Abstract

Simultaneous measurements of refractive index (RI) and temperature are proposed and experimentally demonstrated by using a tapered bend-resistant fiber interferometer. Different phase shifts of an inner and outer cladding mode of the fiber interferometer are measured to determine the temperature compensated RI of a glycerol solution. The temperature coefficients of the inner and outer cladding modes are $-0.0253\mathrm{rad}/°\mathrm{C}$ and $-0.0523\mathrm{rad}/°\mathrm{C}$, and the RI coefficients are $4.0403\mathrm{rad}/\mathrm{R}\mathrm{I}\mathrm{U}$ and $44.823\mathrm{rad}/\mathrm{RIU}$, respectively. The minimum errors of temperature and RI are 0.6°C and 0.001 RIU, respectively.

© 2012 Optical Society of America

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