BS EN IEC 60793-1-22:2024
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Optical fibres – Measurement methods and test procedures. Length measurement
| Published By | Publication Date | Number of Pages |
| BSI | 2024 | 46 |
IEC 60793-1-22:2024 establishes uniform requirements for measuring the length and elongation of optical fibre (typically within cable). The length of an optical fibre is a fundamental value for the evaluation of transmission characteristics such as losses and bandwidths.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 5 | Annex ZA (normative)Normative references to international publicationswith their corresponding European publications |
| 6 | English CONTENTS |
| 9 | FOREWORD |
| 11 | INTRODUCTION |
| 12 | 1 Scope 2 Normative references 3 Terms, definitions, and abbreviated terms 3.1 Terms and definitions 3.2 Abbreviated terms |
| 13 | 4 Overview of method 4.1 General 4.2 Method A – Delay measuring 4.3 Method B – Backscattering 4.4 Method C – Fibre elongation 4.5 Method D – Mechanical length Tables Table 1 – Measurement methods |
| 14 | 4.6 Method E – Phase shift 4.7 Reference test method 5 Apparatus 6 Sampling 7 Procedure 8 Calculations 9 Results |
| 15 | 10 Specification information |
| 16 | Annexes Annex A (normative) Requirements specific to method A – Delay measuring A.1 General A.2 Principle A.3 Apparatus A.3.1 Two techniques |
| 17 | A.3.2 Optical source Figures Figure A.1 – Time measurement of the transmitted pulse Figure A.2 – Time measurement of the reflected pulse |
| 18 | A.3.3 Optical detector A.4 Procedure A.4.1 Calibration A.4.2 Average group index value A.4.3 Length measurement |
| 19 | A.5 Calculations A.5.1 General A.5.2 Transmitted-pulse technique Figure A.3 – Principle of fibre-length measurement |
| 20 | A.5.3 Reflected-pulse technique A.6 Results |
| 21 | Annex B (normative) Requirements specific to method B – Backscattering B.1 General B.2 Apparatus B.2.1 General B.2.2 Optical transmitter Figure B.1 – Block diagram of an OTDR |
| 22 | B.2.3 Launch conditions B.2.4 Optical coupler or splitter B.2.5 Optical receiver B.2.6 Pulse duration and repetition rate B.2.7 Signal processor B.2.8 Display B.2.9 Data interface (optional) B.2.10 Reflection controller (optional) |
| 23 | B.2.11 Splices and connectors B.3 Sampling B.4 Procedure B.4.1 Three techniques B.4.2 Procedure common to all three techniques |
| 24 | B.4.3 Procedures specific to each technique |
| 25 | Figure B.2 – Schematic OTDR trace of a sample (z1 to z0) with a section of unknown length, z1, preceding it and without a reflection pulse from the fibre joint point (two-point technique (B.4.3.1)) Figure B.3 – Schematic OTDR trace of sample (z1 to z2) with a section of unknown length, z1, preceding it and with a reflection pulse from the fibre joint point (two-point technique (B.4.3.1)) |
| 26 | B.4.4 Determination of group index Figure B.4 – Schematic trace of a sample (0 to z2) with no section preceding it (single-point technique 0 (B.4.3.2)) Figure B.5 – Schematic OTDR trace of a sample (zD to z2) with a section of known length, zD, preceding it (single-point technique 1 (B.4.3.3)) |
| 27 | B.5 Results |
| 28 | Annex C (normative) Requirements specific to method C – Fibre elongation C.1 Principle C.2 Apparatus C.2.1 General requirements |
| 29 | C.2.2 Optical measurement equipment C.2.3 Instrument resolution Figure C.1 – Equipment set-up for phase-shift technique (C.2.2.2) |
| 30 | C.3 Procedure C.3.1 Calibration C.3.2 Sample measurement Figure C.2 – Equipment set-up for differential pulse-delay technique (C.2.2.3) |
| 31 | C.4 Results |
| 32 | Annex D (normative) Requirements specific to method D – Mechanical length D.1 Principle D.2 Apparatus D.3 Procedure D.3.1 Calibration D.3.2 Operation |
| 33 | Annex E (normative) Requirements specific to method E – Phase shift E.1 General E.2 Apparatus E.2.1 General E.2.2 Light source E.2.3 Modulator |
| 34 | E.2.4 Launch optics E.2.5 Signal detector and signal detection electronics E.2.6 Reference signal |
| 35 | E.2.7 Computation equipment E.3 Sampling E.4 Procedure E.4.1 Selection of starting frequency E.4.2 Selection of maximum frequency E.4.3 Phase measurement performance |
| 36 | E.4.4 Measurement of length of test fibre E.5 Calculation and interpretation of results |
| 37 | E.6 Group index E.6.1 General E.6.2 Cut-back method E.6.3 Substitution method |
| 38 | Figure E.1 – Apparatus for fibre length measurement |
| 39 | Annex F (informative) Brillouin frequency shift test method F.1 General F.2 Principle |
| 40 | F.3 Apparatus F.3.1 General requirements F.3.2 Optical measurement equipment |
| 41 | F.3.3 Instrument resolution Figure F.1 – Equipment setup for BOTDR technique Figure F.2 – Equipment setup for BOTDR technique |
| 42 | F.4 Procedure F.4.1 Calibration F.4.2 Sample measurement |
| 43 | Figure F.3 – Differential strain recorded during a pulling test over a 100 m of cable Figure F.4 – Absolute strain profile recorded during a pulling test over a 100 m of cable |
| 44 | F.5 Results |
| 45 | Bibliography |
