Vanishing the delay of a light pulse induced by propagation in matter

Any transmission line of some extent presents two key steps: propagation in a slow media (respect to the vacuum) with reduction of the signal amplitude and a further propagation in an amplifying media. The aim is to recover the delay induced by propagation in matter. Our idea is to combine, in a proof of principle experiment, the delay induced in a slow light propagation with a subsequent “superluminal” propagation in an amplifying medium. In addiction we show that this possibility can be optically controlled