Third-order dispersion in linearly chirped Bragg gratings and its compensation

When fiber optic's quadratic dispersion is compensated, the cubic dispersio n determines the transmission quality in an optical link. Although the thir d-order dispersion coefficient is small in standard fiber optics at the thi rd window, it is not in the linearly chirped grating used to the second-ord er dispersion equalization. The influence of the grating parameters on its third-order dispersion value is systematically studied and an efficient and low-cost device is proposed that is numerically proven to cancel the globa l third-order dispersion that arise from the optical link.