Analysis of performance degradation in sleep-mode enabled core optical networks [invited]


Energy potency is an important target for the management of wavelength-division-multiplexing-primarily based core optical networks. A possible power management strategy for energy-economical optical networks consists in putting opto-electronic devices (transponders and regenerators) into a coffee power mode, referred to as sleep or idle, or even turning them off, during low traffic periods. It has been shown that sleep-mode enabled transponders and regenerators yield to substantial energy savings; but, their nonnegligible wake-up time might degrade the network performance in terms of the blocking likelihood of the connections. Opaque networks, in which transponders are utilised at every node in the top-to-end path, are especially liable to such degradations since multiple network nodes might simultaneously exhaust their pool of transponders because of long wake-up times, increasing the blocking likelihood. On the other hand, these degradations are less severe in transparent networks. During this paper, we have a tendency to evaluate how the length of the wake-up time affects the performance of the network in terms of blocking chance depending on its architecture (clear, translucent, or opaque) and the dynamicity of the traffic. Additionally, we tend to propose a unique routing algorithm to mitigate the blocking chance thanks to the wake-up time. The benefits of the proposed algorithm are highlighted through extensive results.

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