IEC 60793-2-50:2015
(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 60793-2-50:2015 is applicable to optical fibre categories B1.1, B1.2, B1.3, B2, B4, B5 and B6. A map illustrating the connection of IEC designations to ITU-T designations is shown in Annex I. These fibres are used or can be incorporated in information transmission equipment and optical fibre cables. Three types of requirements apply to these fibres:
- general requirements, as defined in IEC 60793-2;
- specific requirements common to the class B single-mode fibres covered in this standard and which are given in Clause 5;
- particular requirements applicable to individual fibre categories or specific applications, which are defined in Annexes A to G. For some fibre categories (shown in the relevant family specifications), there are sub-categories that are distinguished on the basis of difference in transmission attribute specifications. The designations for these sub-categories are documented in the individual family specifications. This fifth edition cancels and replaces the fourth edition, published in 2012. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- aligns the requirements with the ITU-T Recommendations G.654 (2012-10) and G.657 (2012-10);
- adds a new sub-category B1.2_d;
- modifies B6 sub-categories in terms of attenuation and chromatic dispersion coefficient. Keywords: information transmission equipment, optical fibre cables
Fibres optiques - Partie 2-50: Spécifications de produits - Spécification intermédiaire pour les fibres unimodales de classe B
L'IEC 60793-2-50:2015 est applicable aux fibres optiques des catégories B1.1, B1.2, B1.3, B2, B4, B5 et B6. Un tableau illustrant la correspondance des désignations IEC avec les Recommandations de l'UIT-T figure à l'Annexe I. Ces fibres sont utilisées ou peuvent être intégrées dans des équipements pour la transmission de l'information et dans des câbles à fibres optiques. Trois types d'exigences s'appliquent à ces fibres:
- les exigences générales, qui sont définies dans l'IEC 60793-2;
- des exigences spécifiques communes aux fibres unimodales de classe B, couvertes par la présente norme, et qui sont données dans l'Article 5;
- des exigences particulières applicables à des catégories particulières de fibres ou à des applications données, qui sont définies dans les Annexes A à G. Pour certaines catégories de fibres (indiquées dans les spécifications de famille correspondantes), il existe des sous-catégories qui se distinguent les unes des autres par leurs différences de spécifications d'attributs de transmission. Les désignations pour ces sous-catégories sont documentées dans les spécifications de famille individuelles Cette cinquième édition annule et remplace la quatrième édition parue en 2012. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- alignement des exigences avec les Recommandations G.654 (2012-10) et G.657 (2012-10) de l'UIT-T;
- ajout d'une nouvelle sous-catégorie B1.2_d;
- modification des sous-catégories B6 en termes d'affaiblissement et de coefficient de dispersion chromatique. Mots clés: équipements pour la transmission de l'information, câbles à fibres optiques
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IEC 60793-2-50 ®
Edition 5.0 2015-11
INTERNATIONAL
STANDARD
colour
inside
Optical fibres –
Part 2-50: Product specifications – Sectional specification for class B
single-mode fibres
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IEC 60793-2-50 ®
Edition 5.0 2015-11
INTERNATIONAL
STANDARD
colour
inside
Optical fibres –
Part 2-50: Product specifications – Sectional specification for class B
single-mode fibres
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.10 ISBN 978-2-8322-3023-7
– 2 – IEC 60793-2-50:2015 © IEC 2015
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Abbreviations and symbols . 9
5 Specifications . 9
5.1 General . 9
5.2 Dimensional requirements . 9
5.3 Mechanical requirements . 10
5.4 Transmission requirements . 11
5.5 Environmental requirements . 12
5.5.1 General . 12
5.5.2 Optical environmental requirements – Attenuation . 13
5.5.3 Mechanical environmental requirements . 13
Annex A (normative) Family specification for category B1.1 single-mode fibres . 15
A.1 General . 15
A.2 Dimensional requirements . 15
A.3 Mechanical requirements . 15
A.4 Transmission requirements . 16
A.5 Environmental requirements . 16
Annex B (normative) Family specification for category B1.2 single-mode fibres . 17
B.1 General . 17
B.2 Dimensional requirements . 17
B.3 Mechanical requirements . 17
B.4 Transmission requirements . 18
B.5 Environmental requirements . 18
Annex C (normative) Family specification for category B1.3 single-mode fibres . 19
C.1 General . 19
C.2 Dimensional requirements . 19
C.3 Mechanical requirements . 19
C.4 Transmission requirements . 20
C.5 Hydrogen ageing for category B1.3 . 20
C.6 Environmental requirements . 21
Annex D (normative) Family specification for category B2 single-mode fibres . 22
D.1 General . 22
D.2 Dimensional requirements . 22
D.3 Mechanical requirements . 22
D.4 Transmission requirements . 23
D.4.1 General . 23
D.4.2 Chromatic dispersion coefficient requirement for sub-category B2_a
fibres . 23
D.4.3 Chromatic dispersion coefficient requirement for sub-category B2_b
fibres . 24
D.5 Environmental requirements . 24
Annex E (normative) Family specification for category B4 single-mode fibres . 25
E.1 General . 25
E.2 Dimensional requirements . 25
E.3 Mechanical requirements . 25
E.4 Transmission requirements . 26
E.4.1 General . 26
E.4.2 Chromatic dispersion coefficient limits for sub-category B4_c fibres . 26
E.4.3 Chromatic dispersion coefficient limits for sub-category B4_d fibres . 27
E.4.4 Chromatic dispersion coefficient limits for sub-category B4_e fibres . 27
E.5 Environmental requirements . 27
Annex F (normative) Family specification for category B5 single-mode fibres . 28
F.1 General . 28
F.2 Dimensional requirements . 28
F.3 Mechanical requirements . 28
F.4 Transmission requirements . 29
F.4.1 General . 29
F.4.2 Chromatic dispersion coefficient for category B5 fibres . 29
F.5 Environmental requirements . 30
Annex G (normative) Family specification for category B6 single-mode fibres . 31
G.1 General . 31
G.2 Dimensional requirements . 31
G.3 Mechanical requirements . 32
G.4 Transmission requirements . 32
G.5 Environmental requirements . 33
Annex H (informative) System design information for category B4 single-mode fibres . 34
H.1 General . 34
H.2 One standard deviation limits for sub-category B4_d fibres . 34
H.3 One standard deviation limits for sub-category B4_e fibres . 35
Annex I (informative) Map from IEC nomenclature to ITU-T recommendations . 36
Bibliography . 37
Figure H.1 – Sub-category B4_d chromatic dispersion coefficient limits . 35
Figure H.2 – Sub-category B4_e chromatic dispersion coefficient limits . 35
Table 1 – Dimensional attributes and measurement methods . 9
Table 2 – Dimensional requirements common to all category B fibres . 10
Table 3 – Mechanical attributes and test methods . 10
Table 4 – Mechanical requirements common to all class B fibres . 11
Table 5 – Transmission attributes and measurement methods . 11
Table 6 – Transmission, requirements common to all class B fibres . 12
Table 7 – Additional transmission attributes required in the family specifications . 12
Table 8 – Environmental exposure tests . 12
Table 9 – Attributes measured in environmental exposure tests . 12
Table 10 – Change in attenuation for environmental tests . 13
Table 11 – Coating strip force for environmental tests . 13
Table 12 – Tensile strength for environmental tests . 13
Table 13 – Stress corrosion susceptibility for environmental tests . 14
Table A.1 – Dimensional requirements specific to category B1.1 fibres . 15
– 4 – IEC 60793-2-50:2015 © IEC 2015
Table A.2 – Mechanical requirements specific to category B1.1 fibres . 15
Table A.3 – Transmission requirements specific to category B1.1 fibres . 16
Table B.1 – Dimensional requirements specific to category B1.2 fibres . 17
Table B.2 – Mechanical requirements specific to category B1.2 fibres . 18
Table B.3 – Transmission requirements specific to category B1.2 fibres . 18
Table C.1 – Dimensional requirements specific to category B1.3 fibres . 19
Table C.2 – Mechanical requirements specific to category B1.3 fibres . 19
Table C.3 – Transmission requirements specific to category B1.3 fibres . 20
Table D.1 – Dimensional requirements specific to category B2 fibres . 22
Table D.2 – Mechanical requirements specific to category B2 fibres . 23
Table D.3 – Transmission requirements specific to category B2 fibres . 23
Table E.1 – Dimensional requirements specific to category B4 fibres . 25
Table E.2 – Mechanical requirements specific to category B4 fibres . 26
Table E.3 – Transmission requirements specific to category B4 fibres . 26
Table F.1 – Dimensional requirements specific to category B5 fibres . 28
Table F.2 – Mechanical requirements specific to category B5 fibres . 29
Table F.3 – Transmission requirements specific to category B5 fibres . 29
Table G.1 – Dimensional requirements specific to category B6 fibres . 32
Table G.2 – Mechanical requirements specific to category B6 fibres . 32
Table G.3 – Transmission requirements specific to category B6 fibres . 33
Table H.1 – Examples for λ = 1 530 nm and λ = 1 565 nm . 34
min max
Table I.1 – Map of IEC to ITU . 36
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
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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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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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 fifth edition cancels and replaces the fourth edition, published in 2012. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) aligns the requirements with the ITU-T Recommendations G.654 (2012-10) and G.657
(2012-10);
b) adds a new sub-category B1.2_d;
c) modifies B6 sub-categories in terms of attenuation and chromatic dispersion coefficient.
– 6 – IEC 60793-2-50:2015 © IEC 2015
The text of this standard is based on the following documents:
CDV Report on voting
86A/1571/CDV 86A/1614/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 in 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 stability 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.
A bilingual version of this publication may be issued at a later date.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
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 categories B1.1, B1.2, B1.3, B2, B4, B5
and B6. A map illustrating the connection of IEC designations to ITU-T designations is shown
in Annex I. These fibres are used or can be incorporated in information transmission
equipment and optical fibre cables.
Three types of requirements apply to these fibres:
– general requirements, as defined in IEC 60793-2;
– specific requirements common to the class B single-mode fibres covered in this standard
and which are given in Clause 5;
– particular requirements applicable to individual fibre categories or specific applications,
which are defined in Annexes A to G.
For some fibre categories (shown in the relevant family specifications), there are sub-
categories that are distinguished on the basis of difference in transmission attribute
specifications. The designations for these sub-categories are documented in the individual
family specifications.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. 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 (all parts), Optical fibres – Measurement methods and test procedures
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
– 8 – IEC 60793-2-50:2015 © IEC 2015
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
IEC 60793-1-40:2001, 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) tests
IEC 60793-1-51, Optical fibres – Part 1-51: Measurement methods and test procedures – Dry
heat (steady state) tests
IEC 60793-1-52, Optical fibres – Part 1-52: Measurement methods and test procedures –
Change of temperature tests
IEC 60793-1-53, Optical fibres – Part 1-53: Measurement methods and test procedures –
Water immersion tests
IEC 60793-2, Optical fibres − Part 2: Product specifications – General
IEC 60794-3, Optical fibre cables – Part 3: Outdoor cables – Sectional specification
IEC TR 62316, Guidance for the interpretation of OTDR backscattering traces
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60793-2 and the
IEC 60793-1 series apply.
NOTE General definitions for fibres are provided in IEC 60793-2. The definitions of the specified attributes are
contained in the relevant test methods standard of the IEC 60793-1 series, while general definitions for testing are
provided in IEC 60793-1-1.
4 Abbreviations and symbols
For the purposes of this document, the following abbreviations and symbols apply:
λ zero dispersion wavelength
F average strip force
avg
F peak strip force
peak
MFD mode field diameter
n stress corrosion parameter – dynamic
d
PMD polarization mode dispersion
PMD 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 class 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 categories of class B single-mode fibres are given in Table 2.
Cladding diameter, cladding non-circularity, and core concentricity error shall be specified in
the family specifications
Table 1 – Dimensional attributes and measurement methods
Attribute Measurement method
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
– 10 – IEC 60793-2-50:2015 © IEC 2015
Table 2 – Dimensional requirements common to all category B fibres
Attribute Unit Limit
a
Primary coating diameter – uncoloured µm 235 to 255
a
Primary coating diameter – coloured 235 to 265
µm
Primary coating-cladding concentricity error
µm ≤ 12,5
b
Fibre length km
a
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 specialty applications
such as for submarines cables or for compact FTTH cables, which use other primary coating diameters,
several of which are listed below.
Alternative nominal primary coating diameters and ranges:
200 µm ± 10 µm (uncoloured; 190 µm to 220 µm coloured)
400 µm ± 40 µm
500 µm ± 30 µm
700 µm ± 100 µm
900 µm ± 100 µm
The primary coating cladding concentricity error should be limited to a maximum 10 µm for 200 µm.
Alternative coating diameters may impact fibre connectivity such as ribbons, multi-fibre connectors,
mechanical splices, and fusion splice protectors; they may also need adjustments to connectivity tools.
b
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
between some of these attributes and mechanical reliability are described in IEC TR 62048.
Requirements common to all categories of class B single-mode fibres are given in Table 4.
Table 3 – Mechanical attributes and test methods
Attribute Test method
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
Table 4 – Mechanical requirements common to all class B fibres
Attribute Unit Limit
a
Proof stress level GPa ≥ 0,69
b, c
Coating strip force (average) N 1,0 ≤ F ≤ 5,0
ave
b, c
Coating strip force (peak) N
1,0 ≤ F ≤ 8,9
peak
d
Fibre curl radius m
≥ 2
Tensile strength (median) for 0,5 m specimen length GPa ≥ 3,8
Stress corrosion susceptibility parameter, 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 IEC TR 62048:2014, 7.4.
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
In case of alternative nominal primary coating diameters (see Table 2), associated alternative coating strip
force values need to be agreed between supplier and customer.
d
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 categories of class B single-mode fibres are shown in Table 6.
Requirements that shall be specified in the family specifications are listed in Table 7.
Table 5 – Transmission attributes and measurement methods
Attribute Measurement method
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
NOTE The indicated maximum attenuation values apply to uncabled optical fibres; for the maximum cabled
attenuation values, reference is made to IEC 60794-2, which can be used in conjunction with this standard.
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 shall be taken
into account. As reported in IEC 60793-1-40, the spectral attenuation model, to date, has only been
demonstrated on B1 and B2 fibres
b
There are two ways to measure cut-off wavelength, leading to: fibre cut-off wavelength λ and to cable cut-
c
off wavelength λ , respectively. The correlation of the measured values of λ and λ depends on the
cc c cc
specific fibre and cable design and the test conditions. While in general λ < λ a general quantitative
cc 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
cc
1 260 nm or for worst case length and bends by recommending a maximum fibre cut-off wavelength λ to
c
be 1 250 nm.
– 12 – IEC 60793-2-50:2015 © IEC 2015
Table 6 – Transmission, requirements common to all class B fibres
Attribute Unit Limit
a
Polarization mode dispersion (PMD) coefficient link ps/√km
design value (PMD )
Q
a
A maximum value of PMD on uncabled fibre shall be agreed between supplier and customer to satisfy the
Q
primary requirement of cable PMD, given in IEC 60794-3.
Table 7 – Additional transmission attributes required in the family specifications
Attribute
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
Cladding diameter
Cladding non-circularity
Core concentricity error
For category B4 fibre, information for system design is given in Annex H.
5.5 Environmental requirements
5.5.1 General
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
Attribute Test method
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 in environmental exposure tests
Attribute Test method
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.
5.5.2 Optical environmental requirements – 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, 1 625 ≤ 0,05
Dry heat 1 550, 1 625
≤ 0,05
Change of temperature 1 550, 1 625
≤ 0,05
Water immersion 1 550, 1 625 ≤ 0,05
NOTE Attenuation changes at wavelengths lower than the test wavelength are smaller than the attenuation
change at the test wavelength.
5.5.3 Mechanical environmental requirements
5.5.3.1 General
These tests are, in practice, the most severe requirements amongst the environments defined
in Table 8.
5.5.3.2 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 1,0 ≤ F ≤ 8,9
avg peak
Water immersion
1,0 ≤ F ≤ 5,0 1,0 ≤ F ≤ 8,9
avg peak
In case of alternative nominal primary coating diameters (see Table 2), associated alternative coating strip force
values need to be agreed between supplier and customer.
5.5.3.3 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
Median tensile strength (GPa), 15 percentile of the tensile strength
Environment
specimen length: 0,5 m distribution (GPa), specimen length: 0,5 m
Damp heat
≥ 3,03 ≥ 2,76
NOTE These requirements do not apply to hermetically coated fibre. (A hermetic coating is a protective layer
that completely segregates the glass fibre from moisture, thereby ensuring a high level of stress corrosion
resistance. Typical hermetic coating is a carbon layer of several microns thickness applied on the glass
surface.)
– 14 – IEC 60793-2-50:2015 © IEC 2015
5.5.3.4 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 parameter, n
d
Damp heat
≥ 18
NOTE This requirement does not apply to hermetically coated fibre (see definition for hermetic coating in
Table 12).
Annex A
(normative)
Family specification for category 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 and 1 625 nm regions. Depending on link length and bit rates,
dispersion may need accommodation in the 1 550 nm and 1 625 nm regions.
The clauses and tables in Annex A contain particular requirements applicable to category
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
SS
“ ”
sectional specification are not repeated but indicated with a superscript .
A.2 Dimensional requirements
Table A.1 contains dimensional requirements specific to category B1.1 fibres.
Table A.1 – Dimensional requirements specific to category B1.1 fibres
Attribute Unit Limit Reference
Cladding diameter 5.2
µm 125 ± 1
Cladding non-circularity % 5.2
≤ 1,0
Core concentricity error µm ≤ 0,6 5.2
a
Primary coating diameter – uncoloured 235 to 255 5.2
µm
a
Primary coating diameter – coloured 235 to 265 5.2
µm
Primary coating-cladding concentricity error µm ≤ 12,5 5.2
Fibre length km See 5.1 5.2
a
Alternative nominal primary coating diameters may be used (see Table 2), to be agreed between supplier
and customer.
A.3 Mechanical requirements
Table A.2 contains mechanical requirements specific to category B1.1 fibres.
Table A.2 – Mechanical requirements specific to category B1.1 fibres
Attribute Unit Limit 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 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 ≥ 3,8 5.3
length
Stress corrosion susceptibility parameter, 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.
– 16 – IEC 60793-2-50:2015 © IEC 2015
A.4 Transmission requirements
Table A.3 contains transmission requirements specific to category B1.1 fibres.
Table A.3 – Transmission requirements specific to category B1.1 fibres
Attribute Unit Limit 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 to 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 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 nm 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.
Annex B
(normative)
Family specification for category 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 clauses and tables in Annex B contain particular requirements applicable to category
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
SS
” ”
sectional specification are not repeated but indicated with a superscript .
There are three sub-categories which are designated as with suffixes, “_b”, “_c” and “_d”.
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 category B1.2 fibres.
Table B.1 – Dimensional requirements specific to category B1.2 fibres
Attribute Unit Limit Reference
Cladding diameter µm 125 ± 1 5.2
Cladding non-circularity % 5.2
≤ 2,0
Core concentricity error 5.2
µm ≤ 0,8
a
Primary coating diameter – uncoloured µm 235 to 255 5.2
a
Primary coating diameter – coloured 235 to 265 5.2
µm
Primary coating-cladding concentricity error 5.2
µm ≤ 12,5
Fibre length km See 5.2 5.2
a
Alternative nominal primary coating diameters may be used, (see Table 2), to be agreed between supplier
and customer.
B.3 Mechanical requirements
Table B.2 contains mechanical requirements specific to category B1.2 fibres.
– 18 – IEC 60793-2-50:2015 © IEC 2015
Table B.2 – Mechanical requirements specific to category B1.2 fibres
Attribute Unit Limit Reference
SS
Proof stress level GPa ≥ 0,69 5.3
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 ≥ 2 5.3
Tensile strength (median) for 0,5 m specimen GPa ≥ 3,8 5.3
length
Stress corrosion susceptibility parameter, 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 category B1.2 fibres. There are
three sub-categories designated as “_b”, “_c” and “_d”.
Table B.3 – Transmission requirements specific to category B1.2 fibres
Attribute Unit _b Limit _c Limit _d Limit Reference
Attenuation coefficient at 1 550 dB/km ≤ 0,22 ≤ 0,22 ≤ 0,20
nm
Attenuation coefficient at 1 625 dB/km ≤ 0,40 ≤ 0,40 ≤ 0,40
nm
Dispersion slope at 1 550 nm 2 ≤ 0,07 ≤ 0,07 ≤ 0,07
ps/nm ⋅ km
D
...
IEC 60793-2-50 ®
Edition 5.0 2015-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical fibres –
Part 2-50: Product specifications – Sectional specification for class B single-
mode fibres
Fibres optiques –
Partie 2-50: Spécifications de produits – Spécification intermédiaire pour les
fibres unimodales de classe B
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IEC 60793-2-50 ®
Edition 5.0 2015-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical fibres –
Part 2-50: Product specifications – Sectional specification for class B single-
mode fibres
Fibres optiques –
Partie 2-50: Spécifications de produits – Spécification intermédiaire pour les
fibres unimodales de classe B
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.10 ISBN 978-2-8322-3739-7
– 2 – IEC 60793-2-50:2015 © IEC 2015
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Abbreviations and symbols . 8
5 Specifications . 9
5.1 General . 9
5.2 Dimensional requirements . 9
5.3 Mechanical requirements . 10
5.4 Transmission requirements . 10
5.5 Environmental requirements . 11
5.5.1 General . 11
5.5.2 Optical environmental requirements – Attenuation . 12
5.5.3 Mechanical environmental requirements . 12
Annex A (normative) Family specification for category B1.1 single-mode fibres . 14
A.1 General . 14
A.2 Dimensional requirements . 14
A.3 Mechanical requirements . 14
A.4 Transmission requirements . 14
A.5 Environmental requirements . 15
Annex B (normative) Family specification for category B1.2 single-mode fibres . 16
B.1 General . 16
B.2 Dimensional requirements . 16
B.3 Mechanical requirements . 16
B.4 Transmission requirements . 17
B.5 Environmental requirements . 17
Annex C (normative) Family specification for category B1.3 single-mode fibres . 18
C.1 General . 18
C.2 Dimensional requirements . 18
C.3 Mechanical requirements . 18
C.4 Transmission requirements . 18
C.5 Hydrogen ageing for category B1.3 . 19
C.6 Environmental requirements . 20
Annex D (normative) Family specification for category B2 single-mode fibres . 21
D.1 General . 21
D.2 Dimensional requirements . 21
D.3 Mechanical requirements . 21
D.4 Transmission requirements . 22
D.4.1 General . 22
D.4.2 Chromatic dispersion coefficient requirement for sub-category B2_a
fibres . 22
D.4.3 Chromatic dispersion coefficient requirement for sub-category B2_b
fibres . 22
D.5 Environmental requirements . 23
Annex E (normative) Family specification for category B4 single-mode fibres . 24
E.1 General . 24
E.2 Dimensional requirements . 24
E.3 Mechanical requirements . 24
E.4 Transmission requirements . 25
E.4.1 General . 25
E.4.2 Chromatic dispersion coefficient limits for sub-category B4_c fibres . 25
E.4.3 Chromatic dispersion coefficient limits for sub-category B4_d fibres . 26
E.4.4 Chromatic dispersion coefficient limits for sub-category B4_e fibres . 26
E.5 Environmental requirements . 26
Annex F (normative) Family specification for category B5 single-mode fibres . 27
F.1 General . 27
F.2 Dimensional requirements . 27
F.3 Mechanical requirements . 27
F.4 Transmission requirements . 28
F.4.1 General . 28
F.4.2 Chromatic dispersion coefficient for category B5 fibres . 28
F.5 Environmental requirements . 28
Annex G (normative) Family specification for category B6 single-mode fibres . 29
G.1 General . 29
G.2 Dimensional requirements . 29
G.3 Mechanical requirements . 30
G.4 Transmission requirements . 30
G.5 Environmental requirements . 31
Annex H (informative) System design information for category B4 single-mode fibres . 32
H.1 General . 32
H.2 One standard deviation limits for sub-category B4_d fibres . 32
H.3 One standard deviation limits for sub-category B4_e fibres . 33
Annex I (informative) Map from IEC nomenclature to ITU-T recommendations . 34
Bibliography . 35
Figure H.1 – Sub-category B4_d chromatic dispersion coefficient limits . 33
Figure H.2 – Sub-category B4_e chromatic dispersion coefficient limits . 33
Table 1 – Dimensional attributes and measurement methods . 9
Table 2 – Dimensional requirements common to all category B fibres . 9
Table 3 – Mechanical attributes and test methods . 10
Table 4 – Mechanical requirements common to all class B fibres . 10
Table 5 – Transmission attributes and measurement methods . 10
Table 6 – Transmission, requirements common to all class B fibres . 11
Table 7 – Additional transmission attributes required in the family specifications . 11
Table 8 – Environmental exposure tests . 11
Table 9 – Attributes measured in environmental exposure tests . 12
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 . 13
Table 13 – Stress corrosion susceptibility for environmental tests . 13
Table A.1 – Dimensional requirements specific to category B1.1 fibres . 14
– 4 – IEC 60793-2-50:2015 © IEC 2015
Table A.2 – Mechanical requirements specific to category B1.1 fibres . 14
Table A.3 – Transmission requirements specific to category B1.1 fibres . 15
Table B.1 – Dimensional requirements specific to category B1.2 fibres . 16
Table B.2 – Mechanical requirements specific to category B1.2 fibres . 16
Table B.3 – Transmission requirements specific to category B1.2 fibres . 17
Table C.1 – Dimensional requirements specific to category B1.3 fibres . 18
Table C.2 – Mechanical requirements specific to category B1.3 fibres . 18
Table C.3 – Transmission requirements specific to category B1.3 fibres . 19
Table D.1 – Dimensional requirements specific to category B2 fibres . 21
Table D.2 – Mechanical requirements specific to category B2 fibres . 22
Table D.3 – Transmission requirements specific to category B2 fibres . 22
Table E.1 – Dimensional requirements specific to category B4 fibres . 24
Table E.2 – Mechanical requirements specific to category B4 fibres . 25
Table E.3 – Transmission requirements specific to category B4 fibres . 25
Table F.1 – Dimensional requirements specific to category B5 fibres . 27
Table F.2 – Mechanical requirements specific to category B5 fibres . 27
Table F.3 – Transmission requirements specific to category B5 fibres . 28
Table G.1 – Dimensional requirements specific to category B6 fibres . 30
Table G.2 – Mechanical requirements specific to category B6 fibres . 30
Table G.3 – Transmission requirements specific to category B6 fibres . 31
Table H.1 – Examples for λ = 1 530 nm and λ = 1 565 nm . 32
min max
Table I.1 – Map of IEC to ITU . 34
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
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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
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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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
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other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60793-2-50 has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee 86: Fibre optics.
This fifth edition cancels and replaces the fourth edition, published in 2012. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) aligns the requirements with the ITU-T Recommendations G.654 (2012-10) and G.657
(2012-10);
b) adds a new sub-category B1.2_d;
c) modifies B6 sub-categories in terms of attenuation and chromatic dispersion coefficient.
This bilingual version (2016-11) corresponds to the English version, published in 2015-11.
The text of this standard is based on the following documents:
– 6 – IEC 60793-2-50:2015 © IEC 2015
CDV Report on voting
86A/1571/CDV 86A/1614/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.
The French version of this standard has not been voted upon.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in 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 stability 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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
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 categories B1.1, B1.2, B1.3, B2, B4, B5
and B6. A map illustrating the connection of IEC designations to ITU-T designations is shown
in Annex I. These fibres are used or can be incorporated in information transmission
equipment and optical fibre cables.
Three types of requirements apply to these fibres:
– general requirements, as defined in IEC 60793-2;
– specific requirements common to the class B single-mode fibres covered in this standard
and which are given in Clause 5;
– particular requirements applicable to individual fibre categories or specific applications,
which are defined in Annexes A to G.
For some fibre categories (shown in the relevant family specifications), there are sub-
categories that are distinguished on the basis of difference in transmission attribute
specifications. The designations for these sub-categories are documented in the individual
family specifications.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. 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 (all parts), Optical fibres – Measurement methods and test procedures
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
– 8 – IEC 60793-2-50:2015 © IEC 2015
IEC 60793-1-34, Optical fibres – Part 1-34: Measurement methods and test procedures –
Fibre curl
IEC 60793-1-40:2001, 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) tests
IEC 60793-1-51, Optical fibres – Part 1-51: Measurement methods and test procedures – Dry
heat (steady state) tests
IEC 60793-1-52, Optical fibres – Part 1-52: Measurement methods and test procedures –
Change of temperature tests
IEC 60793-1-53, Optical fibres – Part 1-53: Measurement methods and test procedures –
Water immersion tests
IEC 60793-2, Optical fibres − Part 2: Product specifications – General
IEC 60794-3, Optical fibre cables – Part 3: Outdoor cables – Sectional specification
IEC TR 62316, Guidance for the interpretation of OTDR backscattering traces
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60793-2 and the
IEC 60793-1 series apply.
NOTE General definitions for fibres are provided in IEC 60793-2. The definitions of the specified attributes are
contained in the relevant test methods standard of the IEC 60793-1 series, while general definitions for testing are
provided in IEC 60793-1-1.
4 Abbreviations and symbols
For the purposes of this document, the following abbreviations and symbols apply:
λ zero dispersion wavelength
F average strip force
avg
F peak strip force
peak
MFD mode field diameter
n stress corrosion parameter – dynamic
d
PMD polarization mode dispersion
PMD 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 class 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 categories of class B single-mode fibres are given in Table 2.
Cladding diameter, cladding non-circularity, and core concentricity error shall be specified in
the family specifications
Table 1 – Dimensional attributes and measurement methods
Attribute Measurement method
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
Table 2 – Dimensional requirements common to all category B fibres
Attribute Unit Limit
a
Primary coating diameter – uncoloured
µm 235 to 255
a
Primary coating diameter – coloured 235 to 265
µm
Primary coating-cladding concentricity error µm ≤ 12,5
b
Fibre length km
a
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 specialty applications
such as for submarines cables or for compact FTTH cables, which use other primary coating diameters,
several of which are listed below.
Alternative nominal primary coating diameters and ranges:
200 µm ± 10 µm (uncoloured; 190 µm to 220 µm coloured)
400 µm ± 40 µm
500 µm ± 30 µm
700 µm ± 100 µm
900 µm ± 100 µm
The primary coating cladding concentricity error should be limited to a maximum 10 µm for 200 µm.
Alternative coating diameters may impact fibre connectivity such as ribbons, multi-fibre connectors,
mechanical splices, and fusion splice protectors; they may also need adjustments to connectivity tools.
b
Length requirements vary and should be agreed between supplier and customer.
– 10 – IEC 60793-2-50:2015 © IEC 2015
5.3 Mechanical requirements
Relevant mechanical attributes and test methods are given in Table 3. The relationship
between some of these attributes and mechanical reliability are described in IEC TR 62048.
Requirements common to all categories of class B single-mode fibres are given in Table 4.
Table 3 – Mechanical attributes and test methods
Attribute Test method
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
Table 4 – Mechanical requirements common to all class B fibres
Attribute Unit Limit
a
Proof stress level GPa
≥ 0,69
b, c
N
Coating strip force (average) 1,0 ≤ F ≤ 5,0
ave
b, c
N
Coating strip force (peak) 1,0 ≤ F ≤ 8,9
peak
d
Fibre curl radius m
≥ 2
Tensile strength (median) for 0,5 m specimen length GPa
≥ 3,8
Stress corrosion susceptibility parameter, 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 IEC TR 62048:2014, 7.4.
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
In case of alternative nominal primary coating diameters (see Table 2), associated alternative coating strip
force values need to be agreed between supplier and customer.
d
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 categories of class B single-mode fibres are shown in Table 6.
Requirements that shall be specified in the family specifications are listed in Table 7.
Table 5 – Transmission attributes and measurement methods
Attribute Measurement method
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
NOTE The indicated maximum attenuation values apply to uncabled optical fibres; for the maximum cabled
attenuation values, reference is made to IEC 60794-2, which can be used in conjunction with this standard.
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 shall be taken
into account. As reported in IEC 60793-1-40, the spectral attenuation model, to date, has only been
demonstrated on B1 and B2 fibres
b
There are two ways to measure cut-off wavelength, leading to: fibre cut-off wavelength λ and to cable cut-
c
off wavelength λ , respectively. The correlation of the measured values of λ and λ depends on the
cc c cc
specific fibre and cable design and the test conditions. While in general λ < λ a general quantitative
cc 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
cc
1 260 nm or for worst case length and bends by recommending a maximum fibre cut-off wavelength λ to
c
be 1 250 nm.
Table 6 – Transmission, requirements common to all class B fibres
Attribute Unit Limit
a
Polarization mode dispersion (PMD) coefficient link ps/√km
design value (PMD )
Q
a
on uncabled fibre shall be agreed between supplier and customer to satisfy the
A maximum value of PMD
Q
primary requirement of cable PMD, given in IEC 60794-3.
Table 7 – Additional transmission attributes required in the family specifications
Attribute
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
Cladding diameter
Cladding non-circularity
Core concentricity error
For category B4 fibre, information for system design is given in Annex H.
5.5 Environmental requirements
5.5.1 General
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
Attribute Test method
Damp heat tests IEC 60793-1-50
Dry heat tests IEC 60793-1-51
Change of temperature tests IEC 60793-1-52
– 12 – IEC 60793-2-50:2015 © IEC 2015
Water immersion tests IEC 60793-1-53
Table 9 – Attributes measured in environmental exposure tests
Attribute Test method
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.
5.5.2 Optical environmental requirements – 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, 1 625
≤ 0,05
Dry heat 1 550, 1 625 ≤ 0,05
Change of temperature 1 550, 1 625 ≤ 0,05
Water immersion 1 550, 1 625
≤ 0,05
NOTE Attenuation changes at wavelengths lower than the test wavelength are smaller than the attenuation
change at the test wavelength.
5.5.3 Mechanical environmental requirements
5.5.3.1 General
These tests are, in practice, the most severe requirements amongst the environments defined
in Table 8.
5.5.3.2 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 1,0 ≤ F ≤ 8,9
avg peak
Water immersion
1,0 ≤ F ≤ 5,0 1,0 ≤ F ≤ 8,9
avg peak
In case of alternative nominal primary coating diameters (see Table 2), associated alternative coating strip force
values need to be agreed between supplier and customer.
5.5.3.3 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
Median tensile strength (GPa), 15 percentile of the tensile strength
Environment
specimen length: 0,5 m distribution (GPa), specimen length: 0,5 m
Damp heat
≥ 3,03 ≥ 2,76
NOTE These requirements do not apply to hermetically coated fibre. (A hermetic coating is a protective layer
that completely segregates the glass fibre from moisture, thereby ensuring a high level of stress corrosion
resistance. Typical hermetic coating is a carbon layer of several microns thickness applied on the glass
surface.)
5.5.3.4 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 parameter, n
d
Damp heat
≥ 18
NOTE This requirement does not apply to hermetically coated fibre (see definition for hermetic coating in
Table 12).
– 14 – IEC 60793-2-50:2015 © IEC 2015
Annex A
(normative)
Family specification for category 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 and 1 625 nm regions. Depending on link length and bit rates,
dispersion may need accommodation in the 1 550 nm and 1 625 nm regions.
The clauses and tables in Annex A contain particular requirements applicable to category
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
SS
“ ”
sectional specification are not repeated but indicated with a superscript .
A.2 Dimensional requirements
Table A.1 contains dimensional requirements specific to category B1.1 fibres.
Table A.1 – Dimensional requirements specific to category B1.1 fibres
Attribute Unit Limit Reference
Cladding diameter 5.2
µm 125 ± 1
Cladding non-circularity % 5.2
≤ 1,0
Core concentricity error µm ≤ 0,6 5.2
a
Primary coating diameter – uncoloured 235 to 255 5.2
µm
a
Primary coating diameter – coloured 235 to 265 5.2
µm
Primary coating-cladding concentricity error µm ≤ 12,5 5.2
Fibre length km See 5.1 5.2
a
Alternative nominal primary coating diameters may be used (see Table 2), to be agreed between supplier
and customer.
A.3 Mechanical requirements
Table A.2 contains mechanical requirements specific to category B1.1 fibres.
Table A.2 – Mechanical requirements specific to category B1.1 fibres
Attribute Unit Limit 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 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 ≥ 3,8 5.3
length
Stress corrosion susceptibility parameter, 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.
A.4 Transmission requirements
Table A.3 contains transmission requirements specific to category B1.1 fibres.
Table A.3 – Transmission requirements specific to category B1.1 fibres
Attribute Unit Limit 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
nm
Zero dispersion wavelength, λ 1 300 ≤ λ ≤ 1 324
0 0
Zero dispersion slope
2 ≤ 0,092
ps/nm ⋅ km
a
8,6 to 9,5
Nominal MFD range at 1 310 nm µm
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 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 nm 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 agr
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