Phase dispersion characterization of fibre gratings

A high wavelength resolution set-up based on an interferometric technique has been used to provide accurate phase dispersion and time delay measurements of fibre photorefractive gratings. Standard and highly chirped gratings has been characterized and the results used to develop a chirped fibre filter which can be used for dispersion-compensation in long fibre telecommunications links, thus greatly enhancing the capacity of the existing fibre base.