All-optical signal processing is a key technology in future high-speed optical communication networks. The all-optical logic AND gate is one of the crucial elements for all-optical signal processing. Recently, various approaches have been explored to enable logic AND operation, including use of semiconductor optical amplifiers (SOAs) [1, 2], semiconductor microresonators [3], and periodically poled lithium niobate (PPLN) waveguides [4–8]. These schemes have shown impressive operation performance. However, only single-channel AND output can be obtained. It is well known that PPLN-based all- optical signal processing has several distinct advantages of ultrafast response, no excess noise, and great flexibility owing to various second-order nonlinearities and their cascading. In this Letter, we report a novel dual-channel-output logic AND gate by using cascaded sum- and difference-frequency generation (SFG þ DFG) in a PPLN waveguide. 20 Gbit=s logic AND operation with dual-channel outputs is demonstrated in the experiment.
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Wang EL2007 | 187.34 KB |