IEC 60793-2-60:2025

IEC 60793-2-60 ®
Edition 2.0 2025-09
INTERNATIONAL
STANDARD
Optical fibres -
Part 2-60: Product specifications - Sectional specification for class C single-
mode interconnection fibres
ICS 33.180.10  ISBN 978-2-8327-0707-4

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or
by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either
IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC copyright
or have an enquiry about obtaining additional rights to this publication, please contact the address below or your local
IEC member National Committee for further information.

IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - IEC Products & Services Portal - products.iec.ch
webstore.iec.ch/advsearchform Discover our powerful search engine and read freely all the
The advanced search enables to find IEC publications by a publications previews, graphical symbols and the glossary.
variety of criteria (reference number, text, technical With a subscription you will always have access to up to date
committee, …). It also gives information on projects, content tailored to your needs.
replaced and withdrawn publications.
Electropedia - www.electropedia.org
The world's leading online dictionary on electrotechnology,
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published containing more than 22 500 terminological entries in English
details all new publications released. Available online and and French, with equivalent terms in 25 additional languages.
once a month by email. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer
Service Centre: sales@iec.ch.
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms, definitions, symbols, and abbreviated terms . 6
3.1 Terms and definitions. 6
3.2 Symbols and abbreviated terms . 6
4 Specifications . 6
4.1 General . 6
4.2 Dimensional requirements . 7
4.3 Mechanical requirements . 8
4.4 Transmission requirements . 8
4.5 Environmental requirements . 9
4.5.1 General . 9
4.5.2 Transmission requirements . 10
4.5.3 Mechanical requirements . 10
Annex A (normative) Family specification for C1 single-mode fibres. 12
A.1 General . 12
A.2 Dimensional requirements . 12
A.3 Mechanical requirements . 12
A.4 Transmission requirements . 13
A.5 Environmental requirements . 13
A.5.1 General . 13
A.5.2 Transmission requirements . 13
A.5.3 Mechanical requirements – Coating strip force . 14
Annex B (normative) Family specification for C2 single-mode fibres. 15
B.1 General . 15
B.2 Dimensional requirements . 15
B.3 Mechanical requirements . 15
B.4 Transmission requirements . 15
B.5 Environmental requirements . 16
B.5.1 General . 16
B.5.2 Transmission requirements . 16
B.5.3 Mechanical requirements – Coating strip force . 16
Annex C (normative) Family specification for C3 single-mode fibres . 17
C.1 General . 17
C.2 Dimensional requirements . 17
C.3 Mechanical requirements . 17
C.4 Transmission requirements . 18
C.5 Environmental requirements . 18
C.5.1 General . 18
C.5.2 Transmission requirements . 18
C.5.3 Mechanical requirements – Coating strip force . 18
Annex D (normative) Family specification for C4 single-mode fibres . 19
D.1 General . 19
D.2 Dimensional requirements . 19
D.3 Mechanical requirements . 19
D.4 Transmission requirements . 20
D.5 Environmental requirements . 20
D.5.1 General . 20
D.5.2 Transmission requirements . 20
D.5.3 Mechanical requirements – Coating strip force . 20
Bibliography . 21

Table 1 – List of families and main differences . 7
Table 2 – Dimensional attributes and measurement methods . 7
Table 3 – Requirements common to class C fibres . 8
Table 4 – Mechanical attributes and measurement methods . 8
Table 5 – Mechanical requirements common to class C fibres . 8
Table 6 – Transmission attributes and measurement methods . 9
Table 7 – Transmission requirements common to class C fibres . 9
Table 8 – Transmission attributes required in family specifications . 9
Table 9 – Environmental attributes and test methods . 9
Table 10 – Environment-dependent mechanical or transmission attributes and test
methods . 10
Table 11 – Tensile strength requirements common to class C fibres . 10
Table 12 – Stress corrosion susceptibility requirements common to class C fibres . 11
Table A.1 – Dimensional requirements for C1 fibres. 12
Table A.2 – Mechanical requirements for C1 fibres . 12
Table A.3 – Transmission requirements for C1 fibres . 13
Table A.4 – Environment-dependent transmission requirements for C1 fibres . 13
Table A.5 – Environment-dependent mechanical requirements for C1 fibres . 14
Table B.1 – Dimensional requirements for C2 fibres. 15
Table B.2 – Mechanical requirements for C2 fibres . 15
Table B.3 – Transmission requirements for C2 fibres . 16
Table B.4 – Environment-dependent transmission requirements for C2 fibres . 16
Table B.5 – Environment-dependent mechanical requirements for C2 fibres . 16
Table C.1 – Dimensional requirements for C3 fibres . 17
Table C.2 – Mechanical requirements for C3 fibres . 17
Table C.3 – Transmission requirements for C3 fibres . 18
Table C.4 – Environment-dependent transmission requirements for C3 fibres . 18
Table C.5 – Environment-dependent mechanical requirements for C3 fibres . 18
Table D.1 – Dimensional requirements for C4 fibres . 19
Table D.2 – Mechanical requirements for C4 fibres . 19
Table D.3 – Transmission requirements for C4 fibres . 20
Table D.4 – Environment-dependent transmission requirements for C4 fibres . 20

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Optical fibres -
Part 2-60: Product specifications - Sectional specification
for class C single-mode interconnection fibres

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 60793-2-60 has been prepared by subcommittee 86A: Fibres and cables, of IEC technical
committee 86: Fibre optics. It is an International Standard.
This second edition cancels and replaces the first edition published in 2008. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) replacement of "intraconnection" with "interconnection" and addition of the definition of
"interconnection fibres";
b) modification of the nominal MFD limit of C1 fibres;
c) addition of "Primary coating diameter-coloured" limits for class C fibres and change of
"Primary coating diameter-uncoloured" limits for class C_80 fibres;
d) change of coating strip force limits for class C1, class C2, and class C3 fibres;
e) replacement of "Fibre cut-off wavelength" with "Cable cut-off wavelength" and revision of
"Note b" in Table 6;
f) replacement of "Fibre cut-off wavelength" with "Cable cut-off wavelength" and deletion of
the "Note" in Table 8;
g) addition of 200 μm coating diameter requirements for C1_125 fibres and change of coating
diameters limits for C1_80 fibres in Table A.1;
h) addition of 200 µm coating diameter requirements for C1_125 fibres and change of coating
strip force limits in Table A.2 and in Table A.5;
i) replacement of "Fibre cut-off wavelength" with "Cable cut-off wavelength", modification of
the "Cable cut-off wavelength" limit and addition of a new "Note" in Table A.3;
j) addition of a transmission requirements at 1 625 nm and deletion of 1 310 nm for C1 fibres
in Table A.4;
k) modification of "Fibre cut-off wavelength" limits of C3 fibres in Table C.3;
l) replacement of "Fibre cut-off wavelength" with "Cable cut-off wavelength" for C4 fibres in
Table D.3.
The text of this International Standard is based on the following documents:
Draft Report on voting
86A/2599/FDIS 86A/2617/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 60793 series, published under the general title Optical fibres can
be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
1 Scope
This part of IEC 60793 is applicable to optical fibre types C1, C2, C3, and C4, as described in
Table 1. These fibres are used for the interconnections within or between optical components
systems and are optimized to support dense optical connectivity. While the fibres can be
overcoated or buffered for the purpose of making protected pigtails, they can be used without
overcoating. They can, however, be colour coded.
2 Normative references
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.
IEC 60793-1-20, Optical fibres - Part 1-20: Measurement methods and test procedures - Fibre
geometry
IEC 60793-1-21, Optical fibres - Part 1-21: Measurement methods and test procedures -
Coating geometry
IEC 60793-1-22, Optical fibres - Part 1-22: Measurement methods and test procedures - Length
measurement
IEC 60793-1-30, Optical fibres - Part 1-30: Measurement methods and test procedures - Fibre
proof test
IEC 60793-1-31, Optical fibres - Part 1-31: Measurement methods and test procedures - Tensile
strength
IEC 60793-1-32, Optical fibres - Part 1-32: Measurement methods and test procedures -
Coating strippability
IEC 60793-1-33, Optical fibres - Part 1-33: Measurement methods and test procedures - Stress
corrosion susceptibility
IEC 60793-1-40, Optical fibres - Part 1-40: Attenuation measurement methods
IEC 60793-1-44, Optical fibres - Part 1-44: Measurement methods and test procedures - Cut-
off wavelength
IEC 60793-1-45, Optical fibres - Part 1-45: Measurement methods and test procedures - Mode
field diameter
IEC 60793-1-46, Optical fibres - Part 1-46: Measurement methods and test procedures –

Monitoring of changes in attenuation
IEC 60793-1-47, Optical fibres - Part 1-47: Measurement methods and test procedures -
Macrobending loss
IEC 60793-1-50, Optical fibres - Part 1-50: Measurement methods and test procedures - Damp
heat (steady state) tests
IEC 60793-1-51, Optical fibres - Part 1-51: Measurement methods and test procedures - Dry
heat (steady state) tests
IEC 60793-1-52, Optical fibres - Part 1-52: Measurement methods and test procedures -
Change of temperature tests
IEC 60793-2, Optical fibres - Part 2: Product specifications - General
3 Terms, definitions, symbols, and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60793-2 and the
following apply. Moreover, the definitions of the specified attributes are contained in the test
methods.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1.1
interconnection fibre
fibre up to 1 km long that is used within or between optical components or systems to support
dense connectivity
3.2 Symbols and abbreviated terms
The following symbols and abbreviated terms are used in this document:
F average strip force
avg
F peak strip force
peak
MFD mode field diameter
n stress corrosion parameter – dynamic
d
4 Specifications
4.1 General
The general requirements defined in IEC 60793-2 apply to these fibres. Specific requirements
that are common to these fibres are found in the body of this text. Particular requirements for
individual fibre types or applications are defined in Annex A, Annex B, Annex C and Annex D,
which refer to normative family specifications. These family specifications are distinguished
based on optimum transmission wavelengths and nominal mode field diameter (MFD), which
affects splice loss.
For each family specification, there are two sub-categories that are distinguished on the basis
of the cladding diameter and other related attributes. The conventional nominal cladding
diameter of 125 μm is augmented by the reduced cladding type product with a nominal diameter
of 80 μm. These are distinguished with suffixes "_125" or "_80". For example, the C1 fibre can
be selected as "C1_125" or "C1_80". The transmission characteristics of both the cladding
diameter choices should be the same.
For each family specificatio
...

IEC 60793-2-60 ®
Edition 2.0 2025-09
NORME
INTERNATIONALE
Fibres optiques -
Partie 2-60: Spécifications de produits - Spécification intermédiaire pour les
fibres d’interconnexion unimodales de classe C
ICS 33.180.10  ISBN 978-2-8327-0707-4

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni
utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et
les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Recherche de publications IEC -  IEC Products & Services Portal - products.iec.ch
webstore.iec.ch/advsearchform Découvrez notre puissant moteur de recherche et consultez
La recherche avancée permet de trouver des publications gratuitement tous les aperçus des publications, symboles
IEC en utilisant différents critères (numéro de référence, graphiques et le glossaire. Avec un abonnement, vous aurez
texte, comité d’études, …). Elle donne aussi des toujours accès à un contenu à jour adapté à vos besoins.
informations sur les projets et les publications remplacées
ou retirées. Electropedia - www.electropedia.org
Le premier dictionnaire d'électrotechnologie en ligne au
IEC Just Published - webstore.iec.ch/justpublished monde, avec plus de 22 500 articles terminologiques en
Restez informé sur les nouvelles publications IEC. Just anglais et en français, ainsi que les termes équivalents
dans 25 langues additionnelles. Egalement appelé
Published détaille les nouvelles publications parues.
Disponible en ligne et une fois par mois par email. Vocabulaire Electrotechnique International (IEV) en ligne.

Service Clients - webstore.iec.ch/csc
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-
nous: sales@iec.ch.
SOMMAIRE
AVANT-PROPOS . 4
1 Domaine d’application . 6
2 Références normatives . 6
3 Termes, définitions, symboles et abréviations . 7
3.1 Termes et définitions . 7
3.2 Symboles et abréviations . 7
4 Spécifications . 7
4.1 Généralités . 7
4.2 Exigences dimensionnelles . 8
4.3 Exigences mécaniques . 9
4.4 Exigences de transmission . 10
4.5 Exigences d’environnement . 10
4.5.1 Généralités . 10
4.5.2 Exigences de transmission . 11
4.5.3 Exigences mécaniques . 11
Annexe A (normative) Spécification de famille pour les fibres unimodales de type C1 . 13
A.1 Généralités . 13
A.2 Exigences dimensionnelles . 13
A.3 Exigences mécaniques . 13
A.4 Exigences de transmission . 14
A.5 Exigences d’environnement . 14
A.5.1 Généralités . 14
A.5.2 Exigences de transmission . 14
A.5.3 Exigences mécaniques – Force de dénudage . 15
Annexe B (normative) Spécification de famille pour les fibres unimodales de type C2 . 16
B.1 Généralités . 16
B.2 Exigences dimensionnelles . 16
B.3 Exigences mécaniques . 16
B.4 Exigences de transmission . 17
B.5 Exigences d’environnement . 17
B.5.1 Généralités . 17
B.5.2 Exigences de transmission . 17
B.5.3 Exigences mécaniques – Force de dénudage . 17
Annexe C (normative) Spécification de famille pour les fibres unimodales de type C3 . 18
C.1 Généralités . 18
C.2 Exigences dimensionnelles . 18
C.3 Exigences mécaniques . 18
C.4 Exigences de transmission . 19
C.5 Exigences d’environnement . 19
C.5.1 Généralités . 19
C.5.2 Exigences de transmission . 19
C.5.3 Exigences mécaniques – Force de dénudage . 20
Annexe D (normative) Spécification de famille pour les fibres unimodales de type C4 . 21
D.1 Généralités . 21
D.2 Exigences dimensionnelles . 21
D.3 Exigences mécaniques . 22
D.4 Exigences de transmission . 22
D.5 Exigences d’environnement . 22
D.5.1 Généralités . 22
D.5.2 Exigences de transmission . 23
D.5.3 Exigences mécaniques – Force de dénudage . 23
Bibliographie . 24

Tableau 1 – Liste des familles et principales différences . 8
Tableau 2 – Attributs dimensionnels et méthodes de mesure . 8
Tableau 3 – Exigences communes aux fibres de classe C . 9
Tableau 4 – Attributs mécaniques et méthodes de mesure . 9
Tableau 5 – Exigences mécaniques communes aux fibres de classe C . 9
Tableau 6 – Attributs de transmission et méthodes de mesure . 10
Tableau 7 – Exigences de transmission communes aux fibres de classe C . 10
Tableau 8 – Attributs de transmission exigés dans les spécifications de famille . 10
Tableau 9 – Attributs d’environnement et méthodes d’essai . 11
Tableau 10 – Attributs mécaniques ou de transmission dépendant de l’environnement
et méthodes d’essai . 11
Tableau 11 – Exigences relatives à la résistance à la traction communes aux fibres de
classe C. 11
Tableau 12 – – Exigences de résistance à la corrosion sous contrainte communes aux
fibres de classe C . 12
Tableau A.1 – Exigences dimensionnelles pour les fibres de type C1 . 13
Tableau A.2 – Exigences mécaniques pour les fibres de type C1 . 14
Tableau A.3 – Exigences de transmission pour les fibres de type C1 . 14
Tableau A.4 – Exigences de transmission dépendant de l’environnement pour les
fibres de type C1 . 15
Tableau A.5 – Exigences mécaniques dépendant de l’environnement pour les fibres de
type C1 . 15
Tableau B.1 – Exigences dimensionnelles pour les fibres de type C2 . 16
Tableau B.2 – Exigences mécaniques pour les fibres de type C2 . 16
Tableau B.3 – Exigences de transmission pour les fibres de type C2 . 17
Tableau B.4 – Exigences de transmission dépendant de l’environnement pour les
fibres de type C2 . 17
Tableau B.5 – Exigences mécaniques dépendant de l’environnement pour les fibres de
type C2 . 17
Tableau C.1 – Exigences dimensionnelles pour les fibres de type C3 . 18
Tableau C.2 – Exigences mécaniques pour les fibres de type C3 . 18
Tableau C.3 – Exigences de transmission pour les fibres de type C3 . 19
Tableau C.4 – Exigences de transmission dépendant de l’environnement pour les
fibres de type C3 . 19
Tableau C.5 – Exigences mécaniques dépendant de l’environnement pour les fibres de
type C3 . 20
Tableau D.1 – Exigences dimensionnelles pour les fibres de type C4 . 21
Tableau D.2 – Exigences mécaniques pour les fibres de type C4 . 22
Tableau D.3 – Exigences de transmission pour les fibres de type C4 . 22
Tableau D.4 – Exigences de transmission dépendant de l’environnement pour les
fibres de type C4 . 23

COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
Fibres optiques -
Partie 2-60: Spécifications de produits - Spécification intermédiaire
pour les fibres d’interconnexion unimodales de classe C

AVANT-PROPOS
1) La Commission Électrotechnique Internationale (IEC) est une organisation mondiale de normalisation composée
de l’ensemble des comités électrotechniques nationaux (Comités nationaux de l’IEC). L’IEC a pour objet de
favoriser la coopération internationale pour toutes les questions de normalisation dans les domaines de
l’électricité et de l’électronique. À cet effet, l’IEC – entre autres activités – publie des Normes internationales,
des Spécifications techniques, des Rapports techniques, des Spécifications accessibles au public (PAS) et des
Guides (ci-après dénommés "Publication(s) de l’IEC"). Leur élaboration est confiée à des comités d’études, aux
travaux desquels tout Comité national intéressé par le sujet traité peut participer. Les organisations
internationales, gouvernementales et non gouvernementales, en liaison avec l’IEC, participent également aux
travaux. L’IEC collabore étroitement avec l’Organisation Internationale de Normalisation (ISO), selon des
conditions fixées par accord entre les deux organisations.
2) Les décisions ou accords officiels de l’IEC concernant les questions techniques représentent, dans la mesure du
possible, un accord international sur les sujets étudiés, étant donné que les Comités nationaux de l’IEC intéressés
sont représentés dans chaque comité d’études.
3) Les Publications de l’IEC se présentent sous la forme de recommandations internationales et sont agréées
comme telles par les Comités nationaux de l’IEC. Tous les efforts raisonnables sont entrepris afin que l’IEC
s’assure de l’exactitude du contenu technique de ses publications; l’IEC ne peut pas être tenue responsable de
l’éventuelle mauvaise utilisation ou interprétation qui en est faite par un quelconque utilisateur final.
4) Dans le but d’encourager l’uniformité internationale, les Comités nationaux de l’IEC s’engagent, dans toute la
mesure possible, à appliquer de façon transparente les Publications de l’IEC dans leurs publications nationales
et régionales. Toutes divergences entre toutes Publications de l’IEC et toutes publications nationales ou
régionales correspondantes doivent être indiquées en termes clairs dans ces dernières.
5) L’IEC elle-même ne fournit aucune attestation de conformité. Des organismes de certification indépendants
fournissent des services d’évaluation de conformité et, dans certains secteurs, accèdent aux marques de
conformité de l’IEC. L’IEC n’est responsable d’aucun des services effectués par les organismes de certification
indépendants.
6) Tous les utilisateurs doivent s’assurer qu’ils sont en possession de la dernière édition de cette publication.
7) Aucune responsabilité ne doit être imputée à l’IEC, à ses administrateurs, employés, auxiliaires ou mandataires,
y compris ses experts particuliers et les membres de ses comités d’études et des Comités nationaux de l’IEC,
pour tout préjudice causé en cas de dommages corporels et matériels, ou de tout autre dommage de quelque
nature que ce soit, directe ou indirecte, ou pour supporter les coûts (y compris les frais de justice) et les dépenses
découlant de la publication ou de l’utilisation de cette Publication de l’IEC ou de toute autre Publication de l’IEC,
ou au crédit qui lui est accordé.
8) L’attention est attirée sur les références normatives citées dans cette publication. L’utilisation de publications
référencées est obligatoire pour une application correcte de la présente publication.
9) L’IEC attire l’attention sur le fait que la mise en application du présent document peut entraîner l’utilisation d’un
ou de plusieurs brevets. L’IEC ne prend pas position quant à la preuve, à la validité et à l’applicabilité de tout
droit de brevet revendiqué à cet égard. À la date de publication du présent document, l’IEC n’avait pas reçu
notification qu’un ou plusieurs brevets pouvaient être nécessaires à sa mise en application. Toutefois, il y a lieu
d’avertir les responsables de la mise en application du présent document que des informations plus récentes
sont susceptibles de figurer dans la base de données de brevets, disponible à l’adresse https://patents.iec.ch.
L’IEC ne saurait être tenue pour responsable de ne pas avoir identifié de tels droits de brevet.
L’IEC 60793-2-60 a été établie par le sous-comité 86A: Fibres et câbles, du comité d’études 86
de l’IEC: Fibres optiques. Il s’agit d’une Norme internationale.
Cette deuxième édition annule et remplace la première édition parue en 2008. Cette édition
constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition
précédente:
a) remplacement de "d’intraconnexion" par "d’interconnexion", et ajout de la définition du
concept "fibres d’interconnexion";
b) modification de la limite des diamètres de champ de mode (MFD) nominaux pour les fibres
de type C1;
c) ajout de limites pour la propriété "Diamètre du revêtement primaire - coloré" des fibres de
classe C, et modification des limites de la propriété "Diamètre du revêtement primaire -
incolore" pour les fibres C_80;
d) modification de la force de dénudage pour les fibres de classe C1, de classe C2 et de
classe C3;
e) dans le Tableau 6, remplacement de la propriété "Longueur d’onde de coupure d’une fibre"
par "Longueur d’onde de coupure en câble" et révision de la Note b;
f) dans le Tableau 8, remplacement de la propriété "Longueur d’onde de coupure d’une fibre"
par "Longueur d’onde de coupure en câble" et suppression de la note;
g) dans le Tableau A.1, ajout d’une exigence de diamètre de revêtement de 200 µm pour les
fibres C1_125 et modification des limites de diamètre de revêtement pour les fibres C1_80;
h) dans le Tableau A.2 et le Tableau A.5, ajout d’une exigence de diamètre de revêtement de
200 µm pour les fibres C1_125 et modification des limites de force de dénudage;
i) dans le Tableau A.3, remplacement de la propriété "Longueur d’onde de coupure d’une
fibre" par "Longueur d’onde de coupure en câble", modification de la limite de la propriété
"Longueur d’onde de coupure en câble" et ajout d’une nouvelle note;
j) dans le Tableau A.4, ajout d’exigences de transmission à 1 625 nm et suppression de la
longueur d’onde 1 310 nm pour les fibres de type C1;
k) dans le Tableau C.3, modification des limites de la propriété "Longueur d’onde de coupure
d’une fibre" pour les fibres de type C3;
l) dans le Tableau D.3, remplacement de la propriété "Longueur d’onde de coupure d’une
fibre" par "Longueur d’onde de coupure en câble" pour les fibres de type C4.
Le texte de cette Norme internationale est issu des documents suivants:
Projet Rapport de vote
86A/2599/FDIS 86A/2617/RVD
Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant
abouti à son approbation.
La langue employée pour l’élaboration de cette Norme internationale est l’anglais.
Ce document a été rédigé selon les Directives ISO/IEC, Partie 2, il a été développé selon les
Directives ISO/IEC, Partie 1 et les Directives ISO/IEC, Supplément IEC, disponibles sous
www.iec.ch/members_experts/refdocs. Les principaux types de documents développés par
l’IEC sont décrits plus en détail sous www.iec.ch/publications.
Une liste de toutes les parties de la série IEC 60793, publiées sous le titre général Fibres
optiques, se trouve sur le site web de l’IEC.
Le comité a décidé que le contenu de ce document ne sera pas modifié avant la date de stabilité
indiquée sur le site web de l’IEC sous webstore.iec.ch dans les données relatives au document
recherché. À cette date, le document sera
• reconduit,
• supprimé, ou
• révisé.
1 Domaine d’application
La présente partie de l’IEC 60793 s’applique aux types de fibres optiques C1, C2, C3 et C4,
tels que décrits dans le Tableau 1. Ces fibres sont utilisées pour les interconnexions au sein
de composants ou systèmes optiques, ou entre de tels composants ou systèmes, et sont
optimisées pour assurer une connectivité optique supposant une densité élevée. Lorsque les
fibres peuvent être équipées d’un revêtement supplémentaire ou d’un revêtement protecteur
dans le but de réaliser des fibres amorces protégées, elles peuvent être utilisées sans
revêtement supplémentaire. Toutefois, elles peuvent disposer d’un code couleur.
2 Références normatives
Les documents suivants sont cités dans le texte de sorte qu’ils constituent, pour tout ou partie
de leur contenu, des exigences du présent document. Pour les références datées, seule
l’édition citée s’applique. Pour les références non datées, la dernière édition du document de
référence s’applique (y compris les éventuels amendements).
IEC 60793-1-20, Fibres optiques - Partie 1-20: Méthodes de mesure et procédures d’essai -
Géométrie de la fibre
IEC 60793-1-21, Fibres optiques - Partie 1-21: Méthodes de mesure et procédures d’essai -
Géométrie du revêtement
IEC 60793-1-22, Fibres optiques - Partie 1-22: Méthodes de mesure et procédures d’essai -
Mesure de la longueur
IEC 60793-1-30, Fibres optiques - Partie 1-30: Méthodes de mesure et procédures d’essai -
Essais de résistance des fibres
IEC 60793-1-31, Fibres optiques - Partie 1-31: Méthodes de mesure et procédures d’essai -
Résistance à la traction
IEC 60793-1-32, Fibres optiques - Partie 1-32: Méthodes de mesure et procédures d’essai -
Dénudabilité du revêtement
IEC 60793-1-33, Fibres optiques - Partie 1-33: Méthodes de mesure et procédures d’essai -
Résistance à la corrosion sous contrainte
IEC 60793-1-40, Fibres optiques - Partie 1-40: Méthodes de mesure de l’affaiblissement
IEC 60793-1-44, Fibres optiques - Partie 1-44: Méthodes de mesure et procédures d’essai -
Longueur d’onde de coupure
IEC 60793-1-45, Fibres optiques - Partie 1-45: Méthodes de mesure et procédures d’essai -
Diamètre du champ de mode
IEC 60793-1-46, Fibres optiques - Partie 1-46: Méthodes de mesure et procédures d’essai -

Contrôle des variations de l’affaiblissement
IEC 60793-1-47, Fibres optiques - Partie 1-47: Méthodes de mesure et procédures d’essai -
Pertes par macrocourbures
IEC 60793-1-50, Fibres optiques - Partie 1-50: Méthodes de mesure et procédures d’essai -
Essais de chaleur humide (état continu)
IEC 60793-1-51, Fibres optiques - Partie 1-51: Méthodes de mesure et procédures d’essai -
Essais de chaleur sèche (état continu)
IEC 60793-1-52, Fibres optiques - Partie 1-52: Méthodes de mesure et procédures d’essai -
Essais de variations de température
IEC 60793-2, Fibres optiques - Partie 2: Spécifications de produits - Généralités
3 Termes, définitions, symboles et abréviations
3.1 Termes et définitions
Pour les besoins du présent document, les termes et les définitions de l’IEC 60793-2 ainsi que
les suivants s’appliquent. De plus, les définitions des attributs spécifiés sont contenues dans
les méthodes d’essai.
L’ISO et l’IEC tiennent à jour des bases de données terminologiques destinées à être utilisées
en normalisation, consultables aux adresses suivantes:
• IEC Electropedia: disponible à l’adresse https://www.electropedia.org/
• ISO Online browsing platform: disponible à l’adresse https://www.iso.org/obp
3.1.1
fibre d’interconnexion
fibre d’une longueur allant jusqu’à 1 km, utilisée au sein de composants ou systèmes optiques,
ou entre de tels composants ou systèmes, pour assurer une connectivité optique supposant
une densité élevée
3.2 Symboles et abréviations
Les symboles et abréviations suivants sont utilisés dans le présent document:
F force de dénudage moyenne
avg
F force de dénudage maximale
peak
MFD Mode Field Diameter (diamètre du champ de mode)
n paramètre de corrosion sous contrainte – dynamique
d
4 Spécifications
4.1 Généralités
Les exigences générales définies dans l’IEC 60793-2 s’appliquent à ces fibres. Les exigences
spécifiques qui sont communes à ces fibres figurent dans le corps du texte. Les exigences
particulières relatives aux types de fibres individuelles ou à leurs applications sont définies
dans l’Annexe A, l’Annexe B, l’Annexe C et l’Annexe D, qui renvoient aux spécifications de
famille normatives. Ces spécifications de famille se distinguent d’après les longueurs d’onde
de transmission optimales et le diamètre de champ de mode (MFD) nominal, ce qui affecte la
perte d’épissure.
Pour chaque spécification de famille, il existe deux sous-catégories qui se distinguent d’après
le diamètre de la gaine et d’autres attributs connexes. Au diamètre de gaine conventionnel
nominal de 125 μm, s’ajoute avec le produit de type gaine réduite un diamètre nominal de 80 μm.
La distinction est établie par les suffixes suivants: "_125" ou "_80". Par exemple, le choix d’une
fibre de type C1 peut porter sur une fibre "C1_125" ou "C1_80". Il convient que les
caractéristiques de transmission des deux choix de diamètre de gaine soient les mêmes.
Pour chaque spécification de famille, à l’exception des fibres de type C1, il existe deux sous-
catégories qui se distinguent d’après leurs caractéristiques de transmission qui sont liées au
MFD. Pour désigner ces sous-catégories, un suffixe "_a" ou "_b" est ajouté pour désigner
respectivement un petit MFD ou un grand MFD. En général, les fibres peuvent être optimisées
soit pour la perte d’épissure, soit pour les pertes dues aux macrocourbures, soit les deux à la
fois, en utilisant le MFD comme variable principale. Une fibre de type C2, dont le diamètre de
gaine est de 80 μm et qui présente un petit MFD, est désignée par C2_80_a.
Les fibres pour la spécification de famille C1_125 peuvent être choisies parmi les fibres
unimodales de catégorie B-652.B, B-652.D ou B-657, et elles conviennent pour une utilisation
avec n’importe quelle fibre unimodale de classe B sur des longueurs d’onde comprises entre
1 260 nm et 1 625 nm. Les fibres pour les spécifications de famille C2 et C3 sont optimisées à
des longueurs d’onde nominales de respectivement 1 310 nm et 1 550 nm, pour être
raccordées à n’importe quelle fibre unimodale de classe B. Les fibres pour la spécification de
famille C4 sont optimisées pour transporter la lumière de
...

IEC 60793-2-60 ®
Edition 2.0 2025-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Optical fibres -
Part 2-60: Product specifications - Sectional specification for class C single-
mode interconnection fibres
Fibres optiques -
Partie 2-60: Spécifications de produits - Spécification intermédiaire pour les
fibres d’interconnexion unimodales de classe C
ICS 33.180.10  ISBN 978-2-8327-0707-4

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or
by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either
IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC copyright
or have an enquiry about obtaining additional rights to this publication, please contact the address below or your local
IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni
utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et
les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - IEC Products & Services Portal - products.iec.ch
webstore.iec.ch/advsearchform Discover our powerful search engine and read freely all the
The advanced search enables to find IEC publications by a publications previews, graphical symbols and the glossary.
variety of criteria (reference number, text, technical With a subscription you will always have access to up to date
committee, …). It also gives information on projects, content tailored to your needs.

replaced and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published containing more than 22 500 terminological entries in English
details all new publications released. Available online and and French, with equivalent terms in 25 additional languages.
once a month by email. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer
Service Centre: sales@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Recherche de publications IEC -  IEC Products & Services Portal - products.iec.ch
webstore.iec.ch/advsearchform Découvrez notre puissant moteur de recherche et consultez
La recherche avancée permet de trouver des publications gratuitement tous les aperçus des publications, symboles
IEC en utilisant différents critères (numéro de référence, graphiques et le glossaire. Avec un abonnement, vous aurez
texte, comité d’études, …). Elle donne aussi des toujours accès à un contenu à jour adapté à vos besoins.
informations sur les projets et les publications remplacées
ou retirées. Electropedia - www.electropedia.org
Le premier dictionnaire d'électrotechnologie en ligne au
IEC Just Published - webstore.iec.ch/justpublished monde, avec plus de 22 500 articles terminologiques en
Restez informé sur les nouvelles publications IEC. Just anglais et en français, ainsi que les termes équivalents
Published détaille les nouvelles publications parues. dans 25 langues additionnelles. Egalement appelé
Disponible en ligne et une fois par mois par email. Vocabulaire Electrotechnique International (IEV) en ligne.

Service Clients - webstore.iec.ch/csc
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-
nous: sales@iec.ch.
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms, definitions, symbols, and abbreviated terms . 6
3.1 Terms and definitions. 6
3.2 Symbols and abbreviated terms . 6
4 Specifications . 6
4.1 General . 6
4.2 Dimensional requirements . 7
4.3 Mechanical requirements . 8
4.4 Transmission requirements . 8
4.5 Environmental requirements . 9
4.5.1 General . 9
4.5.2 Transmission requirements . 10
4.5.3 Mechanical requirements . 10
Annex A (normative) Family specification for C1 single-mode fibres. 12
A.1 General . 12
A.2 Dimensional requirements . 12
A.3 Mechanical requirements . 12
A.4 Transmission requirements . 13
A.5 Environmental requirements . 13
A.5.1 General . 13
A.5.2 Transmission requirements . 13
A.5.3 Mechanical requirements – Coating strip force . 14
Annex B (normative) Family specification for C2 single-mode fibres. 15
B.1 General . 15
B.2 Dimensional requirements . 15
B.3 Mechanical requirements . 15
B.4 Transmission requirements . 15
B.5 Environmental requirements . 16
B.5.1 General . 16
B.5.2 Transmission requirements . 16
B.5.3 Mechanical requirements – Coating strip force . 16
Annex C (normative) Family specification for C3 single-mode fibres . 17
C.1 General . 17
C.2 Dimensional requirements . 17
C.3 Mechanical requirements . 17
C.4 Transmission requirements . 18
C.5 Environmental requirements . 18
C.5.1 General . 18
C.5.2 Transmission requirements . 18
C.5.3 Mechanical requirements – Coating strip force . 18
Annex D (normative) Family specification for C4 single-mode fibres . 19
D.1 General . 19
D.2 Dimensional requirements . 19
D.3 Mechanical requirements . 19
D.4 Transmission requirements . 20
D.5 Environmental requirements . 20
D.5.1 General . 20
D.5.2 Transmission requirements . 20
D.5.3 Mechanical requirements – Coating strip force . 20
Bibliography . 21

Table 1 – List of families and main differences . 7
Table 2 – Dimensional attributes and measurement methods . 7
Table 3 – Requirements common to class C fibres . 8
Table 4 – Mechanical attributes and measurement methods . 8
Table 5 – Mechanical requirements common to class C fibres . 8
Table 6 – Transmission attributes and measurement methods . 9
Table 7 – Transmission requirements common to class C fibres . 9
Table 8 – Transmission attributes required in family specifications . 9
Table 9 – Environmental attributes and test methods . 9
Table 10 – Environment-dependent mechanical or transmission attributes and test
methods . 10
Table 11 – Tensile strength requirements common to class C fibres . 10
Table 12 – Stress corrosion susceptibility requirements common to class C fibres . 11
Table A.1 – Dimensional requirements for C1 fibres. 12
Table A.2 – Mechanical requirements for C1 fibres . 12
Table A.3 – Transmission requirements for C1 fibres . 13
Table A.4 – Environment-dependent transmission requirements for C1 fibres . 13
Table A.5 – Environment-dependent mechanical requirements for C1 fibres . 14
Table B.1 – Dimensional requirements for C2 fibres. 15
Table B.2 – Mechanical requirements for C2 fibres . 15
Table B.3 – Transmission requirements for C2 fibres . 16
Table B.4 – Environment-dependent transmission requirements for C2 fibres . 16
Table B.5 – Environment-dependent mechanical requirements for C2 fibres . 16
Table C.1 – Dimensional requirements for C3 fibres . 17
Table C.2 – Mechanical requirements for C3 fibres . 17
Table C.3 – Transmission requirements for C3 fibres . 18
Table C.4 – Environment-dependent transmission requirements for C3 fibres . 18
Table C.5 – Environment-dependent mechanical requirements for C3 fibres . 18
Table D.1 – Dimensional requirements for C4 fibres . 19
Table D.2 – Mechanical requirements for C4 fibres . 19
Table D.3 – Transmission requirements for C4 fibres . 20
Table D.4 – Environment-dependent transmission requirements for C4 fibres . 20

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Optical fibres -
Part 2-60: Product specifications - Sectional specification
for class C single-mode interconnection fibres

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 60793-2-60 has been prepared by subcommittee 86A: Fibres and cables, of IEC technical
committee 86: Fibre optics. It is an International Standard.
This second edition cancels and replaces the first edition published in 2008. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) replacement of "intraconnection" with "interconnection" and addition of the definition of
"interconnection fibres";
b) modification of the nominal MFD limit of C1 fibres;
c) addition of "Primary coating diameter-coloured" limits for class C fibres and change of
"Primary coating diameter-uncoloured" limits for class C_80 fibres;
d) change of coating strip force limits for class C1, class C2, and class C3 fibres;
e) replacement of "Fibre cut-off wavelength" with "Cable cut-off wavelength" and revision of
"Note b" in Table 6;
f) replacement of "Fibre cut-off wavelength" with "Cable cut-off wavelength" and deletion of
the "Note" in Table 8;
g) addition of 200 μm coating diameter requirements for C1_125 fibres and change of coating
diameters limits for C1_80 fibres in Table A.1;
h) addition of 200 µm coating diameter requirements for C1_125 fibres and change of coating
strip force limits in Table A.2 and in Table A.5;
i) replacement of "Fibre cut-off wavelength" with "Cable cut-off wavelength", modification of
the "Cable cut-off wavelength" limit and addition of a new "Note" in Table A.3;
j) addition of a transmission requirements at 1 625 nm and deletion of 1 310 nm for C1 fibres
in Table A.4;
k) modification of "Fibre cut-off wavelength" limits of C3 fibres in Table C.3;
l) replacement of "Fibre cut-off wavelength" with "Cable cut-off wavelength" for C4 fibres in
Table D.3.
The text of this International Standard is based on the following documents:
Draft Report on voting
86A/2599/FDIS 86A/2617/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 60793 series, published under the general title Optical fibres can
be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
1 Scope
This part of IEC 60793 is applicable to optical fibre types C1, C2, C3, and C4, as described in
Table 1. These fibres are used for the interconnections within or between optical components
systems and are optimized to support dense optical connectivity. While the fibres can be
overcoated or buffered for the purpose of making protected pigtails, they can be used without
overcoating. They can, however, be colour coded.
2 Normative references
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.
IEC 60793-1-20, Optical fibres - Part 1-20: Measurement methods and test procedures - Fibre
geometry
IEC 60793-1-21, Optical fibres - Part 1-21: Measurement methods and test procedures -
Coating geometry
IEC 60793-1-22, Optical fibres - Part 1-22: Measurement methods and test procedures - Length
measurement
IEC 60793-1-30, Optical fibres - Part 1-30: Measurement methods and test procedures - Fibre
proof test
IEC 60793-1-31, Optical fibres - Part 1-31: Measurement methods and test procedures - Tensile
strength
IEC 60793-1-32, Optical fibres - Part 1-32: Measurement methods and test procedures -
Coating strippability
IEC 60793-1-33, Optical fibres - Part 1-33: Measurement methods and test procedures - Stress
corrosion susceptibility
IEC 60793-1-40, Optical fibres - Part 1-40: Attenuation measurement methods
IEC 60793-1-44, Optical fibres - Part 1-44: Measurement methods and test procedures - Cut-
off wavelength
IEC 60793-1-45, Optical fibres - Part 1-45: Measurement methods and test procedures - Mode
field diameter
IEC 60793-1-46, Optical fibres - Part 1-46: Measurement methods and test procedures –

Monitoring of changes in attenuation
IEC 60793-1-47, Optical fibres - Part 1-47: Measurement methods and test procedures -
Macrobending loss
IEC 60793-1-50, Optical fibres - Part 1-50: Measurement methods and test procedures - Damp
heat (steady state) tests
IEC 60793-1-51, Optical fibres - Part 1-51: Measurement methods and test procedures - Dry
heat (steady state) tests
IEC 60793-1-52, Optical fibres - Part 1-52: Measurement methods and test procedures -
Change of temperature tests
IEC 60793-2, Optical fibres - Part 2: Product specifications - General
3 Terms, definitions, symbols, and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60793-2 and the
following apply. Moreover, the definitions of the specified attributes are contained in the test
methods.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1.1
interconnection fibre
fibre up to 1 km long that is used within or between optical components or systems to support
dense connectivity
3.2 Symbols and abbreviated terms
The following symbols and abbreviated terms are used in this document:
F average strip force
avg
F peak strip force
peak
MFD mode field diameter
n stress corrosion parameter – dynamic
d
4 Specifications
4.1 General
The general requirements defined in IEC 60793-2 apply to these fibres. Specific requirements
that are common to these fibres are found in the body of this text. Particular requirements for
individual fibre types or applications are defined in Annex A, Annex B, Annex C and Annex D,
which refer to normative family specifications. These family specifications are distinguished
based on optimum transmission wavelengths and nominal mode field diameter (MFD), which
affects splice loss.
For each family specification, there are two sub-categories that are distinguished on the basis
of the cladding diameter and other related attributes. The conventional nominal cladding
diameter of 125 μm is augmented by the reduced cladding type product with a nominal diameter
of 80 μm. These are distinguished with suffixes "_125" or "_80". For example, the C1 fibre can
be selected as "C1_125" or "C1_80". The transmission characteristics of both the cladding
diameter choices should be the same.
For each family specification except C1, there are two sub-categories that are distinguished on
the basis of transmission characteristics that relate to MFD. To denote these sub-categories,
suffix "_a" or "_b" is added, for lower or higher MFD. In general, the fibres can be optimised for
either splice loss or macro-bend loss or both using MFD as a main variable. A C2 fibre with an
80 μm cladding diameter and lower MFD is designated as C2_80_a.
Fibres for the C1_125 family specification can be selected from category B-652.B or B-652.D
or B-657 single-mode fibres and are suitable for use with any class B single-mode fibre at
wavelengths from 1 260 nm to 1 625 nm. Fibres for the C2 and C3 family specifications are
optimized at nominal wavelengths of 1 310 nm and 1 550 nm respectively for connection to any
class B single-mode fibre. Fibres for the C4 family specification are optimized for transporting
optical amplifier pump light at 980 nm or higher.
Table 1 – List of families and main differences
Families Nominal transmission wavelengths Nominal MFDs
nm
C1 1 260, 1 310,1 550 and 1 625 8,6 to 9,2 μm at 1 310 nm
C2 1 310 5,0 to 7,0 μm at 1 310 nm
C3 1 550 and 1 625 5,5 to 7,5 μm at 1 550 nm
C4 980 4,0 to 7,0 μm at 980 nm

The fibre shall consist of a glass core, a glass cladding, and a coating in accordance with 5.3
of IEC 60793-2:2019.
4.2 Dimensional requirements
Table 2 specifies both the dimensional attributes and the corresponding measurement methods
that shall be applied. Minimum dimensional requirements, common to all Class C fibres, shall
be as specified in Table 3. Some family specification requirements can be stricter.
Table 2 – Dimensional attributes and measurement methods
Attributes Measurement methods
Cladding diameter IEC 60793-1-20
Cladding non-circularity IEC 60793-1-20
Core concentricity error IEC 60793-1-20
Coating diameter IEC 60793-1-21
Coating non-circularity IEC 60793-1-21
Cladding-coating concentricity error IEC 60793-1-21
Fibre length IEC 60793-1-22
Table 3 – Requirements common to class C fibres
Attributes Units _125 Limits _80 Limits
Cladding diameter μm 125 ± 1,0 80 ± 1,0
Cladding non-circularity % ≤ 1,0 ≤ 1,0
Core concentricity error μm ≤ 0,5 ≤ 0,5
Primary coating diameter – μm 235 to 255 150 to 170
a c
uncoloured
Primary coating diameter – μm 235 to 265 150 to 180
a c
coloured
b b
Fibre length km
a
Tolerance applies to the entire length of fibre.
b
Length requirements vary and should be agreed between customer and supplier.
c
These limits on primary coating diameters are most commonly used. Other
coating diameters shall be specified in the family specifications.

4.3 Mechanical requirements
Table 4 specifies both the mechanical attributes and the corresponding measurement methods
that shall be applied. Minimum mechanical requirements, common to all fibres in class C, are
given in Table 5. Some family specification values can be stricter.
Table 4 – Mechanical attributes and measurement methods
Attributes Measurement methods
Proof test IEC 60793-1-30
Tensile strength IEC 60793-1-31
Coating strippability IEC 60793-1-32
Stress corrosion susceptibility IEC 60793-1-33

Table 5 – Mechanical requirements common to class C fibres
Attributes Units Limits
Proof stress level GPa ≥ 0,69
a
Coating strip force
Tensile strength (median) for a GPa ≥ 3,8
0,5 m specimen length
a
The coating strip force is a common requirement for all Class C fibres. Refer to
the Annexes of this document for detailed specifications.

4.4 Transmission requirements
Table 6 specifies both the transmission attributes and the corresponding measurement methods
that shall be applied. Some family specifications can have additional attributes or test methods.
Minimum transmission requirements, common to all class C fibres, shall be as specified in
Table 7. Some family specifications can be stricter. Requirements that shall be specified in the
family specifications are listed in Table 8.
Table 6 – Transmission attributes and measurement methods
Attributes Measurement methods
a
Attenuation coefficient
IEC 60793-1-40
b
Cable cut-off wavelength
IEC 60793-1-44
Mode field diameter IEC 60793-1-45
Macrobending loss IEC 60793-1-47
a
The attenuation coefficient at various wavelengths can be calculated using the
measured values at a few wavelengths using a spectral model such as the one
given in IEC 60793-1-40. For example, the attenuation at 1 480 nm can be
calculated and used for design of systems that employ remote pumping of optical
amplifiers.
b
Cut-off wavelength intrinsically contains length or bending dependence. In the
case of a short length deployment condition (e.g. a piece length shorter than 22 m
without specific bending), cut-off wavelength under the expected condition should
be ensured to have negligible influence on system performance.

Table 7 – Transmission requirements common to class C fibres
Attributes Units Limits
This table is empty, but retained in case of some
common minimum requirement.
Table 8 – Transmission attributes required in family specifications
Attributes required in family specifications
Maximum attenuation coefficient at operating wavelengths
Nominal mode field diameter, tolerance, and wavelength
Maximum macro-bending loss, wavelength, bend radius, and number of turns
Maximum cable cut-off wavelength

4.5 Environmental requirements
4.5.1 General
Environmental attribute tests and measurement methods are documented in two forms:
– environmental attributes and the corresponding measurement methods shall be as specified
in Table 9;
– Environment-dependent mechanical or transmission attributes and their corresponding
measurement methods shall be as specified in Table 10.
Table 9 – Environmental attributes and test methods
Environmental exposures Measurement methods
Damp heat tests IEC 60793-1-50
Dry heat tests IEC 60793-1-51
Change of temperature tests IEC 60793-1-52

Table 10 – Environment-dependent mechanical
or transmission attributes and test methods
Attributes Measurement methods
Change in attenuation IEC 60793-1-46
Attenuation IEC 60793-1-40
Coating strip force IEC 60793-1-32
Tensile strength IEC 60793-1-31
Stress corrosion sensitivity IEC 60793-1-33

These tests are normally conducted periodically as type-tests for a fibre and coating design.
The recovery period allowed between completing the environmental exposure and performing
the attribute measurements shall be as specified in the particular environmental conditioning
test standards listed in Table 9.
4.5.2 Transmission requirements
Change in attenuation from the initial value shall be less than the values specified in the relevant
family specification.
4.5.3 Mechanical requirements
4.5.3.1 General
These tests are, in practice, the most severe requirements amongst the environment exposures
defined in Table 9.
4.5.3.2 Coating strip force
In addition to the un-aged strip force requirements in 4.3, coating strip force after damp heat
ageing shall be specified in the family specifications. The ageing options are also specified.
4.5.3.3 Tensile strength
The attributes given in Table 11 shall be verified following removal of the fibre from the test
environment.
Table 11 – Tensile strength requirements common to class C fibres
Environment Median tensile strength 15 % of the tensile strength
(GPa), distribution (GPa),
specimen length: 0,5 m specimen length: 0,5 m
Damp heat ≥ 3,03 ≥ 2,76
The requirements given in Table 11 do not apply to hermetically coated fibres or to fibres that
are intended for sole use within hermetically sealed enclosures.
4.5.3.4 Stress corrosion susceptibility
The attributes given in Table 12 shall be verified following removal of the fibres from the test
environment.
Table 12 – Stress corrosion susceptibility requirements common to class C fibres
Environment Stress corrosion
Susceptibility constant, n
d
Damp heat ≥ 18
The requirements given in Table 12 do not apply to hermetically coated fibres or to fibres that
are intended for sole use within hermetically sealed enclosures.

Annex A
(normative)
Family specification for C1 single-mode fibres
A.1 General
The C1 single-mode fibre is a single-mode interconnection fibre that is suitable for use with any
category B single-mode fibre at wavelengths from 1 260 nm to 1 625 nm. It is optimised for
precision glass geometry and improved macro-bending, and generally have lower fibre cut-off
wavelength compared to that of B-652 fibres.
Clause A.2 to Clause A.5 contain the requirements for C1 fibres. Common requirements, copied
for ease of reference from the sectional specification, are noted by an entry in the “Ref.” column.
Relevant notes from the sectional specification are not repeated but indicated with a superscript.
A.2 Dimensional requirements
Table A.1 contains dimensional requirements for C1 fibres.
Table A.1 – Dimensional requirements for C1 fibres
Attributes Units _125 limits _125 limits _80 limits Ref.
(250 μm coating) (200 μm coating)
Cladding diameter μm 125,0 ± 0,7 80 ± 1,0 4.2
125,0 ± 0,7
Cladding non-circularity % ≤ 0,7 ≤ 0,7 ≤ 1,0 4.2
Core concentricity error μm ≤ 0,5 ≤ 0,5 ≤ 0,5 4.2
a
Primary coating diameter – μm 235 to 255 150 to 170 4.2
180 to 210
uncoloured
a
Primary coating diameter – μm 235 to 265 150 to 180 4.2
180 to 220
coloured
Fibre length km (See 4.2) (See 4.2) (See 4.2) 4.2
a
These limits on primary coating diameters are most commonly used. There are other applications, such
as fibres for use within optical sub-systems, pigtails, or specialty applications, which use other primary
coating diameters such as 150 μm to 170 μm uncoloured and 150 μm to 180 μm coloured

A.3 Mechanical requirements
Table A.2 contains mechanical requirements for C1 fibres.
Table A.2 – Mechanical requirements for C1 fibres
Attributes Units _125 limits _125 limits _80 limits Ref.
(250 μm coating) (200 μm coating)
Proof stress level GPa ≥ 0,69 4.3

Coating strip force (average) N 1,0 ≤ F ≤ 5,0 0,4 ≤ F ≤ 5,0 0,4 ≤ F ≤ 5,0 4.3
avg avg avg
Coating strip force (peak) N 1,0 ≤ F ≤ 8,9 0,4 ≤ F ≤ 8,9 0,4 ≤ F ≤ 8,9 4.3
peak peak peak
Tensile strength (median) GPa ≥ 3,8 4.3
for 0,5 m specimen length
A.4 Transmission requirements
Table A.3 contains transmission requirements for C1 fibres. The specified limits apply to both
_125 and _80 fibres.
Table A.3 – Transmission requirements for C1 fibres
Attributes Units Limits Ref.
Attenuation coefficient dB/km ≤ 0,7 4.4
from 1 260 nm to 1 625 nm
Mode field diameter range of nominal values at 1 310 nm 8,6 to 9,2 4.4
µm
Mode field diameter tolerance µm ± 0,4 4.4

Cable cut-off wavelength nm ≤ 1 260 4.4
Macro-bending loss at 1 625 nm, dB ≤ 1,0 4.4
5 turns on a 16 mm radius mandrel
a
Cut-off wavelength intrinsically contains length or bending dependence. In the case of a short length
deployment condition (e.g. a piece length shorter than 22 m without specific bending), cut-off wavelength under
the expected condition should be ensured to have negligible influence on system performance.

A.5 Environmental requirements
A.5.1 General
Subclause A.5.2 and A.5.3 contain requirements specific to C1 fibres. The specified limits apply
to all sub-categories.
A.5.2 Transmission requirements
Change in attenuation from the initial value shall be less than the values specified in Table A.4.
Attenuation shall be measured periodically during the entire exposure to each environment and
after removal.
Table A.4 – Environment-dependent transmission requirements for C1 fibres
Environment Wavelengths Maximum attenuation increase
nm dB/km
Damp heat 1 550 ≤ 0,10
1 625 ≤ 0,10
Dry heat 1 550 ≤ 0,10
1 625 ≤ 0,10
Change of temperature 1 550 ≤ 0,10
1 625 ≤ 0,10
A.5.3 Mechanical requirements – Coating strip force
Table A.5 shows attributes that shall be verified following removal of the fibre from the test
environment.
Table A.5 – Environment-dependent mechanical requirements for C1 fibres
Environment Average strip force Peak strip force
N N
_125 Damp heat 1,0 ≤ F ≤ 5,0 1,0 ≤ F ≤ 8,9
avg peak
(250 μm coating)
_125 Damp heat 0,4 ≤ F ≤ 5,0 0,4 ≤ F ≤ 8,9
avg peak
(200 μm coating)
_80 Damp heat 0,4 ≤ F ≤ 5,0 0,4 ≤ F ≤ 8,9
avg peak
Annex B
(normative)
Family specification for C2 single-mode fibres
B.1 General
The C2 single-mode fibre is a reduced bend loss single-mode interconnection fibre that is
optimized for loss performance in the 1 310 nm region.
Clause B.2 to Clause B.5 contain the requirements for C2 fibres. Common requirements, copied
for ease of reference from the sectional specification, are noted by an entry in the “Ref.” column.
Relevant notes from the sectional specification are not repeated but indicated with a superscript.
B.2 Dimensional requirements
Table B.1 contains dimensional requirements for C2 fibres. The specified limits apply to both
“_a” and “_b” sub-categories.
Table B.1 – Dimensional requirements for C2 fibres
Attributes Units _125 limits _80 limits Ref.
Cladding diameter μm 125,0 ± 1,0 80,0 ± 1,0 4.2
Cladding non-circularity % ≤ 1,0 ≤ 1,0 4.2
Core concentricity error μm ≤ 0,5 ≤ 0,5 4.2
Primary coating diameter – uncoloured μm 235 to 255 150 to 170 4.2
Primary coating diameter – coloured μm 235 to 265 150 to 180 4.2
Fibre length km (See 4.2) (See 4.2) 4.2

B.3 Mechanical requirements
Table B.2 contains mechanical requirements for C2 fibres. The specified limits apply to both
“_a” and “_b” sub-categories.
Table B.2 – Mechanical requirements for C2 fibres
Attributes Units _125 limits _80 limits Ref.

Proof stress level GPa ≥ 0,69 4.3
Coating strip force (average) N 1,0 ≤ F ≤ 0,4 ≤ F ≤ 5,0 4.3
avg avg
5,0
Coating strip force (peak) N 1,0 ≤ F 0,4 ≤ F ≤ 8,9 4.3
peak peak
≤ 8,9
Tensile strength (median) for GPa ≥ 3,8 4.3
0,5 m specimen length
B.4 Transmission requirements
Table B.3 contains transmission requirements for C2 fibres. The specified limits apply to both
80 μm and 125 μm nominal cladding diameter sub-categories.
Table B.3 – Transmission requirements for C2 fibres
Attributes Units _a limits _b limits Ref.
Attenuation coefficient at 1 310 nm dB/km ≤ 0,75 ≤ 0,75 4.4
Mode field diameter range of nominal values at μm 5,0 to 6,0 6,1 to 7,0 4.4
1 310 nm
Mode field diameter tolerance μm ± 0,75 ± 0,75 4.4
Fibre cut-off wavelength nm ≤ 1 280 ≤ 1 280 4.4
Macro-bending loss at 1 550 nm, 5 turns on a 10 mm dB ≤ 0,02 ≤ 0,05 4.4
radius mandrel
B.5 Environmental requirements
B.5.1 General
Subclause B.5.2 and B.5.3 contain requirements specific to C2 fibres. The specified limits apply
to all sub-categories.
B.5.2 Transmission requirements
Change in attenuation from the initial value shall be less than the values in Table B.4.
Attenuation shall be measured periodically during the entire exposure to each environment and
after removal.
Table B.4 – Environment-dependent transmission requirements for C2 fibres
Environment Wavelengths Maximum attenuation increase
nm dB/km
Damp heat 1 310 ≤ 0,10
Dry heat 1 310 ≤ 0,10
Change of temperature 1 310 ≤ 0,10

B.5.3 Mechanical requirements – Coating strip force
Table B.5 shows attributes that shall be verified following removal of the fibres from the test
environment.
Table B.5 – Environment-dependent mechanical requirements for C2 fibres
Environment Average strip force Peak strip force
N N
_125 Damp heat 1,0 ≤ F ≤ 5,0 1,0 ≤ F ≤ 8,9
avg peak
_80 Damp heat 0,4 ≤ F ≤ 5,0 0,4 ≤ F ≤ 8,9
avg peak
Annex C
(normative)
Family specification for C3 single-mode fibres
C.1 General
The C3 single-mode fibre is a reduced bend loss single-mode interconnection fibre that is
optimized for loss performance in the 1 550 nm region.
Clause C.2 to Clause C.5 contain the requirements for C3 fibres. Common requirements, copied
for ease of reference from the sectional specification, are noted by an entry in the “Ref.” column.
Relevant notes from the sectional specification are not repeated but indicated with a superscript.
C.2 Dimensional requirements
Table C.1 contains dimensional requirements for C3 fibres. The specified limits apply to both
“_a” and “_b” sub-categories.
Table C.1 – Dimensional requirements for C3 fibres
Attributes Units _125 limits _80 limits Ref.
Cladding diameter μm 125,0 ± 1,0 80,0 ± 1,0 4.2
Cladding non-circularity % ≤ 1,0 ≤ 1,0 4.2
Core concentricity error μm ≤ 0,5 ≤ 0,5 4.2
Primary coating diameter – uncoloured μm 235 to 255 150 to 170 4.2
Primary coating diameter – coloured μm 235 to 265 150 to 180 4.2
Fibre length km (See 4.2) (See 4.2) 4.2

C.3 Mechanical requirements
Table C.2 contains mechanical requirements for C3 fibres. The specified limits apply to both
“_a” and “_b” sub-categories.
Table C.2 – Mechanical requirements for C3 fibres
Attributes Units _125 limits _80 limits Ref.

Proof stress level GPa ≥ 0,69 4.3

Coating strip force (average) N 1,0 ≤ F 5,0 0,4 ≤ F ≤ 5,0 4.3
av
...