Strain and curvature‐independent temperature sensor based on an interferometer taper fabricated with a CO2 laser

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ABSTRACTAn optical fiber interferometer taper fabricated with a CO2 laser is proposed for strain and curvature‐independent temperature measurement. Variations in temperature produce changes in the conditions of the interference between light traveling along the core and cladding and a linear behavior is verified for the relation between the wavelength of the resonant loss peak and temperature, yielding a sensitivity of 110 pm/°C for a range between 25 and 510°C. Both the applied strain and curvature only promote significant changes in the transmitted power, leaving the wavelength of the resonant loss peak approximately constant and rendering this optical sensing device a good strain and curvature‐independent temperature sensor. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:688–691, 2016