Abstract

In this paper, we present a simple, compact, and highly sensitive optical fiber curvature sensor. It consists of dual no-core fibers for coupling energy from the lead-in single-mode fiber (SMF), and recoupling the energy into the lead-out SMF. The sensing section is constituted by multicladding fiber with a length of 5 cm. In the experiment, the spectrum shows a blueshift, and the energy corresponding to the resonant wavelength shows a cosine series with a bending of the sensing segment. The curvature sensitivity around the wavelength of 1550 nm shows $-39.02\mathrm{nm}/{\mathrm{m}}^{-1}$ within the curvature range from 0.3 to $2.14{\mathrm{m}}^{-1}$. The temperature sensitivity is $78.2\mathrm{pm}/°\mathrm{C}$ in the temperature range of 10°C–60°C. It implies the possibility of temperature measurement.

© 2014 Optical Society of America

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