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In this paper, we present the first wavelength-preserving, tunable all-optical delay lines surpassing the microsecond range. Experimental demonstrations with 10-Gb/s data streams, tunable over 1.83 ??s, as well as 40-Gb/s data tunable over 1.56 ??s, characterized by a record delay-bandwidth product of 78 000, are presented and analyzed in detail.