BS EN 60793-1-45:2003

INTRODUCTION
1 Scope
2 Normative references
3 Reference test method
4 Apparatus
  4.1 Light source
  4.2 Input optics
  4.3 Input positioner
  4.4 Cladding mode stripper
  4.5 High-order mode filter
  4.6 Output positioner
  4.7 Output optics
  4.8 Detector
  4.9 Computer
5 Sampling and specimens
  5.1 Specimen length
  5.2 Specimen end face
6 Procedure
7 Calculations
  7.1 Method A - Direct far-field scan
  7.2 Method B - Variable aperture in the far field
  7.3 Method C - Near-field scan
8 Results
  8.1 Information to be provided with each measurement
  8.2 Information available upon request
9 Specification information
Annex A (normative) Requirements specific to method A -
        Mode field diameter by direct far-field scan
Annex B (normative) Requirements specific to method B -
        Mode field diameter by variable aperture in the
        far field
Annex C (normative) Requirements specific to method C -
        Mode field diameter by near-field scan
Annex D (normative) Requirements specific to method D -
        Mode field diameter by optical time domain
        reflectometer (OTDR)
Annex E (informative) Sample data sets and calculated values
Annex ZA (normative) Normative references to international
         publications with their corresponding European
         publications

Covers uniform requirements for measuring the mode field diameter (MFD) of optical fibre, thereby assisting in the inspection of fibres and cables for commercial purposes.

Establishes requirements for measuring the mode field diameter (MFD) of fibres. Four methods are described: (a) direct far-field scan: (b) variable aperture in the far field: (c) near-field scan: (d) bi-directional backscatter using an optical time domain reflectometer. All four methods apply to type B single-mode fibres, operating near 1310 nm or 1550 nm. The contents of the corrigendum of July 2002 have been included in this copy.