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Dynamic lightpath restoration is a key issue in Wavelength Switched Optical Networks (WSON). On the other hand, the introduction of the Path Computation Element (PCE) and the Generalized Multi-Protocol Label Switching (GMPLS) architectures into WSON as control plane technologies is expected to bring more intelligence and to enable the dynamic computation and control of end-to-end lightpaths in a cost-efficient manner. In this paper, for the first time and through a lab trial with four domains and a field trial located in Japan and Spain, the authors experimentally present PCE-based Optical Signal to Noise Ratio (OSNR)-aware dynamic restoration in multi-domain GMPLS-enabled translucent WSON, assessing the overall feasibility of the proposed techniques and quantitatively evaluating the service disruption time and path computation latency during end-to-end lightpath restoration.
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