G.657.A (A1 or A2)

The characteristics of a bending-loss insensitive single-mode optical fibre and cable for the access network. ITU-T G.657.A1and ITU-T G.657.A2 fibres are fully compliant with ITU-T G.652.D

FIBRE ATTRIBUTES DETAIL VALUE
Mode field diameter Wavelength
Range of nominal values
Tolerance		 1310 nm
8.6-9.2 μm
lyP 0.4 μm
Core concentricity error Maximum 0.5 μm
Cladding non-circularity Maximum 1.0%
Cable cut-off wavelength Maximum 1260 nm
G.657. A1     G.657. A2
Macrobend loss Radius
Number of turns
Maximum at 1550 nm
Maximum at 1625 nm		 15        10        15        10        7.5
10          1         10          1          1
0.25      0.75      0.03      0.1       0.5
1.0        1.5        0.1        0.2        1.0
Proof stress Minimum 0.69 GPa
Chromatic dispersion λ0min 1300 nm
Coefficient λ0max
S0min
S0max		 1324 nm
0.073 ps/nm2·km
0.092 ps/nm2·km
CABLE ATTRIBUTES DETAIL VALUE
Attenuation coefficient Maximum from 1310 nm to 1625 nm
Maximum at 1383 ± 3 nm after hydrogen ageing
Maximum at 1530 – 1565 nm		 0.4 dB/km
0.4 dB/km

0.30 dB/km
PMD coefficient M
Q
Maximum PMDQ		 20 cables
0.01%
0.2 ps/√km
  • G655C_1

Relevant specified bending radii for ITU-T G.652 and ITU-T G.657