Characterization of fiber Bragg grating based on grating profile and apodization for sensor applications

In this paper, characterization of the fiber Bragg grating (FBG) based on grating profile and apodization type has done. The FBG parameters considered here are grating length, grating profile and apodization type. The characteristics of FBG include reflectivity, full width at half maximum (FWHM) and side lobe power. The FBGs having high reflectivity, low FWHM and side lobe power are required for the sensing applications. A GratingMOD simulation tool based on a coupled mode theory and a transfer matrix method is used for the characterization of FBG. The effect of FBG parameters, grating length, grating profile and apodization on the characteristics of FBG is studied. The FBG parameters, grating length, grating profile and apodization type are optimized for the sensing applications. The FBG having grating length, 5 mm, sinusoidal profile and apodization type is optimized.