IEC 60793-2-50:2008
(Main)Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres
Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres
IEC 60793-2-50:2008 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. The main technical changes of this edition include:
- aligns the requirements with the relevant ITU-T Recommendations, including tightening the tolerances of many parameters;
- adds a new category, B5, which corresponds to the fibres defined in ITU-T Recommendation G.656; and
- adds a new category, B6, which corresponds to the fibres defined in ITU-T Recommendation G.657.
Fibres optiques - Partie 2-50: Spécifications de produits - Spécification intermédiaire pour les fibres unimodales de classe B
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.
General Information
Relations
Standards Content (Sample)
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
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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
– 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
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
– 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
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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;
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.
– 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
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
F average strip force
avg
F peak strip force
peak
MFD mode field diameter
– 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
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
– 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, n -
≥ 18
d
a
The proof test value of 0,69 GPa equals about 1 % strain or about 8,8 N force. For the relation between these
different units, see Clause 4 of IEC/TR 62048.
b
Either average strip force or peak strip force, which are defined in the test procedure, may be specified with
agreement between supplier and customer.
c
Depending on splicing methods, a minimum of 4 m may be specified for fibre intended to be used in some cable
constructions – such as ribbon cable.
5.4 Transmission requirements
Relevant transmission attributes and measurement methods are given in Table 5.
Requirements common to all fibres in class B are indicated in Table 6.
Requirements that shall be specified in the family specifications are listed in Table 7.
Table 5 – Transmission attributes and measurement methods
Attributes Measurement methods
a
Attenuation coefficient IEC 60793-1-40
Chromatic dispersion IEC 60793-1-42
b
Cut-off wavelength IEC 60793-1-44
Mode field diameter IEC 60793-1-45
Change of optical transmission IEC 60793-1-46
Macrobending loss IEC 60793-1-47
Polarization mode dispersion IEC 60793-1-48
a
The attenuation coefficient at various wavelengths can be calculated using the measured values at a few
wavelengths using a spectral model such as that given in IEC 60793-1-40. For example, the attenuation at
1 480 nm can be calculated and used for design of systems that employ remote pumping of optical amplifiers.
When using Method C, OTDR, additional guidance information in IEC/TR 62316 should be taken into account
b
λ , cable cut-off wavelength, λ ,
There are three ways to measure cut-off wavelength: fibre cut-off wavelength,
c cc
and jumper cut-off wavelength, λ . The correlation of the measured values of λ λ and λ depends on the
cj c, cc cj
specific fibre and cable design and the test conditions. While in general λ < λ < λ a general quantitative
cc cj c
relationship cannot be easily established, the importance of ensuring single-mode transmission in the minimum
cable length between joints at the minimum operating wavelength is paramount. This may be performed by
recommending the maximum cable cut-off wavelength λ of a cabled single-mode fibre to be 1 260 nm, or for
cc
typical jumpers, by recommending a maximum jumper cable cut-off λ to be 1 250 nm, or for worst case length
cj
and bends by recommending a maximum fibre cut-off wavelength λ to be 1 250 nm.
c
The indicated maximum attenuation values apply to uncabled optical fibres; for the maximum cabled attenuation
values, reference is made to IEC 60794-2:2002, which can be used in conjunction with this standard.
60793-2-50 © IEC:2008 – 11 –
Table 6 – Requirements common to class B fibres
Attributes Unit Limits
a
Polarization mode dispersion (PMD) coefficient link ps/√km
design value (PMD )
Q
a
A maximum value of PMD on uncabled fibre shall be specified to satisfy the primary requirement of cable
Q
PMD, given in IEC 60794-3.
Table 7 – Additional attributes required in the family specifications
Attributes
Attenuation coefficient and wavelengths
Chromatic dispersion characteristics
Nominal mode field diameter (MFD) range and wavelength
Mode field diameter tolerance
Cable cut-off wavelength
Macrobending loss including: wavelength, mandrel size,
and number of turns
For B4 fibre, information for system design is given in Annex H.
5.5 Environmental requirements
Environmental exposure tests and measurement methods are documented in two forms:
• Relevant environmental attributes and test methods are given in Table 8.
• Measurements of a particular mechanical or transmission attributes that may change on
the application of the environment are listed in Table 9.
Table 8 – Environmental exposure tests
Attributes Test methods
Damp heat tests IEC 60793-1-50
Dry heat tests IEC 60793-1-51
Change of temperature tests IEC 60793-1-52
Water immersion tests IEC 60793-1-53
Table 9 – Attributes measured
Attribute Test methods
Change in optical transmission IEC 60793-1-46
Attenuation IEC 60793-1-40
Coating strip force IEC 60793-1-32
Tensile strength IEC 60793-1-31
Stress corrosion susceptibility IEC 60793-1-33
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.
– 12 – 60793-2-50 © IEC:2008
5.5.1 Optical environmental requirements
5.5.1.1 Attenuation
Change in attenuation from the initial value shall be less than the values in Table 10.
Attenuation shall be measured periodically during the entire exposure to each environment
and after removal.
Table 10 – Change in attenuation for environmental tests
Environment Wavelength Maximum attenuation increase
nm dB/km
Damp heat 1 550
≤0,05
Dry heat 1 550
≤0,05
Change of temperature 1 550 ≤0,05
Water Immersion 1 550
≤0,05
NOTE Attenuation changes at wavelengths lower than the test wavelength are smaller than
the attenuation change at the test wavelength.
NOTE Performance at 1625 nm is optional and should be agreed between customer and
supplier.
5.5.2 Mechanical environmental requirements
These tests are, in practice, the most severe requirements amongst the environments defined
in Table 8.
5.5.2.1 Coating strip force
The attributes given in Table 11 shall be verified following removal of the fibre from the
particular environment.
Table 11 – Coating strip force for environmental tests
Environment Average strip force Peak strip force
N N
Damp Heat
1,0 ≤ F ≤ 5,0 F ≤ 8,9
avg peak
Water Immersion
1,0 ≤ F ≤ 5,0 F ≤ 8,9
avg peak
5.5.2.2 Tensile strength
The attributes given in Table 12 shall be verified following removal of the fibre from the
environment indicated.
Table 12 – Tensile strength for environmental tests
Environment Median tensile 15 percentile of the tensile
strength (GPa),
strength distribution (GPa),
specimen length: 0,5 m
specimen length: 0,5 m
Damp heat
≥ 3,03 ≥ 2,76
NOTE These requirements do not apply to hermetically coated fibre.
60793-2-50 © IEC:2008 – 13 –
5.5.2.3 Stress corrosion susceptibility
The attribute given in Table 13 shall be verified following removal of the fibre from the
environment indicated.
Table 13 – 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.
– 14 – 60793-2-50 © IEC:2008
Annex A
(normative)
Family specification for B1.1 single-mode fibres
A.1 General
This dispersion unshifted single-mode fibre is optimized for use in the 1 310 nm region but
can be used in the 1 550 nm region. Depending on link length and bit rates, dispersion may
need accommodation in the 1 550 nm region.
The following clauses and tables contain particular requirements applicable to B1.1 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 .
A.2 Dimensional requirements
Table A.1 contains dimensional requirements specific to B1.1 fibres.
Table A.1 – Dimensional requirements specific to B1.1 fibres
Attributes Unit Limits Reference
Cladding diameter μm 125 ± 1 5.2
Cladding non-circularity % 5.2
≤1,0
Core concentricity error 5.2
μm ≤0,6
Primary coating diameter – uncoloured μm 235 to 255 5.2
Primary coating diameter – coloured 235 to 265 5.2
μm
Primary coating-cladding concentricity error 5.2
μm ≤12,5
Fibre length km [See 5.1] 5.2
A.3 Mechanical requirements
Table A.2 contains mechanical requirements specific to B1.1 fibres.
Table A.2 – Mechanical requirements specific to B1.1 fibres
Attributes Unit Limits Reference
SS
Proof stress level GPa 5.3
≥0,69
SS
Coating strip force (average) N 5.3
1,0 ≤ F ≤ 5,0
ave
SS
Coating strip force (peak) N 1,0 ≤ F ≤ 8,9 5.3
peak
a
Fibre curl radius m 5.3
≥2
Tensile strength (median) for 0,5 m specimen GPa 5.3
≥ 3,8
length
Stress corrosion susceptibility constant, n - 5.3
≥ 18
d
a
Depending on splicing methods, a minimum of 4 m may be specified for fibre intended to be used in some cable
constructions – such as ribbon cable.
60793-2-50 © IEC:2008 – 15 –
A.4 Transmission requirements
Table A.3 contains transmission requirements specific to B1.1 fibres.
Table A.3 – Transmission requirements specific to B1.1 fibres
Attributes Unit Limits Reference
Attenuation coefficient at 1 310 nm dB/km ≤0,40
Attenuation coefficient at 1 550 nm dB/km
≤0,30
Attenuation coefficient at 1 625 nm dB/km
≤0,40
Zero dispersion wavelength, λ nm 1 300 ≤ λ ≤ 1 324
0 0
Zero dispersion slope 2 ≤0,092
ps/nm ·km
a
Nominal MFD range at 1 310 nm μm 8,6 − 9,5
MFD tolerance
μm ±0,6
Cable cut-off wavelength nm
≤1 260
Macrobending loss at 1 625 nm, 100 turns on a 30 dB ≤0,1
mm radius mandrel
Polarization mode dispersion (PMD) coefficient ps/√km [See 5.4]
NOTE In the 1 550 nm region, the chromatic dispersion can be approximated as a linear function with wavelength.
A typical value for the chromatic dispersion at 1 550 is 17 ps/nm·km with a typical slope at 1 550 nm of
0,056 ps/nm ·km.
a
The value of the nominal MFD shall be agreed between supplier and customer from within the range given. The
tolerance shown is then applied around that nominal value.
A.5 Environmental requirements
The requirements of 5.5 shall be met.
– 16 – 60793-2-50 © IEC:2008
Annex B
(normative)
Family specification for B1.2 single-mode fibres
B.1 General
This dispersion unshifted single-mode fibre is optimized for low loss in the 1 550 nm region,
with cutoff wavelength shifted above the 1 310 nm region.
The following clauses and tables contain particular requirements applicable to B1.2 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 .
There are two sub-categories which are designated as with suffixes, “_b” and “_c”. These
sub-categories are distinguished by the chromatic dispersion coefficient and mode field
diameter attribute specifications.
B.2 Dimensional requirements
Table B.1 contains dimensional requirements specific to B1.2 fibres.
Table B.1 – Dimensional requirements specific to B1.2 fibres
Attributes Unit Limits Reference
Cladding diameter μm 125 ± 1 5.2
Cladding non-circularity % 5.2
≤2,0
Core concentricity error 5.2
μm ≤0,8
Primary coating diameter – uncoloured μm 235 to 255 5.2
Primary coating diameter – coloured μm 235 to 265 5.2
Primary coating-cladding concentricity error 5.2
μm ≤12,5
Fibre length km [See 5.2] 5.2
B.3 Mechanical requirements
Table B.2 contains mechanical requirements specific to B1.2 fibres.
60793-2-50 © IEC:2008 – 17 –
Table B.2 – Mechanical requirements specific to B1.2 fibres
Attributes Unit Limits Reference
SS
Proof stress level GPa 5.3
≥0,69
SS
Coating strip force (average) N 1,0 ≤ F ≤ 5,0 5.3
ave
SS
Coating strip force (peak) N 5.3
1,0 ≤ F ≤ 8,9
peak
a
Fibre curl radius m 5.3
≥2
Tensile strength (median) for 0,5 m specimen GPa ≥ 3,8 5.3
length
Stress corrosion susceptibility constant, n - ≥ 18 5.3
d
a
Depending on splicing methods, a minimum of 4 m may be specified for fibre intended to be used in some cable
constructions – such as ribbon cable.
B.4 Transmission requirements
Table B.3 contains transmission requirements specific to B1.2 fibres. There are two sub-
categories designated as “_b” and “_c”.
Table B.3 – Transmission requirements specific to B1.2 fibres
Attribute Unit _b Limit _c Limit Reference
Attenuation coefficient at 1 550 nm dB/km
≤0,22 ≤0,22
Attenuation coefficient at 1 625 nm dB/km <0,40 <0,40
Dispersion slope at 1 550 nm 2 <0,07 <0,07
ps/nm ·km
Dispersion coefficient at 1 550 nm
≤22 ≤20
ps/nm·km
a
Nominal MFD range at 1 550 nm 9,5 – 13,0 9,5 – 10,5
μm
MFD tolerance μm ±0,7 ±0,7
Cable cut-off wavelength nm ≤1 530 ≤1 530
Macrobending loss at 1 550 nm, 100 turns dB
≤0,50 ≤0,50
on a 30 mm radius mandrel
Polarization mode dispersion (PMD) coefficient [See 5.4] [See 5.4]
ps/√km
a
The value of the nominal MFD shall be agreed between supplier and customer from within the range given. The
tolerance shown is then applied around that nominal value.
B.5 Environmental requirements
The requirements of 5.5 shall be met.
– 18 – 60793-2-50 © IEC:2008
Annex C
(normative)
Family specification for B1.3 single-mode fibres
C.1 General
This dispersion unshifted single-mode fibre is intended to extend the range of possible
transmission signals, using 1 310 nm band power budgets, to portions of the band above
1 360 nm and below 1 530 nm. Chromatic dispersion in this band may impose requirements
either on the maximum link length or on the need for accommodation.
The following clauses and tables contain particular requirements applicable to B1.3 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 .
C.2 Dimensional requirements
Table C.1 contains dimensional requirements specific to B1.3 fibres.
Table C.1 – Dimensional requirements specific to B1.3 fibres
Attributes Unit Limits Reference
Cladding diameter 5.2
μm 125 ± 1
Cladding non-circularity % 5.2
≤1,0
Core concentricity error μm ≤0,6 5.2
Primary coating diameter – uncoloured 235 to 255 5.2
μm
Primary coating diameter – coloured 235 to 265 5.2
μm
Primary coating-cladding concentricity error μm ≤12,5 5.2
Fibre length km [See 5.2] 5.2
C.3 Mechanical requirements
Table C.2 contains mechanical requirements specific to B1.3 fibres.
60793-2-50 © IEC:2008 – 19 –
Table C.2 – Mechanical requirements specific to B1.3 fibres
Attributes Unit Limits Reference
SS
Proof stress level GPa 5.3
≥0,69
SS
Coating strip force (average) N 1,0 ≤ F ≤ 5,0 5.3
ave
SS
Coating strip force (peak) N 5.3
1,0 ≤ F ≤ 8,9
peak
a
Fibre curl radius m 5.3
≥2
Tensile strength (median) for 0,5 m specimen GPa ≥ 3,8 5.3
length
Stress corrosion susceptibility constant, n - ≥ 18 5.3
d
a
Depending on splicing methods, a minimum of 4 m may be specified for fibre intended to be used in some cable
constructions – such as ribbon cable.
C.4 Transmission requirements
Table C.3 contains transmission requirements specific to B1.3 fibres.
Table C.3 – Transmission requirements specific to B1.3 fibres
Attributes Unit Limits Reference
a
Attenuation coefficient from 1 310 nm to dB/km ≤0,40
1 625 nm
b
Attenuation coefficient at 1 383 nm ± 3 nm dB/km ≤0,40
Attenuation coefficient at 1 550 nm dB/km
≤0,30
nm
Zero dispersion wavelength, λ 1 300 ≤ λ ≤ 1 324
0 0
Zero dispersion slope
≤0,092
ps/nm ·km
c
Nominal MFD range at 1 310 nm
μm 8,6 − 9,5
MFD tolerance μm ±0,6
Cable cut-off wavelength nm
≤1 260
Macrobending loss at 1 625 nm, 100 turns on a dB
≤0,1
30 mm radius mandrel
Polarization mode dispersion (PMD) coefficient [See 5.4]
ps/√km
NOTE In the 1 550 nm region, the chromatic dispersion can be approximated as a linear function with wavelength.
A typical value for the chromatic dispersion at 1 550 nm is 17 ps/nm·km with a typical slope at 1 550 nm of
0,056 ps/nm ·km.
a
This wavelength region can be extended to 1 260 nm by adding 0,07 dB/km induced Rayleigh scattering loss to
the attenuation value at 1 310 nm.
b
The average attenuation coefficient after ageing according to the test outlined in the following paragraph shall
be less than the value specified for the range of 1 310 nm to 1 625 nm.
c
The value of the nominal MFD shall be agreed between supplier and customer from within the range given. The
tolerance shown is then applied around that nominal value.
C.5 Hydrogen ageing for B1.3
Select a fibre specimen at least 1 km long. After spooling the fibre to a test configuration that
minimises the effect of winding on attenuation at 1 310 nm, measure the attenuation
coefficient of the specimen at 1 240 nm and at 1 383 nm. This measurement gives the
baseline attenuation for the specimen. Expose the fibre to 0,01 atmospheres of hydrogen at
room temperature (reference test). For practical considerations, such as the availability of
equipment and testing time, higher H concentrations (e.g. 1 atm) can be used with proper
– 20 – 60793-2-50 © IEC:2008
care as mentioned in Note 4. During this exposure, monitor the attenuation coefficient of the
specimen at 1 240 nm. This wavelength is indicative of the molecular hydrogen present in the
specimen. Constructing the change in attenuation as the monitored results minus the baseline
value, continue exposure until the 1 240 nm attenuation changes by >0,03 dB/km. At this
time, the attenuation increase at 1 383 nm may be considered fully saturated, and the
specimen may be removed from the hydrogen atmosphere. After at least 14 days in the
normal laboratory environment, measure the attenuation coefficient of the fibre at 1 383 nm
using methods A, B or C of IEC 60793-1-40.
NOTE 1 This is a type test performed periodically to ensure that the manufacturing process reliably yields fibre
with acceptable ageing characteristics. For example, 10 fibre samples may be tested every 6 months.
NOTE 2 This test is not appropriate for hermetically coated fibre.
NOTE 3 For non-hermetic fibres, typical hydrogen exposure is from 4 days to 6 days.
NOTE 4 Hydrogen ageing should be performed in H concentrations that produce results representative of the
actual field conditions. Although increased H concentration reduces testing time, it tends to produce slightly
higher values of added loss at equivalent exposure time (see threshold for increases at 1 240 nm). The 0,01
atmosphere test is a compromise between impractically long testing times and unrealistically high added loss.
When testing with higher H concentration, the reduced testing time may require increased safety measures.
C.6 Environmental requirements
The requirements of 5.5 shall be met.
60793-2-50 © IEC:2008 – 21 –
Annex D
(normative)
Family specification for B2 single-mode fibres
D.1 General
This dispersion-shifted single-mode fibre is optimized for single-channel transmission in the
1 550 nm region. Multiple channels can only be transmitted if care is taken to avoid the
effects of four-
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