1 Scope
This technical report provides guidelines concerning single-mode fibre compatibility.
A given type of single-mode fibre, for example B4, may 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.
This guideline indicates the items that should be taken into account when planning
to connect: (1) different implementations of single-mode fibres of the same type,
e.g. different implementations of type B single-mode fibres, and (2) single-mode fibres
of different types, e.g. B1.1 with B4. See IEC 60793‑2‑50 for the attributes and definitions of single-mode fibre. The attributes and definitions
of fibres covered in this technical report are given in Table 1.
Table 1
—
Correspondence table of various single-mode fibres
| Common name | Use (IEC 6079‑2‑50) | IEC Class | ITU-T Recommendation |
|---|---|---|---|
| Dispersion unshifted single-mode fibre | Optimised for use in the 1 310 nm region but can be used in the 1 550 nm region | B1.1 | G.652 A, B |
| Cut-off shifted single-mode fibre | Optimised for low loss in the 1 550 nm region, with cut off wavelength shifted above the 1 310 nm region | B1.2 | G.654 |
| Extended band dispersion unshifted single-mode 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). | B1.3 | G.652 C, D |
| Dispersion shifted single-mode fibre | Optimised for single channel transmission in the 1 550 nm region. Multiple channels can only be transmitted if care is taken to avoid the effects of four wave mixing by, for example, moderating the power levels or appropriate spacing or placement of the channels | B.2 | G.653 |
| Non-zero dispersion-shifted single-mode fibre | Optimised for multiple channel transmission in the 1 550 nm region with a cut off wavelength that may be shifted above the 1 310 nm region | B4 | G.655 |
| Wideband non-zero dispersion-shifted single-mode fibre | Optimised for multiple channel transmission in the wavelength range of 1 460 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. | B5 | G.656 |
| Bend loss optimised |
Bending loss insensitive single-mode fibre suitable for use in the access networks,
including inside buildings at the end of these networks.
B6_a fibres 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 meet the requirements of B1.3 fibres.
|
B6_a | G.657.A |
| Bending loss insensitive single-mode fibre suitable for use in the access networks, including inside buildings at the end of these networks. | B6_b | G.657.B | |
| B6_b fibres are suitable for transmission at 1 310 nm, 1 550 nm, and 1 625 nm for restricted distances that are associated with in-building transport of signals. |
This guide does not consider the connection of fibres with the same implementation
from different manufacturers, which is already considered by the standardisation procedure.