Bayesian-optimized all-optical logic gates based on optical pumping in quantum-dot semiconductor optical amplifiers.

The demand for ultrafast, low-cost optical processing exposes limitations in current all-optical Boolean logic gates, including carrier dynamics and manual tuning. We numerically investigate all-optical XOR, AND, NOT, NOR, NAND, and XNOR gates using an optically pumped quantum-dot semiconductor optical amplifier in a Mach-Zehnder interferometer (OP-QD-SOA-MZI). Replacing electrical pumping mitigates pattern dependence and improves logic-level separability at 250 Gb s-1. Bayesian optimization (BO) replaces exhaustive parameter sweeps. OP yields higher quality factors than electrical pumping. BO-optimized OP-QD-SOA-MZI achieves correct gate operation at 250 Gb s-1, providing an efficient, high-quality design route for multi-parameter optical logic.