BS EN 60793-1-41:2010
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Optical fibres – Measurement methods and test procedures. Bandwidth
| Published By | Publication Date | Number of Pages |
| BSI | 2010 | 32 |
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.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 6 | English CONTENTS |
| 8 | 1 Scope 2 Normative references |
| 9 | 3 Terms and definitions 4 Apparatus 4.1 Radiation source |
| 10 | 4.2 Launch system |
| 12 | 4.3 Detection system 4.4 Recording system Figure 1 – Mandrel wrapped mode filter |
| 13 | 4.5 Computational equipment 4.6 Overall system performance 5 Sampling and specimens 5.1 Test sample 5.2 Reference sample 5.3 End face preparation |
| 14 | 5.4 Test sample packaging 5.5 Test sample positioning 6 Procedure 6.1 Method A – Time domain (pulse distortion) measurement |
| 15 | 6.2 Method B – Frequency domain measurement 6.3 Method C – Overfilled launch modal bandwidth calculated from differential mode delay (OMBc) |
| 16 | 7 Calculations or interpretation of results 7.1 -3 dB frequency, f3 dB Table 1 – DMD weights for calculating overfilled modal bandwidth (OMBc) from DMD data for 850 nm only |
| 17 | 7.2 Calculations for optional reporting methods 8 Length normalization 9 Results 9.1 Information to be provided with each measurement 9.2 Information available upon request |
| 18 | 10 Specification information |
| 19 | Annex A (normative) Intramodal dispersion factor and the normalized intermodal dispersion limit Table A.1 – Highest expected dispersion for commercially available A1 fibres |
| 22 | Annex B (normative) Fibre transfer function, H(f), power spectrum, |H(f)|, and f3 dB |
| 24 | Annex C (normative) Calculations for other reporting methods |
| 25 | Annex D (normative) Mode scrambler requirements for overfilled launching conditions to multimode fibres |
| 26 | Figure D.1 – Two examples of optical fibre scramblers |
| 30 | Bibliography |
