Abstract
A new approach utilizing effects of dispersion in the high-order-mode fibers (HOMFs) to effectively discriminate changes in environmental temperature and axial strain is proposed and experimentally demonstrated. Experimental characterization of a HOMF-based fiber modal interferometer with a sandwich fiber structure exhibits excellent agreements with numerical simulation results. A Fourier transform method of interferometry in the spatial frequency domain is adopted to distinguish mode coupling between different core-guided modes. Distinct phase sensitivities of multiple dispersion peaks are extracted by employing a novel phase demodulation scheme to realize dual-parameter sensing.
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Xu, Y., Lu, P., Song, J. et al. Dispersion effects of high-order-mode fiber on temperature and axial strain discrimination. Photonic Sens 5, 224–234 (2015). https://doi.org/10.1007/s13320-015-0249-9
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DOI: https://doi.org/10.1007/s13320-015-0249-9