Zhao Zhiyuan, Li Xinruo, Yan Shihao, Tian Ke, Wang Xin, Zhao Haiyan, Lewis Elfed, Farrell Gerald, Wang Pengfei
Opt Lett. 2024 Mar 1;49(5):1329-1332. doi: 10.1364/OL.519450.
In this Letter, we demonstrate a sensitivity-enhanced strain sensor based on a shape-modulated multimode fiber (MMF). In contrast to conventional single-mode-multimode-single-mode (SMS) fiber structures, which typically contain a single cylindrical homogeneous MMF section, the shape of the MMF section in this investigation is modulated by lateral offset splicing of multiple MMF segments. Simulation results show that the designed shape-modulated MMF has a higher peak mechanical strain than that of a cylindrical MMF. Experimental results demonstrate that the strain sensitivity achieved by the shaped-modulated MMF-formed SMS fiber structure is as high as -55.63 pm/µε, which is 33 times higher than that for a cylindrical MMF-formed conventional SMS fiber structure at -1.65 pm/µε. This high sensitivity and low-fabrication cost SMS fiber sensor has the potential to be a promising candidate in precise strain measurement applications.
在本信函中，我们展示了一种基于形状调制多模光纤（MMF）的灵敏度增强型应变传感器。与传统的单模-多模-单模（SMS）光纤结构不同，传统结构通常包含单个圆柱形均匀MMF段，而本研究中MMF段的形状是通过多个MMF段的横向偏移拼接来调制的。仿真结果表明，所设计的形状调制MMF比圆柱形MMF具有更高的峰值机械应变。实验结果表明，由形状调制MMF形成的SMS光纤结构实现的应变灵敏度高达-55.63 pm/με，这比圆柱形MMF形成的传统SMS光纤结构在-1.65 pm/με时的应变灵敏度高33倍。这种高灵敏度且低成本的SMS光纤传感器在精确应变测量应用中有望成为有前途的候选者。
