The unprecedented growth of the global Internet traffic, coupled with the large spatio-
temporal fluctuations that create, to some extent, predictable tidal traffic conditions, are …

A detailed survey of approaches reducing energy consumption of core networks is
presented in this paper. We consider a multilayer architecture, in which the optical layer can …

In this paper, we present an original work on sub-wavelength optical switching performed
over a coherent multi-band orthogonal frequency-division multiplexing (MB-OFDM) super …

An optical network, like any system, has to be observable before it can become subject to
optimization, and this is the main capability that ORCHESTRA project introduces …

This chapter discusses the changes in technology option or design to support the elastic
concept in an optical network. Next, it introduces in detail some practical aspects of the …

Worldwide operator deployment of high-speed 100G coherent optical networks is currently
underway. To ensure a competitive solution offering significant performance improvements …

Transient traffic spikes are becoming a crucial challenge for network operators from both
user-experience and network-maintenance perspectives. Different from long-term traffic …

The growing popularity of high-speed mobile communications, cloud computing, and the
Internet of Things (IoT) has reinforced the tidal traffic phenomenon, which induces spatio …

Since the deployment of the first commercial polarization-multiplexed (PM) QPSK 100G
systems, the evolution of coherent optical communications in the last decade has been …

Core networks offer high capacities, thanks mainly to the optical technologies they utilize,
but they consume a non-negligible amount of energy. The traffic volume in metro and core …