IEC 60793-2-60:2008

IEC 60793-2-60 ®
Edition 1.0 2008-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Optical fibres –
Part 2-60: Product specifications – Sectional specification for category C single-
mode intraconnection fibres
Fibres optiques –
Partie 2-60: Spécifications de produits – Spécification intermédiaire pour fibres
unimodales d’intraconnexion de catégorie C

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IEC 60793-2-60 ®
Edition 1.0 2008-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Optical fibres –
Part 2-60: Product specifications – Sectional specification for category C single-

mode intraconnection fibres
Fibres optiques –
Partie 2-60: Spécifications de produits – Spécification intermédiaire pour fibres

unimodales d’intraconnexion de catégorie C

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX T
ICS 33.180.10 ISBN 978-2-83220-353-8

– 2 – 60793-2-60  IEC:2008
CONTENTS
FOREWORD . 4

1 Scope . 6
2 Normative references . 7
3 Terms, definitions, symbols and abbreviations . 8
3.1 Terms and definitions . 8
3.2 Symbols and abbreviations . 8
4 Specifications . 8
4.1 Dimensional requirements . 8
4.2 Mechanical requirements . 9
4.3 Transmission requirements . 9
4.4 Environmental requirements . 10
4.4.1 Transmission requirements . 11
4.4.2 Mechanical requirements . 11

Annex A (normative) Family specification for C1 single-mode fibre . 13
Annex B (normative)  Family specification for C2 single-mode fibre . 16
Annex C (normative) Family specification for C3 single-mode fibre . 19
Annex D (normative) Family specification for C4 single-mode fibre . 21

Bibliography . 23

Table 1 – List of families and main differences . 6
Table 2 – Dimensional attributes and measurement methods . 8
Table 3 – Requirements common to class C fibres . 9
Table 4 – Mechanical attributes and measurement methods . 9
Table 5 – Mechanical requirements common to class C fibres . 9
Table 6 – Transmission attributes and measurement methods . 10
Table 7 – Transmission requirements common to class C fibres . 10
Table 8 – Transmission attributes required in family specifications . 10
Table 9 – Environmental attributes and test methods . 10
Table 10 – Environment dependant mechanical or transmission attributes and test
methods . 11
Table 11 – Tensile strength requirements common to class C fibres . 11
Table 12 – Stress corrosion susceptibility requirements common to class C fibres . 12
Table A.1 – Dimensional requirements for C1 fibres. 13
Table A.2 – Mechanical requirements for C1 fibres . 13
Table A.3 – Transmission requirements for C1 fibres . 14
Table A.4 – Environment dependant transmission requirements for C1 fibres . 14
Table A.5 – Environment dependant mechanical requirements for C1 fibres . 15
Table B.1 – Dimensional requirements for C2 fibres. 16
Table B.2 – Mechanical requirements for C2 fibres . 16
Table B.3 – Transmission requirements for C2 fibres . 17

60793-2-60  IEC:2008 – 3 –
Table B.4 – Environment dependant transmission requirements for C2 fibres . 17
Table B.5 – Environment dependant mechanical requirements for C2 fibres . 18
Table C.1 – Dimensional requirements for C3 fibres . 19
Table C.2 – Mechanical requirements for C3 fibres . 19
Table C.3 – Transmission requirements for C3 fibres . 20
Table C.4 – Environment dependant transmission requirements for C3 fibres . 20
Table C.5 – Environment dependant mechanical requirements for C3 fibres . 20
Table D.1 – Dimensional requirements for C4 fibres . 21
Table D.2 – Mechanical requirements for C4 fibres . 21
Table D.3 – Transmission requirements for C4 fibres . 22
Table D.4 – Environment dependant transmission requirements for C4 fibres . 22

– 4 – 60793-2-60  IEC:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRES –
Part 2-60: Product specifications –
Sectional specification for category C
single-mode intraconnection 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,
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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
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
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5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60793-2-60 has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee 86: Fibre optics.
This bilingual version (2012-09) corresponds to the monolingual English version, published in
2008-02.The text of this standard is based on the following documents:
CDV Report on voting
86A/1160A/CDV 86A/1201/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.

60793-2-60  IEC:2008 – 5 –
A list of all parts of the IEC 60793 series can be found, under the general title Optical Fibres,
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 – 60793-2-60  IEC:2008
OPTICAL FIBRES –
Part 2-60: Product specifications –
Sectional specification for category C
single-mode intraconnection fibres

1 Scope
This part of IEC 60793 is applicable to optical fibre types C1, C2, C3, C4, as described in
Table 1. These fibres are used for the intraconnections within or between components or
photonic systems or subsystems. While the fibres are sold in lengths on the scale of
kilometres, they are normally cut into short lengths for use in these intraconnections. While
the fibres could be overcoated or buffered for the purpose of making protected pigtails, they
may be used without overcoating. They may, however, be colour-coded.
The general requirements defined in IEC 60793-2 apply to these fibres. Specific requirements
that are common to these fibres are found in the body of this text. Particular requirements for
individual fibre types or applications are defined in Annexes A, B, C and D, which refer to
normative family specifications. These family specifications are distinguished based on
optimum transmission wavelengths and nominal Mode Field Diameter (MFD), which affects
splice loss.
For each family specification, there are two sub-categories that are distinguished on the basis
of the cladding diameter and other related attributes. The conventional nominal cladding
diameter of 125 µm is augmented with the reduced cladding type product with a nominal
diameter of 80 µm. These are distinguished with the suffixes: “_125” or “_80”. For example C1
fibre can be selected as either C1_125 or C1_80. The transmission characteristics of the two
cladding diameter choices should be the same.
For each family specification except C1, there are two sub-categories that are distinguished
on the basis of transmission characteristics that relate to MFD. To denote these sub-
categories, a "_a" or "_b" suffix is added, for lower or higher MFD. In general, the fibres can
be optimised for either splice loss or macro-bend loss using MFD as a main variable. A C2
fibre with 80 µm cladding diameter and lower MFD is designated as C2_80_a.
Fibres for the C1_125 family specification can be selected fom category B1.1 or B1.3 single-
mode fibres and are suitable for use with any category B single-mode fibre at wavelengths
from 1 280 nm to 1 625 nm. Fibres for the C2 and C3 family specifications are optimized at
nominal wavelengths of 1 310 nm and 1 550 nm respectively for connection to any category B
single-mode fibre. Fibres for the C4 family specification are optimized for transporting optical
amplifier pump light at 980 nm or higher.
Table 1 – List of families and main differences
Families Nominal transmission wavelengths Nominal MFDs
nm
C1 1 260, 1 550 and 1 625 8,6 – 9,5 µm at 1 310 nm
C2 1 310
5,0 – 7,0 µm at 1 310 nm
C3 1 550 and 1 625
5,5 – 7,5 µm at 1 550 nm
C4 980
4,0 – 7,0 µm at 980 nm
60793-2-60  IEC:2008 – 7 –
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 60793-1-20, Optical fibres – Part 1-20: Measurement methods and test procedures –
Fibre geometry
IEC 60793-1-21, Optical fibres – Part 1-21: Measurement methods and test procedures –
Coating geometry
IEC 60793-1-22, Optical fibres – Part 1-22: Measurement methods and test procedures –
Length measurement
IEC 60793-1-30, Optical fibres – Part 1-30: Measurement methods and test procedures –
Fibre proof test
IEC 60793-1-31, Optical fibres – Part 1-31: Measurement methods and test procedures –
Tensile strength
IEC 60793-1-32, Optical fibres – Part 1-32: Measurement methods and test procedures –
Coating strippability
IEC 60793-1-33, Optical fibres – Part 1-33: Measurement methods and test procedures –
Stress corrosion susceptibility
IEC 60793-1-40, Optical fibres – Part 1-40: Measurement methods and test procedures –
Attenuation
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 60793-1-50, 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 60793-2, Optical fibres – Part 2: Product specifications – General
IEC/TR 61931, Fibre optic – Terminology

– 8 – 60793-2-60  IEC:2008
3 Terms, definitions, symbols and abbreviations
3.1 Terms and definitions
For the purposes of this document, the terms and definitions related to testing given in
IEC 61931, as well as the terms and definitions related to fibres given in IEC 60793-2, apply.
Moreover, the definitions of the specified attributes are contained in the test methods.
3.2 Symbols and abbreviations
The following symbols and abbreviations are used in this document:
F average strip force
avg
F peak strip force
peak
MFD Mode Field Diameter
n stress corrosion parameter – dynamic
d
4 Specifications
The fibre shall consist of a glass core, glass cladding, and coating in accordance with 5.1 of
IEC 60793-2.
4.1 Dimensional requirements
Dimensional attributes and measurement methods that may be specified are given in Table 2.
Minimum requirements, common to all fibres in this category, are given in Table 3. Some
family specification requirements may be more strict.
Table 2 – Dimensional attributes and measurement methods
Attributes Tests
Cladding diameter IEC 60793-1-20
Cladding non-circularity IEC 60793-1-20
Core concentricity error IEC 60793-1-20
Coating diameter IEC 60793-1-21
Coating non-circularity IEC 60793-1-21
Cladding-coating concentricity error IEC 60793-1-21
Fibre length IEC 60793-1-22
60793-2-60  IEC:2008 – 9 –
Table 3 – Requirements common to class C fibres
Attributes Units _125 Limits _80 Limits
a
Cladding diameter
µm 125 ± 1,0 80 ± 1,0
Cladding non-circularity %
≤ 1,0 ≤ 1,0
Core concentricity error µm ≤ 0,5 ≤ 0,5
a
Coating diameter – uncoloured 235 to 255 155 to 175
µm
b b
Fibre length km
a
Tolerance applies to the entire length of fibre.
b
Length requirements vary and should be agreed between customer and
supplier.
4.2 Mechanical requirements
Mechanical attributes and measurement methods that may be specified are given in Table 4.
Minimum mechanical requirements, common to all fibres in class C, are given in Table 5.
Some family specification values may be more strict.
Table 4 – Mechanical attributes and measurement methods
Attributes Tests
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

Table 5 – Mechanical requirements common to class C fibres
Attributes Units Limits
Proof stress level GPa
≥ 0,69
Coating strip force The coating shall be
mechanically strippable.
Heat stripping may be
most appropriate for some
coatings
Tensile strength (median) GPa ≥ 3,8
for 0,5 m specimen length
4.3 Transmission requirements
Transmission attributes and measurement methods that may be specified are given in Table
6. Some family specifications may have additional attributes or test methods. Minimum
requirements, common to all class C fibres, are given in Table 7. Some family specifications
may be more stringent. Requirements that shall be specified in the family specifications are
listed in Table 8.
– 10 – 60793-2-60  IEC:2008
Table 6 – Transmission attributes and measurement methods
Attributes Tests
a
Attenuation coefficient IEC 60793-1-40
Fibre cut-off wavelength IEC 60793-1-44
Mode field diameter IEC 60793-1-45
Macro-bending loss IEC 60793-1-47
a
The attenuation coefficient at various wavelengths can be
calculated using the measured values at a few wavelengths
using a spectral model such as the one 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.

Table 7 – Transmission requirements common to class C fibres
Attributes Units Limits
This table is empty, but retained in
case of some common minimum
requirement
Table 8 – Transmission attributes required in family specifications
Attributes required in family specifications
Maximum attenuation coefficient and wavelength
Nominal mode field diameter, tolerance, and wavelength
Macro-bending loss increase, wavelength, bend radius,
and number of turns
Fibre cut-off wavelength
NOTE Fibre cut-off wavelength is the default, but
alternative configurations may be agreed for some
applications such as fibre being used on a bobbin. In these
cases, the measured cut-off wavelength values can be
generally mapped to the bend/length conditions for the
alternative applications.
4.4 Environmental requirements
Environmental attributes tests and measurement methods are documented in two forms:
– various environmental exposure tests are given in Table 9;
– mechanical or transmission attributes that may change when subjected to environmental
exposure are listed in Table 10.
Table 9 – Environmental attributes and test methods
Environmental exposures Tests
Damp heat tests IEC 60793-1-50
Dry heat tests IEC 60793-1-51
Change of temperature tests IEC 60793-1-52

60793-2-60  IEC:2008 – 11 –
Table 10 – Environment dependant mechanical
or transmission attributes and test methods
Attributes 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 sensitivity IEC 60793-1-33
These tests are normally conducted periodically as type-tests for a fibre and coating design.
Unless otherwise specified, the recovery period allowed between completing the
environmental exposure and performing the attribute measurements shall be as stated in the
particular environmental conditioning test standard.
4.4.1 Transmission requirements
Change in attenuation from the initial value shall be less than the values specified in the
relevant family specification.
4.4.2 Mechanical requirements
These tests are, in practice, the most severe requirements amongst the environment
exposures defined in Table 9.
4.4.2.1 Coating strip force
In addition to the un-aged strip force requirements in 4.2, coating strip force after damp heat
ageing shall be specified in the family specifications. The ageing options are also specified.
4.4.2.2 Tensile strength
The attributes given in Table 11 shall be verified following removal of the fibre from the
environment.
Table 11 – Tensile strength requirements common to class C fibres
Environment Median tensile 15 % 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 or to fibre that is
intended for sole use within hermetically sealed enclosure.
4.4.2.3 Stress corrosion susceptibility
The attributes given in Table 12 shall be verified following removal of the fibre from the
environment.
– 12 – 60793-2-60  IEC:2008
Table 12 – Stress corrosion susceptibility requirements
common to class C fibres
Environment Stress corrosion
Susceptibility constant, n
d
Damp heat ≥ 18
NOTE This requirement does not apply to hermetically coated
fibre or to fibre that is intended for sole use within hermetically
sealed enclosures.
60793-2-60  IEC:2008 – 13 –
Annex A
(normative)
Family specification for C1 single-mode fibre

A.1 Introduction
The C1 single-mode fibre is a single-mode intraconnection fibre that is suitable for use with
any category B single-mode fibre at wavelengths from 1 280 nm to 1 625 nm. It is optimised
for precision glass geometry and improved macro-bending, and generally having lower fibre
cut-off wavelength compared to that of B1.1 fibres.
The following clauses and tables contain the requirements for C1 fibres. Common
requirements, copied for ease of reference from the sectional specification, are noted by an
entry in the “Ref.” column. Relevant notes from the sectional specification are not repeated,
SS
but indicated with a superscript .
A.2 Dimensional requirements
Table A.1 contains dimensional requirements for C1 fibres.
Table A.1 – Dimensional requirements for C1 fibres
Attributes Units _125 Limits _80 Limits Ref.
Cladding diameter
µm 125,0 ± 0,7 80 ± 1,0
Cladding non-circularity %
≤ 0,7 ≤ 1,0
Core concentricity error
µm ≤ 0,5 ≤ 0,5
Coating diameter – uncoloured µm 235 to 255 155 to 175 4.1
Fibre length km (See 4.1) (See 4.1) 4.1
A.3 Mechanical requirements
Table A.2 contains mechanical requirements for C1 fibres.
Table A.2 – Mechanical requirements for C1 fibres
Attributes Units _125 Limits _80 Limits Ref.

Proof stress level Gpa 4.2
≥ 0,69 ≥ 0,69
Coating strip force (average) N
1,0 ≤ F ≤ 5,0 1,0 ≤ F ≤ 5,0
avg avg
Coating strip force (peak) N F ≤ 8,9 F ≤ 8,9
peak peak
Tensile strength (median) GPa 4.2
≥ 3,8 ≥ 3,8
for 0,5 m specimen length
– 14 – 60793-2-60  IEC:2008
A.4 Transmission requirements
Table A.3 contains transmission requirements for C1 fibres. These limits apply to both _125
and _80 fibres.
Table A.3 – Transmission requirements for C1 fibres
Attributes Units Limits Ref.
Attenuation coefficient dB/km ≤ 0,7
from 1 310 nm to 1 625 nm
Mode field diameter range of nominal values µm 8,6 – 9,5
at 1 310 nm
Mode field diameter tolerance µm ± 0,4
Fibre cut-off wavelengths nm ≤ 1 280

Macro-bending loss at 1 625 nm, dB ≤ 1,0
5 turns on a 16 mm radius mandrel
A.5 Environmental requirements
The following clauses contain requirements specific to C1 fibres. These limits apply to all sub-
categories.
A.5.1 Transmission requirements
Change in attenuation from the initial value shall be less than the values in Table A.4.
Attenuation shall be measured periodically during the entire exposure to each environment
and after removal.
Table A.4 – Environment dependant transmission requirements for C1 fibres
Environment Wavelengths Maximum attenuation increase
nm dB/km
Damp heat 1 310 ≤ 0,10
1 550 ≤ 0,10
Dry heat 1 310
≤ 0,10
1 550
≤ 0,10
Change of temperature 1 310 ≤ 0,10
1 550
≤ 0,10
A.5.2 Mechanical requirements – Coating strip force
Table A.5 shows attributes that shall be verified following removal of the fibre from the
environment.
60793-2-60  IEC:2008 – 15 –
Table A.5 – Environment dependant mechanical requirements for C1 fibres
Environment Average strip force Peak strip force
N N
_125 Damp heat
1,0 ≤ F ≤ 5,0 F ≤ 8,9
avg peak
_80 Damp heat 1,0 ≤ F ≤ 5,0 F ≤ 8,9
avg peak
– 16 – 60793-2-60  IEC:2008
Annex B
(normative)
Family specification for C2 single-mode fibre

B.1 Introduction
The C2 single-mode fibre is a reduced bend loss single-mode intraconnection fibre that is
optimized for loss performance in the 1 310 nm region.
The following clauses and tables contain the requirements for C2 fibres. Common
requirements, copied for ease of reference from the sectional specification, are noted by an
entry in the “Ref.” column. Relevant notes from the sectional specification are not repeated.
SS
but indicated with a superscript .
B.2 Dimensional requirements
Table B.1 contains dimensional requirements for C2 fibres. These limits apply to both “_a”
and “_b” sub-categories.
Table B.1 – Dimensional requirements for C2 fibres
Attributes Units _125 Limits _80 Limits Ref.
Cladding diameter 4.1
µm 125,0 ± 1,0 80,0 ± 1,0
Cladding non-circularity % ≤ 1,0 ≤ 1,0 4.1
Core concentricity error 4.1
µm ≤ 0,5 ≤ 0,5
Coating diameter – uncoloured 235 to 255 155 to 175 4.1
µm
Fibre length km (See 4.1) (See 4.1) 4.1
B.3 Mechanical requirements
Table B.2 contains mechanical requirements for C2 fibres. These limits apply to both “_a” and
“_b” sub-categories.
Table B.2 – Mechanical requirements for C2 fibres
Attributes Units _125 Limits _80 Limits Ref.

Proof stress level GPa 4.2
≥ 0,69 ≥ 0,69
Coating strip force (average) N
1,0 ≤ F ≤ 5,0 1,0 ≤ F ≤ 5,0
avg avg
Coating strip force (peak) N F ≤ 8,9 F ≤ 8,9
peak peak
Tensile strength (median) GPa 4.2
≥ 3,8 ≥ 3,8
for 0,5 m specimen length
60793-2-60  IEC:2008 – 17 –
B.4 Transmission requirements
Table B.3 contains transmission requirements for C2 fibres. The limits apply to both 80 µm
and 125 µm nominal cladding diameter sub-categories.
Table B.3 – Transmission requirements for C2 fibres
Attributes Units _a Limits _b Limits Ref.
Attenuation coefficient at 1 310 nm dB/km
≤ 0,75 ≤ 0,75
Mode field diameter range of nominal values µm 5,0 – 6,0 6,1 – 7,0
at 1 310 nm
Mode field diameter tolerance
µm ± 0,75 ± 0,75
Fibre cut-off wavelength nm ≤ 1 280 ≤ 1 280

Macro-bending loss at 1 550 nm, 5 turns dB
≤ 0,02 ≤ 0,05
on a 10 mm radius mandrel
B.5 Environmental requirements
The following clauses contain requirements specific to C2 fibre. These limits apply to all sub-
categories.
B.5.1 Transmission requirements
Change in attenuation from the initial value shall be less than the values in Table B.4.
Attenuation shall be measured periodically during the entire exposure to each environment
and after removal.
Table B.4 – Environment dependant transmission requirements for C2 fibres
Environment Wavelengths Maximum attenuation increase
nm dB/km
Damp heat 1 310
≤ 0,10
Dry heat 1 310
≤ 0,10
Change of temperature 1 310 ≤ 0,10

B.5.2 Mechanical requirements – Coating strip force
Table B.5 shows attributes that shall be verified following removal of the fibre from the
environment.
– 18 – 60793-2-60  IEC:2008
Table B.5 – Environment dependant mechanical requirements for C2 fibres
Environment Average strip force Peak strip force
N N
_125 Damp heat
1,0 ≤ F ≤ 5,0 F ≤ 8,9
avg peak
_80 Damp heat 1,0 ≤ F ≤ 5,0 F ≤ 8,9
avg peak
60793-2-60  IEC:2008 – 19 –
Annex C
(normative)
Family specification for C3 single-mode fibre

C.1 Introduction
The C3 single-mode fibre is a reduced bend loss single-mode intraconnection fibre that is
optimized for loss performance in the 1 550 nm region.
The following clauses and tables contain the requirements for C3 fibres. Common
requirements, copied for ease of reference from the sectional specification, are noted by an
entry in the “Ref.” column. Relevant notes from the sectional specification are not repeated.
SS
but indicated with a superscript .
C.2 Dimensional requirements
Table C.1 contains dimensional requirements for C3 fibres. These limits apply to both “_a”
and “_b” sub-categories.
Table C.1 – Dimensional requirements for C3 fibres
Attributes Units _125 Limits _80 Limits Ref.
Cladding diameter 4.1
µm 125,0 ± 1,0 80,0 ± 1,0
Cladding non-circularity % ≤ 1,0 ≤ 1,0 4.1
Core concentricity error 4.1
µm ≤ 0,5 ≤ 0,5
Coating diameter – uncoloured 235 to 255 155 to 175 4.1
µm
Fibre length km (See 4.1) (See 4.1) 4.1
C.3 Mechanical requirements
Table C.2 contains mechanical requirements for C3 fibres. These limits apply to both “_a” and
“_b” sub-categories.
Table C.2 – Mechanical requirements for C3 fibres
Attributes Units _125 Limits _80 Limits Ref.

Proof stress level GPa 4.2
≥ 0,69 ≥ 0,69
Coating strip force (average) N
1,0 ≤ F ≤ 5,0 1,0 ≤ F ≤ 5,0
avg avg
Coating strip force (peak) N F ≤ 8,9 F ≤ 8,9
peak peak
Tensile strength (median) GPa 4.2
≥ 3,8 ≥ 3,8
for 0,5 m specimen length
– 20 – 60793-2-60  IEC:2008
C.4 Transmission requirements
Table C.3 contains transmission requirements for C3 fibres. The limits apply to both 80 µm
and 125 µm nominal cladding diameter sub-categories.
Table C.3 – Transmission requirements for C3 fibres
Attributes Units _a _b Ref.
Limits Limits
Attenuation coefficient at 1 550 nm dB/km ≤ 0,6 ≤ 0,6
Mode field diameter range of nominal values  µm 5,5– 6,5 6,6– 7,5
at 1 550 nm
Mode field diameter tolerance µm ± 0,75 ± 0,75
Fibre cut-off wavelength nm
≤ 1 500 ≤ 1 500
Macro-bending loss at 1 625 nm, 5 turns dB
≤ 0,02 ≤ 0,05
on a 10 mm radius mandrel
C.5 Environmental requirements
The following clauses contain requirements specific to C3 fibre. These limits apply to all sub-
categories.
C.5.1 Transmission requirements
Change in attenuation from the initial value shall be less than the values in Table C.4.
Attenuation shall be measured periodically during the entire exposure to each environment
and after removal.
Table C.4 – Environment dependant transmission requirements for C3 fibres
Environment Wavelengths Maximum attenuation increase
nm dB/km
Damp heat 1 550
≤ 0,10
Dry heat 1 550 ≤ 0,10
Change of temperature 1 550
≤ 0,10
C.5.2 Mechanical requirements – Coating strip force
Table C.5 shows attributes that shall be verified following removal of the fibre from the
environment.
Table C.5 – Environment dependant mechanical requirements for C3 fibres
Environment Average strip force Peak strip force
N N
_125 Damp heat 1,0 ≤ F ≤ 5,0 F ≤ 8,9
avg peak
_80 Damp heat ≤ 5,0 F ≤ 8,9
1,0 ≤ F
avg peak
60793-2-60  IEC:2008 – 21 –
Annex D
(normative)
Family specification for C4 single-mode fibre

D.1 Introduction
The C4 single-mode fibre is a single-mode intraconnection fibre that is intended to support
980 nm transmissions. Applications include fibre for Erbium Doped Fibre Amplfiers (EDFAs),
couplers, or other Dense Wavelength Division Multiplexing (DWDM) applications.
The following clauses and tables contain the requirements for C4 fibres. Common
requirements, copied for ease of reference from the sectional specification, are noted by an
entry in the “Ref.” column. Relevant notes from the sectional specification are not repeated,
SS
but indicated with a superscript .
D.2 Dimensional requirements
Table D.1 contains dimensional requirements for C4 fibres. These limits apply to both “_a”
and “_b” sub-categories.
Table D.1 – Dimensional requirements for C4 fibres
Attributes Units _125 Limits _80 Limits Ref.
Cladding diameter 4.1
µm 125,0 ± 1,0 80,0 ± 1,0
Cladding non-circularity % 4.1
≤ 1,0 ≤ 1,0
Core concentricity error 4.1
µm ≤ 0,5 ≤ 0,5
Coating diameter – uncoloured µm 235 to 255 155 to 175 4.1
Fibre length km (See 4.1) (See 4.1) 4.1
D.3 Mechanical requirements
Table D.2 contains mechanical requirements for C4 fibres. These limits apply to both “_a” and
“_b” sub-categories.
Table D.2 – Mechanical requirements for C4 fibres
Attributes Units _125 Limits _80 Limits Ref.

Proof stress level GPa ≥ 0,69 ≥ 0,69 4.2

Coating strip force The coating shall be The coating shall be 4.2
mechanically mechanically
strippable. Heat strippable. Heat
stripping may be stripping may be
most appropriate for most appropriate for
some coatings some coatings
Tensile strength GPa ≥ 3,8 ≥ 3,8 4.2
(median)
for 0,5 m specimen
length
– 22 – 60793-2-60  IEC:2008
D.4 Transmission requirements
Table D.3 contains transmission requirements for C4 fibres. The limits apply to both 80 µm
and 125 µm nominal cladding diameter sub-categories.
Table D.3 – Transmission requirements for C4 fibres
Attributes Units _a Limits _b Limits Ref.
Attenuation coefficient at 980 nm dB/km
≤ 3,0 ≤ 3,0
Mode field diameter range of nominal values at µm 4,0 – 5,0 5,1 – 7,0
980 nm
Mode field diameter tolerance
µm ± 0,5 ± 0,5
Fibre cut-off wavelengths nm < 980 < 980

Macro-bending loss, 5 turns on a 10 mm radius dB ≤ 0,10 0,01 at
mandrel 980 nm
at 1 550
a
nm
a
The bend loss at 980 nm for this condition is typically less than 0,001 dB, which is below
measurement capability for specification.

D.5 Environmental requirements
The following clauses contain requirements specific to C4 fibre. These limits apply to all sub-
categories.
D.5.1 Transmission requirements
Change in attenuation from the initial value shall be less than the values in Table D.4.
Attenuation shall be measured periodically during the entire exposure to each environment
and after removal.
Table D.4 – Environment dependant transmission requirements for C4 fibres
Environment Wavelengths Maximum attenuation increase
nm dB/km
Damp heat 980 ≤ 0,10
Dry heat 980
≤ 0,10
Change of temperature 980
≤ 0,10
D.5.2 Mechanical requirements – Coating strip force
Mechanical strippability shall be verified following removal of the fibre from the damp heat
test.
60793-2-60  IEC:2008 – 23 –
Bibliography
IEC 60793-1-34, Optical fibres – Part 1-34: Measurement methods and test procedures –
Fibre curl
IEC 60793-1-42, Optical fibres – Part 1-42: Measurement methods and test procedures –
Chromatic dispersion
IEC 60793-1-53, Optical fibres – Part 1-53: Measurement methods and test procedures –
Water immersion
IEC 60793-1-54, Optical fibres – Part 1-54: Measurement methods and test procedures –
Gamma irradiation
___________
– 24 – 60793-2-60  CEI:2008
SOMMAIRE
AVANT-PROPOS . 26
1 Domaine d’application . 28
2 Références normatives . 29
3 Termes, définitions, symboles et abréviations . 30
3.1 Termes et définitions . 30
3.2 Symboles et abréviations . 30
4 Spécifications . 30
4.1 Exigences dimensionnelles . 30
4.2 Exigences mécaniques . 31
4.3 Exigences de transmission . 31
4.4 Exigences d'environnement . 32
4.4.1 Exigences de transmission . 33
4.4.2 Exigences mécaniques . 33

Annexe A (normative) Spécification de famille pour les fibres unimodales de type C1 . 35
Annexe B (normative) Spécification de famille pour les fibres unimodales de type C2 . 38
Annexe C (normative) Spécification de famille pour les fibres unimodales de type C3 . 41
Annexe D (normative) Spécification de famille pour les fibres unimodales de type C4 . 43

Bibliographie .
...