Adaptive traffic-aware and energy-efficient ONU sleep mechanism for sustainable passive optical networks

Abstract

Abstract For delivering the symmetrical upstream and downstream speeds over the existing fiber, 10 Gigabit symmetrical PON (XGS-PON) is a promising solution. In this paper, a traffic-aware energy-efficient XGS-PON system employing adaptive ONU operating states is proposed and analyzed. The system operates at 10 Gbps in the downstream and apply traffic aware scheme to decrease the utility of the ONU during less traffic conditions. The baseline downstream link is designed to operate at a data rate of 10 Gbps, which is further varied as per the different traffic conditions to be analyzed. The system is investigated for the different network utilization, such as 100 %, 75 %, 50 %, 25 %, and 10 %, along with the complete sleep mode of ONU, where it is almost inactive. The performance of the proposed system architecture is evaluated in terms of BER, Q factor, received optical power, and ONU power consumption. The simulated results indicate that the system is providing acceptable BER and Q factor under full load conditions. Furthermore, this traffic-aware architecture attains ONU energy savings of 75 % under 10 % traffic conditions. The obtained results validate that the proposed system decreases the energy consumption at ONU under low traffic conditions while simultaneously maintaining reliable communication.