BS/EN 60793-2-2016 pdf download.Optical fibres Part 2 : Product specifications General.
This part of IEC 60793 contains the general specifications for both multimode and single- mode optical fibres.
Sectional specifications for each of the four categories multimode fibres: Al. A2, A3. and A4 (part of the multimode fibre class A) contain requirements specific to each category.
Sectional specifications for each of the two single-mode fibre classes. B and C, contain requirements common to each class.
Each sectional specification includes family specifications (in normative annexes) that contain requirements for the applicable category or sub-categories. These sub-categories are distinguished on the basis of different fibre types or applications.
The requirements of this standard apply to all classes.
Each sectional specification contains the requirements that are common to all the family specifications that are within it. These common requirements are copied to the family specification for ease of reference.
Tests or measurement methods are defined for each specified attribute. Where possible. these definitions are by reference to an IEC standard — otherwise the test or measurement method is outlined in the relevant sectional specification.
Table 1 defines the sectional specifications. The relevant family specifications are defined within the sectional specifications as normative annexes (see Tables 2 to 5).
Annexes A and B summarize the existing fibre specifications.
IEC 60793-1 (all parts), Optical fibres – Part 1: Measurement methods and test procedures
IEC 60793-2-10, Optical fibres – Part 2-10: Product specifications — Sectional specification for category A 1 multimode fibres
IEC 60793-2-20, Optical fibres – Part 2-20: Product specifications — Sectional specification for category A2 multimode fibres
IEC 60793-2-30, Optical fibres – Part 2-30: Product specifications — Sectional specification for category A3 rnultimode fibres
IEC 60793-2-40. Optical fibres Part 2-40: Product specifications — Sectional specification for category A4 multimode fibres
IEC 60793-2-50. Optical fibres – Part 2-50: Product specifications — Sectional specification for class B single-mode fibres
IEC 60793-2-60, Optical fibres – Part 2-60: Product specifications — Sectional specification for category C single-mode intraconnection fibres
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
multimode fibre
optical fibre in the core of which the radiation of two or more bound modes can propagate at the wavelength of interest
[SOURCE: IEC 60050-731:1991, 731-02-03)
3.2
single-mode fibre
optical fibre in which the radiation of only one bound mode can propagate at the wavelength of interest
[SOURCE: IEC 60050-731:1991, 731-02-02. modified — Note deleted)
3.3
core
central region of an optical fibre through which most of the optical power is transmitted
3.4
cladding
dielectric material of an optical fibre surrounding the core
[SOURCE: IEC 60050-731:1991, 731 -02-051
3.5
primary coating
thin coating applied directly to the cladding, usually at the time of the fibre drawing, in one or more layers, to preserve integrity of the cladding surface
Note I to entry: A secondary coating may be applied directly to the primary coating. of one or more fibres, to reinforce the protection of the optical fibre during handling and cabling
(SOURCE: IEC 60050-731:1991. 731-02-57, modified — the phrase usually at the time .more layers and the note 1 to entry have been added]
3.6
fibre butter
material or assembly of materials used to protect the optical fibre against physical damage
(SOURCE: IEC 60050-731:1991, 731-02-56)
3.7
coloured coating and/or buffer
thin coating and/or buffer applied on the primary coating and/or buffer or on the secondary coating in order to make each fibre distinguishable by its colour
4 Quality assurance
It is the responsibility of the supplier to establish quality assurance by quality control procedures which ensures that the product meets the requirements of this standard and the related sectional specifications and family specifications. It is not intended that a complete testing programme be carried out on every length of fibre. When the customer wishes to specify acceptance tests or other quality procedures, it is essential that an agreement be reached between the supplier and the customer at the time of ordering.
5 Construction of optical fibres
5.1 Class A — Multimode fibres
The main fibre categories are based on g. the refractive index profile parameter, see Table 2. The normalized index profile is expressed as:BS/EN 60793-2-2016 pdf download.

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