OPTOKON

Fiber type

50/125

OPK code

OM4

Optical Characteristics

Attenuation coefficient Loose tube Cables (Typical / Maximum)

at 850 nm

2.2 / 3.5 dB/km

at 1300 nm

0.5 / 1.5 dB/km

Attenuation coefficient Tight Buffered Cables (Typical / Maximum)

at 850 nm

2.5 / 3.5 dB/km

at 1300 nm

0.6 / 1.5 dB/km

Point of discontinuity  at 1300 nm

≤ 0.2 dB

Zero dispersion wavelength

1295 – 1340 nm

Zero dispersion slope  1295 ≤ l0 ≤ 1310 nm

≤ 0.105 ps/(nm2·km)

Zero dispersion slope  1310 ≤ l0 ≤ 1340 nm

≤ 0.000375·(1590-l0 ) ps/(nm2·km)

Numerical Aperture

0.200 ± 0.015

Effective group index of refraction at 850 nm

1.483

Effective group index of refraction at 1300 nm

1.478

Performance Characteristics 

Bandwidth (Overfilled launch)

at 850 nm

≥ 3500 MHz·km

at 1300 nm

≥ 500 MHz·km

Effective Modal Bandwidth (EMB) at 850 nm

≥ 4700 MHz·km

Transmission Link Lengths for 10 Gb/s1

at 850 nm

550 m

at 1300 nm

300 m

Geometrical Characteristics 

Core diameter

50 ± 2.5 µm

Core non-circularity

≤ 5.0 %

Core/Cladding concentricity error

≤ 1 µm

Cladding diameter

125.0 ± 1.0 µm

Cladding non-circularity

≤ 1.0 %

Primary coating diameter (uncoloured fibre)

242 ±7 µm

Primary coating diameter (coloured fibre)

250 ±10 µm

Coating-Cladding concentricity

≤ 10 µm

Macrobending loss

100 turns, mandrel diameter 75 mm at 850 nm

≤ 0.05 dB

100 turns, mandrel diameter 75 mm at 1300 nm

≤ 0.15 dB

2 turns, mandrel diameter 30 mm at 850 nm

≤ 0.1 dB

2 turns, mandrel diameter 30 mm at 1300 nm

≤ 0.3 dB

2 turns, mandrel diameter 15 mm at 850 nm

≤ 0.2 dB

2 turns, mandrel diameter 15 mm at 1300 nm

≤ 0.5 dB

Mechanical Characteristics 

Proof test level

≥ 0.69 Gpa (≥ 8.8 N)

Coating strip force

1.9 N

Dynamic fatigue resistance parameter

≥ 23

1 850 nm operating wavelength with transmitters meeting encircled flux of ≤ 30% @ radius 4.5 μm

and ≥ 86 % @ radius 19.0 μm. At 1300 nm link length using LX4.

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.