Degradation detection and severity estimation by exploiting an optical time and frequency digital twin

We exploit the intrinsic advantages of a time and frequency domain digital twin to detect degradations and to estimate their severity. Noticeable performance shown for filter failures confirms the usefulness of this approach.The research leading to these results has received funding from the European Community through the MSCA MENTOR (G.A. 956713) and the H2020 B5G-OPEN (G.A. 101016663) projects, the AEI through the IBON (PID2020-114135RB-I00) project, and by the ICREA institutionPeer ReviewedPostprint (author's final draft