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Optical Engineering

Inline fiber interference-based refractive-index sensor
Author(s): Zhenfeng Gong; Xinpu Zhang; Yun Liu; Zigeng Liu; Qingxu Yu; Wei Peng
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Paper Abstract

We report two fiber multiple-mode interferometers formed in photonic crystal fiber (PCF). The interference between the core and the cladding modes of a PCF is utilized. We use two methods to form a coupling point, and the cladding modes are excited from the fundamental core mode. One method is blowing compressed gas into the air holes and discharging at the coupling point; the air holes will expand due to gas expansion in the discharge process. Similarly, the other is discharging at the coupling point after the air is exhausted from the air holes, and the holes will contract during the process. By making another coupling point at a different location along the fiber, the proposed PCF interferometers are implemented. Experimental results show that the sensitivities of the two devices can achieve 1.54 and 1.45 nm for a 0.01 refractive index change.

Paper Details

Date Published: 11 November 2014
PDF: 5 pages
Opt. Eng. 53(11) 117106 doi: 10.1117/1.OE.53.11.117106
Published in: Optical Engineering Volume 53, Issue 11
Show Author Affiliations
Zhenfeng Gong, Dalian Univ. of Technology (China)
Xinpu Zhang, Dalian Univ. of Technology (China)
Yun Liu, Dalian Univ. of Technology (China)
Zigeng Liu, Dalian Univ. of Technology (China)
Qingxu Yu, Dalian Univ. of Technology (China)
Wei Peng, Dalian Univ. of Technology (China)

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