3500-km mode-multiplexed transmission through a three-mode graded-index few-mode fiber link

We transmit 33 WDM channels over 3500-km three-mode fiber at record post-FEC spectral-efficiency-distance product of 31500 bit/s/Hz · km. This was facilitated by building a DGD compensated fiber span with low MDL and coherent 6×6 MIMO processing. Refereed/Peer-reviewed