Abstract
A high-sensitive fiber curvature sensor is proposed and experimentally demonstrated in a large measurement range by using a twin core fiber (TCF)-based filter as sensor head. Applying the coupled-mode theory and equivalent refractive index model, we theoretically anticipate the “blue shift” of the transmission dips of the TCF-based filter when sensor head is bent. Experimentally, we fabricate an 86.9 mm TCF-based filter with a free spectral range of 49 nm and characterize its curvature performance by measuring the wavelength shift. A nonlinear “blue shift” of the wavelength is observed when we increase the curvature. The relationship between wavelength shift and curvature is a second-order polynomial function. In the range from 0 to 9.30 m−1, the maximum sensitivity is up to −14.7 nm/m−1. The measurement range can be further increased by selecting a shorter TCF.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China under Grant Nos. 61177082 and 61205074, the Natural Science Foundation of Beijing under Grant No. 4122063.
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Yin, G.L., Lou, S.Q., Lu, W.L. et al. A high-sensitive fiber curvature sensor using twin core fiber-based filter. Appl. Phys. B 115, 99–104 (2014). https://doi.org/10.1007/s00340-013-5578-z
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DOI: https://doi.org/10.1007/s00340-013-5578-z