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Interrogation Sensing Scheme Based on a Figure-of-Eight Fiber Loop Mirror

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7 Author(s)
Silva, R.M. ; Department of Physics and Astronomy, Faculty of Sciencse, University of Porto, Porto, Portugal ; Layeghi, A. ; Zibaii, M.I. ; Latifi, H.
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A fiber optic interrogation sensor scheme based on a “figure-of-eight” configuration created from a single directional 3 $,times,$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 $6.7pm 4.38times 10^{-2}~{rm mrad/}mu{rm strain}$ by linear regression.

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Photonics Technology Letters, IEEE  (Volume:25 ,  Issue: 8 )