Abstract

A low-temperature crosstalk and surrounding refractive index insensitive vector bending sensor based on resonance coupling is proposed and experimentally demonstrated. The sensor is constructed by directly sandwich-splicing a segment of single eccentric hole-assisted dual-core fiber between two single-mode fibers. The transmission characteristics of the sensor are theoretically analyzed by combining coupled-mode theory and full-vector finite-element method. The bending responses of the sensor are experimentally measured in the curvature range of $0–3.6651{\mathrm{m}}^{-1}$. The bending sensitivities are $-15.95\mathrm{nm}/{\mathrm{m}}^{-1}$ and $14.87\mathrm{nm}/{\mathrm{m}}^{-1}$ at 0° and 180° bending orientation, respectively, which are higher than that of most long-period fiber-grating-based and interferometer-based vector bending sensors. Moreover, the temperature and surrounding refractive index responses of the sensor are investigated. The measured results show that the proposed sensor has a low temperature sensitivity of 21.7 pm/°C in the range of 15°C–55°C and is insensitive to the surrounding refractive index in the range of 1.335–1.425, which reduces the cross-sensitivity from temperature and surrounding refractive index.

© 2019 Optical Society of America

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