SD FEC is an advanced error correction technology for optical transport field. Huawei said the use of Optical Digital Signal Processing (oDSP) modules, essentially a 400G technology breakthrough, achieves lower-penalty WDM transmission with lower power consumption per bit. Specifically, the second generation SD FEC system empowers a transmission distance of 4000 km, which is 1000 km longer compared to the first generation SD FEC system, resulting in a 30% higher transmission performance.
Huawei noted that it has built more than 90 commercial 100G networks for operators worldwide.
KPN first deployed Huawei’s optical transport platform in its European network in 2008.
http://www.huawei.com/en/about-huawei/newsroom/press-release/hw-266812-kpn.htm