An offline PLI-RWA and delay analysis for cost and latency reduction in optical WDM networks

In this paper, we formulate a framework that solves the offline physical layer impairment-routing and wavelength assignment (PLI-RWA) issue in translucent networks. The novelty of the work lies in (1) applying the innovative PLI-signal quality and delay aware RWA (PLI-SQDARWA) algorithm, and (2) a delay analysis proposal that justifies the concept of latency awareness in translucent networks. The results show that PLI-SQDARWA outperforms its counterpart, COR2P (Cross-Optimization for RWA and Regenerator Placement) in terms of both, connection blocking and number of network components. Further, performance comparison result of the network equipped with our previously proposed novel hybrid translucent node and existing node architectures shows that for any network configuration, there exists a trade-off between delay incurred for obtaining and maintaining the desired quality of transmission (QoT). In addition, for network equipped with the novel hybrid translucent node, optimum delay value for obtaining the desired QoT is found to be lower compared to when the network is equipped with node architectures existing in literature.