Group velocity control in Dy 3+ -doped fiber Bragg grating

In this paper, we propose to use a pump to decrease or increase the group velocity of a probing pulse in fiber Bragg gratings (FBG) with different grating parameters written into an Dy3+ doped optical fiber based on the facts of the observations that pump-induced changes on the refractive index and dispersion associated with the 6H15/2–6F11/2 transition in Dy3+ doped optical fiber. We discuss the effects of pump power, fiber grating length and doping concentration on the group velocity control.