IEC 60793-2-50:2015 pdf download – Optical fibres – Part 2-50: Product specifications – Sectional specification for class B single-mode fibres.
1 Scope This part of IEC 60793 is applicable to optical fibre categories B1 .1 , B1 .2, B1 .3, B2, B4, B5 and B6. A map illustrating the connection of IEC designations to ITU-T designations is shown in Annex I. These fibres are used or can be incorporated in information transmission equipment and optical fibre cables. Three types of requirements apply to these fibres: – general requirements, as defined in IEC 60793-2; – specific requirements common to the class B single-mode fibres covered in this standard and which are given in Clause 5; – particular requirements applicable to individual fibre categories or specific applications, which are defined in Annexes A to G. For some fibre categories (shown in the relevant family specifications), there are sub- categories that are distinguished on the basis of difference in transmission attribute specifications. The designations for these sub-categories are documented in the individual family specifications. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60793-1 (all parts), Optical fibres – Measurement methods and test procedures IEC 60793-1 -1 , Optical fibres – Measurement methods and test procedures – Part 1-1: General and guidance IEC 60793-1 -20, Optical fibres – Part 1-20: Measurement methods and test procedures – Fibre geometry IEC 60793-1 -21 , Optical fibres – Part 1-21: Measurement methods and test procedures – Coating geometry
IEC 60793-1 -22, Optical fibres – Part 1-22: Measurement methods and test procedures – Length measurement IEC 60793-1 -30, Optical fibres – Part 1-30: Measurement methods and test procedures – Fibre proof test IEC 60793-1 -31 , Optical fibres – Part 1-31: Measurement methods and test procedures – Tensile strength
IEC 60793-1 -32, Optical fibres – Part 1-32: Measurement methods and test procedures – Coating strippability IEC 60793-1 -33, Optical fibres – Part 1-33: Measurement methods and test procedures – Stress corrosion susceptibility IEC 60793-1 -34, Optical fibres – Part 1-34: Measurement methods and test procedures – Fibre curl IEC 60793-1 -40:2001 , Optical fibres – Part 1-40: Measurement methods and test procedures – Attenuation IEC 60793-1 -42, Optical fibres – Part 1-42: Measurement methods and test procedures – Chromatic dispersion IEC 60793-1 -44, Optical fibres – Part 1-44: Measurement methods and test procedures – Cut- off wavelength IEC 60793-1 -45, Optical fibres – Part 1-45: Measurement methods and test procedures – Mode field diameter IEC 60793-1 -46, Optical fibres – Part 1-46: Measurement methods and test procedures – Monitoring of changes in optical transmittance IEC 60793-1 -47, Optical fibres – Part 1-47: Measurement methods and test procedures – Macrobending loss
IEC 60793-1 -48, Optical fibres – Part 1-48: Measurement methods and test procedures – Polarization mode dispersion IEC 60793-1 -50, Optical fibres – Part 1-50: Measurement methods and test procedures – Damp heat (steady state) tests IEC 60793-1 -51 , Optical fibres – Part 1-51: Measurement methods and test procedures – Dry heat (steady state) tests IEC 60793-1 -52, Optical fibres – Part 1-52: Measurement methods and test procedures – Change of temperature tests IEC 60793-1 -53, Optical fibres – Part 1-53: Measurement methods and test procedures – Water immersion tests IEC 60793-2, Optical fibres − Part 2: Product specifications – General IEC 60794-3, Optical fibre cables – Part 3: Outdoor cables – Sectional specification IEC TR 6231 6, Guidance for the interpretation of OTDR backscattering traces 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60793-2 and the IEC 60793-1 series apply. NOTE General definitions for fibres are provided in IEC 60793-2. The definitions of the specified attributes are contained in the relevant test methods standard of the IEC 60793-1 series, while general definitions for testing are provided in IEC 60793-1 -1 .
5 Specifications 5.1 General The fibre shall consist of a glass core and glass cladding in accordance with the construction of optical fibre class B – single-mode fibre – as given in IEC 60793-2. The term “glass” usually refers to material consisting of non-metallic oxides. The composition of some fibres may be all glass, or glass and glass/hard polymeric composites. 5.2 Dimensional requirements Relevant dimensional attributes and measurement methods are given in Table 1 . Requirements common to all categories of class B single-mode fibres are given in Table 2. Cladding diameter, cladding non-circularity, and core concentricity error shall be specified in the family specifications