UNE-EN IEC 60793-1-44:2024

This part of IEC 60793 establishes uniform requirements for measuring the cut-off wavelength

of single-mode optical fibre, thereby assisting in the inspection of fibres and cables for

commercial purposes.

This standard gives methods for measuring the cut-off wavelength for uncabled or cabled single

mode telecom fibre. These procedures apply to all category B and C fibre types (see Normative

references).

There are three methods of deployment for measuring the cut-off wavelength.

" Method A: Cable cut-off using uncabled fibre 22 m long sample, »cc

" Method B: Cable cut-off using cabled fibre 22 m long sample, »cc

" Method C: Fibre cut-off using uncabled fibre 2 m long sample, »c

All methods require a reference measurement. There are two reference-scan techniques, either

or both of which may be used with all methods:

" bend-reference technique.

" multimode-reference technique using category A1 multimode fibre.