In this paper a new technique is presented for improving the pulse-delay performance of a stimulated Brillouin scattering(SBS) based multi-line delay structure by using fiber Bragg gratings(FBGs).Two FBGs and a 15 km-long standard single-mode fiber(SSMF) are used in the structure.We designed the Bragg wavelength and dispersion of the FBGs so that the probe could be amplified by the pump through SBS for several times in the same fiber.The effect of two-line delay structure was achieved.In additio...