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.<\/p>\n
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| 42<\/td>\n | A-30437794 <\/td>\n<\/tr>\n | ||||||
| 43<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 46<\/td>\n | Annex ZA (normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n | ||||||
| 47<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 49<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 51<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 52<\/td>\n | 4 Background 5 Overview of methods Figures Figure 1 \u2013 Cut-off measurement system block diagram <\/td>\n<\/tr>\n | ||||||
| 53<\/td>\n | 6 Reference test method 7 Apparatus 7.1 Light source 7.2 Modulation 7.3 Launch optics 7.4 Support and positioning apparatus <\/td>\n<\/tr>\n | ||||||
| 54<\/td>\n | 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 \u2013 Deployment configuration for cable cut-off wavelength \u03bb cc, method A Figure 3 \u2013 Deployment configuration for cable cut-off wavelength \u03bb cc, method B <\/td>\n<\/tr>\n | ||||||
| 55<\/td>\n | 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 \u2013 Standard deployment for fibre cut-off wavelength measurement <\/td>\n<\/tr>\n | ||||||
| 56<\/td>\n | 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 \u2013 Cut-off wavelength using the bend-reference technique <\/td>\n<\/tr>\n | ||||||
| 57<\/td>\n | 9.2.2 Bend-reference technique 9.2.3 Multimode-reference technique 10 Calculations 10.1 Bend-reference technique Figure 6 \u2013 Cut-off wavelength using the multimode-reference technique <\/td>\n<\/tr>\n | ||||||
| 58<\/td>\n | 10.2 Multimode-reference technique <\/td>\n<\/tr>\n | ||||||
| 59<\/td>\n | 11 Mapping functions 12 Results Figure 7 \u2013 Cable cut-off vs fibre cut-off for a specific fibre (multimode reference) <\/td>\n<\/tr>\n | ||||||
| 60<\/td>\n | 13 Specification information <\/td>\n<\/tr>\n | ||||||
| 61<\/td>\n | Annex A (normative) Requirements specific to method A \u2013 Cable cut-off wavelength, \u03bb cc, using uncabled fibre A.1 Specimen length A.2 Procedure \u2013 Position specimen on deployment mandrel Figure A.1 \u2013 Alternative cable cut-off deployment <\/td>\n<\/tr>\n | ||||||
| 62<\/td>\n | Annex B (normative) Requirements specific to method B \u2013Cable cut-off wavelength, \u03bb cc, using cabled fibre B.1 Specimen length B.2 Procedure \u2013 Position specimen on deployment mandrel <\/td>\n<\/tr>\n | ||||||
| 63<\/td>\n | Annex C (normative) Requirements specific to method C \u2013 Fibre cut-off wavelength, \u03bb c C.1 Specimen length C.2 Procedure \u2013 Position specimen on deployment mandrel Figure C.1 \u2013 Alternative fibre cut-off deployment \u2013 Sliding semi-circle <\/td>\n<\/tr>\n | ||||||
| 64<\/td>\n | Figure C.2 \u2013 Alternative fibre cut-off deployment \u2013 Multi-bend Figure C.3 \u2013 Alternative fibre cut-off deployment \u2013 Large curve <\/td>\n<\/tr>\n | ||||||
| 65<\/td>\n | 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 \u2013 Cut-off curve with linear fit error (multimode reference) <\/td>\n<\/tr>\n | ||||||
| 66<\/td>\n | D.2.2 General Figure D.2 \u2013 Fibre cut-off curve fitting technique (multimode reference) Figure D.3 \u2013 Curve fitting regions <\/td>\n<\/tr>\n | ||||||
| 67<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 68<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 69<\/td>\n | D.2.9 Step 7: compute the cut-off wavelength, (c <\/td>\n<\/tr>\n | ||||||
| 70<\/td>\n | D.3 Fibre deployment method for artifact attenuation Figure D.4 \u2013 Fibre cut-off curve with artifacts (multimode reference) Figure D.5 \u2013 Fibre cut-off curve with artifacts (bend reference) <\/td>\n<\/tr>\n | ||||||
| 71<\/td>\n | Figure D.6 \u2013 Fibre deployment with large diameter bends for mode filtering Figure D.7 \u2013 Fibre cut-off curve with mode attenuation (multimode reference) <\/td>\n<\/tr>\n | ||||||
| 72<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Tracked Changes. Optical fibres – Measurement methods and test procedures. Cut-off wavelength<\/b><\/p>\n |