Candidate: Zening Li
Date: October 19, 2026
Time: 11:00 AM
Location: Online
Supervisor: Pin-Han Ho
All are welcome!
Abstract:
This seminar investigates the characterization and detectability of nominal and anomalous performance monitoring (PM) behavior in the electrical layer of optical transport networks (OTNs) under partial observability. The focus is on window-aggregated PM observations, where the underlying impairment evolution is not directly observable and service-path semantics, including impairment propagation and signal regeneration, affect the interpretation of observed PM behavior. A Topology-Constrained Partially Observed Dynamical System (TC-PODS) is developed as a generative reference for characterizing topology-consistent nominal PM behavior and defining structural anomalies as persistent incompatibilities with nominal generation. Building on this reference, a Detectability Analysis Framework is developed to characterize observation-induced detectability loss and to evaluate the extent to which topology-consistent evidence aggregation can recover lost detectability. The results show that the PM observation process can substantially reduce anomaly detectability, while topology-consistent evidence aggregation provides measurable but bounded recovery. Under active signal regeneration, recoverable anomaly evidence becomes asymmetrically distributed across propagation-consistent segments. These findings demonstrate that PM-based anomaly detection should be considered not only in terms of downstream detector design, but also in relation to the observation process and service-path semantics that determine the anomaly evidence available for detection.