EN 60793-1-40:2003

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Definitions
4 Calibration requirements
5 Reference test method
6 Apparatus
7 Sampling and specimens
   7.1 Specimen length
   7.2 Specimen end face
8 Procedure
9 Calculations
   9.1 Methods A and B
   9.2 Method C
   9.3 Method D
10 Results
   10.1 Information available with each measurement
   10.2 Information available upon request
11 Specification information
Annex A (normative) Requirements specific to method A - Cut-back
Annex B (normative) Requirements specific to method B - Insertion
        loss
Annex C (normative) Requirements specific to method C - Backscattering
Annex D (normative) Requirements specific to method D - Spectral
        attenuation modelling

Establishes uniform requirements for measuring the attenuation of optical fibres. Four methods are described: (a) cut-back, (b) insertion loss, (d) backscattering, (d) modelling spectral attenuation. Methods (a), (b) and (c) apply to all categories of class A multimode fibres and class B single-mode fibres. Method (c), backscattering, also covers the location, losses and characterization of point discontinuities. Method (d) has been demonstrated only on class B fibres.