OSNR-based backup path protection algorithm with sharing limits

We present a novel shared backup path protection algorithm for all-optical networks which considers the physical layer impairments and limits for the number of times that a backup wavelength can be used to protect a set of active lightpaths. More-over, we propose a strategy to evaluate the trade-off between the vulnerability ratio, protection ratio and blocking probability using the dominance criterion. Our proposal outperformed three other well known approaches presented in the literature.