Markiewicz, K.Kaczorowski, J.Yang, Z.Szostkiewicz, L.Dominguez-Lopez, A.Wilczynski, K.Napierala, M.Nasilowski, T.Thévenaz, Luc2020-03-172020-03-172020-03-172020-03-1610.1063/1.5138728https://infoscience.epfl.ch/handle/20.500.14299/167343Standard multimode optical fibers normally support transmission over some 100 modes. Large differences in the propagation constant and the spatial distribution of distinct modes degrade the performance of phase-sensitive optical time-domain reflectometry measurements. In this work, we present a new realization of a coherent time-domain interrogation technique using single-mode operation in multimode fibers. We demonstrate effectively distributed strain sensing on three different multimode optical fibers. Up to 4 km of multimode fiber has been correctly interrogated, featuring a spatial resolution of 20 cm.Strain measurementTime domain reflectometryOptical fibersFiber optical scatteringtext::journal::journal article::research article