SIST EN 60793-2-50:2009

Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres (IEC 60793-2-50:2008)

This part of IEC 60793 is applicable to optical fibre types B1.1, B1.2, B1.3, and categories 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 3; - particular requirements applicable to individual fibre types or specific applications, which are defined in Annexes A to G. - For some family specifications, there are sub-categories that are distinguished on the basis of difference in transmission attribute specifications. The designations for these subcategories are documented in the individual family specifications.

Lichtwellenleiter - Teil 2-50: Produktspezifikationen - Rahmenspezifikation für Einmodenfasern der Kategorie B (IEC 60793-2-50:2008)

Fibres optiques - Partie 2-50: Spécifications de produits - Spécification intermédiaire pour les fibres unimodales de classe B (CEI 60793-2-50:2008)

La CEI 60793-2-50:2008 est applicable aux fibres optiques de type B1.1, B1.2, B1.3 et de catégorie B2, B4, B5 et B6. Une table illustrant la correspondance des désignations CEI par rapport aux désignations 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. Cette révision technique  - aligne les exigences avec les Recommandations UIT-T applicables, y compris le resserrement des tolérances de nombreux paramètres;  - ajoute une nouvelle catégorie, B5, qui correspond aux fibres définies dans la Recommandation UIT-T G.656; et  - ajoute une nouvelle catégorie, B6, qui correspond aux fibres définies dans la Recommandation UIT-T G.657.

Optična vlakna - 2-50. del: Specifikacije izdelka - Področna specifikacija za enorodna vlakna razreda B (IEC 60793-2-50:2008)

General Information

• Status: Withdrawn
• Publication Date: 17-Nov-2008
• Withdrawal Date: 09-Dec-2015
• ICS: 33.180.10 - Fibres and cables
• Technical Committee: iTEL - Communication cables
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 10-Dec-2015
• Due Date: 02-Jan-2016
• Completion Date: 10-Dec-2015
• Ref Project: EN 60793-2-50:2008 - Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres

Relations

• Replaces: SIST EN 60793-2-50:2004 - Optical fibres -- Part 2-50: Product specifications - Sectional specification for class B single-mode fibres
• Effective Date: 01-Jan-2009
• Revised: SIST EN 60793-2-50:2013 - Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres
• Effective Date: 06-May-2014
• Replaced By: SIST EN 60793-2-50:2013 - Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres
• Effective Date: 29-Jan-2023
• Replaced By: SIST EN 60793-2-50:2013 - Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres
• Effective Date: 07-Jun-2022
• Replaces: SIST EN 60793-2-50:2004 - Optical fibres -- Part 2-50: Product specifications - Sectional specification for class B single-mode fibres
• Effective Date: 29-Jan-2023
• Revised: SIST EN 60793-2-50:2004 - Optical fibres -- Part 2-50: Product specifications - Sectional specification for class B single-mode fibres
• Effective Date: 04-Oct-2011
• Replaces: SIST EN 60793-2-50:2004 - Optical fibres -- Part 2-50: Product specifications - Sectional specification for class B single-mode fibres
• Effective Date: 07-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 60793-2-50:2009
01-januar-2009
1DGRPHãþD
SIST EN 60793-2-50:2004
2SWLþQDYODNQDGHO6SHFLILNDFLMHL]GHOND3RGURþQDVSHFLILNDFLMD]D
HQRURGQDYODNQDUD]UHGD%,(&
Optical fibres - Part 2-50: Product specifications - Sectional specification for class B
single-mode fibres (IEC 60793-2-50:2008)
Lichtwellenleiter - Teil 2-50: Produktspezifikationen - Rahmenspezifikation für
Einmodenfasern der Kategorie B (IEC 60793-2-50:2008)
Fibres optiques - Partie 2-50: Spécifications de produits - Spécification intermédiaire
pour les fibres unimodales de classe B (CEI 60793-2-50:2008)
Ta slovenski standard je istoveten z: EN 60793-2-50:2008
ICS:
33.180.10 2SWLþQDYODNQDLQNDEOL Fibres and cables
SIST EN 60793-2-50:2009 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST EN 60793-2-50:2009

---------------------- Page: 2 ----------------------

SIST EN 60793-2-50:2009

EUROPEAN STANDARD
EN 60793-2-50

NORME EUROPÉENNE
November 2008
EUROPÄISCHE NORM

ICS 33.180.10 Supersedes EN 60793-2-50:2004


English version


Optical fibres -
Part 2-50: Product specifications -
Sectional specification for class B single-mode fibres
(IEC 60793-2-50:2008)


Fibres optiques -  Lichtwellenleiter -
Partie 2-50: Spécifications de produits - Teil 2-50: Produktspezifikationen -
Spécification intermédiaire Rahmenspezifikation
pour les fibres unimodales de classe B für Einmodenfasern der Kategorie B
(CEI 60793-2-50:2008) (IEC 60793-2-50:2008)




This European Standard was approved by CENELEC on 2008-10-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60793-2-50:2008 E

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SIST EN 60793-2-50:2009
EN 60793-2-50:2008 - 2 -
Foreword
The text of document 86A/1164/CDV, future edition 3 of IEC 60793-2-50, prepared by SC 86A, Fibres
and cables, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC parallel vote and was
approved by CENELEC as EN 60793-2-50 on 2008-10-01.
This European Standard supersedes EN 60793-2-50:2004 + corrigendum July 2004.
Compared to EN 60793-2-50:2004, this EN 60793-2-50:2008
– aligns the requirements with the relevant ITU-T Recommendations, including tightening the tolerances
of many parameters;
– provides a means for defining the requirements of sub-categories;
– now includes two sub-categories for B1.2 fibres;
– now includes three sub-categories for B4 fibres;
– replaces the traditional method of specifying chromatic dispersion coefficient by limiting curves vs.
wavelength for two of the sub-categories for B4 fibres;
– adds a new category, B5, which corresponds to the fibres defined in ITU-T Recommendation G.656;
– adds a new category, B6, which corresponds to the fibres defined in ITU-T Recommendation G.657;
– adds an informative annex that maps the nomenclature of the IEC fibre specifications to that of the
ITU-T fibre recommendations;
– adds a clause for definitions;
– adds a clause for abbreviations;
– removes the dates from the normative references.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2009-07-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2011-10-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60793-2-50:2008 was approved by CENELEC as a European
Standard without any modification.
__________

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SIST EN 60793-2-50:2009
- 3 - EN 60793-2-50:2008
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year

1) 2)
IEC 60793-1-1 - Optical fibres - EN 60793-1-1 2008
Part 1-1: Measurement methods and test
procedures - General and guidance


1) 2)
IEC 60793-1-20 - Optical fibres - EN 60793-1-20 2002
Part 1-20: Measurement methods and test
procedures - Fibre geometry


1) 2)
IEC 60793-1-21 - Optical fibres - EN 60793-1-21 2002
Part 1-21: Measurement methods and test
procedures - Coating geometry


1) 2)
IEC 60793-1-22 - Optical fibres - EN 60793-1-22 2002
Part 1-22: Measurement methods and test
procedures - Length measurement


1) 2)
IEC 60793-1-30 - Optical fibres - EN 60793-1-30 2002
Part 1-30: Measurement methods and test
procedures - Fibre proof test


1) 2)
IEC 60793-1-31 - Optical fibres - EN 60793-1-31 2002
Part 1-31: Measurement methods and test
procedures - Tensile strength


1) 2)
IEC 60793-1-32 - Optical fibres - EN 60793-1-32 2003
(mod) Part 1-32: Measurement methods and test
procedures - Coating strippability


1) 2)
IEC 60793-1-33 - Optical fibres - EN 60793-1-33 2002
Part 1-33: Measurement methods and test
procedures - Stress corrosion susceptibility


1) 2)
IEC 60793-1-34 - Optical fibres - EN 60793-1-34 2006
Part 1-34: Measurement methods and test
procedures - Fibre curl


1) 2)
IEC 60793-1-40 - Optical fibres - EN 60793-1-40 2003
(mod) Part 1-40: Measurement methods and test
procedures - Attenuation


1) 2)
IEC 60793-1-42 - Optical fibres - EN 60793-1-42 2007
Part 1-42: Measurement methods and test
procedures - Chromatic dispersion


1) 2)
IEC 60793-1-44 - Optical fibres - EN 60793-1-44 2002
Part 1-44: Measurement methods and test
procedures - Cut-off wavelength



1)
Undated reference.
2)
Valid edition at date of issue.

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SIST EN 60793-2-50:2009
EN 60793-2-50:2008 - 4 -
Publication Year Title EN/HD Year

1) 2)
IEC 60793-1-45 - Optical fibres - EN 60793-1-45 2003
(mod) Part 1-45: Measurement methods and test + corr. April 2004
procedures - Mode field diameter


1) 2)
IEC 60793-1-46 - Optical fibres - EN 60793-1-46 2002
Part 1-46: Measurement methods and test
procedures - Monitoring of changes in optical
transmittance


1) 2)
IEC 60793-1-47 - Optical fibres - EN 60793-1-47 2007
Part 1-47: Measurement methods and test
procedures - Macrobending loss


1) 2)
IEC 60793-1-48 - Optical fibres - EN 60793-1-48 2007
Part 1-48: Measurement methods and test
procedures - Polarization mode dispersion


1) 2)
IEC 60793-1-50 - Optical fibres - EN 60793-1-50 2002
Part 1-50: Measurement methods and test
procedures - Damp heat (steady state)


1) 2)
IEC 60793-1-51 - Optical fibres - EN 60793-1-51 2002
Part 1-51: Measurement methods and test
procedures - Dry heat


1) 2)
IEC 60793-1-52 - Optical fibres - EN 60793-1-52 2002
Part 1-52: Measurement methods and test
procedures - Change of temperature


1) 2)
IEC 60793-1-53 - Optical fibres - EN 60793-1-53 2002
Part 1-53: Measurement methods and test
procedures - Water immersion


1) 2)
IEC 60793-2 - Optical fibres - EN 60793-2 2008
Part 2: Product specifications - General


1) 2)
IEC 60794-2 - Optical fibre cables - EN 60794-2 2003
Part 2: Indoor cables - Sectional specification

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SIST EN 60793-2-50:2009
IEC 60793-2-50
Edition 3.0 2008-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


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
PRICE CODE
INTERNATIONALE
W
CODE PRIX
ICS 33.180.10 ISBN 2-8318-9824-2

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SIST EN 60793-2-50:2009
– 2 – 60793-2-50 © IEC:2008
CONTENTS
FOREWORD.4
1 Scope.6
2 Normative references .6
3 Terms and definitions .7
4 Abbreviations and symbols .7
5 Specifications .8
5.1 General .8
5.2 Dimensional requirements .8
5.3 Mechanical requirements.9
5.4 Transmission requirements .10
5.5 Environmental requirements .11
5.5.1 Optical environmental requirements.12
5.5.2 Mechanical environmental requirements .12
Annex A (normative) Family specification for B1.1 single-mode fibres.14
Annex B (normative) Family specification for B1.2 single-mode fibres.16
Annex C (normative) Family specification for B1.3 single-mode fibres.18
Annex D (normative) Family specification for B2 single-mode fibres.21
Annex E (normative) Family specification for B4 single-mode fibres.24
Annex F (normative) Family specification for B5 single-mode fibres .27
Annex G (normative) Family specification for B6 single-mode fibres .30
Annex H (informative) System design information for B4 single-mode fibres .33
Annex I (informative) Map from IEC nomenclature to ITU-T recommendations .36
Bibliography.37

Figure H.1 – B4_d chromatic dispersion coefficient limits.34
Figure H.2 – B4_e chromatic dispersion coefficient limits.35

Table 1 – Dimensional attributes and measurement methods.8
Table 2 – Requirements common to class B fibres.9
Table 3 – Mechanical attributes and test methods.9
Table 4 – Requirements common to class B fibres.10
Table 5 – Transmission attributes and measurement methods .10
Table 6 – Requirements common to class B fibres.11
Table 7 – Additional attributes required in the family specifications.11
Table 8 – Environmental exposure tests .11
Table 9 – Attributes measured .11
Table 10 – Change in attenuation for environmental tests.12
Table 11 – Coating strip force for environmental tests.12
Table 12 – Tensile strength for environmental tests .12
Table 13 – Stress corrosion susceptibility for environmental tests.13
Table A.1 – Dimensional requirements specific to B1.1 fibres .14
Table A.2 – Mechanical requirements specific to B1.1 fibres.14

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SIST EN 60793-2-50:2009
60793-2-50 © IEC:2008 – 3 –
Table A.3 – Transmission requirements specific to B1.1 fibres.15
Table B.1 – Dimensional requirements specific to B1.2 fibres .16
Table B.2 – Mechanical requirements specific to B1.2 fibres.17
Table B.3 – Transmission requirements specific to B1.2 fibres.17
Table C.1 – Dimensional requirements specific to B1.3 fibres .18
Table C.2 – Mechanical requirements specific to B1.3 fibres.19
Table C.3 – Transmission requirements specific to B1.3 fibres .19
Table D.1 – Dimensional requirements specific to B2 fibres .21
Table D.2 – Mechanical requirements specific to B2 fibres.22
Table D.3 – Transmission requirements specific to B2 fibres .22
Table E.1 – Dimensional requirements specific to B4 fibres .24
Table E.2 – Mechanical requirements specific to B4 fibres.25
Table E.3 – Transmission requirements specific to B4 fibres.25
Table F.1 − Dimensional requirements specific to B5 fibres .27
Table F.2 − Mechanical requirements specific to B5 fibres .28
Table F.3 − Transmission requirements specific to B5 fibres.28
Table G.1 − Dimensional requirements specific to B6 fibres.30
Table G.2 − Mechanical requirements specific to B6 fibres .31
Table G.3 – Transmission requirements specific to B6 fibres .32
Table H.1 – Examples for λ = 1 530 nm and λ = 1 565 nm .33
min max
Table I.1 – Map of IEC to ITU .36

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SIST EN 60793-2-50:2009
– 4 – 60793-2-50 © IEC:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

OPTICAL FIBRES –

Part 2-50: Product specifications –
Sectional specification for class B single-mode 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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60793-2-50 has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee 86: Fibre optics.
This third edition cancels and replaces the second edition published in 2004 and constitutes a
technical revision which:
• aligns the requirements with the relevant ITU-T Recommendations, including tightening
the tolerances of many parameters;
• provides a means for defining the requirements of sub-categories;
• for B1.2 fibres now includes two sub-categories;
• for B4 fibres now includes three sub-categories ;
• for B4 fibres, replaces the traditional method of specifying chromatic dispersion coefficient
by limiting curves vs. wavelength for two of the sub-categories;
• adds a new category, B5, which corresponds to the fibres defined in ITU-T
Recommendation G.656;

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SIST EN 60793-2-50:2009
60793-2-50 © IEC:2008 – 5 –
• adds a new category, B6, which corresponds to the fibres defined in ITU-T
Recommendation G.657;
• adds an informative annex that maps the nomenclature of the IEC fibre specifications to
that of the ITU-T fibre recommendations;
• adds a clause for definitions;
• adds a clause for abbreviations;
• removes the dates from the normative references.
The text of this standard is based on the following documents:
CDV Report on voting
86A/1164/CDV 86A/1170/RVC

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of 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 publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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SIST EN 60793-2-50:2009
– 6 – 60793-2-50 © IEC:2008
OPTICAL FIBRES –

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



1 Scope
This part of IEC 60793 is applicable to optical fibre types B1.1, B1.2, B1.3, and categories 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 3;
• particular requirements applicable to individual fibre types or specific applications, which
are defined in Annexes A to G.
• For some 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.
2 Normative references
The following referenced documents are indispensable for the application 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 60793-1-1, Optical fibres – Measurement methods and test procedures – Part 1-1:
General and guidance
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

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SIST EN 60793-2-50:2009
60793-2-50 © IEC:2008 – 7 –
IEC 60793-1-34, Optical fibres – Part 1-34: Measurement methods and test procedures –
Fibre curl
IEC 60793-1-40, Optical fibres – Part 1-40: Measurement methods and test procedures –
Attenuation
IEC 60793-1-42, Optical fibres – Part 1-42: Measurement methods and test procedures –
Chromatic dispersion
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 optical transmittance
IEC 60793-1-47, Optical fibres – Part 1-47: Measurement methods and test procedures –
Macrobending loss
IEC 60793-1-48 Optical fibres – Part 1-48: Measurement methods and test procedures –
Polarization mode dispersion
IEC 60793-1-50, Optical fibres – Part 1-50: Measurement methods and test procedures –
Damp heat (steady state)
IEC 60793-1-51, Optical fibres – Part 1-51: Measurement methods and test procedures – Dry
heat
IEC 60793-1-52, Optical fibres – Part 1-52: Measurement methods and test procedures –
Change of temperature
IEC 60793-1-53, Optical fibres – Part 1-53: Measurement methods and test procedures –
Water immersion
IEC 60793-2:, Optical fibres − Part 2: Product specifications – General
IEC 60794-2, Optical fibre cables – Part 2: Indoor cables – Sectional specification
3 Terms and definitions
For the purposes of this document, the terms and definitions of the specified attributes are
contained in the test methods. IEC 60793-1-1 provides general definitions for testing.
IEC 60793-2 provides general definitions for fibres.
4 Abbreviations and symbols
The following abbreviations and symbols are used in this document:
λ zero dispersion wavelength
0
F average strip force
avg
F peak strip force
peak
MFD mode field diameter

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SIST EN 60793-2-50:2009
– 8 – 60793-2-50 © IEC:2008
n stress corrosion parameter – dynamic
d
PMD polarization mode dispersion
PMD link design value
Q
5 Specifications
5.1 General
The fibre shall consist of a glass core and glass cladding in accordance with the construction
of optical fibre category B -single mode fibre- as given in IEC 60793-2.
The term “glass” usually refers to material consisting of non-metallic oxides. The composition
of some fibres may be all glass, or glass and glass/hard polymeric composites.
5.2 Dimensional requirements
Relevant dimensional attributes and measurement methods are given in Table 1.
Requirements common to all fibres in class B are in Table 2.
Table 1 – Dimensional attributes and measurement methods
Attributes Measurement methods
Cladding diameter IEC 60793-1-20
Cladding non-circularity IEC 60793-1-20
Core-cladding concentricity error IEC 60793-1-20
Primary coating diameter IEC 60793-1-21
Primary coating non-circularity IEC 60793-1-21
Primary coating-cladding concentricity error IEC 60793-1-21
Fibre length IEC 60793-1-22

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SIST EN 60793-2-50:2009
60793-2-50 © IEC:2008 – 9 –
Table 2 – Requirements common to class B fibres
Attributes Unit Limits
Cladding diameter
μm 125 ± 1
a
Cladding non-circularity % ≤2,0
a
Core concentricity error
μm ≤0,8
b
Primary coating diameter – uncoloured 235 to 255
μm
Primary coating diameter – coloured μm 235 to 265
Primary coating-cladding concentricity error
μm ≤12,5
c

Fibre length km
a
Some family specifications have tighter tolerances.
b
The above limits on primary coating diameter are most commonly used in telecommunications cables. There are
other applications, such as fibre for use within optical sub-systems, pigtails, or speciality applications such as for
submarines, which use other primary coating diameters, several of which are listed below.
Alternative nominal primary coating diameters and ranges (μm):
400 ± 40
700 ± 100
900 ± 100
c
Length requirements vary and should be agreed between supplier and customer.

5.3 Mechanical requirements
Relevant mechanical attributes and test methods are given in Table 3. The relationship of
these attributes and requirements to mechanical reliability are described in IEC/TR 62048
Requirements common to all fibres in class B are in Table 4.
Table 3 – Mechanical attributes and test methods
Attributes Test 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
Fibre curl IEC 60793-1-34

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SIST EN 60793-2-50:2009
– 10 – 60793-2-50 © IEC:2008
Table 4 – Requirements common to class B fibres
Attributes Unit Limits
a
Proof stress level GPa
≥0,69
b
Coating strip force (average) N 1,0 ≤ F ≤ 5,0
ave
b
Coating strip force (peak) N
1,0 ≤ F ≤ 8,9
peak
c
Fibre curl radius m
≥2
Tensile strength (median) for 0,5 m specimen length GPa ≥ 3,8
Stress corrosion susceptibility constant,
...