Quantitative analysis of optical network unit sleep technique with maintained latency for asymmetric usage by residential users

This study provides an insight into the effectiveness of an optical network unit (ONU) sleep technique, where a subcomponent of the ONU is powered down during the absence of input traffic. The approach contributes to the realisation of advanced power efficiency over a wide range of input throughputs in situations where downstream traffic exceeds upstream traffic in recent residential networks. A numerical simulation showed that power-saving effectiveness could be achieved for an Mbit/s downstream throughput without latency implications in the Tx sleep mode.