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We investigate dispersion and absorption properties of a weak probe field ina four level atomic system through interacting dark resonances. We show thattwo narrow peaks appears in the optical spectra due to the presence ofinteracting dark resonances. This two narrow peaks leads to the superluminallight propagation with strong absorption. However, if a weak incoherent pumpfield is exerted to the probe transition, then the peaks structures can bechanged such that two absorption peaks transformed to two gain deeps. We Showthat both subluminal and superluminal light propagation occur in this system,where controlled by the incoherent pumping strength.

Group velocity control in a four level system through interacting dark resonances