Performance optimization of chirped fiber Bragg gratings by asymmetrical apodization

Using the transfer matrix method for analyzing the chirped fiber Bragg gratings reflective spectrum and group delay ripple. Compared the difference in reflective spectrum and group delay ripple(GDR) among unapodized chirped fiber Bragg gratings, symmetrical apodized chirped fiber Bragg gratings and asymmetrical apodized chirped fiber Bragg gratings. The grating is divided into three segments, we focus on how to select an optimal parameters ‘a’ in Gaussian profile of each segment by comparing the change of full width half maximum(FWHM) and the change of mean group delay ripple between unapodized chirped fiber Bragg gratings and partly-apodized chirped fiber Bragg gratings.