Multi-step index reference fibre

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NPL can supply a length of specially designed optical fibre with a multi-step refractive index profile. This fibre can be used to calibrate the refractive index difference scale of a customer’s refracted near field profiling equipment. The intermediate steps can also be used to assess non-linearity.

The refractive index profile is shown below.

Profile of the NPL multi-index fibre

Typical measurement uncertainties:

Refractive index difference: 1.5% (or 0.000 1 if greater)

An example Calibration Certificate is available to download

Contact the Instrumentation team for more information

Fibre Optics Calibration Artefacts

Fibre Optics

NPL produces a range of traceable optical fibre transfer standard artefacts for use on customer test equipment. These artefacts are constructed and calibrated at NPL and with a few exceptions are UKAS accredited. In most cases they also conform to current standards (such as IEC, ITU and BIS).