EN 60793-2-10:2007

SLOVENSKI STANDARD
01-februar-2008
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SIST EN 60793-2-10:2006
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Optical fibres - Part 2-10: Product specifications - Sectional specification for category A1
multimode fibres (IEC 60793-2-10:2007)
Lichtwellenleiter - Teil 2-10: Produktspezifikationen - Rahmenspezifikation für
Mehrmodenfasern der Kategorie A1 (IEC 60793-2-10:2007)
Fibres optiques - Partie 2-10: Spécification de produits - Spécification intermédiaire pour
les fibres multimodales de catégorie A1 (IEC 60793-2-10:2007)
Ta slovenski standard je istoveten z: EN 60793-2-10:2007
ICS:
33.180.10 2SWLþQDYODNQDLQNDEOL Fibres and cables
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 60793-2-10
NORME EUROPÉENNE
November 2007
EUROPÄISCHE NORM
ICS 33.180.10 Supersedes EN 60793-2-10:2004

English version
Optical fibres -
Part 2-10: Product specifications -
Sectional specification for category A1 multimode fibres
(IEC 60793-2-10:2007)
Fibres optiques -  Lichtwellenleiter -
Partie 2-10: Spécification de produits - Teil 2-10: Produktspezifikationen -
Spécification intermédiaire pour les fibres
Rahmenspezifikation
multimodales de catégorie A1 für Mehrmodenfasern der Kategorie A1
(CEI 60793-2-10:2007) (IEC 60793-2-10:2007)

This European Standard was approved by CENELEC on 2007-09-01. 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

© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60793-2-10:2007 E
Foreword
The text of document 86A/1046/CDV, future edition 3 of IEC 60793-2-10, prepared by SC 86A, Fibres
and cables, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC parallel Unique Acceptance
Procedure and was approved by CENELEC as EN 60793-2-10 on 2007-09-01.
This European Standard supersedes EN 60793-2-10:2004.
Temporarily included text of the DMD test method has been removed and modifications have been
included on the A1a.1 and A1d chromatic dispersion specifications, and A1a.1 numerical aperture has
been limited to one class only.
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) 2008-06-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-09-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60793-2-10:2007 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 60794-2 NOTE Harmonized as EN 60794-2:2003 (not modified).

__________
– 3 – EN 60793-2-10:2007
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

IEC 60793-1-1 2002 Optical fibres - EN 60793-1-1 2003
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)
Undated reference.
2)
Valid edition at date of issue.

Publication Year Title EN/HD Year
1) 2)
IEC 60793-1-41 – Optical fibres - EN 60793-1-41 2003
Part 1-41: Measurement methods and test
procedures - Bandwidth
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 60793-1-43 – Optical fibres - EN 60793-1-43 2002
Part 1-43: Measurement methods and test
procedures - Numerical aperture

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 60793-1-49 – Optical fibres - EN 60793-1-49 2006
Part 1-49: Measurement methods and test
procedures - Differential mode delay

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
IEC 60793-2 2003 Optical fibres - EN 60793-2 2004
Part 2: Product specifications - General

1) 2)
IEC 60794-1-1 – Optical fibre cables - EN 60794-1-1 2002
Part 1-1: Generic specification - General

1) 2)
IEC 61280-1-4 – Fibre optic communication subsystem test EN 61280-1-4 2003
procedures -
Part 1-4: General communication
subsystems - Collection and reduction of
two-dimensional nearfield data for multimode
fibre laser transmitters
1)
IEC/TR 62048 – Optical fibres - Reliability - Power law theory – –

INTERNATIONAL IEC
STANDARD
CEI
60793-2-10
NORME
Third edition
INTERNATIONALE
Troisième édition
2007-06
Optical fibres –
Part 2-10:
Product specifications –
Sectional specification for
category A1 multimode fibres
Fibres optiques –
Partie 2-10:
Spécifications de produits –
Spécification intermédiaire pour les fibres
multimodales de catégorie A1
PRICE CODE
V
CODE PRIX
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
Pour prix, voir catalogue en vigueur

– 2 – 60793-2-10 © IEC:2007
CONTENTS
FOREWORD.4

1 Scope.6
2 Normative references .6
3 Specifications .7
3.1 Dimensional requirements .7
3.2 Mechanical requirements.9
3.3 Transmission requirements .9
3.4 Environmental requirements .11
3.4.1 Mechanical environmental requirements (common to all fibres in
category A1).12
3.4.2 Transmission environmental requirements.12

Annex A (normative) Family specifications for A1a multimode fibres .14
Annex B (normative) Family specifications for A1b multimode fibres .16
Annex C (normative) Family specifications for A1d multimode fibres.18
Annex D (normative) Transmitter centre wavelength and encircled flux (EF), fibre
differential mode delay (DMD) and calculated effective modal bandwidth (EMBc)
requirements.20
Annex E (informative) Applications supported by A1 fibres.25
Annex F (informative) 1-Gigabit and 10-Gigabit Ethernet applications.29
Annex G (informative) Preliminary indications for items needing further study.31

Bibliography.33

Figure 1 – Relation between bandwidths at 850 nm and 1 300 nm .11
Figure D.1 – DMD requirements.21

Table 1 – Dimensional attributes and measurement methods.8
Table 2 – Requirements common to category A1 fibres.8
Table 3 – Additional attributes required in the family specifications.8
Table 4 – Mechanical attributes and measurement methods .9
Table 5 – Requirements common to category A1 fibres.9
Table 6 – Transmission attributes and measurement methods .9
Table 7 – Additional attributes required in family specifications.10
Table 8 – Environmental exposure tests .11
Table 9 – Attributes measured .11
Table 10 – Strip force for environmental tests .12
Table 11 – Tensile strength for environmental tests .12
Table 12 – Stress corrosion susceptibility for environmental tests.12
Table 13 – Change in attenuation for environmental tests.13
Table A.1 – Dimensional requirements specific to A1a fibres .14

60793-2-10 © IEC:2007 – 3 –
Table A.2 – Mechanical requirements specific to A1a fibres.14
Table A.3 – Transmission requirements specific to A1a fibres.15
Table B.1 – Dimensional requirements specific to A1b fibres .16
Table B.2 – Mechanical requirements specific to A1b fibres.16
Table B.3 – Transmission requirements specific to A1b fibres.17
Table C.1 – Dimensional requirements specific to A1d fibres .18
Table C.2 – Mechanical requirements specific to A1d fibres.18
Table C.3 – Transmission requirements specific to A1d fibres .19
Table D.1 – DMD templates .21
Table D.2 – DMD interval masks.22
Table D.3 – DMD weightings.24
Table E.1 – Some internationally standardised applications supported by A1a and A1b
fibres .25
Table E.2 – Typically used commercial bandwidth specifications for A1a and A1b
graded-index multimode fibres. .26
Table E.3 – Cross reference of fibre types and bandwidth cells for this standard and
ISO/IEC 11801.27
Table F.1 – Summary of 1 Gb/s and 10 Gb/s Ethernet requirements and capabilities .30

– 4 – 60793-2-10 © IEC:2007
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRES −
Part 2-10: Product specifications –
Sectional specification for category A1 multimode 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 60793-2-10 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, of which it
constitutes a technical revision. Temporarily included text of the DMD test method has been
removed and modifications have been included on the A1a.1 and A1d chromatic dispersion
specifications, and A1a.1 numerical aperture has been limited to one class only.
The text of this standard is based on the following documents:
CDV Report on voting
86A/1046/CDV 86A/1079/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.

60793-2-10 © IEC:2007 – 5 –
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.
– 6 – 60793-2-10 © IEC:2007
OPTICAL FIBRES −
Part 2-10: Product specifications –
Sectional specification for category A1 multimode fibres

1 Scope
This part of IEC 60793 is applicable to optical fibre types A1a, A1b, and A1d. These fibres are
used or can be incorporated in information transmission equipment and optical fibre cables.
Type A1a fibre is a 50/125 μm graded index fibre. Type A1a.1 applies to 50/125 μm fibre,
while A1a.2 applies to 850 nm laser-optimised 50/125 μm fibre. Type A1b applies to
62,5/125 μm graded index fibre and A1d applies to 100/140 μm graded index fibre.
Other applications include, but are not restricted to, the following: short reach, high bit-rate
systems in telephony, distribution and local networks carrying data, voice and/or video
services; on-premises intra-building and inter-building fibre installations including LANs,
PBXs, video, various multiplexing uses, outside telephone cable plant use, and miscellaneous
related uses.
Three types of requirements apply to these fibres:
– general requirements, as defined in IEC 60793-2;
– specific requirements common to the category A1 multimode 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 the normative family specification annexes.
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 60793-1-1:2002, Optical fibres – Part 1-1: Measurement methods and test procedures –
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
IEC 60793-1-34, Optical fibres – Part 1-34: Measurement methods and test procedures – Fibre
curl
60793-2-10 © IEC:2007 – 7 –
IEC 60793-1-40, Optical fibres – Part 1-40: Measurement methods and test procedures –
Attenuation
IEC 60793-1-41, Optical fibres – Part 1-41: Measurement methods and test procedures –
Bandwidth
IEC 60793-1-42, Optical fibres – Part 1-42: Measurement methods and test procedures –
Chromatic dispersion
IEC 60793-1-43, Optical fibres – Part 1-43: Measurement methods and test procedures –
Numerical aperture
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 60793-1-49, Optical fibres – Part 1-49: Measurement methods and test procedures –
Differential mode delay
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
− Part 2: Product specifications – General
IEC 60793-2:2003, Optical fibres
IEC 60794-1-1, Optical fibre cables − Part 1-1: Generic specification − General
IEC 61280-1-4, Fibre optic communication subsystem test procedures – Part 1-4: General
communication subsystems – Collection and reduction of two-dimensional nearfield data for
multimode fibre laser transmitters
IEC/TR 62048, Optical fibres – Reliability – Power law theory
3 Specifications
The fibre shall consist of a glass core with a graded index profile and a glass cladding in
accordance with 5.1 in IEC 60793-2.
The term “glass” usually refers to material consisting of non-metallic oxides.
3.1 Dimensional requirements
Dimensional attributes and measurement methods are given in Table 1.
Requirements common to all fibres in category A1 are indicated in Table 2.
Table 3 lists additional attributes that shall be specified by each family specification.

– 8 – 60793-2-10 © IEC:2007
Table 1 – Dimensional attributes and measurement methods
Attributes Measurement
methods
Cladding diameter IEC 60793-1-20
Core diameter IEC 60793-1-20
Cladding non-circularity IEC 60793-1-20
Core 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
Table 2 – Requirements common to category A1 fibres
Attributes Unit Limits
Core non-circularity %
≤6
b
Primary coating diameter – uncoloured μm 245 ± 10
b
Primary coating diameter – coloured μm 250 ± 15
Primary coating-cladding concentricity error
μm ≤12,5
a
Fibre length km
a
Length requirements vary and should be agreed between supplier and customer.
b
The above limits on primary coating diameter are most commonly used in
telecommunications cables. There are other applications, which use other primary
coating diameters, several of which are listed below.
Alternative nominal primary coating diameters and tolerance (μm):
400 ± 40
500 ± 50
700 ± 100
900 ± 100
Table 3 – Additional attributes required in the family specifications
Attributes
Cladding diameter
Cladding non-circularity
Core diameter
Core-cladding concentricity error

60793-2-10 © IEC:2007 – 9 –
3.2 Mechanical requirements
Mechanical attributes and measurement methods are given in Table 4.
Requirements common to all fibres in category A1 are in Table 5.
Table 4 – Mechanical attributes and measurement methods
Attributes Test methods
Proof test IEC 60793-1-30
Tensile strength IEC 60793-1-31
Primary coating strippability IEC 60793-1-32
Stress corrosion susceptibility IEC 60793-1-33
Fibre curl IEC 60793-1-34
Table 5 – Requirements common to category A1 fibres
Attributes Unit Limits
a
Proof stress level GPa ≥ 0,69
b
N
Strip force (average) 1,0 ≤ F ≤ 5,0
ave.strip
b
N
Strip force (peak) 1,0 ≤ F ≤ 8,9
peak.strip
Tensile strength (median) for 0,5 m
GPa ≥ 3,8
specimen length
Stress corrosion susceptibility constant n ≥ 18
d
a
The proof test value of 0,69 GPa equals about 1 % strain or about 8,8 N force, for
A1a and A1b fibres. For the relation between these different units, see 4.4 of
IEC/TR 62048.
b
Either average strip force or peak strip force, which are defined in the test
procedure, may be specified by agreement between supplier and customer.

3.3 Transmission requirements
Transmission attributes and measurement methods are given in Table 6.
Table 7 lists additional attributes that shall be specified by each family specification.
Table 6 – Transmission attributes and measurement methods
Attributes Measurement
methods
a
IEC 60793-1-40
Attenuation coefficient
a
Modal bandwidth IEC 60793-1-41
Numerical aperture IEC 60793-1-43
Chromatic dispersion IEC 60793-1-42
Change of optical transmission IEC 60793-1-46
Macrobending loss IEC 60793-1-47
Differential mode delay IEC 60793-1-49
a
When measuring attenuation and modal bandwidth, the appropriate launching
conditions should be applied. These may differ from those prescribed in the test
methods to which reference is made.
Specification compliance of chromatic dispersion can be assured by compliance to the
numerical aperture specification.

– 10 – 60793-2-10 © IEC:2007
Table 7 – Additional attributes required
in family specifications
Attributes
Attenuation coefficient
Modal bandwidth
Chromatic dispersion
Numerical aperture
Macrobending loss
For attenuation coefficient and modal bandwidth, the family specification contains ranges of
specifiable values instead of fixed limits. The actual values of the maximum attenuation
coefficient and minimum modal bandwidth, at both 850 nm and 1 300 nm (or just at one of
these wavelengths) are to be agreed between supplier and customer. For commercial
purposes, the modal bandwidth is linearly normalized to 1 km.
For guidance purposes on bandwidth, Table E.1 shows a number of internationally
standardised applications supported by A1 fibres, and Table E.2 gives a (limited) number of
frequently used commercial bandwidth specifications for A1a and A1b fibres.
The indicated maximum attenuation values apply to uncabled optical fibres; for the maximum
cabled attenuation values, reference is made to IEC 60794-1-1, which can be used in
conjunction with this standard.
Remarks on the specification of modal bandwidth:
Care should be taken in writing dual wavelength bandwidth specifications. For category A1
fibres, the bandwidth at 850 nm may be related to the bandwidth at 1 300 nm in a way shown
in Figure 1, depending on the refractive index parameter, g, (see 8.1 of IEC 60793-1-1) The
shaded region under the curve of Figure 1 can be defined as the dual window area. In this
area, regions X, Y, and Z are examples of where a fibre manufacturer may choose to optimise
the process. That is, centre the production at 850 nm, 1 300 nm, or between these two
wavelengths.
Due to this optimisation of the manufacturing process, there will be combinations of bandwidth
that are not possible. For example, it is practically impossible to produce a fibre with the
maximum of both indicated bandwidth ranges (e.g. 800 MHz·km/1 000 MHz·km for A1b
multimode fibres).
60793-2-10 © IEC:2007 – 11 –
X
Y
Z
Normalised bandwidth at 1 300 nm (MHz × km)
IEC  779/07
Figure 1 – Relation between bandwidths at 850 nm and 1 300 nm
3.4 Environmental requirements
Environmental exposure tests and measurement methods are documented in two forms:
– relevant environmental attributes and test procedures are given in Table 8;
– measurements of a particular mechanical or transmission attribute that may change on the
application of the environment are listed in Table 9.
Table 8 – Environmental exposure tests
Environmental exposure Test
Damp heat IEC 60793-1-50
Dry heat IEC 60793-1-51
Change of temperature IEC 60793-1-52
Water immersion IEC 60793-1-53

Table 9 – Attributes measured
Attribute Measurement method
Change in optical transmission IEC 60793-1-46
Attenuation IEC 60793-1-40
Strip force IEC 60793-1-32
Tensile strength IEC 60793-1-31
Stress corrosion susceptibility IEC 60793-1-33

Normalised bandwidth at 850 nm (MHz × km)

– 12 – 60793-2-10 © IEC:2007
These tests are normally conducted periodically as type-tests for a fibre and coating design.
Unless otherwise indicated, the recovery period allowed between the completion of the
environmental exposure and performing the attribute measurements shall be as stated in the
particular environmental test method.
3.4.1 Mechanical environmental requirements (common to all fibres in category A1)
These tests are, in practice, the most severe requirements amongst the environments defined
in Table 8.
Tables 10, 11, and 12 give the prescriptions for strip force, tensile strength and stress
corrosion susceptibility respectively.
3.4.1.1 Strip force
The following attributes shall be verified following removal of the fibre from the particular
environment.
Table 10 – Strip force for environmental tests
Environment Average strip force Peak strip force
N N
Damp heat 1,0 ≤ F ≤ 5,0 1,0 ≤ F ≤ 8,9
avg peak
Water immersion 1,0 ≤ F ≤ 5,0 1,0 ≤ F ≤ 8,9
avg peak
3.4.1.2 Tensile strength
The following attribute shall be verified following removal of the fibre from the environment.
Table 11 – Tensile strength for environmental tests
Environment Median tensile strength 15th percentile tensile strength
specimen length: 0,5 m Specimen length 0,5 m
GPa GPa
Damp heat
≥ 3,03 ≥ 2,76
NOTE These requirements do not apply to hermetically coated fibre.
3.4.1.3 Stress corrosion susceptibility
The following attribute shall be verified following removal of the fibre from the environment.
Table 12 – Stress corrosion susceptibility for environmental tests
Environment Stress corrosion susceptibility constant, n
d
Damp heat ≥ 18
NOTE This requirement does not apply to hermetically coated fibre.

3.4.2 Transmission environmental requirements
Change in attenuation from the initial value shall be less than the values in Table 13.
Attenuation shall be measured periodically during the entire exposure to each environment
and after removal.
60793-2-10 © IEC:2007 – 13 –
Table 13 – Change in attenuation for environmental tests
Wavelength Attenuation increase
Environment
nm dB/km
850 ≤ 0,20
Damp heat
1 300
≤ 0,20
≤ 0,20
Dry heat
1 300 ≤ 0,20
≤ 0,20
Change of temperature
1 300
≤ 0,20
≤ 0,20
Water immersion
1 300 ≤ 0,20
– 14 – 60793-2-10 © IEC:2007
Annex A
(normative)
Family specifications for A1a multimode fibres

A.0   Introduction
The following clauses and tables contain particular requirements applicable to A1a fibres.
Common requirements, repeated here for ease of reference from the sectional specification,
are noted by an entry in the “Reference” column. Relevant notes from the sectional specification
SS
“ ”
are not repeated but indicated with a superscript .
Type A1a fibre is a 50/125 μm graded index fibre. Two types of A1a fibre are specified. Type
A1a.1 (defined in the first edition of this standard as type A.1a) applies to 50/125 μm fibre,
while type A1a.2 applies to 850 nm laser-optimised 50/125 μm fibre. The dimensional,
mechanical and environmental requirements are common to both A1a.1 and A1a.2. The
differences in the transmission requirements are specified in Table A.3.
A.1 Dimensional requirements
Table A.1 contains dimensional requirements specific to A1a fibres.
Table A.1 – Dimensional requirements specific to A1a fibres
Attribute Unit Limits Reference
Cladding diameter μm 125 ± 2
Cladding non-circularity %
≤2
Core diameter
μm 50 ± 3
Core-cladding concentricity error μm ≤3
Core non-circularity % 3.1
≤6
Primary coating diameter – uncoloured 3.1
μm 245 ± 10
Primary coating diameter – coloured μm 250 ± 15 3.1
Primary coating-cladding concentricity error 3.1
μm ≤12,5
Length km [see 3.1] 3.1
A.2 Mechanical requirements
Table A.2 contains the mechanical requirements specific to A1a fibres.
Table A.2 – Mechanical requirements specific to A1a fibres
Attribute Unit Limits Reference

Proof stress level GPa SS 3.2
≥0,69
SS
N 3.2
Strip force (average) 1,0 ≤ F ≤ 5,0
ave.strip
SS
N 3.2
Strip force (peak) 1,0 ≤ F ≤ 8,9
peak.strip
SS
“ ”
NOTE Relevant notes from the sectional specification are not repeated but indicated with a superscript .

60793-2-10 © IEC:2007 – 15 –
A.3 Transmission requirements
Table A.3 contains transmission requirements specific to A1a fibres.
Table A.3 – Transmission requirements specific to A1a fibres
Attribute Unit Limits Reference
Fibre subtype A1a.1 A1a.2
a
Maximum attenuation coefficient at 850 nm dB/km 2,4 – 3,5 2,5
a
Maximum attenuation coefficient at 1 300 nm dB/km 0,8
0,7 – 1,5
a
Minimum modal bandwidth-length product for MHz·km 200 – 800 1 500
overfilled launch at 850 nm
a
Minimum modal bandwidth-length product for MHz·km 200 – 1 200 500
overfilled launch at 1 300 nm
b
Minimum effective modal bandwidth-length MHz·km Not specified 2 000
product at 850 nm
Annex D
Ensured by either and
Annex G
Differential mode delay at 850 nm ps/m Not specified Meet clauses
D.1 and D.2 of
Annex D
Or
Calculated effective modal bandwidth at Not specified

850 nm Meet Clauses
D.1 and D.3 of
Annex D
Numerical aperture Unit less 0,20 ± 0,015 0,20 ± 0,015
Maximum macrobending loss dB 0,5 0,5
100 turns on mandrel diameter of 75 mm
c
at wavelengths 850 nm and 1300 nm
d
Zero dispersion wavelength, λ nm 1 295 ≤ λ ≤ 1 340
0 0
Zero dispersion slope, S ps/nm ·km
d
≤ 0,105
– from 1 295 nm ≤ λ ≤ 1 310 nm
d
≤ 0,000 375 (1 590 - λ )
– from 1 310 nm ≤ λ ≤ 1 340 nm
a
These values represent a range that may be specified.
b
This value is not measured, but is implicit. Fibre meeting either the requirements of Clause D.2 or the
requirements of Clause D.3 will provide this performance when used with transmitters meeting the requirements
of Clause D.1.
c
According to the wavelength-independent behaviour of macrobending loss for A1a fibre under the steady-state
launch conditions used in this test, testing at only one of these wavelengths may be sufficient to ensure
compliance to this specification.
d 2
The worst case chromatic dispersion coefficient at 850 nm (e.g. S = 0,093 75 ps/nm ·km at λ = 1 340 nm or
0 0
S = 0,101 25 ps/nm ·km at λ = 1 320 nm) is –104 ps/nm·km.
0 0
A.4 Environmental requirements
The requirements of 3.4 shall be met.

– 16 – 60793-2-10 © IEC:2007
Annex B
(normative)
Family specifications for A1b multimode fibres

B.0  Introduction
The following clauses and tables contain particular requirements applicable to A1b fibres.
Common requirements, repeated here for ease of reference from the sectional specification,
are noted by an entry in the “Reference” column. Relevant notes from the sectional
SS
” ”
specification are not repeated but indicated with a superscript .
Type A1b fibre is a 62,5/125 μm graded index fibre.
B.1 Dimensional requirements
Table B.1 contains dimensional requirements specific to A1b fibres.
Table B.1 – Dimensional requirements specific to A1b fibres
Attributes Unit Limits Reference
Cladding diameter
μm 125 ± 2
Cladding non-circularity % ≤ 2
Core diameter
μm 62,5 ± 3
Core-cladding concentricity error
μm ≤3
Core non-circularity % ≤6 3.1
Primary coating diameter – uncoloured 3.1
μm 245 ± 10
Primary coating diameter – coloured 3.1
μm 250 ± 15
Primary coating-cladding concentricity error μm ≤12,5 3.1
Length Km [see 3.1] 3.1
B.2 Mechanical requirements
Table B.2 contains the mechanical requirements specific to A1b fibres.
Table B.2 – Mechanical requirements specific to A1b fibres
Attributes Unit Limits Reference

SS
Proof stress level GPa 3.2
≥ 0,69
SS
N 1,0 ≤ F ≤ 5,0 3.2
Strip force (average)
ave.strip
SS
N 1,0 ≤ F ≤ 8,9 3.2
Strip force (peak)
peak.strip
SS
“ ”
NOTE Relevant notes from the sectional specification are not repeated but indicated with a superscript .

60793-2-10 © IEC:2007 – 17 –
B.3 Transmission requirements
Table B.3 contains transmission requirements specific to A1b fibres.
Table B.3 – Transmission requirements specific to A1b fibres
Attributes Unit Limits Reference
a
Maximum attenuation coefficient at 850 nm dB/km 2,8 − 3,5
a
dB/km
Maximum attenuation coefficient at 1 300 nm 0,7 − 1,5
a
MHz·km
Minimum modal bandwidth at 850 nm 100 − 800
a
Minimum modal bandwidth at 1 300 nm MHz·km 200 − 1 000
Numerical aperture Unit less
0,275 ± 0,015
Maximum macrobending loss dB 0,5
100 turns on mandrel diameter of 75 mm
b
at wavelengths 850 nm and 1300 nm
c
nm
Zero dispersion wavelength, λ 1 320 ≤ λ ≤ 1 365

0 0
Zero dispersion slope S
ps/nm ·km
c
≤ 0,11
− from 1 320 nm ≤ λ ≤ 1 348 nm
c
≤ 0,001 (1 458 – λ )
− from 1 348 nm ≤ λ ≤ 1 365 nm
a
The limit column forms a range of values that may be specified.
b
According to the wavelength-independent behaviour of macrobending loss for A1b fibre under the steady-state launch
conditions used in this test, testing at only one of these wavelengths may be sufficient to ensure compliance to this specification
c 2
The worst case chromatic dispersion coefficient at 850 nm (S = 0,11 ps/nm ·km at λ = 1348 nm) is
0 0
–125 ps/nm·km.
B.4 Environmental requirements
The requirements of 3.4 shall be met.

– 18 – 60793-2-10 © IEC:2007
Annex C
(normative)
Family specifications for A1d multimode fibres

C.0  Introduction
The following clauses and tables contain particular requirements for A1d fibres. Common
requirements, repeated here for ease of reference from the sectional specification, are noted
by an entry in the “Reference” column. Relevant notes from the sectional specification are not
SS
“ ”
repeated but indicated with a superscript .
Type A1d fibre is a 100/140 μm graded index fibre.
C.1 Dimensional requirements
Table C.1 contains dimensional requirements specific to A1d fibres.
Table C.1 – Dimensional requirements specific to A1d fibres
Attributes Unit Limits Reference
Cladding diameter μm 140 ± 4
Cladding non-circularity %
≤ 4
Core diameter
μm 100 ± 5
Core-cladding concentricity error μm ≤ 6
Core non-circularity % 3.1
≤ 6
Primary coating diameter – uncoloured 3.1
μm 245 ± 10
Primary coating diameter – coloured μm 250 ± 15 3.1
Primary coating-cladding concentricity error μm ≤ 12,5 3.1
Length km [see 3.1] 3.1
C.2 Mechanical requirements
Table C.2 contains the mechanical requirements specific to A1d fibres.
Table C.2 – Mechanical requirements specific to A1d fibres
Attributes Unit Limits Reference

SS
Proof stress level GPa 3.2
≥ 0,69
SS N 3.2
1,0 ≤ F ≤ 5,0
Strip force (average)
ave.strip
SS N 3.2
1,0 ≤ F ≤ 8,9
Strip force (peak)
peak.strip
SS
“ ”
NOTE  Relevant notes from the sectional specification are not repeated but indicated with a superscript .

60793-2-10 © IEC:2007 – 19 –
C.3 Transmission requirements
Table C.3 contains transmission requirements specific to A1d fibres.
Table C.3 – Transmission requirements specific to A1d fibres
Attributes Unit Limits Reference
a
Maximum attenuation coefficient at 850 nm dB/km 3,5 − 7,0
a
dB/km
Maximum attenuation coefficient at 1 300 nm 1,5 − 4,5
a
Minimum modal bandwidth at 850 nm 10 − 200
MHz·km
a
Minimum modal bandwidth at 1 300 nm 100 − 300
MHz·km
Numerical aperture Unit less
0,26 ± 0,03 or
0,29 ± 0,03
Maximum macrobending loss dB For further study
b
nm
Zero dispersion wavelength, λ 1 330 ≤ λ ≤ 1 385

0 0
Zero dispersion slope S
ps/nm ·km
b
≤ 0,105
− from 1 330 nm ≤ λ ≤ 1 365 nm
b
≤ 0,000 5 (1 575 – λ )
− from 1 365 nm ≤ λ ≤ 1 385 nm
a
The limit column forms a range of values that may be specified.
b 2
The worst case chromatic dispersion coefficient at 850 nm (S = 0,105 ps/nm ·km at λ = 1 365 nm) is
0 0
–126 ps/nm·km.
C.4 Environmental requirements
The requirements of 3.4 shall be met.

– 20 – 60793-2-10 © IEC:2007
Annex D
(normative)
Transmitter centre wavelength and encircled flux (EF),
fibre differential mode delay (DMD) and
calculated effective modal bandwidth (EMBc) requirements

D.0  Introduction
When a multimode fibre is used with laser transmitters, its bandwidth may vary widely,
depending on the details of the modal structure of the lasers, of the modal delay structure of
the fibre, and of the coupling between the laser and the fibre mod
...