IEC 60793-2-50:2015

Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres

IEC 60793-2-50:2015 is applicable to optical fibre categories B1.1, B1.2, B1.3, B2, B4, B5 and B6. A map illustrating the connection of IEC designations to ITU-T designations is shown in Annex I. These fibres are used or can be incorporated in information transmission equipment and optical fibre cables. Three types of requirements apply to these fibres:
- general requirements, as defined in IEC 60793-2;
- specific requirements common to the class B single-mode fibres covered in this standard and which are given in Clause 5;
- particular requirements applicable to individual fibre categories or specific applications, which are defined in Annexes A to G. For some fibre categories (shown in the relevant family specifications), there are sub-categories that are distinguished on the basis of difference in transmission attribute specifications. The designations for these sub-categories are documented in the individual family specifications. This fifth edition cancels and replaces the fourth edition, published in 2012. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- aligns the requirements with the ITU-T Recommendations G.654 (2012-10) and G.657 (2012-10);
- adds a new sub-category B1.2_d;
- modifies B6 sub-categories in terms of attenuation and chromatic dispersion coefficient. Keywords: information transmission equipment, optical fibre cables

Fibres optiques - Partie 2-50: Spécifications de produits - Spécification intermédiaire pour les fibres unimodales de classe B

L'IEC 60793-2-50:2015 est applicable aux fibres optiques des catégories B1.1, B1.2, B1.3, B2, B4, B5 et B6. Un tableau illustrant la correspondance des désignations IEC avec les Recommandations de l'UIT-T figure à l'Annexe I. Ces fibres sont utilisées ou peuvent être intégrées dans des équipements pour la transmission de l'information et dans des câbles à fibres optiques. Trois types d'exigences s'appliquent à ces fibres:
- les exigences générales, qui sont définies dans l'IEC 60793-2;
- des exigences spécifiques communes aux fibres unimodales de classe B, couvertes par la présente norme, et qui sont données dans l'Article 5;
- des exigences particulières applicables à des catégories particulières de fibres ou à des applications données, qui sont définies dans les Annexes A à G. Pour certaines catégories de fibres (indiquées dans les spécifications de famille correspondantes), il existe des sous-catégories qui se distinguent les unes des autres par leurs différences de spécifications d'attributs de transmission. Les désignations pour ces sous-catégories sont documentées dans les spécifications de famille individuelles Cette cinquième édition annule et remplace la quatrième édition parue en 2012. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- alignement des exigences avec les Recommandations G.654 (2012-10) et G.657 (2012-10) de l'UIT-T;
- ajout d'une nouvelle sous-catégorie B1.2_d;
- modification des sous-catégories B6 en termes d'affaiblissement et de coefficient de dispersion chromatique. Mots clés: équipements pour la transmission de l'information, câbles à fibres optiques

General Information

• Status: Published
• Publication Date: 18-Nov-2015
• ICS: 33.180.10 - Fibres and cables
• Technical Committee: SC 86A - Fibres and cables
• Drafting Committee: WG 1 - TC 86/SC 86A/WG 1
• Current Stage: DELPUB - Deleted Publication
• Start Date: 31-Jul-2017
• Completion Date: 14-Dec-2018

Relations

• Revised: IEC 60793-2-50:2018 - Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres
• Effective Date: 05-Sep-2023
• Revises: IEC 60793-2-50:2012 - Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres
• Effective Date: 05-Sep-2023
• Revises: IEC 60793-2-50:2012/COR1:2014 - Corrigendum 1 - Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single mode fibres
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60793-2-50 ®
Edition 5.0 2015-11
INTERNATIONAL
STANDARD
colour
inside
Optical fibres –
Part 2-50: Product specifications – Sectional specification for class B
single-mode fibres
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 Central Office Tel.: [phone]
3, rue de Varembé Fax: [phone]

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Switzerland www.iec.ch
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.

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IEC 60793-2-50 ®
Edition 5.0 2015-11
INTERNATIONAL
STANDARD
colour
inside
Optical fibres –
Part 2-50: Product specifications – Sectional specification for class B

single-mode fibres
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.10 ISBN 978-2-8322-3023-7

– 2 – IEC 60793-2-50:2015 © IEC 2015

CONTENTS
FOREWORD . 5

1 Scope . 7

2 Normative references . 7

3 Terms and definitions . 8

4 Abbreviations and symbols . 9

5 Specifications . 9

5.1 General . 9
5.2 Dimensional requirements . 9
5.3 Mechanical requirements . 10
5.4 Transmission requirements . 11
5.5 Environmental requirements . 12
5.5.1 General . 12
5.5.2 Optical environmental requirements – Attenuation . 13
5.5.3 Mechanical environmental requirements . 13
Annex A (normative) Family specification for category B1.1 single-mode fibres . 15
A.1 General . 15
A.2 Dimensional requirements . 15
A.3 Mechanical requirements . 15
A.4 Transmission requirements . 16
A.5 Environmental requirements . 16
Annex B (normative) Family specification for category B1.2 single-mode fibres . 17
B.1 General . 17
B.2 Dimensional requirements . 17
B.3 Mechanical requirements . 17
B.4 Transmission requirements . 18
B.5 Environmental requirements . 18
Annex C (normative) Family specification for category B1.3 single-mode fibres . 19
C.1 General . 19
C.2 Dimensional requirements . 19
C.3 Mechanical requirements . 19
C.4 Transmission requirements . 20
C.5 Hydrogen ageing for category B1.3 . 20
C.6 Environmental requirements . 21
Annex D (normative) Family specification for category B2 single-mode fibres . 22
D.1 General . 22
D.2 Dimensional requirements . 22
D.3 Mechanical requirements . 22
D.4 Transmission requirements . 23
D.4.1 General . 23
D.4.2 Chromatic dispersion coefficient requirement for sub-category B2_a
fibres . 23
D.4.3 Chromatic dispersion coefficient requirement for sub-category B2_b
fibres . 24
D.5 Environmental requirements . 24
Annex E (normative) Family specification for category B4 single-mode fibres . 25
E.1 General . 25

E.2 Dimensional requirements . 25

E.3 Mechanical requirements . 25

E.4 Transmission requirements . 26

E.4.1 General . 26

E.4.2 Chromatic dispersion coefficient limits for sub-category B4_c fibres . 26

E.4.3 Chromatic dispersion coefficient limits for sub-category B4_d fibres . 27

E.4.4 Chromatic dispersion coefficient limits for sub-category B4_e fibres . 27

E.5 Environmental requirements . 27

Annex F (normative) Family specification for category B5 single-mode fibres . 28

F.1 General . 28
F.2 Dimensional requirements . 28
F.3 Mechanical requirements . 28
F.4 Transmission requirements . 29
F.4.1 General . 29
F.4.2 Chromatic dispersion coefficient for category B5 fibres . 29
F.5 Environmental requirements . 30
Annex G (normative) Family specification for category B6 single-mode fibres . 31
G.1 General . 31
G.2 Dimensional requirements . 31
G.3 Mechanical requirements . 32
G.4 Transmission requirements . 32
G.5 Environmental requirements . 33
Annex H (informative) System design information for category B4 single-mode fibres . 34
H.1 General . 34
H.2 One standard deviation limits for sub-category B4_d fibres . 34
H.3 One standard deviation limits for sub-category B4_e fibres . 35
Annex I (informative) Map from IEC nomenclature to ITU-T recommendations . 36
Bibliography . 37

Figure H.1 – Sub-category B4_d chromatic dispersion coefficient limits . 35
Figure H.2 – Sub-category B4_e chromatic dispersion coefficient limits . 35

Table 1 – Dimensional attributes and measurement methods . 9
Table 2 – Dimensional requirements common to all category B fibres . 10

Table 3 – Mechanical attributes and test methods . 10
Table 4 – Mechanical requirements common to all class B fibres . 11
Table 5 – Transmission attributes and measurement methods . 11
Table 6 – Transmission, requirements common to all class B fibres . 12
Table 7 – Additional transmission attributes required in the family specifications . 12
Table 8 – Environmental exposure tests . 12
Table 9 – Attributes measured in environmental exposure tests . 12
Table 10 – Change in attenuation for environmental tests . 13
Table 11 – Coating strip force for environmental tests . 13
Table 12 – Tensile strength for environmental tests . 13
Table 13 – Stress corrosion susceptibility for environmental tests . 14
Table A.1 – Dimensional requirements specific to category B1.1 fibres . 15

– 4 – IEC 60793-2-50:2015 © IEC 2015

Table A.2 – Mechanical requirements specific to category B1.1 fibres . 15

Table A.3 – Transmission requirements specific to category B1.1 fibres . 16

Table B.1 – Dimensional requirements specific to category B1.2 fibres . 17

Table B.2 – Mechanical requirements specific to category B1.2 fibres . 18

Table B.3 – Transmission requirements specific to category
...

IEC 60793-2-50 ®
Edition 5.0 2015-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical fibres –
Part 2-50: Product specifications – Sectional specification for class B single-
mode fibres
Fibres optiques –
Partie 2-50: Spécifications de produits – Spécification intermédiaire pour les
fibres unimodales de classe B
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

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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
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latest edition, a corrigenda or an amendment might have been published.

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IEC 60793-2-50 ®
Edition 5.0 2015-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical fibres –
Part 2-50: Product specifications – Sectional specification for class B single-

mode fibres
Fibres optiques –
Partie 2-50: Spécifications de produits – Spécification intermédiaire pour les

fibres unimodales de classe B
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.10 ISBN 978-2-8322-3739-7

– 2 – IEC 60793-2-50:2015 © IEC 2015

CONTENTS
FOREWORD . 5

1 Scope . 7

2 Normative references . 7

3 Terms and definitions . 8

4 Abbreviations and symbols . 8

5 Specifications . 9

5.1 General . 9
5.2 Dimensional requirements . 9
5.3 Mechanical requirements . 10
5.4 Transmission requirements . 10
5.5 Environmental requirements . 11
5.5.1 General . 11
5.5.2 Optical environmental requirements – Attenuation . 12
5.5.3 Mechanical environmental requirements . 12
Annex A (normative) Family specification for category B1.1 single-mode fibres . 14
A.1 General . 14
A.2 Dimensional requirements . 14
A.3 Mechanical requirements . 14
A.4 Transmission requirements . 14
A.5 Environmental requirements . 15
Annex B (normative) Family specification for category B1.2 single-mode fibres . 16
B.1 General . 16
B.2 Dimensional requirements . 16
B.3 Mechanical requirements . 16
B.4 Transmission requirements . 17
B.5 Environmental requirements . 17
Annex C (normative) Family specification for category B1.3 single-mode fibres . 18
C.1 General . 18
C.2 Dimensional requirements . 18
C.3 Mechanical requirements . 18
C.4 Transmission requirements . 18
C.5 Hydrogen ageing for category B1.3 . 19
C.6 Environmental requirements . 20
Annex D (normative) Family specification for category B2 single-mode fibres . 21
D.1 General . 21
D.2 Dimensional requirements . 21
D.3 Mechanical requirements . 21
D.4 Transmission requirements . 22
D.4.1 General . 22
D.4.2 Chromatic dispersion coefficient requirement for sub-category B2_a
fibres . 22
D.4.3 Chromatic dispersion coefficient requirement for sub-category B2_b
fibres . 22
D.5 Environmental requirements . 23
Annex E (normative) Family specification for category B4 single-mode fibres . 24
E.1 General . 24

E.2 Dimensional requirements . 24

E.3 Mechanical requirements . 24

E.4 Transmission requirements . 25

E.4.1 General . 25

E.4.2 Chromatic dispersion coefficient limits for sub-category B4_c fibres . 25

E.4.3 Chromatic dispersion coefficient limits for sub-category B4_d fibres . 26

E.4.4 Chromatic dispersion coefficient limits for sub-category B4_e fibres . 26

E.5 Environmental requirements . 26

Annex F (normative) Family specification for category B5 single-mode fibres . 27

F.1 General . 27
F.2 Dimensional requirements . 27
F.3 Mechanical requirements . 27
F.4 Transmission requirements . 28
F.4.1 General . 28
F.4.2 Chromatic dispersion coefficient for category B5 fibres . 28
F.5 Environmental requirements . 28
Annex G (normative) Family specification for category B6 single-mode fibres . 29
G.1 General . 29
G.2 Dimensional requirements . 29
G.3 Mechanical requirements . 30
G.4 Transmission requirements . 30
G.5 Environmental requirements .
...