TIA-455-111-A:2003

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FOTP-111 IEC-60793-1-34 Optical Fibers – Part 1-34: Measurement Methods and Test Procedures – Fibre Curl

Published By	Publication Date	Number of Pages
TIA	2003	20

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Description

This part of IEC 60793 establishes uniform requirements for the
mechanical characteristic fibre curl or latent curvature, in
uncoated optical fibres. 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, presented in Annexes A and B respectively, are
recognized for the measurement of fibre curl, in uncoated optical
fibres:

method A: side view microscopy;
method B: laser beam scattering.

The side view microscopy procedure measures the radius of
curvature of an uncoated fibre by determining the amount of
deflection that occurs as an unsupported fibre end is rotated about
the fibre's axis.

The laser beam scattering procedure measures fibre curl in an
optical fibre by laser beam scattering. By knowing the maximum
deflection of the fibre and the overhang distance from the fibre
fixture to the measurement point, the fibre's radius of curvature
can be calculated from a simple circular model, the derivation of
which is given in annex C.

Both methods are applicable to types A1, A2, A3 and B optical
fibres.

Method A is the reference test method, used to resolve
disputes.

Additional information