Research Article
ILP formulation of Signal Power Based Routing for Single and Multilayer Optical Networks
@INPROCEEDINGS{10.1109/BROADNETS.2008.4769154, author={Marcell Per\^{e}nyi and Szil\^{a}rd Zsigmond and Tibor Cinkler}, title={ILP formulation of Signal Power Based Routing for Single and Multilayer Optical Networks}, proceedings={5th International ICST Conference on Broadband Communications, Networks, and Systems}, publisher={IEEE}, proceedings_a={BROADNETS}, year={2010}, month={5}, keywords={routing signal power WDM cross-layer optimization}, doi={10.1109/BROADNETS.2008.4769154} }- Marcell Perényi
Szilárd Zsigmond
Tibor Cinkler
Year: 2010
ILP formulation of Signal Power Based Routing for Single and Multilayer Optical Networks
BROADNETS
IEEE
DOI: 10.1109/BROADNETS.2008.4769154
Abstract
In both metropolitan optical networks (MON) and long haul optical networks (LHON) the signal quality is often influenced by the physical impairments, therefore a proper impairment based routing decision is needed. In this paper we propose new routing and wavelength assignment (RWA) methods where the control plane has influence on the signal power of the Wavelength Division Multiplexed (WDM) channels. Nowadays in nearly all kinds of reconfigurable optical add-drop multiplexers (ROADM) the signal power can be tuned via variable optical attenuators (VOA) from the control plane. We give the exact integer linear programming (ILP) formulation of the method for both single and multilayer networks. In the first case we assume that no signal regeneration is allowed along the path, while in the more complex multilayer case 3R signal regeneration, grooming and wavelength conversion can all be done in the electronic layer. The proposed algorithm can be used in existing WDM optical networks where the nodes support signal power tuning. The algorithm finds the global optimum, if it exists, for a certain network topology, physical constraints and demand set.