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Traffic grooming, i.e. the aggregation of multiple traffic streams on one channel or wavelength, has often been considered in the context of reducing blocking and improving capacity utilization. More recently, traffic grooming has also been advocated in the context of energy-aware routing. In this paper we study energy-efficient path selection under the scheduled traffic model in IP-over-WDM optical networks. We show that there is indeed a strong relation between traffic grooming and energydoi:10.1109/scvt.2011.6101312 dblp:conf/scvt/YangK11 fatcat:hhz6a3ixfrazrbrqke7j66plbq