IEC 60793-2-10-2015 pdf free download.Optical fibres – Part 2-10: Product specifications – Sectional specification for category A1 multimode fibres.
For attenuation coefficient and modal bandwidth, the family specification contains ranges of specifiable values instead of fixed limits. The actual values of the maximum attenuation coefficient and minimum modal bandwidth. at both 850 nm and 1 300 nm (or just at one of these wavelengths) are to be agreed between supplier and customer. For commercial purposes. the modal bandwidth is linearly normalized to 1 km.
For guidance purposes on bandwidth, Table H.l shows a number of internationally standardised applications supported by Al fibres, and Table H.2 gives a (limited) number of frequently used commercial bandwidth specifications for Ala and Aib fibres.
The indicated maximum attenuation values apply to uncabled optical fibres: for the maximum cabled attenuation values, reference is made to IEC 60794-1.1, which can be used in conjunction with this standard.
Remarks on the specification of modal bandwidth:
Care should be taken in writing dual wavelength bandwidth specifications. For category Al fibres, the bandwidth at 850 nm may be related to the bandwidth at 1 300 nm in a way shown
IEC 60793-2-10:2015 © IEC 2015 — 13—
in Figure 1. depending on the refractive index parameter, g. (see IEC 60793-2:2011, 51). The shaded region under the curve of Figure 1 can be defined as the dual window area, In this area, regions X, Y, and Z are examples of where a fibre manufacturer may choose to optimise the process. That is. centre the production at 850 nm. 1 300 nm, or between these two wavelengths.
Due to this optimisation of the manufacturing process. there will be combinations of bandwidth that are not possible. For example. it is practically impossible to produce a fibre with the maximum of both indicated bandwidth ranges (e.g. 800 MHz’km/l 000 MHz’km for Aib multimode fibres).IEC 60793-2-10 pdf download.