26 October 2007 Interrogation of a long-period-grating-based fiber sensor based on linear Gaussian function curve fitting
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Proceedings Volume 6796, Photonics North 2007; 679622 (2007) https://doi.org/10.1117/12.779077
Event: Photonics North 2007, 2007, Ottawa, Canada
Abstract
An intensity interrogation system for a long-period-grating (LPG) -based fiber sensor using a linear combination of two Gaussian functions as the curve fitting function is proposed and demonstrated. The selected resonant dip of the LPG transmission spectrum can be reconstructed with the curve fitting function based on the measured intensities at different wavelengths. Thus, the center wavelength and the minimum transmission value of the resonant dip can be interrogated simultaneously. The center wavelength is obtained by calculating the first-order derivative of the fitting function, which is 1562.74 nm compared to 1562.3 nm directly measured using an optical spectrum analyzer (OSA). The minimum transmission value is obtained directly from the fitting curve, which is -35.6 dBm is compared to -34.2 dBm directly measured from an OSA. An arrayed waveguide grating (AWG) is supposed to be adopted for the intensity measurement. However, the experiment is carried out using a tunable optical filter to approve the concept due to the unavailability of a suitable AWG at the time of experiment.
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Honglei Guo, Gaozhi Xiao, Jianping Yao, "Interrogation of a long-period-grating-based fiber sensor based on linear Gaussian function curve fitting", Proc. SPIE 6796, Photonics North 2007, 679622 (26 October 2007); doi: 10.1117/12.779077; https://doi.org/10.1117/12.779077
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