A novel detection technique to estimate the amount of chirp in fiber Bragg gratings (FBGs) is proposed. This
method is based on the fact that reflectivity at central wavelength of FBG reflection changes with strain/temperature
gradient (linear chirp) applied to the same. Transfer matrix approach was used to vary different grating parameters
(length, strength and apodization) to optimize variation of reflectivity with linear chirp. Analysis is done for different
sets of 'FBG length-refractive index strength' combinations for which reflectivity vary linearly with linear chirp over a
decent measurement range. This article acts as a guideline to choose appropriate grating parameters in designing sensing
apparatus based on change in reflectivity at central wavelength of FBG reflection.
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