10-mode PM-QPSK Transmission over 2320 km Enabled by Optimized Mode Permutation Strategies

For the first time, we demonstrate a 15-Gbaud PM-QPSK 10-mode transmission, extending the record reach by 1000 km, to 2320 km now. We develop the rules for identifying superior mode-permutation strategies (MPSs) among a huge number of MPSs. 24 MPSs are verified in experiments to greatly mitigate the differential mode delay and mode-dependent loss.