The G.657.A1 fibre has optimal optical and geometrical properties that comply with and even
exceed the ITU-T recommendation G.652.D and G.657.A1. It is fully compatible with the original
G.652.D fibre, which means guaranteed fibre splicing and fusion performances, and both fibre
types fit together. For a comparison between both fibres, please check the table. The excellent
attenuation values (with no water peak at 1383 nm.) and reduced chromatic dispersion, make
the fibre suitable for long-haul 10 and 40 Gbit/s system in the full band from 1260 to 1625 nm.
Installers achieve many practical advantages with this fibre type. It generates optimal utilization
within compact splice closures and organisers. In-building cable installation is much easier
thanks to the reduced bending radius. All this will help to minimize possible installation problems.
| Fibre: | |||
| type of fibre | hydrogen passivated, dispersion unshifted, matched cladding bending loss insensitive singlemode fibre 9/125μm | ||
| Full compatible with G.652.D fibre | |||
| Optical and geometrical properties exceed ITU-recommendations G.652.D and G.657.A1 | |||
| standard | IEC-60793-2-50, B6-a1 | ||
| standard | ITU-T G.657.A1 | ||
| Characteristics: | Properties | Unit | |
| Mode field diameter | 1310 nm |
9.0 ± 0.3
|
µm
|
| 1550 nm |
10.2 ± 0.4
|
µm
|
|
| Core non-circularity |
max. 6
|
%
|
|
| Core/Cladding concentricity error |
max. 0.4
|
µm
|
|
| Cladding diameter |
125.0 ± 0.5
|
µm
|
|
| Cladding non-circularity |
max. 0.6
|
%
|
|
| Coating diameter, uncoloured |
242 ± 5
|
µm
|
|
| Coating diameter, coloured |
254 ± 7
|
µm
|
|
| Coating/Cladding concentricity error |
max. 8
|
µm
|
|
| Temperature sensitivity; -60°C to +85°C |
max. 0.05
|
dB/km
|
|
| Bending sensitivity - 10 turns around Ø30mm - 1550nm |
max. 0.1
|
dB
|
|
| Bending sensitivity - 10 turns around Ø30mm - 1625nm |
max. 0.3
|
dB
|
|
| Bending sensitivity - 1 turn around Ø20mm - 1550nm |
max. 0.75
|
dB
|
|
| Bending sensitivity - 1 turn around Ø20mm - 1625nm |
max. 1.5
|
dB
|
|
| Proof test level |
min. 0.69
|
GPa
|
|
| Fibre curl | min. 4 | m | |
| Cable cut-off wavelength | max. 1260 | nm | |
| Zero-dispersion wavelength | 1300 - 1322 | nm | |
| Zero-dispersion slope | max. 0.090 | ps/nm2.km | |
| Chromatic dispersion; 1285nm - 1330 nm | max. 3.0 | ps/nm.km | |
| Chromatic dispersion; 1550nm | max. 17.0 | ps/nm.km | |
| Chromatic dispersion; 1625nm | max. 21.0 | ps/nm.km | |
| Polarisation mode dispersion; PMDQ | max. 0.20 | ps/√km | |
| Max. attenuation at 1383nm (α1383) [note a] | < max. α1310 | ||
| Effective Group Core Refractive Index; 1310 nm | 1.465 | - | |
| Effective Group Core Refractive Index; 1550 nm | 1.465 | - | |
| Effective Group Core Refractive Index; 1625 nm | 1.465 | - | |
| note a: after hydrogen ageing | |||