Fig. 3: MIcroresonators created at side-coupled bent and straight optical fibres: experiment vs. theory.
From: High Q-factor reconfigurable microresonators induced in side-coupled optical fibres
a Photograph of the side-coupled fibres used in the experiment. The upper fibre is bent with a curvature radius R ~ 30 mm and the lower fibre has a curvature radius greater than 1 m. b The spectrogram measured in the vicinity of the coupling region of these fibres. c, d Spectrograms showing the magnified sections outlined in spectrogram (b). e, f Spectrograms of the microresonators numerically found in the two-mode approximation detailed in the text, which replicate the experimental spectrograms in Fig. (c and d), respectively
