Belhadj N, Park Y, Larochelle S, Dossou K, Azaña J
Centre d'optique, photonique et laser (COPL), Département de génie électrique et de génie informatique, Université Laval, Québec (Québec) Canada.
Opt Express. 2008 Jun 9;16(12):8727-41. doi: 10.1364/oe.16.008727.
This paper discusses the importance of stress-induced contributions to the photo-induced birefringence observed in fiber Bragg gratings. Optical tomography measurements are performed in exposed and unexposed fibers to extract the stress profiles induced by UV-writing of fiber Bragg gratings for various exposure levels. A photoelastic analysis and a high-order isoparametric finite elements method are then used to calculate the birefringence caused by stress profile modifications. The results are compared to the birefringence directly measured by spectral analysis of a chirped fiber grating with multiple phase-shifts. We can therefore estimate the fraction of the photo-induced birefringence due to stress-induced anisotropy following UV exposure.
本文讨论了应力诱导对光纤布拉格光栅中光致双折射的贡献的重要性。对暴露和未暴露的光纤进行光学层析成像测量，以提取在不同曝光水平下光纤布拉格光栅紫外写入所诱导的应力分布。然后使用光弹性分析和高阶等参有限元方法来计算由应力分布变化引起的双折射。将结果与通过具有多个相移的啁啾光纤光栅的光谱分析直接测量的双折射进行比较。因此，我们可以估算出紫外曝光后由于应力诱导各向异性而导致的光致双折射的比例。
