Migration Strategy from C-Band Elastic Optical Network to C+L Multiband Optical Network

Abstract

Multi-band elastic optical network (MB-EON) is a promising technology to extend the bandwidth of the current elastic optical networks in the middle term. The migration from current networks to MB-EONs should be made carefully taking into account both the required cost and the bandwidth requirements. This paper focuses on the necessity of looking for a trade-off between the links to be upgraded during the migration from the standard C-band to the L-band and the acceptable level of capacity increase. Therefore, it makes two contributions to efficiently upgrade current elastic optical networks: firstly, a planning method to decide which fibers should be upgraded to exploit C+L band; and second, one heuristic for solving the routing, band, modulation level, and spectrum assignment (RBMLSA) problem during network operation. Simulation results demonstrate that, thanks to use of these proposals, the upgrade of a set of the fibers could be viewed as a fully convincing middle term solution by the network operators to get around the huge cost of the whole network migration to C+L line system.

Migration of elastic optical networks to the C + L-bands subject to a partial upgrade of the number of erbium-doped fiber amplifiers

“…These last works, [30,31], assume an incremental traffic model, where new connections are established, but once established are never released. In [32], we proposed a heuristic algorithm for gradually upgrading the fibers of a network to support the C + L-bands. In contrast to [30,31], we assumed a dynamic traffic model, where connections are established but also released on user demand, and demonstrated that the supported traffic load can be significantly increased with a partial upgrade of the network links.…”

“…Moreover, we also proposed and compared two heuristics to solve the RBMLSA problem. Then, in [33], we introduced a novel integer linear programming (ILP) formulation to determine the set of fibers that should be upgraded to the C + L-bands (subject to a constraint on the maximum number of fibers that should be migrated), which generally outperforms the proposal in [32].…”

“…In the above studies [29][30][31][32][33], the cost of upgrading an existing fiber to the L-band is assumed to be the same. However, if the EDFAs in the network were originally deployed to support only the C-band, that is not the case.…”

Análise de Desempenho de Estratégias de Alocação de Banda em uma Rede Óptica Elástica Multibanda

“…Na literatura, observam-se estratégias de alocação de banda em redes ópticas MB que utilizam atribuições fixas [2]- [4], [7]- [9], heurísticas [10]- [13] e técnicas de inteligência artificial [6], [14], [15]. Além disso, algumas consideram penalidades físicas por meio de modelagens analíticas [2]- [4], [9], [13] e outras por meio do alcance máximo [6], [7], [10], [11], [14], [15].…”

“…Uzunidis et al [3] propuseram um algoritmo de roteamento, atribuição de modulação e espectro, estimando o impacto das penalidades físicas nas bandas de transmissão O, S, C e L. Para a etapa de alocação de banda, os autores seguiram a sequência: O → C → L → S. Hosseini et al [7] propuseram uma heurística para resolver o problema de roteamento, alocação de formato de modulação, banda e espectro (RMLBSA -Routing, Modulation Level, Band and Spectrum Assignment). Para isso, utilizaram o algoritmo que pré-selecionava k rotas para qualquer solicitação de chamada e, em um cenário de atualização da banda C para incluir também a banda L, a banda L tinha preferência no estabelecimento das chamadas desde que todos os enlaces da rota possuíssem fibras ópticas com dispositivos nas duas bandas.…”