Real-time Unrepeatered Extended C-Band Transmission of 16-Tb/s over 420-km (73.2-dB) and 24-Tb/s over 390-km (67.7-dB) with Field-deployed Submarine Cable

Real-time 80×200-Gb/s polarization-multiplexed quadrature-phase-shift keying (PM-QPSK) and 60×400-Gb/s polarization-multiplexed 16-quadrature amplitude modulation (PM-16QAM) DWDM signals are respectively transmitted over 420-km (73.2-dB span loss) and 390-km (67.7-dB span loss). The results exhibit respectively a new span loss record, and a largest span loss and capacity product record in real-time DWDM unrepeatered transmission systems.