Novel Mirror-flipped Mode Permutation Technique for Long-haul Mode-division Multiplexing Transmissions

We propose a mirror-flipped mode permutation scheme based on newly developed differential-mode-delay-symmetric fibers, which further suppresses modal-dispersion impact by 30% and mitigates mode-dependent-loss impact with 3.8-dB Q-factor improvement compared with the traditional permutation method in 1028-km 6-mode transmission. © 2022