Focal-ratio degradation (FRD) mitigation in a multimode fibre link using mode-selective photonic lanterns
Focal-ratio degradation (FRD) mitigation in a multimode fibre link using mode-selective photonic lanterns
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DOI：
10.1093/mnras/staa3904
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发表时间：
2020-04
期刊：
影响因子：
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通讯作者：
A. Benoît;S. Yerolatsitis;K. Harrington;T. Birks;R. Thomson
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文献类型：
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作者：
A. Benoît;S. Yerolatsitis;K. Harrington;T. Birks;R. Thomson
我们提出了一种新的方法来减轻焦距比退化（FRD）时，使用光纤传输多模光。我们的方法利用了一个定制的多芯光纤（MCF）与六个不同的核心是单模在~1550 nm波长和最小耦合超过7米。我们在MCF的每一端制造绝热模式选择光子灯笼（PL）以创建具有多模端口的光纤链路，PL将多模端口的每个空间模式耦合到MCF的特定芯，反之亦然。PL-MCF-PL链路与也支持6种模式的常规多模光纤相比表现出上级FRD行为，因为它抑制了光从低阶模式到高阶模式的传输。这些结果开辟了一个潜在的强大的新方法，以减轻FRD在多模光纤链路，特别是在天文仪器的应用。
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.