A Comparison of Different Sleep Mode Mechanisms for PtP and TDM-PONs

This paper investigates different power-saving mechanisms in ONUs and OLTs for point-to-point (PtP) optical access networks and time-division multiplexed passive optical networks (TDM-PONs). In order to identify appropriate SM mechanisms, we have considered three main factors: (i) frame arrival rates, (ii) frame size as defined by protocols/standards, and (iii) sleep duration (i.e., due to hardware limitations and quality of service (QoS) requirements). We demonstrate through simulations that in order to achieve better power-saving performance while maintaining QoS requirements, fixed cyclic-sleep mode (FSM) is the ideal candidate for all ONUs, whereas dynamic sleep mode (DSM) and dozing mode (DM) can be used for PtP OLTs and PON OLTs, respectively. Simulation results show that the total power consumption per subscriber of PtP and TDM-PON system can be reduced by up to 42% and 50%, respectively.