IEC 60793-2-2015 pdf free download.Optical fibres – Part 2: Product specifications – General.
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, 731-02-031
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 deletedj
3.3 tore
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
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 addedj
3.6 fibre buffer
material or assembly of materials used to protect the optical fibre against physical damage
[SOURCE: IEC 60050-731:1991, 731.02-56J
3.7 coloured coating andlor 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 . the refractive index profile parameter, see Table 2.IEC 60793-2 pdf download.