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Optically Heated Long-Period Grating as Temperature-Insensitive Fiber-Optic Refractive-Index Sensor

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3 Author(s)
Yebin Zhang ; State Key Lab. of Modern Opt. Instrum., Zhejiang Univ., Hangzhou, China ; Shaorui Gao ; Zhang, A.P.

A temperature-insensitive fiber-optic refractive-index sensor based on optically heated long-period grating (LPG) is presented. The LPG is manufactured in a short section of cobalt-doped optical fiber (COF), which can be thermally stabilized through a pump light. Two fiber Bragg gratings (FBGs) are manufactured in COF and single-mode fiber (SMF), respectively, to monitor the local sensor and surrounding medium temperature. Experimental results demonstrate that this fiber-grating-based miniature refractive-index sensor can efficiently eliminate temperature cross-sensitivity in the temperature range of 5~60°C.

Published in:

Photonics Journal, IEEE  (Volume:4 ,  Issue: 6 )

Date of Publication:

Dec. 2012

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