A digital coherent super-receiver enables the reception and demodulation of a 7×10GBd DP-64QAM Nyquist spaced super-channel. Multi-channel DBP provides a 100% improvement in reach from 640km to 1280km of SSMF, with an ISD of 9.15b/s/Hz.
Maher, R., Lavery, D., Millar, D., Alvarado, A., Parsons, K., Killey, R., & Bayvel, P. (2015). Reach enhancement of 100% for a DP-64QAM super-channel using MC-DBP. In Conference on Optical Fiber Communication, Technical Digest Series (Vol. 2015-June). Institute of Electrical and Electronics Engineers Inc. https://doi.org/10.1364/ofc.2015.th4d.5