Energy-efficient core networks," Optical Network Design and Modeling (ONDM), pp. 1-9, 2012. This paper has been published jointly with my supervisor Prof. Jaafar Elmirghani, Dr. Taisir Elgorashi and Mr. Ahamd Lawey who is a PhD student in our research group. This paper includes three parts: energy efficient peer-to-peer networks, energy efficient data compression in optical networks and energy efficient topology design considering embodied energy in optical networks. I contributed these two

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... s: energy efficient data compression in optical networks and energy efficient topology design considering embodied energy in optical networks. This copy has been supplied on the understanding that it is copyright material and that no quotation from the thesis may be published without proper acknowledgement.