National Physical Laboratory

OTDR Calibration Fibres

Fibre Reel
Fibre reel

The artefacts consist of a pair of fibres which can be used to calibrate an OTDR. A 2.2 km lead-in fibre, calibrated for optical length, and a 13 km fibre calibrated for attenuation coefficient uniformity and optical length, are usually supplied. Both fibres are fitted FC/PC connectors.

Also available is the NPL Fibre Attenuation Standard, which has proven attenuation stability better than ± 0.03 dB, and is also recommended for calibrating OTDR's.

More information about calibration of OTDR's is available from the NPL Good Practice Guide "Calibration and use of Optical Time Domain Reflectometers (OTDR)".

A copy of typical calibration certificates for length and attenuation uniformity are available to download.


Measurement Range Typical Uncertainties
2.2 km fibre Optical length @ 1310 and 1550 nm ± 0.1 m
13 km fibre

Optical length @ 1310 and 1550 nm
Attenuation coefficient uniformity @ 1310 and 1550 nm

± 0.3 m
± 0.009 dB/km (each end)
± 0.006 dB/km (average of both ends)


Customer Service tel: +44 20 8943 8637

Last Updated: 14 Feb 2011
Created: 23 Jul 2007


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