Capacity-approaching transmission over 6375 km at spectral efficiency of 8.3 bit/s/Hz. - Shaoliang Zhang; Fatih Yaman; Yue-Kai Huang; John D. Downie; Ding Zou; William A. Wood; Aramais R. Zakharian; Rostislav Khrapko; Snigdharaj K. Mishra; Vladimir Nazarov; Jason E. Hurley; Ivan B. Djordjevic; et al. (OFC, 2016)