Vol. 6, Issue 10, Part K (2020)

Abstract
This Paper has described how to compute the mode power distribution in step-index and parabolic-index fibres for any mode combination. It was shown that the entire leaky mode set of a graded-index fibre falls within the meridional numerical aperture for a graded-index fibre, and that leaky modes may cause distortion of the intensity profile. The use of the mode overlap integral to compute mode coupling between dissimilar fibres has been demonstrated and it was found that coupling efficiency between the modes in step and graded-index fibres of differing azimuthal mode number, was negligible. LP2, 1 Bessel Mode Laguerre-Gauss modes.