Lasers, Fiber Optics, and Communications

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

[+] Author Affiliations
Xuekun Bai, Shaofei Wang, Xianglong Zeng

Shanghai University, Key Laboratory of Specialty Fiber Optics and Optical Access Network, Shanghai 200072, China

Haotian Wang, Shengli Pu

University of Shanghai for Science and Technology, College of Science, Shanghai 200093, China

Opt. Eng. 54(10), 106103 (Oct 13, 2015). doi:10.1117/1.OE.54.10.106103
History: Received August 5, 2015; Accepted September 14, 2015
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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 1923nm/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.

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© 2015 Society of Photo-Optical Instrumentation Engineers

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", Opt. Eng. 54(10), 106103 (Oct 13, 2015). ; http://dx.doi.org/10.1117/1.OE.54.10.106103


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