基于全固光子带隙光纤的传感器的特性研究

为了实现对基于全固光子带隙光纤（AS-PBF）的传感器的特性研究，采用了双锥型模式干涉仪的结构，使用熔接机在一根AS-PBF上间隔一段距离制作两个锥形光纤，制备出一种基于双锥型模式干涉的特种光纤传感器。与传统单模光纤或折射率传导的光子晶体不同，AS-PBF的纤芯有效折射率较低，而包层有效折射率较高。通过理论分析和实验验证，测量研究了这种光纤结构对温度和轴向应力的响应。实验结果表明，温度灵敏度和轴向应力灵敏度分别为~63pm/oC和~-1.74nm/ N。与长周期光栅、布拉格光栅相比，基于全固带隙光纤的双锥型模式干涉传感器具有制备简单、结构紧凑等优势，在光纤传感领域具有广泛的应用前景。

Characteristics of sensors based on all-solid-state photonic bandgap fiber

In order to realize the sensor based on all-solid bandgap optical fiber, a mode interferometer based on two-taper structure was introduced. Using a splicer to fabricate an all-solid photonic bandgap fiber modal interferometer by concatenating two tapers separated with a middle section of the fiber. Compared to the conventional fibers or the index-guiding photonic crystal fibers as previously presented, the all-solid bandgap optical fiber have a lower effective index in the core and a higher effective index in the cladding. According to the theoretical analysis and experimental verification, we measured the temperature response and the axial stress response of our structure. The measured sensing sensitivities are~63pm/oC for temperarure and ~-1.74nm/N for the axial stress, respectively. The Analysis shows that a two-tapers modal interferometer based on all-solid photonic bandgap fiber has a much compact device size and a simple fabrication compared to the long-period grating and the Bragg grating, which has wide range of potential applications in optical sensing fields.