Abstract

We report on a fiber-integrated refractive index sensor based on a Fabry–Perot micro-resonator fabricated using simple diamond blade dicing of a single-mode step-index fiber. The performance of the device has been tested for the refractive index measurements of sucrose solutions as well as in air. The device shows a sensitivity of 1160 nm/RIU (refractive index unit) at a wavelength of 1.55 μm and a temperature cross-sensitivity of less than ${10}^{-7}\mathrm{RIU}/°\mathrm{C}$. Based on evaluation of the broadband reflection spectra, refractive index steps of ${10}^{-5}$ of the solutions were accurately measured. The conducted coating of the resonator sidewalls with layers of a high-index material with real-time reflection spectrum monitoring could help to significantly improve the sensor performance.

© 2017 Optical Society of America

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