High-Sensitivity Temperature Sensor Based on Polarization Maintaining Fiber Sagnac Loop
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A high-sensitivity all-fiber temperature sensor based on a Sagnac interferometer is demonstrated by splicing a section of polarization maintaining fiber (PMF) between two sections of standard single mode fibers (SMFs). In this sensor, the SMF-PMF-SMF structure in the Sagnac loop is bent into a circle to enhance the sensitivity. The length and curvature of the PMF in the loop are investigated and can be optimized to further increase the temperature sensitivity of the sensor. Results show that the radius of the circle has an important effect upon temperature sensitivity due to the bend-induced birefringence variation of the PMF. The SMF-PMF-SMF structure bent into a circle with a radius of 30 mm exhibits a high-sensitivity temperature of 1.73 nm/°C. The sensor is provided with the advantages of easy fabrication, low-insertion loss, and high sensitivity, which may find potential applications in the field of high precision temperature measurement.
KeywordsOptical fiber sensor polarization maintaining fiber temperature sensor Sagnac loop
This work was supported by the National Natural Science Foundation of China (NSFC) (Grant Nos. 61425007 and 61635007); Guangdong Natural Science Foundation (Grant Nos. 2015B010105007 and 2014A030308007); Science and Technology Innovation Commission of Shenzhen (Grant Nos. JCYJ20170412105604705 and JCYJ20160427104925452); Development and Reform Commission of Shenzhen Municipality Foundation; the National Natural Science Foundation of China (Grant No. 61565002); Guangxi Province Key Research and Development Program (Grant No. AB171129027).
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