论文标题
使用模式选择光子灯笼在多模纤维链路上缓解局灶比率降解（FRD）
Focal-ratio-degradation (FRD) mitigation in a multimode fiber link using mode-selective photonic lanterns
论文作者
论文摘要
我们提出了一种新的方法来减轻局灶性比率降解（FRD）时，使用光纤传输多模光。我们的方法用六个不同的核心利用自定义的多核纤维（MCF），它们在〜1550 nm波长下是单个模式，并在7 m上以最小的耦合。我们在MCF的两端制造了绝热模式选择性光子灯笼（PLS），以创建具有多模端口的光纤链接，PLS将多模端口的每个空间模式耦合到MCF的特定核心，反之亦然。与传统的多模纤维相比，PL-MCF-PL链路表现出卓越的FRD行为，该纤维也支持6模式，因为它抑制了光从低阶模式转移到高阶模式。这些结果为减轻多模纤维链路的FRD提供了一种潜在强大的新方法，并在天文仪器中使用了特定的应用。
We present a new way to mitigate focal-ratio degradation (FRD) when using optical fibers to transport multimode light. Our approach exploits a custom multicore fiber (MCF) with six dissimilar cores that are single mode at ~1550 nm wavelength and minimally coupled over 7 m. We fabricated adiabatic mode-selective photonic lanterns (PLs) at each end of the MCF to create a fiber link with multimode ports, the PLs coupling each spatial mode of the multimode ports to a specific core of the MCF and vice versa. The PL-MCF-PL link exhibits superior FRD behavior compared to a conventional multimode fiber that also supports 6 modes, because it inhibits the transfer of light from lower-order modes to higher-order modes. These results open up a potentially powerful new approach to mitigate FRD in multimode fiber links, with particular applications in astronomical instruments.
