Abstract

Index profiling is an essential measurement for optical fibres and preforms, since the index profile vitally affects system performance. Methods for determining diameter and NA that do not involve profile measurement are inevitably open to question, and similar difficulties arise with such parameters as eccentricity. With the increasing importance of monomode fibres in systems, the need for high resolution in fibre profiling is growing. Its significance and the growing technical needs of users are tending to keep up pressure for better and more convenient profiling methods.