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BS EN 60793-1-43:2015 – TC:2020 Edition

BS EN 60793-1-43:2015 – TC:2020 Edition

$186.33

Tracked Changes. Optical fibres – Measurement methods and test procedures. Numerical aperture measurement

Published By Publication Date Number of Pages
BSI 2020 55
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IEC 60793-1-43:2015 establishes 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. This second edition of IEC 60793-1-43, together with other standards in the IEC 60793-4X series, cancels and replaces the first edition of IEC 60793-1-43, published in 2001, and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: – expansion of the scope to include A1, A2, A3 and A4 multimode fibre categories; – addition of measurement parameters of sample length and threshold values, product specific to the variables that are now found in the product specifications; – a new Annex B entitled ‘Product specific default values for NA measurement’; – addition of a new Technique 4 for measuring NA of A4d fibres; – a new Annex A entitled ‘Mapping NA measurement to alternative lengths’ that gives a mapping function to correlate shorter sample length measurements to the length suggested in the reference test method Naff. Keywords: numerical aperture of optical fibre, inspection of fibres and cables This publication is to be read in conjunction with /2, /2 and /2.

PDF Catalog

PDF Pages PDF Title
37 CONTENTS
39 FOREWORD
41 1 Scope
2 Normative references
3 Overview of method
42 4 Reference test method
Figures
Figure 1 – Representative refractive index profile for a graded index multimode fibre
43 5 Apparatus
5.1 Input system
5.1.1 Light source
5.1.2 Input optics
5.1.3 Fibre input end support and alignment
5.1.4 Cladding mode stripper
5.2 Output system and detection
5.2.1 General
44 5.2.2 Technique 1 – Angular scan (see Figure 2)
Figure 2 – Technique 1 – Angular scan
45 5.2.3 Technique 2 – Angular scan (see Figure 3)
5.2.4 Technique 3 – Scan of the spatial field pattern (see Figure 4)
Figure 3 –Technique 2 – Angular scan
46 Figure 4 – Technique 3 – Scan of the spatial field pattern
47 5.2.5 Technique 4 – Inverse far-field measurement (see Figure 5, applicable to subcategory A4d fibres)
48 6 Sampling and specimens
6.1 Specimen length
6.2 Specimen endface
7 Procedure
8 Calculations
8.1 Far-field versus maximum theoretical value
Figure 5 – Technique 4 – Inverse far-field method
49 8.2 Threshold intensity angle, θk
8.3 Numerical aperture, NAff
Figure 6 – Example of a far-field NA measurement
50 8.4 Calculating far-field intensity pattern when using Technique 3
8.5 Calculating NA when using Technique 4
9 Results
9.1 Information available with each measurement
Figure 7 – Sample output of an A4d fibre measured using Technique 4
51 9.2 Information available upon request
10 Specification information
52 Annex A (informative)Mapping NA measurement to alternative lengths
A.1 Introductory remark
A.2 Mapping long length NAff measurement to short length NAff measurement
53 Annex B (normative)Product specific default values for NA measurement
B.1 Introductory remark
B.2 Table of default values used in NA measurement for multimode products
Table B.1 – Default values for parameters used in the far-field NA measurement of multimode fibres

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BS EN 60793-1-43:2015 - TC
$186.33