Wepropose a design for coupled-core multi-core fibers that allows to achieve extremely low levels of modal dispersion. These fibers, which we dub NEar-zero MOdal-dispersion (NEMO) fibers, have an even number of cores regularly distributed on a circle, and the optimal design parameters follow from a simple condition independent of the number of cores. The modal-dispersion reduction trades off some of the fiber mode-mixing effectiveness, yet without compromising its beneficial property of mitigating nonlinear signal distortions. The semi-analytical tool developed for this study allows to effectively characterize the effect of various types of perturbations to the ideal fiber structure.

中文翻译：

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近零模态色散 (NEMO) 耦合芯多芯光纤


我们提出了一种耦合芯多芯光纤的设计，可以实现极低的模态色散水平。这些光纤被我们称为近零模色散 (NEMO) 光纤，具有偶数个纤芯，规则分布在圆周上，并且最佳设计参数来自与纤芯数量无关的简单条件。模色散的减少会牺牲一些光纤模式混合的有效性，但不会损害其减轻非线性信号失真的有益特性。为此研究开发的半分析工具可以有效地表征各种类型的扰动对理想纤维结构的影响。