PD IEC TR 62000:2021

Guidelines for combining different single-mode fibre sub-categories. | Status: Current

1 Scope This document provides guidelines concerning single-mode fibre inter-compatibility. A given category of single-mode fibre, for example B-655, can have different implementations by suitably optimising several of the following parameters: mode field diameter (hence effective area), chromatic dispersion coefficient, slope of the chromatic dispersion curve, cable cut-off wavelength. These guidelines indicate the items that are taken into account when planning to connect

1. 1) different implementations of single-mode fibres of the same category, for example different implementations of Class B single-mode fibres, and
2. 2) single-mode fibres of different sub-categories, for example B-652.B with B-655.C.

See IEC 60793‑2‑50 for the attributes and definitions of single-mode fibre. The attributes and definitions of fibres covered in this document are given in Table 1. Table 1 — Correspondence table of various single-mode fibres Common name Use (IEC 60793‑2‑50) IEC sub-category ITU-T Recommendation Dispersion unshifted fibre Optimised for use in the 1 310 nm region but can be used in the 1 550 nm region. B-652.B G.652.B Extended band dispersion unshifted fibre Optimised for use in the 1 310 nm region but can be used in the O, E, S, C and L-band (i.e. throughout the 1 260 nm to 1 625 nm range). B-652.D G.652.D Dispersion shifted fibre Optimised for single channel transmission in the 1 550 nm region. Multiple channels can only be transmitted if care is taken to avoid non-linear effects such as four wave mixing by, for example, moderating the power levels or appropriate spacing or placement of the channels. B-653.A G.653.A B-653.B G.653.B Cut-off shifted fibre Optimised for low loss in the 1 550 nm region, with cut off wavelength shifted above the 1 310 nm region. B-654.A G.654.A B-654.B G.654.B B-654.C G.654.C B-654.D G.654.D B-654.E G.654.E Non-zero dispersion-shifted fibre Optimised for multiple channel transmission in the 1 530 to 1 625 nm region with a positive or negative, non-zero chromatic dispersion and a cut off wavelength that can be shifted above the 1 310 nm region. B-655.C G.655.C B-655.D G.655.D B-655.E G.655.E Wideband non-zero dispersion-shifted fibre Optimised for multiple channel transmission in the wavelength range of 1 460 nm to 1 625 nm with the positive value of the chromatic dispersion coefficient that is greater than some non-zero value over the same wavelength range. B-656 G.656 Bending loss insensitive fibre Bending loss insensitive single-mode fibre suitable for use in the access networks, including inside buildings at the end of these networks. They are suitable to be used in the O, E, S, C and L-band (i.e. throughout the 1 260 nm to 1 625 nm range) and, in the case of B-657.A1 and B-657.A2, meet the requirements of B-652.D fibres. Subcategories B-657.B2 and B-657.B3 fibres are intended to be used for restricted distances (less than 1 000 m) at the end of access networks, in particular inside buildings or near buildings (e.g. outside building riser cabling). B-657.A1 G.657.A1 B-657.A2 G.657.A2 B-657.B2 G.657.B2 B-657.B3 G.657.B3 This document does not consider the connection of fibres with the same category from different manufacturers, which is already considered by the standardisation procedure.