Abstract
To improve the energy efficiency of optical networks,
strategies and technologies should aim at ensuring a
(low) power consumption proportional to the network
utilization. To achieve such aim, this paper proposes
the support of sleep mode in the links of a
wavelength-switched optical network with generalized
multiprotocol label switching control plane. A
centralized strategy (to be performed at the Path
Computation Element-PCE) and a distributed strategy are
proposed to dynamically select the link to be set to
sleep. Performance of the proposed strategies is
evaluated for different parameter settings. Results show
a significant reduction of the overall power drained by
the optical devices with both strategies and a contained
impact on lightpath blocking probability. The tradeoff
between blocking and energy saving of the two strategies
is discussed to derive the most energy-efficient and
energy-proportional strategy, with negligible impact on
the quality of service.
© 2011 IEEE
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