The problem of determining the refractive-index profile of graded-index waveguides from the distribution of effective indices is analysed. The most common WKB-based methods appear to be rather poor in recovering smooth profiles in the case of waveguides supporting a low number of modes. A routine for the recovery of smooth refractive-index profiles of potassium-exchanged waveguides is described, which exploits accurate in-depth concentration measurements performed by secondary ion mass spectrometry. The method allows the separation of the compositional and the stress contributions to the index change of the analysed waveguides.
On the recovery of refractive-index profiles of ion-exchanged glass waveguides
GONELLA, Francesco;
1993-01-01
Abstract
The problem of determining the refractive-index profile of graded-index waveguides from the distribution of effective indices is analysed. The most common WKB-based methods appear to be rather poor in recovering smooth profiles in the case of waveguides supporting a low number of modes. A routine for the recovery of smooth refractive-index profiles of potassium-exchanged waveguides is described, which exploits accurate in-depth concentration measurements performed by secondary ion mass spectrometry. The method allows the separation of the compositional and the stress contributions to the index change of the analysed waveguides.
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