Refractive index sensing characteristic of single-mode-multimode-single-mode fiber structure based on self-imaging effect

Xuekun Bai; Haotian Wang; Shaofei Wang; Shengli Pu; Xianglong Zeng

doi:10.1117/1.OE.54.10.106103

13 October 2015 Refractive index sensing characteristic of single-mode-multimode-single-mode fiber structure based on self-imaging effect

Xuekun Bai, Haotian Wang, Shaofei Wang, Shengli Pu, Xianglong Zeng

Author Affiliations +

Funded by: Natural Science Foundation of China

Optical Engineering, Vol. 54, Issue 10, 106103 (October 2015). https://doi.org/10.1117/1.OE.54.10.106103

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.

Citation Download Citation

Xuekun Bai, Haotian Wang, Shaofei Wang, Shengli Pu, and Xianglong Zeng "Refractive index sensing characteristic of single-mode-multimode-single-mode fiber structure based on self-imaging effect," Optical Engineering 54(10), 106103 (13 October 2015). https://doi.org/10.1117/1.OE.54.10.106103

Published: 13 October 2015

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