IEC 60793-2-10:2007
(Main)Optical fibres - Part 2-10: Product specifications - Sectional specification for category A1 multimode fibres
Optical fibres - Part 2-10: Product specifications - Sectional specification for category A1 multimode fibres
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. 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 applicabe to individual fibre types or specific applications, which are defined in the normative family specification annexes. 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.
Fibres optiques - Partie 2-10: Spécifications de produits - Spécification intermédiaire pour les fibres multimodales de catégorie A1
Applicables aux fibres optiques de type A1a, A1b et A1d. Ces fibres sont utilisées ou peuvent être intégrées dans des équipements destinés à 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 la CEI 60793-2; des exigences spécifiques communes aux fibres multimodales de catégorie A1, couvertes par la présente norme et qui sont données à l'Article 3; des exigences particulières applicables à des types particuliers de fibres ou à des applications spécifiques, qui sont définies dans les spécifications de familles figurant en annexe. Le texte temporairement inclus sur la méthode d'essai DMD a été supprimé, et des modifications ont été incluses sur les spécifications de la dispersion chromatique des types A1a.1 et A1d, et l'ouverture numérique du type A1a.1 a été limitée à une seule classe.
General Information
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Standards Content (Sample)
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
Reference number
Numéro de référence
IEC/CEI 60793-2-10:2007
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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
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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
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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6) All users should ensure that they have the latest edition of this publication.
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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 modes. Knowledge of the modal
structure of a fibre, as determined by IEC 60793-1-49, allows a lower limit to be placed on the
range of bandwidths which will be experienced when using a given fibre with laser
transmitters. By using lasers which couple primarily into modes with well bounded delays,
minimum effective modal bandwidth can be ensured. The test method IEC 61280-1-4 can be
used to measure the launch condition of laser transmitters into multimode fibre in terms of
encircled flux. Appropriately selected launch condition specifications can restrict the modes
used by the transmitters primarily to those with appropriately limited differential mode delays,
while allowing for low cost transceiver manufacturing.
The effective modal bandwidth (EMB) is the 3 dB bandwidth of the impulse response
produced from the modal delays of a particular fibre weighted by the mode power distribution
excited by a particular laser.
A minimum effective modal bandwidth-length product of 2 000 MHz·km for a A1a.2 fibre is
ensured by combining a transmitter meeting the specifications in Clause D.1 below with a
50 μm fibre meeting either the specifications in Clause D.2 or the specifications in Clause D.3
below.
D.1 Transmitter centre wavelength and encircled flux (EF) requirements
a) Transmitter centre wavelength (λ ): 840 nm ≤ λ ≤ 860 nm.
cw cw
b) Transmitter power distribution per IEC 61280-1-4 with the transmitter coupled into a type
A1a.2 (50 μm) fibre meeting the specifications of this document:
• encircled flux at radius 4,5 μm ≤ 30 %, and
• encircled flux at radius 19 μm ≥ 86 %.
D.2 Fibre differential mode delay (DMD) requirements
D.2.1 A1a.2 fibres shall meet one of the six templates in Table D.1, each of which includes
an inner and outer mask requirement, when measured per IEC 60793-1-49.
60793-2-10 © IEC:2007 – 21 –
Table D.1 – DMD templates
Template Inner mask DMD (ps/m) for Outer mask DMD (ps/m) for
number
R = 5 μm to R = 18 μm R = 0 μm to R = 23 μm
INNER OUTER INNER OUTER
1 ≤0,23 ≤0,70
≤0,24 ≤0,60
≤0,25 ≤0,50
4 ≤0,26 ≤0,40
≤0,27 ≤0,35
≤0,33 ≤0,33
The DMD requirements in D.2.1 are illustrated in Figure D.1. In this figure, the allowable DMD
(as measured by IEC 60793-1-49) is plotted versus the radial offset position of the single
mode probe. There is a trade-off between the tightness of the inner mask and the outer mask
to ensure a sufficient amount of the baud energy from a transmitter (meeting the launch
specifications) arrives within the required time period (defined by the baud rate of the
transmission system).
Outer mask Inner mask Outer mask Outer mask Inner mask Outer mask
Inner mask floats
inside outer mask
Inner mask floats
0,26 ps/m
0,40 ps/m 0,40 ps/m
0,70 ps/m
0,70 ps/m
inside outer mask
0,23 ps/m
0 5 10 15 20 0 5 10 15 20
18 23 18 23
Radial offset μm Radial offset μm
Outer mask Inner mask Outer mask Outer mask Inner mask Outer mask
0,24 ps/m
Inner mask floats
0,60 ps/m
0,27 ps/m
0,60 ps/m 0,35 ps/m 0,35 ps/m
inside outer mask
Inner mask floats
inside outer mask
0 5 10 15 18 2320
0 5 10 15 20 18 23
Radial offset μm
Radial offset μm
Outer mask Inner mask Outer mask Outer mask Inner mask Outer mask
Inner mask floats
0,33 ps/m
0,25 ps/m 0,50 ps/m
inside outer mask
0,50 ps/m
0 5 10 15 20 0 5 10 15 20
18 23 18 23
Radial offset μm Radial offset μm
IEC 780/07
Figure D.1 – DMD requirements
TEMPLATE 3 TEMPLATE 2 TEMPLATE 1
TEMPLATE 6 TEMPLATE 5 TEMPLATE 4
– 22 – 60793-2-10 © IEC:2007
The “floating” characteristic of the inner mask is also illustrated in Figure D.1. In this figure,
the inner mask (5 μm to 18 μm) may be positioned vertically (temporally) anywhere within the
outer mask (0 μm to 23 μm). The DMD is more tightly constrained in the inner mask to allow
for looser tolerances on the outer mask providing for improved ability to manufacture fibre
conforming with this requirement. In the case of the 0,33 ps/m mask, the requirement is the
same over the whole range from 0 μm to 23 μm creating a “flat” mask.
IEC 60793
...
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