FIFO-free 4-core dual-polarization optical hybrid using a single dielectric metasurface

Spatially scalable metasurface-based optical hybrid for dual-polarization (DP) multi-core coherent receiver is proposed and experimentally demonstrated. Simultaneous homodyne detection and demodulation of DP-64QAM signals from a 4-core fiber are achieved with an error vector magnitude of 2.3% for all spatial/polarization channels at 1550 nm.