Temperature-insensitive curvature sensor based on anti-resonant reflection guidance and Mach-Zehnder interferometer hybrid mechanism

Abstract

A temperature-insensitive optical fiber curvature sensor based on hollow-core fiber is proposed. The hybrid guidance mechanism is a combination of anti-resonant reflecting guidance and the Mach-Zehnder interferometer. The curvature can be detected through the wavelength interval between the two kinds of lossy dips resulting from the two above-mentioned guidance mechanisms. The curvature sensitivity is -0.54 nm/m-1 and -2.02 nm/m-1 in the curvature range of [0 m-1, 7.04 m-1] and [7.04 m-1, 11.87 m-1], respectively. And the temperature cross-sensitivity of the sensor is only 5.54 pm C-1, which makes the device attractive for potential applications in curvature measurements.