A high-sensitive fiber curvature sensor using twin core fiber-based filter |
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Authors: | G L Yin S Q Lou W L Lu X Wang |
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Institution: | 1. School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing, 100044, China
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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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