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BS EN IEC 60793-1-41:2024 Optical fibres - Measurement methods and test procedures. Bandwidth, 2024
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- Annex ZA (normative)Normative references to international publicationswith their corresponding European publications [Go to Page]
- English [Go to Page]
- CONTENTS
- FOREWORD
- 1 Scope
- 2 Normative references
- 3 Terms, definitions and abbreviated terms [Go to Page]
- 3.1 Terms and definitions
- 3.2 Abbreviated terms
- 4 Apparatus [Go to Page]
- 4.1 Radiation source [Go to Page]
- 4.1.1 Method A – Time domain (pulse distortion) measurement
- 4.1.2 Method B – Frequency domain measurement
- 4.1.3 Method C – Overfilled launch modal bandwidth calculated from differential mode delay (OMBc)
- 4.1.4 For method A and method B
- Table 1 – Abbreviated terms [Go to Page]
- 4.2 Launch system [Go to Page]
- 4.2.1 Overfilled launch (OFL)
- 4.2.2 Restricted mode launch (RML)
- Figure 1 – Mandrel wrapped mode filter [Go to Page]
- [Go to Page]
- 4.2.3 Differential mode delay (DMD) launch
- 4.3 Detection system
- 4.4 Recording system
- 4.5 Computational equipment
- 4.6 Overall system performance
- 5 Sampling and specimens [Go to Page]
- 5.1 Test sample
- 5.2 Reference sample
- 5.3 End face preparation
- 5.4 Test sample packaging
- 5.5 Test sample positioning
- 6 Procedure [Go to Page]
- 6.1 Method A – Time domain (pulse distortion) measurement [Go to Page]
- 6.1.1 Output pulse measurement
- 6.1.2 Input pulse measurement method A-1: reference sample from test sample
- 6.1.3 Input pulse measurement method A-2: periodic reference sample
- 6.1.4 Input pulse measurement method A-3: direct reference
- 6.2 Method B – Frequency domain measurement [Go to Page]
- 6.2.1 Output frequency response
- 6.2.2 Method B-1: Reference length from test specimen
- 6.2.3 Method B-2: Reference length from similar fibre
- 6.2.4 Method B-3: Reference from direct coupling
- 6.3 Method C – Overfilled launch modal bandwidth calculated from differential mode delay (OMBc)
- Table 2 – DMD weights for calculating overfilled modal bandwidth (OMBc) from DMD data for 850 nm only
- 7 Calculations or interpretation of results [Go to Page]
- 7.1 Bandwidth (−3 dB), f3 dB
- 7.2 Calculations for optional reporting methods
- 8 Length normalization
- 9 Results [Go to Page]
- 9.1 Information to be provided with each measurement
- 9.2 Information available upon request
- 10 Specification information
- Annex A (normative) Intramodal dispersion factor and the normalized intermodal dispersion limit [Go to Page]
- A.1 Intramodal dispersion factor, IDF
- Table A.1 – Highest expected dispersion for commercially available A1 fibres [Go to Page]
- A.2 Normalized intermodal dispersion limit, NIDL
- A.3 Derivation of the IDF
- Annex B (normative) Fibre transfer function, H(f), power spectrum, |H(f)|, and f3 dB [Go to Page]
- B.1 Fibre transfer function [Go to Page]
- B.1.1 Method A – Time domain (pulse distortion) measurement
- B.1.2 Method B – Frequency-domain measurement
- B.2 Power spectrum [Go to Page]
- B.2.1 Method A – Time domain (pulse distortion) measurement
- B.2.2 Method B – Frequency-domain measurement
- B.2.3 Bandwidth (−3 dB), f3 dB
- Annex C (normative)Calculations for other reporting methods [Go to Page]
- C.1 Fibre impulse response, h(t)
- C.2 RMS impulse response, exact method
- C.3 RMS impulse response, difference of squares approximation
- Annex D (normative) Mode scrambler requirements for overfilled launching conditions to multimode fibres [Go to Page]
- D.1 General
- D.2 Apparatus [Go to Page]
- D.2.1 Light source
- D.2.2 Mode scrambler
- D.2.3 Cladding mode strippers
- Figure D.1 – Two examples of optical fibre scramblers [Go to Page]
- D.3 Sampling and specimens
- D.4 Procedure [Go to Page]
- D.4.1 Qualification of mode scrambler
- D.4.2 Alignment of test fibre in mode scrambler output
- D.4.3 Measurement test
- D.5 Calculations or interpretation of results
- D.6 Results [Go to Page]
- D.6.1 Information to be provided with each measurement
- D.6.2 Information available upon request
- Bibliography [Go to Page]
