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Journal of Modern Optics Volume 65, 2018 - Issue 9
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Articles

Refractive index and temperature sensors based on no-core fiber cascaded with long period fiber grating

Jianming ZhangCollege of Science, University of Shanghai for Science and Technology, Shanghai, China
,
Shengli PuCollege of Science, University of Shanghai for Science and Technology, Shanghai, China;Shanghai Key Laboratory of Modern Optical System, University of Shanghai for Science and Technology, Shanghai, ChinaCorrespondence[email protected]
,
Jie RaoCollege of Science, University of Shanghai for Science and Technology, Shanghai, China
&
Tianjun YaoCollege of Science, University of Shanghai for Science and Technology, Shanghai, China
Pages 1098-1103 | Received 30 Sep 2017, Accepted 28 Dec 2017, Published online: 19 Jan 2018
 
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Abstract

A kind of compact fibre-optic sensor based on no-core fibre (NCF) cascaded with a strong coupling long-period fibre grating (LPFG) is proposed and experimentally demonstrated. The sensing mechanism is based on the Mach–Zehnder-like interference between the core fundamental mode and cladding mode of the fibre structure. The NCF and LPFG are used as the mode exciter and combiner, respectively. Due to the particular properties of the strong coupling LPFG, the measurements of refractive index (RI) and temperature with high sensitivity are realized by monitoring the transmission spectrum with intensity and wavelength interrogation techniques, respectively. The achieved RI sensitivity reaches −580.269 dB/RIU in the range of 1.436–1.454 and the temperature sensitivity reaches 27.2 pm/°C.

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