Time-Expanded ?OTDR Based on Orthogonal Polarization Frequency Comb Generation - Sevillano, P.; Preciado-Garbayo, J.; Izquierdo, D.; Soriano-Amat, M.; Martin-Lopez, S.; Gonzalez-Herraez, M.; Fernandez-Ruiz, M.R. (Journal of Lightwave Technology, 2024)