Experimental evaluation of an energy efficient TDMA PON

This paper presents the experimental evaluation of an energy-efficient TDMA PON utilizing cyclic sleep technique. In particular, two methods for deciding when to trigger ONU sleep mode are evaluated: downstream (DS)-based triggering and Cooperative triggering. In the former method, the decision whether the ONU is switched to sleep is taken based on the DS traffic only. In the latter one, the decision is taken by considering both DS and upstream (US) traffic. The performance is assessed with constant sleep time as well as variable sleep time for different DS/US traffic ratios. Experimental results show that both triggering methods achieve significant energy savings. The Cooperative saves slightly less energy than the DS-based while providing better network performance, in terms of frame loss rate and frame delay, for both DS and US traffic.