A post-optimization method for the routing and wavelength assignment problem applied to scheduled lightpath demands

Lucile Belgacem, Irène Charon and Olivier Hudry

European Journal of Operational Research, 2014, vol. 232, issue 2, 298-306

Abstract: We consider here a NP-hard problem related to the Routing and Wavelength Assignment (RWA) problem in optical networks, dealing with Scheduled Lightpath Demands (SLDs). An SLD is a connection demand between two nodes of the network, during a certain time. Given a set of SLDs, we want to assign a lightpath, i.e. a routing path and a wavelength, to each SLD, so that the total number of required wavelengths is minimized. The constraints are the following: a same wavelength must be assigned all along the edges of the routing path of any SLD; at any time, a given wavelength on a given edge of the network cannot be used to satisfy more than one SLD. To solve this problem, we design a post-optimization method improving the solutions provided by a heuristic. The experimental results show that this post-optimization method is quite efficient to reduce the number of necessary wavelengths.

Keywords: Combinatorial optimization; WDM optical networks; Routing and Wavelength Assignment Problem (RWA); Scheduled Lightpath Demands (SLDs); Post-optimization (search for similar items in EconPapers)
Date: 2014
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Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:ejores:v:232:y:2014:i:2:p:298-306

DOI: 10.1016/j.ejor.2013.06.050

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