Abstract
We report a fiber-optic strain sensor that can simultaneously achieve high resolution and large dynamic range. The sensor is a fiber-optic Fabry–Perot cavity formed by cascaded high-reflection chirped fiber Bragg gratings with opposite chirp directions. The reflection spectrum of the sensor features a series of narrow spectral notches with unequal spacings. The sensor is demodulated by the wavelength scanning of a distributed feedback laser diode through the current-injection modulation. The narrow spectral notch leads to high measurement resolution; while the unambiguous identification of the spectral notches through their unique spectral spacings results in large measurement range without the need for fringe counting. We have demonstrated a linear axial strain response of the sensor with strain resolution of $0.033~\mu \varepsilon $ over a range of $1000~\mu \varepsilon $ .
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