G.655.C
The characteristics of a single-mode optical fibre and cable, which has the absolute value of the chromatic dispersion coefficient greater than some non-zero value throughout the wavelength range from 1530 to 1565 nm, in order to reduce the growth of non-linear effects which can be particularly deleterious in DWDM systems.
| FIBRE ATTRIBUTES | DETAIL | VALUE |
| Mode field diameter | Wavelength | 1550 nm |
| Chromatic dispersion | Range of nominal values Tolerance Nominal |
8-11 μm ± 0.4 μm 125.0 μm |
| Cladding Diameter | Tolerance Maximum |
± 1 μm 0.8 μm |
| Core concentricity error | Maximum | 1.0% |
| Cladding non-circularity | Maximum | 1450 nm |
| Cable cut-off wavelength | Radius | 30 mm |
| Macrobend loss | Number of turns Maximum at 1625 nm Minimum λmin |
100 0.50 dB 0.69 GPa 1530 nm |
| Proof stress | λmin | 1565 nm |
| Chromatic dispersion | Minimum value of Dmin | 1.0 ps/nm·km |
| coefficient | Minimum value of Dmin Dmax - Dmin Tolerance |
10.0 ps/nm·km Positive or negative ≤ 5.0 ps/nm·km |
| CABLE ATTRIBUTES | DETAIL | VALUE |
| Attenuation coefficient | Maximum at 1550 nm Maximum at 1625 nm |
0.35 dB/km 0.4 dB/km |
| PMD coefficient | M Q Maximum PMDQ Tolerance |
20 cables 0.01% 0.2 ps/√km |
Difference between G.652 and G.655