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Optical Engineering

Refractive index sensing characteristic of single-mode-multimode-single-mode fiber structure based on self-imaging effect
Author(s): Xuekun Bai; Haotian Wang; Shaofei Wang; Shengli Pu; Xianglong Zeng
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Paper 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.

Paper Details

Date Published: 13 October 2015
PDF: 6 pages
Opt. Eng. 54(10) 106103 doi: 10.1117/1.OE.54.10.106103
Published in: Optical Engineering Volume 54, Issue 10
Show Author Affiliations
Xuekun Bai, Shanghai Univ. (China)
Haotian Wang, Univ. of Shanghai for Science and Technology (China)
Shaofei Wang, Shanghai Univ. (China)
Shengli Pu, Univ. of Shanghai for Science and Technology (China)
Xianglong Zeng, Shanghai Univ. (China)

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