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Tilted fiber Bragg grating (TFBG) sensors have been employed in fiber-optic refractive index sensors and biosensors, thanks to their inherent sensitivity. However, low-cost coarse-sampling spectrometers are not able to discriminate TFBG cladding modes, which are used for refractive index sensing. In this work, we demonstrate that it is possible to detect small refractive index variations by analyzing...
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