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Studying focal ratio degradation of optical fibers for Subaru's Prime Focus Spectrograph

机译：为斯巴鲁的Prime Focus光谱仪研究光纤的焦比降低

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Focal Ration Degradation (FRD) is a change in light’s angular distribution caused by fiber optics. FRD is important to fiber-fed, spectroscopic astronomical systems because it can cause loss of signal, degradation in spectral resolution, or increased complexity in spectrograph design. Laboratório Nacional de Astrofísica (LNA) has developed a system that can accurately and precisely measures FRD, using an absolute method that can also measure fiber throughput. This paper describes the metrology system and shows measurements of Polymicro’s fiber FBP129168190, FBP127165190 and Fujikura fiber 128170190. Although the FRD of the two fibers are low and similar to one another, it is very important to know the exact characteristics of these fibers since both will be used in the construction of FOCCoS (Fiber Optical Cable and Connectors System) for PFS (Prime Focus Spectrograph) to be installed at the Subaru telescope.
机译：焦距衰减（FRD）是由光纤引起的光线角度分布的变化。 FRD对光纤馈电的光谱天文系统很重要，因为它会导致信号丢失，光谱分辨率下降或光谱仪设计的复杂性增加。阿根廷国家实验室（LNA）开发了一种系统，该系统可以使用绝对方法来精确，精确地测量FRD，该方法还可以测量纤维通过量。本文介绍了度量衡系统，并显示了Polymicro光纤FBP129168190，FBP127165190和Fujikura光纤128170190的测量结果。尽管这两根光纤的FRD低且彼此相似，但是了解这两种光纤的确切特性非常重要，因为两者都会用于斯巴鲁望远镜安装的PFS（主要聚焦光谱仪）的FOCCoS（光纤电缆和连接器系统）的构造。

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