Fibra Optica Single Mode

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.

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
1550 nm
10.2 ± 0.4
Core non-circularity
max. 6
Core/Cladding concentricity error
max. 0.4
Cladding diameter
125.0 ± 0.5
Cladding non-circularity
max. 0.6
Coating diameter, uncoloured
242 ± 5
Coating diameter, coloured
254 ± 7
Coating/Cladding concentricity error
max. 8
Temperature sensitivity; -60°C to +85°C
max. 0.05
Bending sensitivity - 10 turns around Ø30mm - 1550nm
max. 0.1
Bending sensitivity - 10 turns around Ø30mm - 1625nm
max. 0.3
Bending sensitivity - 1 turn around Ø20mm - 1550nm
max. 0.75
Bending sensitivity - 1 turn around Ø20mm - 1625nm
max. 1.5
Proof test level
min. 0.69
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/
Chromatic dispersion; 1285nm - 1330 nm max. 3.0 ps/
Chromatic dispersion; 1550nm max. 17.0 ps/
Chromatic dispersion; 1625nm max. 21.0 ps/
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