Gini, E.Spiekman, L.H.van Brug, H.Vinchant, J.-F.Morasca, S.Pozzi, F.De Bernardi, C.Zengerle, R.Weiershausen, W.Noell, W.Thévenaz, L.Küng, A.Enard, A.Vodjdani, N.2015-11-112015-11-112015-11-111994https://infoscience.epfl.ch/handle/20.500.14299/120556The results of round-robin measurements of waveguide loss and integrated mirror reflectivity in several European laboratories in the frame of the COST 240 project are presented. The Fabry-Perot cavity contrast method was used on semiconductor optical waveguides. The measured losses show a satisfactory agreement (within 0.5 dB) between all the laboratories, but also point out some aspects which must be taken into account to get meaningful data.text::conference output::conference proceedings::conference paper