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The OpenFlow technology has been recently introduced on packet switching networks and
significant efforts are going on to implement OpenFlow also on circuit switching optical
networks. In particular, OpenFlow implementations on packet switching network rely on
monitoring facilities which, so far, still have to be defined and exploited in optical networks.
Effective monitoring facilities are required for efficient optical path computation and
management purposes. This is particularly important for the emerging flexible optical
networks, based on high bit-rates and advanced transmission technologies, including
complex modulation formats and coherent detection strategies.
In this thesis, the OpenFlow packet switching monitoring facilities have been exploited and
extended for flexible optical networks. In particular, OpenFlow open source software,
controller (NOX) and switch (Stanford implementation) have been enhanced to introduce
OpenFlow monitoring facilities for flexible optical network. This implementation gives
advantage over already implemented monitoring architectures for optical networks by
providing, in a unique architecture, both monitoring information and path computation
capabilities. This has the potential to improve the overall network efficiency, having real
time impairment information at the time of path computation. A proof of concept
demonstration has been realized, showing the capability to enable effective correlation of
retrieved monitoring information for failure localization and efficient path computation
purposes.