| 光谱学与光谱分析 |
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| Measurement of Refractive Index with a PM-LPG Based Sagnac Loop Sensor |
| KANG Juan1,2, DONG Xin-yong1, ZHAO Chun-liu1, ZHANG Zai-xuan1, JIN Shang-zhong2 |
1. Institute of Optoelectronic Technology, China Jiliang University, Hangzhou 310018, China
2. School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China |
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Abstract By inscribing a long-period fiber grating (LPG) on a polarization-maintaining fiber (PMF), a fiber Sagnac loop sensor for simultaneous measurement of refractive index and temperature has been proposed and demonstrated. The LPG was fabricated on the PMF by using a CO2 laser, and then inserted into a fiber loop formed by using a normal single-mode fiber coupler. One of the transmission minimum of the Sagnac loop sensor was measured, whose wavelength varied with temperature and the intensity changed with refractive index. Temperature sensitivity of -0.654 nm·℃-1 and refractive sensitivity of 49.9 dB·RIU-1 have been achieved. The sensor system shows advantages of small size and low cost, and owns a good application prospect.
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Received: 2010-11-25
Accepted: 2011-02-26
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Corresponding Authors:
KANG Juan
E-mail: kangjuan@cjlu.edu.cn
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