OPTOKON

Fiber type

G.657.B3

OPK code

B3

Core

Germanium doped silica

Cladding

Silica, step index and matched clad type

Coating

Dual layers of UV-cured acrylate

Optical Characteristics

Attenuation coefficient Tight Buffered Cables (typical / max.)

at 1310 nm

0.35 / 0.40 dB/km

at 1550 nm

0.25 / 0.40 dB/km

Point of discontinuity  at 1310 nm and 1550 nm

≤ 0.1 dB

Cable cut-off wavelength (λcc)

≤ 1260 nm

Zero dispersion wavelength

1300 – 1324 nm

Zero dispersion slope

≤ 0.092 (ps/(nm2/km )

Chromatic dispersion at 1285 ~ 1330 nm

≤ 3.5 ps/(nm.km)

Chromatic dispersion at 1550 nm

≤ 18.0 ps/(nm.km)

Maximum individual fiber PMD

≤ 0.15 ps/Ökm

Fiber PMD link value

≤ 0.1 ps/Ökm

Effective group index of refraction at 1310 nm

1.467

Effective group index of refraction at 1550 nm

1.468

Backscatter coefficient at 1310 nm

-79.2 dB

Backscatter coefficient at 1550 nm

-81.7 dB

Geometrical Characteristics 

Mode field diameter at 1310 nm

8.4 ± 0.4 µm

Core/Cladding concentricity error

≤ 0.5 µm

Cladding diameter

125.0 ± 0.7 µm

Cladding non-circularity

≤ 0.7%

Primary coating diameter (uncoloured fibre)

242 ±5 µm

Primary coating diameter (coloured fibre)

250 ±10 µm

Fibre curl radius

≥ 4.0 m

Coating-Cladding concentricity

≤ 12 µm

Macrobending loss

1 turn, mandrel radius 10 mm at 1550 nm

≤ 0.03 dB

1 turn, mandrel radius 10 mm at 1625 nm

≤ 0.1 dB

1 turn, mandrel radius 7.5 mm at 1550 nm

≤ 0.08 dB

1 turn, mandrel radius 7.5 mm at 1625 nm

≤ 0.25 dB

1 turn, mandrel radius 5 mm at 1550 nm

≤ 0.15 dB

1 turn, mandrel radius 5 mm at 1625 nm

≤ 0.45 dB

Mechanical Characteristics 

Coating strip force

1.3 ~ 8.9 N

Typical attenuation is the value measured for at least 90% of the fibers in the cable.

OTDR measurement values can only be guaranteed for cable lengths of 1000 m and more.

Cable on the reel may show an discontinuity of the OTDR curve caused by winding of the cable on the reel.