IEC 60793-1-41:2010

FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 Apparatus
5 Sampling and specimens
6 Procedure
7 Calculations or interpretation of results
8 Length normalization
9 Results
10 Specification information
Annex A (normative) - Intramodal dispersion factor and
        the normalized intermodal dispersion limit
Annex B (normative) - Fibre transfer function, H(f),
        power spectrum, ¦H(f)¦, and f[3 dB]
Annex C (normative) - Calculations for other reporting
        methods
Annex D (normative) - Mode scrambler requirements for
        overfilled launching conditions to multimode
        fibres
Bibliography

IEC 60793-1-41:2010 describes three methods for determining and measuring the modal bandwidth of multimode optical fibres (see IEC 60793-2-10, IEC 60793-30 series and IEC 60793-40 series). The baseband frequency response is directly measured in the frequency domain by determining the fibre response to a sinusoidaly modulated light source. The baseband response can also be measured by observing the broadening of a narrow pulse of light. The calculated response is determined using differential mode delay (DMD) data. The three methods are:
- Method A - Time domain (pulse distortion) measurement
- Method B - Frequency-domain measurement
- Method C - Overfilled launch modal bandwidth calculated from differential mode delay (OMBc).
The main change with respect to the previous edition is the addition of a third method for determining modal bandwidth based on DMD data and to improve measurement procedures for A4 fibres. This standard should be read in conjunction with IEC 60793-1-1 and IEC 60793-1-2, which cover generic specifications.