Abstract

This study proposes a high-temperature sensor based on an abrupt fiber-taper Michelson interferometer (FTMI) in single-mode fiber fabricated by a fiber-taper machine and electric-arc discharge. The proposed FTMI is applied to measure temperature and refractive index (RI). A high temperature sensitivity of $118.6\mathrm{pm}/°\mathrm{C}$ is obtained in the temperature range of 500°C–800°C. The wavelength variation is only $-0.335\mathrm{nm}$ for the maximum attenuation peak, with the external RI changed from 1.333 to 1.3902, which is desirable for high-temperature sensing to eliminate the cross sensitivity to RI.

© 2013 Optical Society of America

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