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Currently, telecommunication networks have been reported to account for 1-10% of the world's energy consumption. Given the ever increasing demand for Internet traffic, this figure is expected to keep growing. As a result, taking into account energy consumption is key in the design of next-generation networks. Core networks are at this moment migrating from static to dynamic WDM networks. Dynamic networks allocate network resources only when and where necessary, such that more users may use the same network with reduced resources. This effect is clearly observed in networks with wavelength conversion. In networks without wavelength conversion, the benefits of dynamic operation appear only at low traffic loads (<0.3-0.4).
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