Mitigation of Inter-Subcarrier Linear Crosstalk with Groupwise Fixed FDE assisted MIMO

We experimentally demonstrated inter-subcarrier linear crosstalk mitigation of five-subcarrier 10-GBaud RRC-PM-16QAM using Groupwise fixed FDE assisted MIMO. The proposed method enabled 6.3% tighter subcarrier spacing over 120 km SSMF, compared to conventional 2x2 MIMO.