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An ultra-compact multimode interference (MMI) coupler with a length ~10 ??m for dense photonic integration is designed by parallel particle swarm optimization (PSO) with parallel finite-difference time-domain (FDTD). The MMI coupler uses a strongly-guiding deep-etched InP platform and the modal analysis of this strongly-guiding deep-etched InP waveguide gives the cross section of the single-mode nanophotonic...
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