Transmission and Reception of 17×480 Gbit/s PDM-16QAM with Tx/Rx I/Q Imbalance Compensation and Simplified MLSE for Metro-Regional 400G Optical Communications

We experimentally demonstrate a single-carrier 400G Metro/regional communications based on 60-GBaud PDM-16QAM over 430-km SMF-28. Joint GPD and GSOP and 4×4 MIMO LMS equalizer are adopted to compensate Rx/Tx I/Q imbalance, and simplified MLSE with 99.61% computational complexity reduction is employed to mitigate channel bandwidth constraint.