Refractive index sensing characteristic of single-mode-multimode-single-mode fiber structure based on self-imaging effect
Refractive index sensing characteristic of single-mode-multimode-single-mode fiber structure based on self-imaging effect
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DOI：
10.1117/1.oe.54.10.106103
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发表时间：
2015-10
影响因子：
1.3
通讯作者：
Xuekun Bai;Haotian Wang;Shaofei Wang;Shengli Pu;Xianglong Zeng
中科院分区：
文献类型：
--
作者：
Xuekun Bai;Haotian Wang;Shaofei Wang;Shengli Pu;Xianglong Zeng
抽象。对单模-多模-单模（SMS）光纤结构中自成像效应引起的带通光谱折射率传感特性进行了理论和实验研究。新的可选参数，即，无芯光纤（NCF）长度，以提高传感器的灵敏度。结果表明，在保持自成像数不变的情况下，缩短NCF长度可以提高传感器的灵敏度。实验上，当折射率在1.334 ~ 1.434范围内时，灵敏度达到1923 nm/RIU（折射率单位）。本工作展示了一种方法，以提高灵敏度的SMS光纤结构的RI传感器具有成本低，体积小，插入损耗低，高灵敏度的光纤RI传感器。
Abstract. We research the refractive index (RI) sensing characteristic based on the bandpass spectrum caused by the self-imaging effect in the single-mode-multimode-single-mode (SMS) fiber structure theoretically and experimentally. A new selectable parameter, i.e., no-core fiber (NCF) length, is investigated for improving the sensitivity of the sensor. The results show that the sensor’s sensitivity will be enhanced by shortening the NCF length when the self-imaging number remains constant. Experimentally, a maximum sensitivity of 1923 nm/RIU (RI unit) has been achieved when the RI ranges from 1.334 to 1.434. This work demonstrates a method to improve the sensitivity of SMS-fiber-structure-based RI sensors featuring a low cost, compact size, low insert loss, and high sensitivity optical fiber RI sensor.