DIN EN IEC 60793-1-44:2024-06

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 document 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. There are three methods of deployment for measuring the cut-off wavelength: - method A: cable cut-off using uncabled fibre 22 m long sample, λ_c[c]; - method B: cable cut-off using cabled fibre 22 m long sample, λ_c[c]; - method C: fibre cut-off using uncabled fibre 2 m long sample, λ_c. All methods require a reference measurement. There are two reference-scan techniques, either or both of which can be used with all methods: - bend-reference technique; - multimode-reference technique using category A1(OM1-OM5) multimode fibre. There are no restrictions on the scope of application of this document. By applying this document, manufacturers and users can increase investment security, and testing laboratories and manufacturers are provided with defined test specifications and ensured compatibility across manufacturers.