Abstract
We examine how datarate-adaptive transceivers can be used to follow
the pronounced variations in requested bandwidth in core networks and therefore
allow significant energy savings compared to static networks configured to
support the peak traffic all the times. We investigate two schemes for datarate
adaptation in optical transceivers: modulation-format adaptation and symbol-rate
adaptation, and show how they yield comparable energy savings but through
very different mechanisms. We quantify these energy savings with respect to
static networks for the case of a European backbone network and find potential
for up to 30% of savings when the two schemes are combined.
© 2012 IEEE
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