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The slow light effects of an amplitude modulated Gaussian (AMG) pulse in acesium atomic vapor are presented. In a single-$\Lambda$ typeelectromagnetically induced transparency (EIT) medium, more severe distortionis observed for an AMG pulse than a Gaussian one. Using Fourier spectrumanalysis, we find that the distortion, as well as the loss, is dominantlycaused by linear absorption than dispersion. Accordingly, a compensation methodis proposed to reshape the slow light pulse based on the transmission spectrum.In addition, we find a novel way to obtain simultaneous slow and fast light.

Slow light of an amplitude modulated Gaussian pulse in electromagnetically induced transparency medium