Unrepeatered WDM Transmission of Single-Carrier 400G (66-GBd PDM-16QAM) over 403 km

Experimental Comparison of Probabilistic Shaping Methods for Unrepeated Fiber Transmission

“…For unrepeated optical transmission systems, no in-line active elements are required, which means that they provide a cost-efficient solution for short links and are thus crucial for the Internet connectivity of isolated communities and island-to-island or island-to-continent connections [25], [26]. As a result of the growing capacity demands, increasing the throughput for such systems is of a high relevance.…”

Advanced Digital Signal Processing and Variable-Rate Coding for Unrepeatered Optical Transmission

“…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.…”

All-Optical Nonlinear Pre-Compensation of Long-Reach Unrepeatered Systems

“…2. Record transmission performance has been recently reported with such systems [3], [14], [15] . It is composed of 100 km of large effective area fiber (Vascade EX2000), followed by 250 km of low-loss single mode fiber (LL-SMF).…”