发表机构
Georgia State University; University of Michigan; European Southern Observatory; Observatoire de Paris（佐治亚州立大学; 密歇根大学; 欧洲南方天文台; 巴黎天文台）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
针对干涉测量中光纤传输路径长度受热影响的问题，提出用复合电缆结合电阻测量与白光干涉实现长单模光纤路径长度均衡与色散控制。
AI 中文摘要
在光学干涉测量中，使用单模（SM）光纤进行光束传输相比传统的长真空管道具有实际优势。光纤传输面临的一个挑战是在环境热变化可导致昼夜厘米级变化的条件下保持恒定的差分路径长度。我们制作了三根长度为470米的复合电缆，每根包含4根铜线和3根工作在天文H波段（1500-1800 nm）的单模光纤。多根光纤使我们能够测试圆形纤芯光纤（SMF28）、熊猫型保偏（PM）光纤以及特种色散补偿保偏光纤的性能。我们将展示使用复合电缆光束传输系统的精密电阻测量得到的实验结果。我们发现，在470米电缆上施加1200 W功率会导致空气中的光程差变化75毫米（±2毫米），电阻从5.36欧姆变化到5.50欧姆。此外，我们展示了使用白光干涉条纹（λc=1575 nm，Δλ=75 nm）通过我们的方法控制470米光纤在单一偏振方向上的色散。
英文摘要
The ability to use single mode (SM) fibers for beam transport in optical interferometry offers practical advantages over conventional long vacuum pipes. One challenge facing fiber transport is maintaining constant differential path length in an environment where environmental thermal variations can lead to cm-level variations from day to night. We have fabricated three composite cables of length 470 m, each containing 4 copper wires and 3 SM fibers that operate at the astronomical H band (1500-1800 nm). Multiple fibers allow us to test performance of a circular core fiber (SMF28), a panda-style polarization-maintaining (PM) fiber, and a lastly a specialty dispersion-compensated PM fiber. We will present experimental results using precision electrical resistance measurements of the of a composite cable beam transport system. We find that the application of 1200 W over a 470 m cable causes the optical path difference in air to change by 75 mm (+/- 2 mm) and the resistance to change from 5.36 to 5.50 Ω. Additionally, we show control of the dispersion of 470 m of fiber in a single polarization using white light interference fringes (λc=1575 nm, Δλ=75 nm) using our method.
CommentsThis is a preprint of a paper originally published in Proceedings of SPIE in 2014. 11 pages, 11 figures
Journal refProc. SPIE 9146, 91461L (2014) Proc. SPIE 9146, 91461L (2014) Proc. SPIE 9146, 91461L (2014) Proc. SPIE 9146, 91461L (2014) Proc. SPIE 9146, 91461L (2014)
