Switching from normal to anomalous dispersion in photonic crystal with Raman gain defect. 
Propagation of a light through a one-dimensional photonic crystal containing a defect layer doped with a Raman gain medium is discussed.  We demonstrate all-optically controlled switching from normal to anomalous dispersion in such a structure.  A group delay for the transmitted probe (Raman) pulse is investigated.  We show that the group velocity of a Raman pulse can be tuned from subluminal to superluminal by varying the intensity of the pump field.