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This Document Has Been Superseded
A newer publication replaces it: BSI BS EN 60793-1-20, BSI BS EN IEC 60793-2-40
Optical fibres -- Product specifications. Sectional specification for category A4 multimode fibres
This part of IEC 60793‑2 is applicable to category A4 optical multimode fibres and the related sub-categories A4a, A4b, A4c, A4d, A4e, A4f, A4g and A4h.
These fibres have a plastic core and plastic cladding and may have step-index, multi-step index or graded-index profiles. The fibres are used in information transmission equipment and other applications employing similar light transmitting techniques, and finally in fibre optic cables.
Table 1 summarizes some of the salient characteristics and applications of these fibres.
| Sub-category | A4a | A4b | A4c | A4d | A4e | A4f | A4g | A4h |
|---|---|---|---|---|---|---|---|---|
| Core diameter (µm) | See Note 1 | See Note 1 | See Note 1 | See Note 1 | ≥ 500 | 200 | 120 | 62,5 |
| Cladding diameter (µm) | 1 000 | 750 | 500 | 1 000 | 750 | 490 | 490 | 245 |
| Numerical aperture Naff | 0,50 | 0,50 | 0,50 | 0,30 | 0,25 | 0,190 | 0,190 | 0,190 |
| Operating wave-length (s) (nm) | 650 See Note 2 |
650 | 650 | 650 | 650 | 650 850 1 300 |
650 850 1 300 |
850 1 300 |
| Applications | Digital audio interface, automobile, industrial, sensor and data transmission | Industrial and sensor | Sensor | Digital audiovisual interface and data transmission | Digital audiovisual interface and data transmission | Industrial and mobile; compatible with A3 transmission equipment | Data transmission | Data transmission; primarily used in ribbon structures |
Typically 15 µm to 35 µm smaller than the cladding diameter.
Other potential wavelengths for A4a fibre are described in Annex J.
In addition to the applications shown in Table 1, other applications for A4 fibres include, but are not restricted to, the following:
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