Duhamel, ChristopheMahey, PhilippeMartins, Alexandre XavierSaldanha, Rodney RezendeSouza, Maurício Cardoso de2018-01-182018-01-182016DUHAMEL, C. et al. Model-hierarchical column generation and heuristic for the routing and wavelength assignment problem. 4OR, Berlin, v. 14, p. 201-220, 2016. Disponível em: <https://link.springer.com/article/10.1007/s10288-016-0309-z>. Acesso em: 02 out. 2017.1614-2411 http://www.repositorio.ufop.br/handle/123456789/9284The routing and wavelength assignment (RWA) problem typically occurs in wavelength division multiplexing optical networks. Given a number of available wavelengths, we consider here the problem of maximising the number of accepted connections with respect to the clash and continuity constraints. We first propose a new strategy which combines two existing models. This leads to an improved column generation scheme. We also present two heuristics to compute feasible solutions: a hybrid heuristic and the integer solution at the root node of the column generation. Our approaches are compared with the best existing results on a set of classic RWA instances.en-USrestritoRouting and wavelength assignmentOptical networksColumn generationArtigo publicado em periodicohttps://link.springer.com/article/10.1007/s10288-016-0309-zhttps://doi.org/10.1007/s10288-016-0309-z