Title :
New simple method for measuring the mode spot size in monomode fibres
Author :
Pocholle, J.P. ; Auge, Jorg
Author_Institution :
Thomson-CSF, Laboratoire Central de Recherches, Orsay, France
Abstract :
The equivalent step index (ESI) parameters associated with single-mode fibres can be evaluated by observing the changes in transmitted power on the far field when a Ronchi ruling is inserted between the end face of the fibre and a detector collecting the output intensity. Measurements as a function of wavelength allow one to determine the cutoff wavelength, ESI parameters for short lengths of fibre and effective cutoff wavelength for long lengths.
Keywords :
optical fibres; optical variables measurement; Ronchi ruling; cutoff wavelength; equivalent step index parameters; far field; mode spot size; monomode fibres; optical fibre; single-mode fibres;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19830133
