Abstraction and control of multi-domain disaggregated OpenROADM optical networks

Several models are possible within the disaggregation trend in optical transport networks, allowing more flexible, reconfigurable and elastic architectures [1], such as a partial disaggregation based on white boxes, where different optical network elements (such as ROADMS [2][3], transponders, line amplifiers, etc.) can be provided by different vendors. Additionally, and in order to scale, operators often segment their networks into domains, and the control of multi-domain transport networks commonly relies on hierarchical control models with a hierarchy of controllers [4]. Finally, the need virtualize the transport network has emerged as a key requirement to support functions such as network slicing and empower end users or to control the allocated partitions [5][6][7]. In this regard, questions related to the efficient and optimal abstraction of the underlying networks or how to support virtualization and slicing remain open.