Figure 3

Measured data for the straight fibres (red circles: mean with standard deviation, n = 10) compared to simulation results for various values of the rms roughness of the core-cladding interface Sq = [0 … 25] nm (blue dashed lines). The solid black line represents the best interpolation between the simulation for Sq = 10 nm and Sq = 15 nm based on a least-square fit for the respective fibre: 1143 (a), 1144 (b).