Optical fibres - Part 1-40: Attenuation measurement methods

IEC 60793-1-40:2024 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 Clause 1 to Clause 11, and information pertaining to each individual method appears in Annex A, Annex B, Annex C, and Annex D, respectively. This third edition cancels and replaces the second edition published in 2019. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) modifying the definition of attenuation to be compatible with the definition in electropedia.org

Lichtwellenleiter - Teil 1-40: Dämpfungsmessverfahren

Fibres optiques - Partie 1-40: Méthodes de mesure de l'affaiblissement

L'IEC 60793-1-40:2024 établit des exigences harmonisées pour mesurer l'affaiblissement d'une fibre optique, contribuant ainsi au contrôle des fibres et des câbles à des fins commerciales. Quatre méthodes sont décrites pour mesurer l'affaiblissement, parmi lesquelles une méthode pour modéliser l'affaiblissement spectral: -méthode A: fibre coupée; -méthode B: pertes d'insertion; -méthode C: rétrodiffusion; -méthode D: modélisation de l'affaiblissement spectral. Les méthodes A à C s'appliquent au mesurage de l'affaiblissement pour toutes les catégories de fibres suivantes: -fibres multimodales de classe A; -fibres unimodales de classe B. La méthode C, rétrodiffusion, s'applique aussi à la localisation, aux pertes et à la caractérisation des discontinuités ponctuelles. La méthode D s'applique uniquement aux fibres de classe B. Les informations communes à ces quatre méthodes sont présentées aux Articles 1 à 11, et les informations propres à chaque méthode individuelle, sont présentées à l'Annexe A, l'Annexe B, l'Annexe C et l'Annexe D, respectivement. Cette troisième édition annule et remplace la deuxième édition parue en 2019. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) modification de la définition de l'affaiblissement pour s'aligner sur la définition du site electropedia.org

Optična vlakna - 1-40. del: Metode merjenja slabljenja (IEC 60793-1-40:2024)

General Information

Status
Published
Publication Date
16-Jan-2025
Current Stage
6060 - Document made available - Publishing
Start Date
17-Jan-2025
Due Date
17-Jan-2025
Completion Date
17-Jan-2025

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SLOVENSKI STANDARD
01-marec-2025
Optična vlakna - 1-40. del: Metode merjenja slabljenja (IEC 60793-1-40:2024)
Optical fibres - Part 1-40: Attenuation measurement methods (IEC 60793-1-40:2024)
Lichtwellenleiter - Teil 1-40: Dämpfungsmessverfahren (IEC 60793-1-40:2024)
Fibres optiques - Partie 1-40: Méthodes de mesure de l'affaiblissement (IEC 60793-1-
40:2024)
Ta slovenski standard je istoveten z: EN IEC 60793-1-40:2025
ICS:
33.180.10 (Optična) vlakna in kabli Fibres and cables
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60793-1-40

NORME EUROPÉENNE
EUROPÄISCHE NORM January 2025
ICS 33.180.10 Supersedes EN IEC 60793-1-40:2019
English Version
Optical fibres - Part 1-40: Attenuation measurement methods
(IEC 60793-1-40:2024)
Fibres optiques - Partie 1-40: Méthodes de mesure de Lichtwellenleiter - Teil 1-40: Dämpfungsmessverfahren
l'affaiblissement (IEC 60793-1-40:2024)
(IEC 60793-1-40:2024)
This European Standard was approved by CENELEC on 2025-01-01. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60793-1-40:2025 E

European foreword
The text of document 86A/2355/CDV, future edition 3 of IEC 60793-1-40, prepared by SC 86A "Fibres
and cables" of IEC/TC 86 "Fibre optics" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN IEC 60793-1-40:2025.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2026-01-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2028-01-31
document have to be withdrawn
This document supersedes EN IEC 60793-1-40:2019 and all of its amendments and corrigenda (if
any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60793-1-40:2024 was approved by CENELEC as a
European Standard without any modification.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Année Titre EN/HD Année
IEC 60793-1-1 - Optical fibres - Part 1-1: Measurement EN IEC 60793-1-1 -
methods and test procedures - General
and guidance
IEC 60793-1-22 - Optical fibres - Part 1-22: Measurement EN IEC 60793-1-22 -
methods and test procedures - Length
measurement
IEC 60793-1-43 - Optical fibres - Part 1-43: Measurement EN 60793-1-43 -
methods and test procedures - Numerical
aperture measurement
IEC 61746-1 - Calibration of optical time-domain EN 61746-1 -
reflectometers (OTDR) - Part 1: OTDR for
single mode fibres
IEC 61746-2 - Calibration of optical time-domain EN 61746-2 -
reflectometers (OTDR) - Part 2: OTDR for
multimode fibres
IEC 60793-1-40 ®
Edition 3.0 2024-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical fibres –
Part 1-40: Attenuation measurement methods

Fibres optiques –
Partie 1-40: Méthodes de mesure de l'affaiblissement

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.10  ISBN 978-2-8327-0026-6

– 2 – IEC 60793-1-40:2024 © IEC 2024
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviated terms . 8
3.1 Terms and definitions . 8
3.2 Abbreviated terms . 9
4 Calibration requirements . 9
5 Reference test method . 9
6 Apparatus . 9
7 Sample preparation . 9
7.1 Sample length . 9
7.2 Sample end face . 9
8 Procedure . 9
9 Calculations . 9
9.1 Methods A and B . 9
9.2 Method C . 10
9.3 Method D . 10
10 Results . 10
10.1 Information available with each measurement . 10
10.2 Information available upon request . 10
10.3 Method-specific additional information . 10
11 Specification information . 10
Annex A (normative) Requirements specific to method A – Cut-back . 11
A.1 General . 11
A.2 Apparatus . 11
A.2.1 General apparatus for all fibres. 11
A.2.2 Launch apparatus for all single-mode fibres . 13
A.2.3 Launch apparatus for A1 multimode fibres . 14
A.2.4 Launch apparatus for A2 to A4 multimode fibres . 16
A.2.5 Calibration requirements . 17
A.3 Procedure . 18
A.4 Calculations . 18
Annex B (normative) Requirements specific to method B – Insertion loss . 19
B.1 General . 19
B.2 Apparatus . 19
B.2.1 General set-ups . 19
B.2.2 Apparatus common to method A (cut-back). 19
B.2.3 Additional apparatus specific to method B (insertion-loss) . 19
B.2.4 Calibration requirements . 19
B.3 Procedure . 19
B.4 Calculations . 20
Annex C (normative) Requirements specific to method C – Backscattering . 21
C.1 General . 21
C.2 Apparatus . 21
C.2.1 General . 21

IEC 60793-1-40:2024 © IEC 2024 – 3 –
C.2.2 Optical transmitter . 21
C.2.3 Launch conditions . 22
C.2.4 Optical splitter . 22
C.2.5 Optical receiver . 22
C.2.6 Pulse duration and repetition rate . 22
C.2.7 Signal processor . 22
C.2.8 Display . 22
C.2.9 Data interface (optional) . 23
C.2.10 Reflection controller (optional) . 23
C.2.11 Splices and connectors . 23
C.3 Sampling and specimens . 23
C.4 Procedure . 23
C.4.1 General measurement steps . 23
C.4.2 Further steps for measuring attenuation. 24
C.4.3 Further steps for measuring point discontinuities . 25
C.4.4 Calibration . 26
C.5 Calculations . 27
C.6 Results . 27
Annex D (normative) Requirements specific to method D – Spectral attenuation
modelling . 28
D.1 General . 28
D.2 Apparatus .
...

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