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BS EN IEC 60793-1-44:2023 – TC

BS EN IEC 60793-1-44:2023 – TC

$186.33

Tracked Changes. Optical fibres – Measurement methods and test procedures. Cut-off wavelength

Published By Publication Date Number of Pages
BSI 2023 74
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IEC 60793-1-44:2023 establishes uniform requirements for measuring the cut-off wavelength of single-mode optical fibre, thereby assisting in the inspection of fibres and cables for commercial purposes. This document gives methods for measuring the cut-off wavelength for uncabled or cabled single mode telecom fibre. These procedures apply to all category B and C fibre types. There are three methods of deployment for measuring the cut-off wavelength: – method A: cable cut-off using uncabled fibre 22 m long sample, lcc; – method B: cable cut-off using cabled fibre 22 m long sample, lcc; – method C: fibre cut-off using uncabled fibre 2 m long sample, lc. All methods require a reference measurement. There are two reference-scan techniques, either or both of which can be used with all methods: – bend-reference technique; – multimode-reference technique using category A1(OM1-OM5) multimode fibre. This third edition cancels and replaces the second edition published in 2011. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) used the diameter of the fibre loops to describe deployment; b) added Annex D related to cut-off curve artifacts; c) reorganized information and added more figures to clarify concepts.

PDF Catalog

PDF Pages PDF Title
1 30480458
42 A-30437794
43 undefined
46 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
47 CONTENTS
49 FOREWORD
51 1 Scope
2 Normative references
3 Terms and definitions
52 4 Background
5 Overview of methods
Figures
Figure 1 – Cut-off measurement system block diagram
53 6 Reference test method
7 Apparatus
7.1 Light source
7.2 Modulation
7.3 Launch optics
7.4 Support and positioning apparatus
54 7.5 Deployment mandrel
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
55 7.6 Detection optics
7.7 Detector assembly and signal detection electronics
7.8 Cladding mode stripper
8 Sampling specimen
8.1 Specimen length
8.2 Specimen end face
Figure 4 – Standard deployment for fibre cut-off wavelength measurement
56 9 Procedure
9.1 Positioning of specimen in apparatus
9.1.1 General requirements for all methods
9.1.2 Deployment requirements for each method
9.2 Measurement of output power
9.2.1 Overview
Figure 5 – Cut-off wavelength using the bend-reference technique
57 9.2.2 Bend-reference technique
9.2.3 Multimode-reference technique
10 Calculations
10.1 Bend-reference technique
Figure 6 – Cut-off wavelength using the multimode-reference technique
58 10.2 Multimode-reference technique
59 11 Mapping functions
12 Results
Figure 7 – Cable cut-off vs fibre cut-off for a specific fibre (multimode reference)
60 13 Specification information
61 Annex A (normative) Requirements specific to method A – Cable cut-off wavelength, λ cc, using uncabled fibre
A.1 Specimen length
A.2 Procedure – Position specimen on deployment mandrel
Figure A.1 – Alternative cable cut-off deployment
62 Annex B (normative) Requirements specific to method B –Cable cut-off wavelength, λ cc, using cabled fibre
B.1 Specimen length
B.2 Procedure – Position specimen on deployment mandrel
63 Annex C (normative) Requirements specific to method C – Fibre cut-off wavelength, λ c
C.1 Specimen length
C.2 Procedure – Position specimen on deployment mandrel
Figure C.1 – Alternative fibre cut-off deployment – Sliding semi-circle
64 Figure C.2 – Alternative fibre cut-off deployment – Multi-bend
Figure C.3 – Alternative fibre cut-off deployment – Large curve
65 Annex D (informative) Cut-off curve artifacts
D.1 Description of curve artifacts
D.2 Curve-fitting technique for artifact filtering
D.2.1 Overview
Figure D.1 – Cut-off curve with linear fit error (multimode reference)
66 D.2.2 General
Figure D.2 – Fibre cut-off curve fitting technique (multimode reference)
Figure D.3 – Curve fitting regions
67 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
68 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
69 D.2.9 Step 7: compute the cut-off wavelength, (c
70 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)
71 Figure D.6 – Fibre deployment with large diameter bends for mode filtering
Figure D.7 – Fibre cut-off curve with mode attenuation (multimode reference)
72 Bibliography

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BS EN IEC 60793-1-44:2023 - TC
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