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