IEC 60793-1-40:2019

Optical fibres - Part 1-40: Attenuation measurement methods

IEC 60793-1-40:2019

Name:IEC 60793-1-40:2019   Standard name:Optical fibres - Part 1-40: Attenuation measurement methods
Standard number:IEC 60793-1-40:2019   language:English language
Release Date:26-Mar-2019   technical committee:SC 86A - Fibres and cables
Drafting committee:WG 1 - TC 86/SC 86A/WG 1   ICS number:01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION

IEC 60793-1-40
Edition 2.0 2019-03
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Optical fibres –
Part 1-40: Measurement methods and test procedures – Attenuation
measurement methods




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IEC 60793-1-40
Edition 2.0 2019-03
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Optical fibres –
Part 1-40: Measurement methods and test procedures – Attenuation

measurement methods
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.10 ISBN 978-2-8322-6770-7

– 2 – IEC 60793-1-40:2019 RLV © IEC 2019
CONTENTS
FOREWORD . 5
INTRODUCTION .
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Calibration requirements . 10
5 Reference test method . 10
6 Apparatus . 10
7 Sampling and specimens . 10
7.1 Specimen length . 10
7.2 Specimen end face . 10
8 Procedure . 10
9 Calculations . 10
9.1 Methods A and B . 10
9.2 Method C . 11
9.3 Method D . 11
10 Results . 11
10.1 Information available with each measurement . 11
10.2 Information available upon request . 11
10.3 Method-specific additional information . 11
11 Specification information . 11
Annex A (normative) Requirements specific to method A – Cut-back . 12
A.1 General . 12
A.2 Apparatus . 12
A.2.1 General apparatus for all fibres. 12
A.2.2 Launch apparatus for all single-mode fibres . 14
A.2.3 Launch apparatus for A1 graded-index multimode fibres . 15
A.2.4 Launch apparatus for A2 to A4 step-index multimode fibres . 17
A.2.5 Calibration requirements . 18
A.3 Procedure . 19
A.4 Calculations . 19
Annex B (normative) Requirements specific to method B – Insertion loss . 20
B.1 General . 20
B.2 Apparatus . 20
B.2.1 General set-ups . 20
B.2.2 Apparatus common to method A (cut-back). 20
B.2.3 Additional apparatus specific to method B (insertion-loss) . 20
B.2.4 Calibration requirements . 20
B.3 Procedure . 20
B.4 Calculations . 21
Annex C (normative) Requirements specific to method C – Backscattering . 22
C.1 General . 22
C.2 Apparatus . 22
C.2.1 General . 22

C.2.2 Optical transmitter . 23
C.2.3 Launch conditions . 23
C.2.4 Optical splitter . 23
C.2.5 Optical receiver . 23
C.2.6 Pulse duration and repetition rate . 23
C.2.7 Signal processor . 23
C.2.8 Display . 24
C.2.9 Data interface (optional) . 24
C.2.10 Reflection controller (optional) . 24
C.2.11 Splices and connectors . 24
C.3 Sampling and specimens . 24
C.4 Procedure . 24
C.4.1 General . 24
C.4.2 Further steps for measuring attenuation. 26
C.4.3 Further steps for measuring point discontinuities . 26
C.4.4 Calibration . 28
C.5 Calculations . 28
C.6 Results . 28
Annex D (normative) Requirements specific to method D – Spectral attenuation
modelling . 30
D.1 General . 30
D.2 Apparatus . 30
D.3 Sampling and specimens . 30
D.4 Procedure . 30
D.5 Calculations . 31
D.6 Results . 31
Annex E (informative) Examples of short cable test results on A1 multimode fibres . 33
Bibliography . 35

Figure A.1 – Arrangement of equipment to make for loss measurement at one
a specified wavelength . 12
Figure A.2 – Arrangement of equipment used to obtain loss spectrum . 13
Figure A.3 – General launch arrangement . 13
Figure A.4 – Limited phase space launch optics . 16
Figure A.5 – Two examples of optical fibre scramblers . 17
Figure A.6 – Lens system . 17
Figure A.7 – Launch fibre . 18
Figure A.8 – Mode scrambler (for A.4 fibre) . 18
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") . 19
Figure B.1 – Calibration of insertion loss measurement set . 21
Figure B.2 – Measurement of insertion loss . 21
Figure C.1 – Block diagram of an OTDR . 22
Figure C.2 – Schematic OTDR trace for a "uniform" specimen preceded by a
dead-zone fibre . 25
Figure C.3 – Schematic OTDR trace for a "uniform" specimen not preceded by a dead-
zone fibre . 25

– 4 – IEC 60793-1-40:2019 RLV © IEC 2019
Figure C.4 – Schematic OTDR trace showing apparent loss due to point discontinuities,
one reflective and one non-reflective . 27
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 . 27
Figure E.1 – Example of attenuation coefficient tests on A1a.1 fibre .
...

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