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We demonstrate a regenerative variable optical buffer suitable for both non-return-to-zero and return-to-zero intensity-modulated packets. The buffer is based on a re-circulating fiber loop that exploits a regenerative amplification stage based on cross-gain-compression in a semiconductor optical amplifier. This buffer does not suffer from any transient effect at the packets' edges, and due to its working principle, can be used for packets of different length. We report experimental resultsdoi:10.1109/jlt.2012.2189868 fatcat:yhhq55bconcwtjb4ecn7lbaxse