Long-Haul >100-Tb/s Transmission Over >1000 km With High-Symbol-Rate Triple-Band WDM Signals

Extending the optical wavelength division multiplexing (WMD) bandwidth is a promising approach to push the envelope of single-mode fiber (SMF) capacity for optical transmission systems. In addition to increasing the system capacity, we should meet the demand for high-capacity long-haul optical transmission while accommodating next-generation high-speed client signals such as 800 Gb, 1.6 Tb Ethernet, and more. High-symbol-rate technologies with high-order quadrature amplitude modulation (QAM) based on digital coherent technologies can increase the capacity per WDM channel while maintaining the transmission distance. This paper demonstrates >100-Tb/s SMF inline-amplified transmission with 122-channel 144-GBaud PDM-PCS-16/64QAM signals in 18.3-THz triple-band WDM using the S, C, and extended L bands. A low-water-peak fiber, compliant with ITU-T G.652.D, was applied to the transmission line with hybrid backward distributed Raman and rare-earth-doped optical fiber amplifiers. This configuration enabled sufficient Raman on-off gain to compensate for excess power degradation in the S band due to stimulated Raman scattering among the wavebands. In this experiment, we obtained transmission results for a net bitrate of 132.3 Tb/s over 320 km (4×80 km) with an average WDM channel rate of 1.084 Tb/s/λ, 121.7 Tb/s over 720 km (9×80 km) with 997.8 Gb/s/λ, and 110.7 Tb/s over 1040 km (13×80 km) with 907.6 Gb/s/λ. These results demonstrate that multiband transmission with high-symbol-rate WDM channels is suitable to achieve >100-Tb/s SMF capacity with long-haul transmission of >1000 km while achieving high-speed WDM channels.