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22 August 2020 Fiber Bragg grating Fabry-Perot Interferometer in multicore fiber for refractive index measurements
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Abstract
A fiber optic refractive index sensor based on Fabry-Perot interferometer formed by two Chirped Fiber Bragg Gratings on a seven-core fiber is successfully demonstrated. A small part of the fiber cladding is etched to expose the outer 6 cores to the ambient environment. While optical modes supported by the outer 6-cores are affected by both temperature and refractive index changes of the surrounding liquid, the optical mode in the central core is affected by the temperature changes only. Because only a small part of the cladding is removed, the sensor maintains excellent mechanical strength and stability.
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Sema Güvenç Kılıç, Ufuk Kilic, Yupeng Zhu, Qiwen Sheng, Christos Argyropoulos, Mehmet Naci Inci, and Ming Han "Fiber Bragg grating Fabry-Perot Interferometer in multicore fiber for refractive index measurements", Proc. SPIE 11490, Interferometry XX, 114900Z (22 August 2020); https://doi.org/10.1117/12.2568796
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