Sun Yizhi, Liu Qi, Deng Haoping, Sheng Yulin, Gao Shoufei, Wang Yingying, Ding Wei
Opt Express. 2024 Feb 26;32(5):8059-8068. doi: 10.1364/OE.515584.
A novel technique referred to as optical side leakage radiometry is proposed and experimentally demonstrated for non-destructive and distributed characterization of anti-resonant hollow-core optical fibers with high spatial resolution. Through in-depth analysis of the leakage light collection, we discover a unique polarization dependence, which is validated by our experiment. By leveraging this effect and employing Fourier filtering, this method enables accurate quantification of propagation attenuations for fundamental and higher order modes (with the uncertainty of <1 dB/km), identification of localized defects (with the resolution of ∼5 cm), and measurement of ultra-low spectral phase birefringence (at the level of 10) in two in-house-fabricated nested antiresonant nodeless hollow-core fibers. Such a fiber characterization approach, boasting unprecedently high accuracy and a potentially wide dynamic range, holds the potential to become an indispensable diagnosis tool for monitoring and assisting the manufacture of high-quality anti-resonant hollow-core fiber.
提出了一种称为光学侧面泄漏辐射测量的新技术，并通过实验证明了该技术可用于对具有高空间分辨率的反谐振空心光纤进行无损和分布式表征。通过对泄漏光收集的深入分析，我们发现了一种独特的偏振依赖性，这在我们的实验中得到了验证。利用这种效应并采用傅里叶滤波，该方法能够准确量化基模和高阶模的传播衰减（不确定度<1 dB/km），识别局部缺陷（分辨率约为5 cm），并测量两根自制的嵌套反谐振无节点空心光纤中的超低光谱相位双折射（水平为10）。这种光纤表征方法具有前所未有的高精度和潜在的宽动态范围，有望成为监测和辅助高质量反谐振空心光纤制造的不可或缺的诊断工具。
