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About This Item
Full Description
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.
Cross References:
IEC 60793-1-1
IEC 60793-1-21
IEC 60793-1-22
IEC 60793-2-10
IEC 60793-2-20
IEC 60793-2-30
IEC 60793-2-40
EN 60793-1-1
EN 60793-1-21
EN 60793-1-22
EN 60793-2-10
EN 60793-2-20
EN 60793-2-30
EN 60793-2-40
All current amendments available at time of purchase are included with the purchase of this document.
Document History
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BS EN 60793-1-43:2015
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Optical fibres-Measurement methods and test procedures. Numerical aperture measurement- Most Recent
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BS EN 60793-1-43:2002
Optical fibres. Measurement methods and test procedures-Numerical aperture- Historical Version
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BS EN 188000:1994
Generic specification for optical fibres- Historical Version
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BS 6558-1:1985
Optical fibres and cables.-Specification for general requirements- Historical Version