OTDR Distance Scale Artefact
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The distance scale of an OTDR can also be calibrated through the use of a traceable NPL artefact. The artefact incorporates a recirculating optical delay line that generates a number of calibration features along distance scale of an OTDR. Both single-mode and multimode versions of the distance scale artefact are available.
A typical OTDR trace can be seen below. A 2 km lead-in fibre together with a 12 km loop will provide features every 6 km out to about 40 km. Other combinations of lead-in and loop fibre lengths can be supplied on request. A multimode version of the distance scale artefact is also available.
Specification
| Fibre Type | Lead-in Fibre Length | Calibration Uncertainty | Recirculating Loop Fibre Length | Calibration Uncertainty | Measurement Wavelength |
| Single-mode | ~2 200 m | ± 0.1 m | ~13 000 m | ± 0.3 m | 1310 and 1550 nm |
| Multimode |
~1 000 m |
± 0.3 m |
~4 400 m |
± 0.5 m |
850 and 1300 nm |
The device is packaged into one box, fitted with an FC/PC terminated patch lead for direct connection to the OTDR.
A copy of a typical Calibration Certificate is available to download.