DKE German Commission for Electrical, Electronic & Information Technologies of DIN and VDE
DIN EN 60793-1-43
; VDE 0888-243:2015-12
Optical fibres - Part 1-43: Measurement methods and test procedures - Numerical aperture measurement (IEC 60793-1-43:2015); German version EN 60793-1-43:2015
Lichtwellenleiter - Teil 1-43: Messmethoden und Prüfverfahren - Numerische Apertur (IEC 60793-1-43:2015); Deutsche Fassung EN 60793-1-43:2015
Overview
This part of IEC 60793 specifies uniform requirements for measuring the numerical aperture of optical fibre, thereby assisting in the inspection of fibres and cables for commercial purposes. The numerical aperture (NA) of categories A1, A2, A3 and A4 multimode fibre is an important parameter that describes a fibre's light-gathering ability. It is used to predict launching efficiency, joint loss at splices, and micro/macrobending performance. The numerical aperture is defined by measuring the far-field pattern (NAff). In some cases the theoretical numerical aperture (NAth) is used in the literature, which can be determined from measuring the difference in refractive indexes between the core and cladding. Ideally these two methods should produce the same value. The responsible committee is Subcommittee DKE/UK 412.6 "Lichtwellenleiter und Lichtwellenleiterkabel" ("Fibres and cables") of the DKE (German Commission for Electrical, Electronic and Information Technologies) at DIN and VDE.
