Phan Huy Minh Châu, Laffont Guillaume, Dewynter Véronique, Ferdinand Pierre, Roy Philippe, Auguste Jean-Louis, Pagnoux Dominique, Blanc Wilfried, Dussardier Bernard
Comissariat à l'Energie Atomique LIST, Centre d'Etudes de Saclay, 91191 Gif-sur-Yvette Cedex, France.
Opt Lett. 2007 Aug 15;32(16):2390-2. doi: 10.1364/ol.32.002390.
We present a photosensitive three-hole microstructured optical fiber specifically designed to improve the refractive index sensitivity of a standard fiber Bragg grating (FBG) sensor photowritten in the suspended Ge-doped silica core. We describe the specific photowriting procedure used to realize gratings in such a fiber. We then determine their spectral sensitivity to the refractive index changes of material filling the holes surrounding the core. The sensitivity is compared with that of standard FBGs photowritten in a six-hole fiber with a larger core diameter. We demonstrate an improvement in the sensitivity by two orders of magnitude and reach a resolution of 3 x 10(-5) and 6 x 10(-6) around mean refractive index values of 1.33 and 1.40, respectively.
我们展示了一种光敏三孔微结构光纤，其专门设计用于提高在悬浮的掺锗二氧化硅纤芯中光写入的标准光纤布拉格光栅（FBG）传感器的折射率灵敏度。我们描述了用于在这种光纤中实现光栅的特定光写入过程。然后，我们确定了它们对填充纤芯周围孔的材料的折射率变化的光谱灵敏度。将该灵敏度与在具有较大纤芯直径的六孔光纤中光写入的标准FBG的灵敏度进行了比较。我们证明灵敏度提高了两个数量级，并且在平均折射率值分别为1.33和1.40附近达到了3×10⁻⁵和6×10⁻⁶的分辨率。
