IEC 60793-1-49:2006

FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 Apparatus
  4.1 Optical source
  4.2 Stability
  4.3 Launch system
  4.4 Detection system
  4.5 Computational equipment
5 Sampling and specimens
  5.1 Test sample
  5.2 Specimen endfaces
  5.3 Specimen length
  5.4 Specimen packaging
  5.5 Specimen positioning
6 Procedure
  6.1 Adjust and measure system response
  6.2 Adjust detection system
  6.3 Measure the test sample
7 Calculations and interpretation of results
  7.1 Differential mode delay (DMD)
  7.2 Minimum calculated effective modal bandwidth
  7.3 Length normalization
8 Documentation
  8.1 Report the following information for each test:
  8.2 The following information shall be available upon
      request:
9 Specification information
Annex A (normative) Source spectral width limitation
Annex B (informative) Discussion of measurement details
Annex C (informative) Determining DMD weights for EMBc calculation
Annex D (informative) EMBc calculation information
Annex E (informative) Comparison between this standard and
                      ITU recommendations
Bibliography
Figures
Tables

Describes a method for characterizing the modal structure of a graded-index multimode fibre. The information is useful for assessing the bandwidth performance of a fibre when used with laser sources. Applies only to multimode, graded-index glass-core (category A1) fibres. The test method is commonly used in production and research facilities, however is not easily accomplished in the field.