Optical fibres – Part 1-44: Measurement methods and test procedures – Cut-off wavelength
|Publication Date:||1 April 2011|
|ICS Code (Fibres and cables):||33.180.10|
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 the methods for measuring the cut-off wavelength of fibre and cable
There are two methods for measuring cable cut-off wavelength, λcc:
• Method A: using uncabled fibre;
• Method B: using cabled fibre.
There is only one method (Method C) for measuring fibre cut-off wavelength, λc.
The test method in this standard describes procedures for determining the cut-off wavelength of a sample fibre in either an uncabled condition (λc) or in a cable (λ cc). Three default configurations are given here: any different configuration will be given in a detail specification. These procedures apply to all category B and C fibre types (see Normative references).
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.