TIA ANSI/TIA-455-177-C
IEC-60793-1-43 Optical Fibres - Part 1-43: Measurement Methods and Test Procedures- Numerical Aperture
standard by Telecommunications Industry Association , 12/03/2020
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About This Item
Full Description
This part of IEC 60793 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.
Document History
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TIA ANSI/TIA-455-177-C
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IEC-60793-1-43 Optical Fibres - Part 1-43: Measurement Methods and Test Procedures- Numerical Aperture- Most Recent
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TIA ANSI/TIA-455-177-B
FOTP-177 IEC-60793-1-43 Optical Fibres – Part 1-43: Measurement Methods and Test Procedures – Numerical Aperture- Historical Version
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TIA TIA-455-177-A
FOTP177 Numerical Aperture Measurement of Graded-Index Optical Fibers- Historical Version
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