Algoritmo de Restauração Baseado em OSNR para Resiliência de Redes Ópticas Contra Falhas em Nó (OSNR-based Restoration Algorithm for Optical Network Resilience to Node Failures)

Rodrigo Choji Freitas (rchoji@yahoo.com.br)1, Joaquim Ferreira Martins (jfmf@ufpe.br)1, Carmelo José Albanez Bastos (carmelofilho@poli.br)2, Helder Alves Pereira (helder.pereira@poli.br)2, Daniel Augusto Ribeiro Chaves (danielchaves@poli.br)2, Edluce Santos Leitão (esle.pdd@uea.edu.br)3, Rodrigo César Lira Silva (rcls@ecomp.poli.br)2


1Universidade Federal de Pernambuco
2Universidade de Pernambuco
3Universidade do Estado do Amazonas

This paper appears in: Revista IEEE América Latina

Publication Date: June 2012
Volume: 10,   Issue: 4 
ISSN: 1548-0992


Abstract:
In this paper we propose a novel algorithm to restore calls upon a single node failure in all-optical networks. Our proposal aims to restore the maximum number of disrupted lightpaths by each node failure. The algorithm performs a path restoration searching for the route that presents the higher optical signal-to-noise ratio (OSNR). We compared our proposal to three other well-known approaches found in the literature, in two different network topologies. We observed that our proposal obtained lower failure rates in the restoration process for six different analyzed scenarios, considering several physical layer impairments.

Index Terms:
All-optical networks, physical layer impairments, restoration, survivability, single node failure   


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