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All-optical flexible 20-Gb/s logic AND gate based on cascaded sum-and difference-frequency generation in a periodically poled lithium niobate waveguide is proposed and experimentally demonstrated. The theoretical analyses further indicate that 40-, 80-, and 160-Gb/s ultrahigh-speed logic AND operations can potentially be performed. Moreover, it is expected that the AND output can be tuned in a wide wavelength range (67 nm) with slight fluctuation of the Q-factor and extinction ratio. Indexdoi:10.1109/lpt.2007.913227 fatcat:2lyadmntfncqvc75itrfsrcxgu