Extending Phase Noise Tolerance in UDWDM Access Networks

Geometrically shaped constellations, designed for improved AWGN channel performance, are combined with enhanced symbol decision metrics for low symbol rate/high linewidth applications, e.g., ultra-dense wavelength division multiplexed passive optical networks (UDWDM-PON). The improved metric enables 32-ary constellation transmission with robustness to AWGN and phase noise.