A Novel Signal and Delay Aware, Zero Blocking PLI-RWA and Translucent Node Architecture for Optical WDM Networks

Abstract

Abstract-In this paper, we formulate a framework that solves the offline physical layer impairment-routing and wavelength assignment (PLI-RWA) issue in translucent wavelength division multiplexed (WDM) optical networks. The novelty of work lies in (1) introducing an innovative PLI-signal quality and delay aware RWA (PLI-SQDARWA) algorithm that (a) considers both, signal quality and end-to-end delay for candidate route computation and (b) minimizes the total required network components (i.e. regenerators and wavelength converters), and (2) proposal of a delay analysis in order to justify the concept of latency awareness in translucent WDM networks.We show that for all traffic load values, PLI-SQDARWA outperforms its counterpart, COR2P (Cross-Optimization for RWA and RP) in terms of 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.Index Terms-Translucent WDM network, signal quality and delay aware routing, regenerator and wavelength converter placement, PLI-RWA.

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

“…Also, for WC, since no optical-electrical-optical (OEO) conversions are required, the processing delay is assumed to be zero whereas, regeneration, which necessitates OEO conversion, is considered to incur a fixed amount of processing delay [4]. The other simulation parameters are adopted from our previous studies [1][2][3][4].…”

“…• First, we apply the innovative PLI-signal quality and delay aware RWA (PLI-SQDARWA) algorithm [1] that considers both, signal quality and end-to-end delay in order to evaluate a candidate route. Hence, apart from only minimizing the overall network cost, PLI-SQDARWA also aims to minimize the overall network latency.…”

A Survey on Next-Generation Mixed Line Rate (MLR) and Energy-Driven Wavelength-Division Multiplexed (WDM) Optical Networks

“…In order to obtain a computationally tractable solution, RWA problem is often solved sequentially as separate R and WA problems. Researchers have also tried to solve RWA problem jointly [25].…”

“…The authors in [25] extended the work presented in [38] by (1) introducing the PLI-signal quality and delayaware RWA (PLI-SQDARWA) algorithm that (a) considers both signal quality and end-to-end delay for candidate route computation and (b) minimizes the total required network components, and (2) proposing a delay analysis in order to justify the concept of latency awareness in translucent WDM networks. The results show that for all traffic load values, PLI-SQDARWA outperforms COR2P in terms of connection blocking and number of network components.…”

Limited Range Wavelength Converter Based PLI-Signal Quality RWA (PLI-SQRWA) Algorithm for Translucent Optical Wavelength Division Multiplexed (WDM) Networks

“…In [12], we introduced the innovative PLI-signal quality and delay aware RWA (PLI-SQDARWA) algorithm. In contrast to existing studies which are based on traditional shortest path routing protocols, PLI-SQDARWA is founded on a signal quality and delay aware routing (SQDAR) algorithm, which evaluates candidate routes considering both, signal quality and end-to-end delay.…”