发表机构
University of Toronto; David A. Dunlap Department of Astronomy and Astrophysics, University of Toronto; Dunlap Institute for Astronomy and Astrophysics, University of Toronto（多伦多大学; 多伦多大学戴维·A·邓普天文学与天体物理学系; 多伦多大学邓普天文学与天体物理研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
针对未来大规模光谱巡天设施中超过25,000根光纤的测试需求，本文提出一种自动化多应力光纤表征平台，可同时测量焦比退化与相对吞吐量，并验证了其分辨应力相关变化的能力，为大规模光纤表征提供了可扩展框架。
AI 中文摘要
未来的光谱巡天设施，如Spec-S5和宽视场光谱望远镜（WST），将包含超过25,000根光纤。表征这些光纤的焦比退化（FRD）和吞吐量对于光谱定标、天光扣除以及整体仪器性能至关重要，但人工测试如此大规模的光纤群体极其耗时。在本工作中，我们提出了一种自动化的多应力光纤表征平台，能够在系统性地改变光学和机械应力条件的同时，测量FRD和相对吞吐量。该系统能够表征作为入射角、波长、弯曲半径、扭转角度和外加负载的函数的光纤性能，同时允许同时研究多种应力的组合。一个定制的软件框架实现了硬件控制、数据采集和数据分析的自动化，使得大规模表征活动能够在最少的人工干预下进行。在多模光纤上进行的验证测量表明，该平台能够分辨FRD和相对吞吐量中显著且细微的应力相关变化。结果显示了FRD对入射角和弯曲半径的预期依赖性，揭示了在所研究的条件下对外加压缩载荷的敏感性相对较弱，并识别出对光纤扭转角度的可重复的周期性依赖性。此外，相对吞吐量测量表明，随着入射角增加而导致的相对吞吐量减少不能仅用简单的投影面积模型来解释。该系统的自动化工作流程和可扩展性为下一代光谱巡天设施所需的大规模光纤表征提供了一个通用的框架。
英文摘要
Future spectroscopic survey facilities such as Spec-S5 and the Wide-Field Spectroscopic Telescope (WST) will contain more than 25,000 optical fibers. Characterizing the focal ratio degradation (FRD) and throughput of these fibers is essential for spectroscopic calibration, sky subtraction, and overall instrument performance, but manual testing of such large fiber populations is prohibitively time-consuming. In this work, we present an automated multi-stressor optical fiber characterization platform capable of measuring both FRD and relative throughput while systematically varying optical and mechanical stress conditions. The system enables characterization as a function of input angle, wavelength, bend radius, twist angle, and externally applied load, while also allowing combinations of stressors to be investigated simultaneously. A custom software framework automates hardware control, data acquisition, and data analysis, enabling large characterization campaigns to be performed with minimal user intervention. Validation measurements performed on a multimode optical fiber demonstrate the ability of the platform to resolve both pronounced and subtle stress-dependent variations in FRD and relative throughput. The results show the expected dependence of FRD on input angle and bend radius, reveal comparatively weak sensitivity to externally applied compressive loading under the investigated conditions, and identify a reproducible periodic dependence on fiber twist angle. In addition, relative throughput measurements indicate that the reduction in relative throughput with increasing input angle cannot be explained solely by a simple projected-area model. The automated workflow and scalability of the system provide a versatile framework for the large-scale characterization of optical fibers required by next-generation spectroscopic survey facilities.
Comments19 pages, 16 figures, SPIE Astronomical Telescopes + Instrumentation 2026 Conference
Journal refProc. SPIE 14154, 141548M (2026)
