Estimating the Quality of Transmission (QoT) of lightpaths is crucial for reducing provisioned margins, making optimized dynamic decisions, and localizing failures. We leverage a QoT estimation tool that uses feedback from the network in order to provide accurate QoT estimations. We propose a scheme to establish active monitoring lightpaths (i.e., probe lightpaths used only for monitoring purposes) in order to improve the QoT estimation accuracy.
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Sartzetakis et al. (2017) studied this question.