Fig. 1: Modelling validation.
From: Broadband optical fibre with an attenuation lower than 0.1 decibel per kilometre
a, Scanning electron microscope (SEM) image of the cross section of one of the DNANFs used to calibrate our loss model. In red, the automatic edge extraction of the tubular resonators used to inform simulations. b, Measured loss of the same fibre and simulation of its leakage, surface scattering and microbend loss. The total simulated loss shows good agreement with the measurement in both the first (right) and second (left) antiresonant windows, despite being dominated by different mechanisms.
