Energy Efficient Performance Evaluation of XG-PON for Sustainable Green Communication Infrastructure

The era of industrialization and advanced of information and communication technology (ICT) leading to an increasing global power consumption, arising the concern of carbon dioxide (CO2) emission, global warming as well as higher total capital expenditure (CAPEX). Partially, these are contributed from the Optical Network Unit (ONU) in the access network which consumes 60% of total power such as in the 10-Gigabit Passive Optical Network (XG-PON). In order to save power, one of the promising solution is to put the ONU into the sleep mode when there are no traffic either in upstream (US) or downstream (DS) direction. In this paper, we present an energy efficient XG-PON employing the watchful sleep mode, having the features of simple configurations and less signaling between ONU power levels. We also combine this sleep mode with the available Immediate Allocation Colorless Grant (IACG) Dynamic Bandwidth Allocation (DBA) scheme to investigate the increasing power saving while utilizing the bandwidth resources efficiently.