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BS EN IEC 60793-1-44:2023 - TC Tracked Changes. Optical fibres - Measurement methods and test procedures. Cut-off wavelength, 2023
- 30480458
- A-30437794 [Go to Page]
- undefined
- Annex ZA (normative)Normative references to international publicationswith their corresponding European publications [Go to Page]
- CONTENTS
- FOREWORD
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Background
- 5 Overview of methods
- Figures [Go to Page]
- Figure 1 – Cut-off measurement system block diagram
- 6 Reference test method
- 7 Apparatus [Go to Page]
- 7.1 Light source
- 7.2 Modulation
- 7.3 Launch optics
- 7.4 Support and positioning apparatus
- 7.5 Deployment mandrel [Go to Page]
- 7.5.1 General
- 7.5.2 Cable cut-off wavelength deployment, method A
- 7.5.3 Cable cut-off wavelength deployment, method B
- 7.5.4 Fibre cut-off wavelength deployment, method C
- Figure 2 – Deployment configuration for cable cut-off wavelength λ cc, method A
- Figure 3 – Deployment configuration for cable cut-off wavelength λ cc, method B
- 7.6 Detection optics
- 7.7 Detector assembly and signal detection electronics
- 7.8 Cladding mode stripper
- 8 Sampling specimen [Go to Page]
- 8.1 Specimen length
- 8.2 Specimen end face
- Figure 4 – Standard deployment for fibre cut-off wavelength measurement
- 9 Procedure [Go to Page]
- 9.1 Positioning of specimen in apparatus [Go to Page]
- 9.1.1 General requirements for all methods
- 9.1.2 Deployment requirements for each method
- 9.2 Measurement of output power [Go to Page]
- 9.2.1 Overview
- Figure 5 – Cut-off wavelength using the bend-reference technique [Go to Page]
- 9.2.2 Bend-reference technique
- 9.2.3 Multimode-reference technique
- 10 Calculations [Go to Page]
- 10.1 Bend-reference technique
- Figure 6 – Cut-off wavelength using the multimode-reference technique
- 10.2 Multimode-reference technique
- 11 Mapping functions
- 12 Results [Go to Page]
- Figure 7 – Cable cut-off vs fibre cut-off for a specific fibre (multimode reference)
- 13 Specification information
- Annex A (normative) Requirements specific to method A – Cable cut-off wavelength, λ cc, using uncabled fibre [Go to Page]
- A.1 Specimen length
- A.2 Procedure – Position specimen on deployment mandrel
- Figure A.1 – Alternative cable cut-off deployment
- Annex B (normative) Requirements specific to method B –Cable cut-off wavelength, λ cc, using cabled fibre [Go to Page]
- B.1 Specimen length
- B.2 Procedure – Position specimen on deployment mandrel
- Annex C (normative) Requirements specific to method C – Fibre cut-off wavelength, λ c [Go to Page]
- C.1 Specimen length
- C.2 Procedure – Position specimen on deployment mandrel
- Figure C.1 – Alternative fibre cut-off deployment – Sliding semi-circle
- Figure C.2 – Alternative fibre cut-off deployment – Multi-bend
- Figure C.3 – Alternative fibre cut-off deployment – Large curve
- Annex D (informative) Cut-off curve artifacts [Go to Page]
- D.1 Description of curve artifacts
- D.2 Curve-fitting technique for artifact filtering [Go to Page]
- D.2.1 Overview
- Figure D.1 – Cut-off curve with linear fit error (multimode reference) [Go to Page]
- D.2.2 General
- Figure D.2 – Fibre cut-off curve fitting technique (multimode reference)
- Figure D.3 – Curve fitting regions [Go to Page]
- D.2.3 Step 1: define the upper wavelength region
- D.2.4 Step 2: characterize the spectral transmittance
- D.2.5 Step 3: calculate the deviation of the spectral transmittance from the linear fit
- D.2.6 Step 4: determine the end wavelength of the transition region
- D.2.7 Step 5: determine the start wavelength of the transition region
- D.2.8 Step 6: characterize the transition region with the theoretical model
- D.2.9 Step 7: compute the cut-off wavelength, (c
- D.3 Fibre deployment method for artifact attenuation
- Figure D.4 – Fibre cut-off curve with artifacts (multimode reference)
- Figure D.5 – Fibre cut-off curve with artifacts (bend reference)
- Figure D.6 – Fibre deployment with large diameter bends for mode filtering
- Figure D.7 – Fibre cut-off curve with mode attenuation (multimode reference)
- Bibliography [Go to Page]
