Offline Impairment Aware RWA Algorithms for Cross-Layer Planning of Optical Networks

Abstract

Transparent optical networks are the enabling infrastructure for converged multi-granular networks in the Future Internet. The cross-layer planning of these networks considers physical impairments in the network layer design. This is complicated by the diversity of modulation formats, transmission rates, amplification and compensation equipments, or deployed fiber links. Thereby, the concept of Quality of Transmission (QoT) attempts to embrace the effects of the physical layer impairments, to introduce them in a multicriterium optimization and planning process. This paper contributes in this field by the proposal and comparative evaluation of two novel offline impairment aware planning algorithms for transparent optical networks, which share a common QoT evaluation function. The first algorithm is based on an iterative global search driven by a set of binary integer linear programming formulations. Heuristic techniques are included to limit the binary programming complexity. The second algorithm performs different pre-orderings of the lightpath demand, followed by a sequential processing of the lightpath demands. The performance and the scalability of both approaches are investigated. Results reveal great scalability properties of the global search algorithm, and a performance similar to or better than the sequential schemes.

Mixed line rate virtual topology design considering nonlinear interferences between amplitude and phase modulated channels

“…We investigate the MLR planning using as a case of study the Abilene network (|N | = 9 nodes) [27] using 80 wavelengths per fiber and a grid spacing of 50 GHz. The algorithms have been implemented in MATLAB code, integrated and tested in the MatPlanWDM tool [28], which links to the TOMLAB/ CPLEX solver [29].…”

Experimental Demonstration of Centralized and Distributed Impairment-Aware Control Plane Schemes for Dynamic Transparent Optical Networks

“…In particular, Q-Tool is the module within NPOT that quantifies the impact of the PLIs on the lightpaths' QoT. Using a method that combines numerical simulations and analytical approximations, the Q-Tool considers the dominant linear and non-linear PLIs [7], whose effect is reflected in the estimated Q-factor. The same QoT estimator is used in the distributed scheme.…”

Performance enhancement for impairment-aware SRLG failure protection in wavelength-routed optical networks

“…In terms of physical impairment in WDM networks, recent studies were mainly focusing on physical impairment-aware routing and wavelength assignment (RWA) for connection requests [2,4,[11][12][13][14]. The problem of impairment-aware dedicated path protection [9] and multiple paths provisioning [15] have been studied and corresponding heuristic algorithms have been evaluated.…”