Study on the Axial Strain Sensor of Birefringence Photonic Crystal Fiber Loop Mirror Based on the Absolute Integral of the Monitoring Peak
JIANG Ying1, 2, ZENG Jie1, LIANG Da-kai1*, WANG Xue-liang2, NI Xiao-yu2, ZHANG Xiao-yan1, LI Ji-feng1, LUO Wen-yong3
1. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China 2. School of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing 210037, China 3. Fiberhome Telecommunication Technologies Co. Ltd., Wuhan 430074, China
Abstract：In the present paper, the theoretical expression of the wavelength change and the axial strain of birefringence fiber loop mirror is developed. The theoretical result shows that the axial strain sensitivity of birefringence photonic crystal fiber loop mirror is much lower than conventional birefringence fiber loop mirror. It is difficult to measure the axial strain by monitoring the wavelength change of birefringence photonic crystal fiber loop mirror, and it is easy to cause the measurement error because the output spectrum is not perfectly smooth. The different strain spectrum of birefringence photonic crystal fiber loop mirror was measured experimentally by an optical spectrum analyzer. The measured spectrum was analysed. The results show that the absolute integral of the monitoring peak decreases with increasing strain and the absolute integral is linear versus strain. Based on the above results, it is proposed that the axial strain can be measured by monitoring the absolute integral of the monitoring peak in this paper. The absolute integral of the monitoring peak is a comprehensive index which can indicate the light intensity of different wavelength. This method of monitoring the absolute integral of the monitoring peak to measure the axial strain can not only overcome the difficulty of monitoring the wavelength change of birefringence photonic crystal fiber loop mirror, but also reduce the measurement error caused by the unsmooth output spectrum.
江 莺1, 2，曾 捷1，梁大开1*，汪学良2，倪晓宇2，章晓燕1，李继峰1，罗文勇3 . 基于监测波峰绝对积分的双折射光子晶体光纤环镜轴向应变传感器研究 [J]. 光谱学与光谱分析, 2013, 33(12): 3273-3277.
JIANG Ying1, 2, ZENG Jie1, LIANG Da-kai1*, WANG Xue-liang2, NI Xiao-yu2, ZHANG Xiao-yan1, LI Ji-feng1, LUO Wen-yong3. Study on the Axial Strain Sensor of Birefringence Photonic Crystal Fiber Loop Mirror Based on the Absolute Integral of the Monitoring Peak . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(12): 3273-3277.
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