Title :
Parallel-beam excitation method for estimating refractive-index profiles in optical fibres
Author :
Ankiewicz, A. ; Adams, M.J. ; Payne, David N. ; Sladen, F.M.E.
Author_Institution :
University of Southampton, Department of Electronics, Southampton, UK
Abstract :
A theoretical model is developed that demonstrates the presence of a ring in the far-field pattern when a graded-index fibre is excited by a collimated beam, incident at a given radius from the core centre. The angular position of tnis ring can be used to obtain an estimate of the fibre refractive-index profile, provided a correction for the finite beam spot size is applied.
Keywords :
optical fibres; refractive index; angular position; collimated beam; far field pattern; finite beam spot; graded index fibre; optical fibres; parallel beam excitation method; refractive index profile; ring;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19780547
