On‐chip dual‐mode all‐optical multifunctional logic unit based on multimode FWMs

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An on‐chip dual‐mode all‐optical multifunctional logic operation unit including four AND and two OR logic gates is proposed and experimentally demonstrated. It is realized using multiple intra‐mode four‐wave mixing (FWM) processes in a multimode silicon waveguide for 2 × 10 Gbit/s non‐return‐to‐zero on–off‐keying (NRZ‐OOK) mode‐division multiplexing signals. The AND logic operation is realized via the non‐degenerate FWM processes, and the OR logic operation is realized by overlapping the two degenerate FWM idlers in frequency domain via appropriately selecting the dual‐mode pump wavelength. The two OR and four AND logic sequences are verified with NRZ‐OOK sequences for both TE 0 and TE 1 modes.