Exatel Tests Single Carrier 400G With Huawei
WARSAW -- Huawei, a leading global information and communications technology (ICT) solutions provider, and EXATEL, a telecommunications operator in Poland, today jointly declare that they have successfully tested the first 400G WDM (Wavelength Division Multiplexing) system with a single carrier wave on the live network, which is a significant technical breakthrough in the high-speed transmission field.
Currently, the mainstream commercial 40G/100G WDM systems use a single carrier wave. However, on a 400 Gbit/s system, the baud rate doubles, which causes serious distortion of high-speed signals and unstable clocks. To solve these issues, existing 400G systems use multiple aggregated carrier waves, that is, multiple sub-carrier waves are aggregated to form a super channel.
Huawei innovatively adopts the Faster Than Nyquist (FTN) compensation and recovery algorithm, proprietary clock recovery technology, and adaptive soft decision FEC (Adaptive-SDFEC) technology, to address the world-class problems of high-speed signal distortion and unstable clocks. In the test on the existing G.652-based optical network of EXATEL in Warsaw city, Huawei successfully transmits 400 Gbit/s signals over a single carrier wave.
Different from a 400G system with multiple aggregated carrier waves, a 400G WDM system with a single carrier wave requires only one optical transceiver system. Therefore, a 400G system with a single carrier wave features high integration, high availability, and low power consumption. At the same time, because only one carrier wave is used, the management and scheduling are easy. A 400G WDM system with a single carrier wave is a significant direction for the evolution of customers' network.