“…Januario et al present in [11] a 10×400 Gb/s (DP-16QAM 32 GBd) dual-carrier unrepeatered transmission over 350 km and 370 km of large effective area and LL-SMF fibers with and without DBP algorithm, respectively, and with SC-LDPC. The same group demonstrate in [12] a 16×400 Gb/s (DP-16QAM 66 GBd) unrepeatered transmission over 400 km of ultra-low loss and large effective area fibers using SC-LDPC, while in [13] a 24×400 Gb/s (DP-16QAM 64/66 GBd) unrepeatered transmission over 443.1 km of ultra-low loss and large effective area and LL-SMF fibers employing DBP and SC-LDPC is presented. Although several signal processing and coding techniques for unrepeatered transmission have been individually proposed, to the best of our knowledge, an unifying analysis of nonlinearity compensation, transceiver impairments mitigation and coding schemes, and their potential rate gains and complexity analysis, has not been presented.…”