SNR enhancement in TE-? OTDR via multi Nyquist zone averaging - Soriano-Amat, M.; Sasikumar, N.; Escobar-Vera, C.; Srinivasan, B.; Martin-Lopez, S.; Gonzalez-Herraez, M.; Fernández-Ruiz, M.R. (2024 IEEE Sensors Applications Symposium, SAS 2024 - Proceedings, 2024)