Cross-Layer Monitoring in Transparent Optical Networks
In transparent optical networks, signals propagate over all-optical lightpaths. The absence of regenerating devices that act in the electrical domain renders end-to-end monitoring difficult. Quality of Transmissions (QoT) metrics quantify the degradation in quality that a signal experiences as it traverses a lightpath. Hardware monitors that can directly measure QoT are expensive, which motivates the development of monitoring schemes that require fewer monitors but can still generate accurate QoT estimates. In this paper, the authors describe a monitoring scheme that estimates the QoT of multiple lightpaths in a network.