Survivability analysis of wireless bypass-based protection for Passive Optical Network

Network survivability is becoming a key issue in Passive Optical Networks (PONs). In conventional PONs, optical protection is applied to improve the network survivability. However, optical protection may be considered cost-prohibitive for cost-sensitive access networks. In this paper, by establishing wireless links among ONUs, we propose a novel wireless bypass-based protection method which has two schemes: intra-domain wireless bypass and inter-domain wireless bypass. We then present the survivability model of wireless bypass-based protection, and evaluate the survivability model by means of probabilistic analysis, taking both optical and wireless segments into account simultaneously. We also compared the survivability with full optical protection, and our results highlight that the bypass-based protection method perform an improvement in survivability. In addition, we quantitatively analyze the impact of probability of fiber link failure, wireless bypass links and wireless bypass distance on the network survivability.