A novel fiber-laser-based fiber Bragg grating strain sensor with high-birefringence Sagnac fiber loop mirror |
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| Authors: | Ou Xu Shaohua Lu Suchun Feng Shuisheng Jian |
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| Institution: | [1]Key Lab of All Optical Network and Advanced Telecommunication Network, Ministry of Education of China,Beijing Jiaotong University, Beijing 100044; [2]Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044 |
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| Abstract: | A novel fiber-laser-based strain sensor is proposed and experimentally demonstrated. The laser cavity is composed of a high-birefringence Sagnac fiber loop mirror (HiBi-SFLM) and a fiher Bragg grating (FBG) which also acts as a strain-sensing element. In the linear region of the HiBi-SFI,M reflection spectrum, when the strain applied on the FBG makes the Bragg grating wavelength shift,, the laser output power changes due to reflectivity variation of the HiBi-SFLM. Experimental results show that the laser output power varies ahnost linearly with the applied strain. The measurement of the output power can be performed by a conventional photo-detector. |
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