Answers are grounded in this paper and cite their sources.
In single-mode fibres, the core diameter and refractive-index difference between core and cladding may be found from the widths of (a) the halfpower points and (b) the first minimum of the far-field radiation. The technique has been used to study the effect of heat treatment.
No takes yet. Share an insight, caveat, or question.
Gambling et al. (1976) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: