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The authors present a lab-trial of the designed and implemented path computation architecture for multi-domain translucent Wavelength Switched Optical Networks (WSON), using Hierarchical Path Computation Elements (H-PCE). The approach is based on the dynamic aggregation of the domain topologies, represented as a virtual link meshes at a higher level, in order to perform dynamic domain sequence selection. They detail the extended path computation procedures, involving both domain selections considering inter domain links and segment expansions which are impairment-aware, along with the proposed control plane protocol extensions. They validate the approach with the overall performance of the end to end path computation latency, highlighting the benefits of parallelization.
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