1700 km transmission at 40 Gbit/s with 100 km amplifier spacing enabled by higher-order-mode dispersion compensation

Transmission at 40 Gbit/s over 1700 km of non-zero dispersion fibre with 100 km amplifier spacing is reported for the first time. The demonstration is enabled by an all-fibre higher-order-mode dispersion-compensating module (HOM-DCM) and distributed Raman amplification.