Achievable rates with implementation limitations for G.fast-based hybrid copper/fiber networks

Hybrid copper/fiber networks bridge the gap between the fiber link and the customer by using copper wires over the last meters. This solution combines energy efficiency and low cost of the copper access network with high data rates of a fiber connection. However, the fiber to the distribution point (FTTdp) network must prove its ability to convey data at fiber speed over copper wire bundles under the spectral constraints of the copper access network. This work investigates achievable data rates of the FTTdp network. It provides an analysis of the sources of performance loss in a system implementation due to complexity limitations. Methods to improve achievable rates are shown, that are based on incorporating the limitations in the optimization process. Achievable data rates are analyzed in terms of rate vs. reach curves, based on a statistical channel model and the ITU standard G.fast. The results indicate that optimized linear methods perform well on shorter lines, while nonlinear methods have advantages for long lines.