Optimization of fiber Bragg grating length for maximum reflectivity

This paper presents the optimization of length of an optical fiber grating for maximum reflectivity and minimum side lobe strength. The performance of fiber Bragg grating mainly depends on grating length and change in refractive index. Change in refractive index plays a crucial role in side lobe strength; it increases with increase in change in refractive index. It is mainly due to abrupt change in refractive index at the two edges of the grating. The wavelength chosen for analysis is from the third window to minimize the attenuation. The reflection spectra with different lengths and change in refractive index were analyzed. The simulations are based on solving coupled mode equations by transfer matrix method and the optimized parameters are obtained.