I. Introduction
NEPHELE is a multidisciplinary European research project that aims to develop a dynamic optical network infrastructure for highly scalable, disaggregated data centers. The scalability of a traditional ‘fat tree’ data center architecture is under question today due to its non- linear expansion to cope with the steady increase of traffic [1] in cloud and other content distribution applications etc. To tackle this problem, NEPHELE proposes a novel DCN architecture that aims to overcome the limitations of traditional DC design and drastically reduce the cost and power consumption of the cloud DCs.