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Experiments have demonstrated the possibility of optically changing the group velocity of an optical pulse as it travels through a material. These experiments have shown that it is possible to slow the speed of light up to nearly stopping it and also faster-than-light propagation of the pulse envelope (although not its information) has been demonstrated . The possibility of slowing or advancing light in optical fibers is very interesting since it can be potentially used for the development of fast-access memories and optically-controlled delay lines which would be compatible with fiber-optic communication systems.