We demonstrate integrated optical neural network processor with excellent error tolerance using multiport directional couplers. Thanks to the robust multi-plane light-conversion mechanism, high data-classifying accuracy over 95% is confirmed, insensitive to the exact coupling ratio.

Spatially scalable surface-incidence dual-polarization (DP) coherent receiver with a dielectric metasurface and photodetector array is proposed. The designed metasurface is fabricated on a silicon-on-quartz chip to demonstrate ideal wave-mixing functionalities required for DP coherent detection.

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