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Optical technologies, in comparison with electronic technologies, need less power to switch high bitrates and to interconnect farther subsystems. The paper discusses with specific examples how optics can improve the energy efficiency of networks and switches. Introduction Power consumption has recently emerged as a crucial problem due to increasing energy(More)
We propose an adaptive algorithm, the Energy Watermark Algorithm (EWA), to reduce the power consumption of Internet Protocol (IP)-over-Wavelength Division Multiplexing (WDM) networks. After presenting a network model and a detailed description of the EWA, we perform a sensitivity analysis and evaluate the performance of the algorithm considering real(More)
Energy saving in telecommunications networks has become a well established topic in the research community. We look at the electrical and optical layers of IP-over-WDM networks, and present a list of evaluation criteria for the Energy-Aware Adaptive Routing Solutions (EA-ARSs) from the perspective of a network operator. Furthermore, we briefly explain the(More)
—Wavelength-Routing (WR) networks are the most common solution for core networks. With the access segment moving from copper to Passive Optical Networks (PON), core networks will become one of the major culprits of Internet power consumption. However, WR networks offer some design flexibility which can be exploited to mitigate their energy requirements. One(More)
—We tackle the problem of reducing power consumption in the Internet Protocol (IP)-over-Wavelength Division Multiplexing (WDM) networks, targeting the power-aware Logical Topology Design (LTD). Unlike the previous work in the literature, our solution minimizes the power consumption and the cost (in terms of reconfigured traffic) incurred when the network is(More)
—The huge energy consumption of datacenters providing cloud services over the Internet has motivated different studies regarding cost savings in datacenters. Since energy expenditure is a predominant part of the total operational expenditures for datacenter operators, energy aware policies for minimizing datacenters' energy consumption try to minimize(More)
—We consider the power-efficient design of an Internet protocol (IP)-over-wavelength division multiplex-ing (WDM) network, tackling the problem of installing optical and IP layer equipment to satisfy traffic requirements. We take into account routing constraints and consider a comprehensive set of realistic scenarios defined by network topology, traffic(More)