ONU power saving modes in next generation optical access networks: progress, efficiency and challenges

Abstract

Abstract:The optical network unit (ONU), installed at a customer's premises, accounts for about 60% of power in current fiber-to-the-home (FTTH) networks. We propose a power consumption model for the ONU and evaluate the ONU power consumption in various next generation optical access (NGOA) architectures. Further, we study the impact of the power savings of the ONU in various low power modes such as power shedding, doze and sleep.

Novel DBA algorithm for energy efficiency in TWDM-PONs

“…We assumed a maximum ONU load of 100 Mbps, downstream and upstream line rate of 10 Gbps and 2.5 Gbps, maximum OLT to ONU distance of 20 km, maximum cycle time of 2 ms, ONU buffer of 1 MB, T as 0.1s, TT of ONUs as 1 ms, ONU power as 80% of the total (OLT+ONU) power, power in sleep mode as 15% of the active ONU power, and guard time between adjacent ONU slots as 1 µs. We generated traffic as in 2 . The up-and downstream normalized load is considered to vary symmetrically.…”

Flexible TDMA/WDMA passive optical network: Energy efficient next-generation optical access solution

“…For optical access networks, the bulk of the energy is consumed at the ONUs, necessitating research initiatives as in [30], [31]. At the same time, saving energy at the OLT is a key requirement for network operators as it directly influences their operational…”

Pipelined architecture of dynamic bandwidth allocation for energy efficiency in XG-PON

“…To save energy of XG-PONs, an ONU with a sleep mode was proposed in [3]. The sleep mode means that an idle ONU sleeps until the ONU receives sufficient amount of packets.…”

“…The sleep mode means that an idle ONU sleeps until the ONU receives sufficient amount of packets. Also, a DBA algorithm was introduced that exploits the sleep mode in [3]. However, the power consumption of an OLT was not considered in [3].…”

“…Also, a DBA algorithm was introduced that exploits the sleep mode in [3]. However, the power consumption of an OLT was not considered in [3]. When the number of ONUs is large, the operation speed of an OLT must be high to complete the DBA operation within an FD.…”