Abstract
We propose and demonstrate that periodically poled lithium niobate (PPLN) can act as an ultrafast three-input XOR gate for differential phase-shift keying (DPSK) signals based on cascaded sum- and difference-frequency generation. PPLN-based all-optical three-input Boolean XOR operations for return-to-zero DPSK (RZ-DPSK), RZ-DPSK, and non-return-to-zero DPSK signals are all successfully verified in the experiment.
© 2008 Optical Society of America
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