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We have demonstrated an active loop buffer storing an externally generated data packet with a data rate of 18 Gb/s for 200 circulations. Stored data packet lengths ranged from 21.3 ns (384 bits) to 71.1 ns (1,280 bits). The total capacity of the buffer was 1,585 bits. This data rate and stored packet length are the highest reported for externally loaded optical loop buffers.