Silva, Ricardo M.Layeghi, A.Zibaii, M. I.Latifi, HamidSantos, Jose LuisLobo Ribeiro, Antonio B.Frazao, Orlando2019-09-162019-09-1620131041-1135http://hdl.handle.net/10284/7913A fiber optic interrogation sensor scheme based on a “figure-of-eight” configuration created from a single directional 3 × 3 fiber optic coupler is proposed. Two loops are formed in each arm and one of them contains the sensing head and the other is used as reference signal. A theoretical study based on Jones matrix analysis of this fiber loop mirror combination is reported. The optical configuration is tested as an interrogation scheme for a fiber strain sensor where the spectral response arises from the combination of the reference signal modulated by the sensor signal. The strain sensor configuration shows a phase sensitivity of 6.7 ± 4.38 × 10−2 mrad/μstrain by linear regression.engOptical fiber sensorsOptical fiber polarizationOptical fiber couplersStrainCouplersOptical interferometryjournal article10.1109/LPT.2013.2248708