Answers are grounded in this paper and cite their sources.
The far-field RMS width of a single-mode fibre is shown to be related to the first derivative of the power passed through a circular aperture. This relationship allows a direct determination of Petermann's recent definition of mode field radius from data collected using the far-field variable-aperture technique.
No takes yet. Share an insight, caveat, or question.
Saravanos et al. (1985) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: