2100-km Mode-Multiplexed Transmission through a Three Mode Graded-Index Few-Mode Fiber

We transmit 33 WDM channels over 2100 km of three-mode fiber at record post-FEC spectral efficiency-distance product of 18920 bit/s/Hz km. This was facilitated by building a DGD compensated fiber span with low MDL and coherent 6 x 6 MIMO processing.