BS EN IEC 60793-1-40:2019 – TC:2020 Edition
$217.84
Tracked Changes. Optical fibres – Attenuation measurement methods
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 83 |
IEC 60793-1-40:2019 is available as /2 which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition. IEC 60793-1-40:2019 establishes uniform requirements for measuring the attenuation of optical fibre, thereby assisting in the inspection of fibres and cables for commercial purposes. Four methods are described for measuring attenuation, one being that for modelling spectral attenuation: – method A: cut-back; – method B: insertion loss; – method C: backscattering; – method D: modelling spectral attenuation. Methods A to C apply to the measurement of attenuation for all categories of the following fibres: – class A multimode fibres; – class B single-mode fibres. Method C, backscattering, also covers the location, losses and characterization of point discontinuities. Method D is applicable only to class B fibres. Information common to all four methods appears in Clauses 1 to 11, and information pertaining to each individual method appears in Annexes A, B, C, and D, respectively. This second edition cancels and replaces the first edition published in 2001. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) Improvement of the description of measurement details for B6 fibre; b) Improvement of the calibration requirements for A4 fibre; c) Introduction of Annex E describing examples of short cable test results on A1 multimode fibres. Keywords: measuring the attenuation of optical fibre
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | compares BS EN IEC 60793-1-40:2019 |
| 2 | TRACKED CHANGES Text example 1 — indicates added text (in green) |
| 45 | undefined |
| 48 | Annex ZA(normative)Normative references to international publicationswith their corresponding European publications |
| 50 | English CONTENTS |
| 53 | FOREWORD |
| 55 | 1 Scope 2 Normative references |
| 56 | 3 Terms and definitions |
| 57 | 4 Calibration requirements 5 Reference test method 6 Apparatus 7 Sampling and specimens 7.1 Specimen length 7.2 Specimen end face 8 Procedure 9 Calculations 9.1 Methods A and B 9.2 Method C 9.3 Method D 10 Results 10.1 Information available with each measurement |
| 58 | 10.2 Information available upon request 10.3 Method-specific additional information 11 Specification information |
| 59 | Annexes Annex A (normative) Requirements specific to method A – Cut-back A.1 General A.2 Apparatus A.2.1 General apparatus for all fibres Figure A.1 – Arrangement of equipment for loss measurement ata specified wavelength |
| 60 | Figures Figure A.2 – Arrangement of equipment used to obtain loss spectrum Figure A.3 – General launch arrangement |
| 61 | A.2.2 Launch apparatus for all single-mode fibres |
| 62 | A.2.3 Launch apparatus for A1 multimode fibres |
| 63 | Figure A.4 – Limited phase space launch optics Tables Table A.1 – Size examples |
| 64 | A.2.4 Launch apparatus for A2 to A4 multimode fibres Figure A.5 – Two examples of optical fibre scramblers Figure A.6 – Lens system Table A.2 – Launch conditions for A2 to A4 fibres |
| 65 | A.2.5 Calibration requirements Figure A.7 – Launch fibre Figure A.8 – Mode scrambler (for A.4 fibre) |
| 66 | A.3 Procedure A.4 Calculations Figure A.9 – A wide-spectrum source (line “b”) could lead to attenuation measurement errors due to sharp variations on spectral attenuation of polymer-core fibres (line “a”) |
| 67 | Annex B (normative) Requirements specific to method B – Insertion loss B.1 General B.2 Apparatus B.2.1 General set-ups B.2.2 Apparatus common to method A (cut-back) B.2.3 Additional apparatus specific to method B (insertion-loss) B.2.4 Calibration requirements B.3 Procedure |
| 68 | B.4 Calculations Figure B.1 – Calibration of insertion loss measurement set Figure B.2 – Measurement of insertion loss |
| 69 | Annex C (normative) Requirements specific to method C – Backscattering C.1 General C.2 Apparatus C.2.1 General Figure C.1 – Block diagram of an OTDR |
| 70 | C.2.2 Optical transmitter C.2.3 Launch conditions C.2.4 Optical splitter C.2.5 Optical receiver C.2.6 Pulse duration and repetition rate C.2.7 Signal processor |
| 71 | C.2.8 Display C.2.9 Data interface (optional) C.2.10 Reflection controller (optional) C.2.11 Splices and connectors C.3 Sampling and specimens C.4 Procedure C.4.1 General |
| 72 | Figure C.2 – Schematic OTDR trace for a “uniform” specimen preceded by a dead-zone fibre Figure C.3 – Schematic OTDR trace for a “uniform” specimen not preceded by a dead-zone fibre |
| 73 | C.4.2 Further steps for measuring attenuation C.4.3 Further steps for measuring point discontinuities |
| 74 | Figure C.4 – Schematic OTDR trace showing apparent loss due to point discontinuities, one reflective and one non-reflective Figure C.5 – Schematic of an expanded OTDR trace showing two point discontinuities, one with apparent gain, and another with no apparent loss or gain |
| 75 | C.4.4 Calibration C.5 Calculations C.6 Results |
| 76 | Annex D (normative) Requirements specific to method D – Spectral attenuation modelling D.1 General D.2 Apparatus D.3 Sampling and specimens D.4 Procedure |
| 77 | D.5 Calculations D.6 Results |
| 79 | Annex E (informative) Examples of short cable test results on A1 multimode fibres Figure E.1 – Example of attenuation coefficient tests on A1a.1 fibre Figure E.2 – Example of attenuation coefficient tests on A1a.3 fibre |
| 80 | Figure E.3 – Example of attenuation coefficient tests on A1b fibre |
| 81 | Bibliography |
