Single-Wavelength 512-Gb/s SSBI-Free Linear Phase-Diverse Direct Detection with Carrier Phase Switching

We propose SSBI-free phase-diverse direct detection receiver using three carrier phase-switching branches. We experimentally demonstrate single-wavelength 512-Gb/s PS-144-QAM over 80-km SSMF with only linear DSP and 1-dB CSPR for 400G data-center interconnect interface and beyond.