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Optical communications and networking are fast becoming the solution tosupport ever-increasing data traffic across all segments of the network,expanding from core/metro networks to 5G/6G front-hauling. Therefore, opticalnetworks need to evolve towards an efficient exploitation of the infrastructureby overcoming the closed and aggregated paradigm, to enable apparatus sharingtogether with the slicing and separation of the optical data plane from theoptical control. In addition to the advantages in terms of efficiency and costreduction, this evolution will increase the network reliability, also allowingfor a fine trade-off between robustness and maximum capacity exploitation. Inthis work, an optical network architecture is presented based on the physicallayer digital twin of the optical transport used within a multi-layerhierarchical control operated by an intent-based network operating system. Anexperimental proof of concept is performed on a three node network including upto 1000 km optical transmission, open re-configurable optical add & dropmultiplexers (ROADMs) and white-box transponders hosting pluggable multi-ratetransceivers. The proposed solution is based on GNPy as optical physical layerdigital twin and ONOS as intent-based network operating system. The reliabilityof the optical control decoupled by the data plane functioning isexperimentally demonstrated exploiting GNPy as open lightpath computationengine and software optical amplifier models derived from the componentcharacterization. Besides the lightpath deployment exploiting the modulationformat evaluation given a generic traffic request, the architecture reliabilityis tested mimicking the use case of an automatic failure recovery from a fibercut.

Experimental Demonstration of Partially Disaggregated Optical Network Control Using the Physical Layer Digital Twin