能力相关的长期存在的问题。如最近的研究所示，这种高度多模系统的复杂特性可被有效利用，以观测到完全源于时空和模间线性及非线性过程的全新物理效应。在此，我们首次研究了纤芯直径减小的多模光纤中加速的非线性模间相互作用。我们证明，在反常色散区域，这种时空加速可导致相对蓝移的多模孤子和蓝移色散波梳，而在正常区域，则可产生显著平坦且均匀的超连续谱，其扩展超过2.5个倍频程。我们的结果为更深入理解非线性、高度多模光学系统的物理特性和复杂性铺平了道路，并可能带来具有非常高光谱密度的高度可调谐光源。
