This part of IEC 60793 establishes uniform requirements for the mechanical characteristic: fibre curl or latent curvature in uncoated optical fibres, i.e. a specified length of the fibre has been stripped from coating. Fibre curl has been identified as an important parameter for minimizing the splice loss of optical fibres when using passive alignment fusion splicers or active alignment mass fusion splicers.
Two methods are recognized for the measurement of fibre curl, in uncoated optical fibres:
•method A: side view microscopy;
•method B: laser beam scattering.
