IEC 60793-2:2015

IEC 60793-2 ®
Edition 8.0 2015-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical fibres –
Part 2: Product specifications – General

Fibres optiques –
Partie 2: Spécifications de produits – Généralités

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IEC 60793-2 ®
Edition 8.0 2015-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical fibres –
Part 2: Product specifications – General

Fibres optiques –
Partie 2: Spécifications de produits – Généralités

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.10 ISBN 978-2-8322-2987-3

– 2 – IEC 60793-2:2015  IEC 2015

CONTENTS
FOREWORD . 3

1 Scope . 5

2 Normative references . 6

3 Terms and definitions . 6

4 Quality assurance . 7

5 Construction of optical fibres . 7

5.1 Class A – Multimode fibres . 7
5.2 Class B – Single-mode fibres . 9
5.3 Class C – Single-mode fibres for intraconnection . 10
6 General requirements . 10
6.1 Coating . 10
6.2 Interface with the coating . 11
6.3 Colours of the coating . 11
Annex A (normative) Existing multimode fibres . 12
Annex B (normative) Existing single-mode fibres . 13
B.1 Existing single-mode fibres . 13
B.2 Existing fibres for intraconnection . 13
Bibliography . 15

Table 1 – Sectional specifications . 5
Table 2 – Main categories of multimode fibres . 8
Table 3 – Sub-categories of multimode fibres . 8
Table 4 – Categories of glass core/glass clad single-mode fibres . 9
Table 5 – Categories of glass core/glass clad single-mode fibres for intraconnection . 10
Table A.1 – Existing multimode fibres . 12
Table B.1 – Existing single-mode fibres . 13
Table B.2 – Existing fibres for intraconnection . 14

INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
OPTICAL FIBRES –
Part 2: Product specifications –

General
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
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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.
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60793-2 has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee 86: Fibre optics.
This eighth edition cancels and replaces the seventh edition published in 2011. This edition
constitutes a technical revision which was necessary due to the addition of new fibre models
to the A1 category in IEC 60793-2-10.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of two new sub-categories A3f and A3g indicated “under consideration” as they
have not yet been fully standardized at the moment of finalizing this document;
b) modification of the Numerical aperture heading in Table 3 in line with recent modifications
in all A1, A2, A3 and A4 multimode product specifications (NA only).
ff
This standard is to be read in conjunction with the IEC 60793-1 series.

– 4 – IEC 60793-2:2015  IEC 2015

The text of this standard is based on the following documents:

CDV Report on voting
86A/1645/CDV 86A/1663/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 website 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: Product specifications –

General
1 Scope
This part of IEC 60793 contains the general specifications for both multimode and single-
mode optical fibres.
Sectional specifications for each of the four categories multimode fibres: A1, A2, A3, and A4
(part of the multimode fibre class A) contain requirements specific to each category.
Sectional specifications for each of the two single-mode fibre classes, B and C, contain
requirements common to each class.
Each sectional specification includes family specifications (in normative annexes) that contain
requirements for the applicable category or sub-categories. These sub-categories are
distinguished on the basis of different fibre types or applications.
The requirements of this standard apply to all classes.
Each sectional specification contains the requirements that are common to all the family
specifications that are within it. These common requirements are copied to the family
specification for ease of reference.
Tests or measurement methods are defined for each specified attribute. Where possible,
these definitions are by reference to an IEC standard – otherwise the test or measurement
method is outlined in the relevant sectional specification.
Table 1 defines the sectional specifications. The relevant family specifications are defined
within the sectional specifications as normative annexes (see Tables 2 to 5).
Annexes A and B summarize the existing fibre specifications.
Table 1 – Sectional specifications

Document ID Fibre category / Cladding Core material Index profile
class material
IEC 60793-2-10 A1 multimode Glass Glass Graded
IEC 60793-2-20 A2 multimode Glass Glass Quasi-step or step
IEC 60793-2-30 A3 multimode Plastic Glass Step or graded (under
consideration)
IEC 60793-2-40 A4 multimode Plastic Plastic Step, multi-step or
graded
IEC 60793-2-50 B single-mode Glass Glass Not applicable
IEC 60793-2-60 C single-mode Glass Glass Not applicable

– 6 – IEC 60793-2:2015  IEC 2015

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 60304, Standard colours for insulation for low-frequency cables and wires

IEC 60793-1 (all parts), Optical fibres − Part 1: Measurement methods and test procedures

IEC 60793-2-10, Optical fibres − Part 2-10: Product specifications – Sectional specification for
category A1 multimode fibres
IEC 60793-2-20, Optical fibres − Part 2-20: Product specifications – Sectional specification for
category A2 multimode fibres
IEC 60793-2-30, Optical fibres − Part 2-30: Product specifications – Sectional specification for
category A3 multimode fibres
IEC 60793-2-40, Optical fibres − Part 2-40: Product specifications – Sectional specification for
category A4 multimode fibres
IEC 60793-2-50, Optical fibres − Part 2-50: Product specifications – Sectional specification for
class B single-mode fibres
IEC 60793-2-60, Optical fibres − Part 2-60: Product specifications – Sectional specification for
category C single-mode intraconnection fibres
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
multimode fibre
optical fibre in the core of which the radiation of two or more bound modes can propagate at
the wavelength of interest
[SOURCE: IEC 60050-731:1991, 731-02-03]

3.2
single-mode fibre
optical fibre in which the radiation of only one bound mode can propagate at the wavelength
of interest
[SOURCE: IEC 60050-731:1991, 731-02-02, modified — Note deleted]
3.3
core
central region of an optical fibre through which most of the optical power is transmitted
[SOURCE: IEC 60050-731:1991, 731-02-04]

3.4
cladding
dielectric material of an optical fibre surrounding the core

[SOURCE: IEC 60050-731:1991, 731-02-05]

3.5
primary coating
thin coating applied directly to the cladding, usually at the time of the fibre drawing, in one or
more layers, to preserve integrity of the cladding surface

Note 1 to entry: A secondary coating may be applied directly to the primary coating, of one or more fibres, to
reinforce the protection of the optical fibre during handling and cabling.
[SOURCE: IEC 60050-731:1991, 731-02-57, modified — the phrase "usually at the time .
...more layers" and the note 1 to entry have been added]
3.6
fibre buffer
material or assembly of materials used to protect the optical fibre against physical damage
[SOURCE: IEC 60050-731:1991, 731-02-56]
3.7
coloured coating and/or buffer
thin coating and/or buffer applied on the primary coating and/or buffer or on the secondary
coating in order to make each fibre distinguishable by its colour
4 Quality assurance
It is the responsibility of the supplier to establish quality assurance by quality control
procedures which ensures that the product meets the requirements of this standard and the
related sectional specifications and family specifications. It is not intended that a complete
testing programme be carried out on every length of fibre. When the customer wishes to
specify acceptance tests or other quality procedures, it is essential that an agreement be
reached between the supplier and the customer at the time of ordering.
5 Construction of optical fibres
5.1 Class A – Multimode fibres
The main fibre categories are based on g, the refractive index profile parameter, see Table 2.

The normalized index profile is expressed as:
g
δ(x)=1−x
(1)
where
n(x)−n(1)
δ(x)= (2)
n(0)−n(1)
r
(0≤ r≤ a) is the normalized radial position; (3)
x=
a
a is the core radius;
n(x) is the refractive index at normalized position x.

– 8 – IEC 60793-2:2015  IEC 2015

Table 2 – Main categories of multimode fibres

Category Material Type Limits
A1 Glass core/glass cladding Graded index fibre
1 ≤ g < 3
A2 Glass core/glass cladding Step and quasi-step index fibre
3 ≤ g < ∞
A3 Glass core/plastic cladding Step index fibre or
10 ≤ g < ∞
graded index fibre (under
1 ≤ g ≤ 3
consideration)
A4 Plastic core/plastic cladding Step, multi-step, or graded index fibre
1 ≤ g < ∞
NOTE Attention is drawn to the index profile as stated in the detail specification. The fibre category is determined
on the basis of the material type and the g value which best fits the normalized refractive index profile, falling
within the category defined above.
A further differentiation of sub-categories inside the main categories is given in Table 3.
Table 3 – Sub-categories of multimode fibres
Category Sub-categories/Models Nominal Nominal Nominal Nominal numerical
core cladding coating aperture (NA )
ff
diameter diameter diameter
µm µm µm
A1
A1a With models: 50 125 245 0,20
A1a.1a (traditional macrobend loss)
A1a.1b (enhanced macrobend loss)
A1a.2a (traditional macrobend loss)
A1a.2b (enhanced macrobend loss)
A1a.3a (traditional macrobend loss)
A1a.3b (enhanced macrobend loss)
A1b 62,5 125 245 0,275
A1d 100 140 245 0,26 or 0,29
A2
A2a 100 140 NS 0,23 or 0,26
A2b 200 240 NS 0,23 or 0,26
A2c 200 280 NS 0,23 or 0,26
A3
A3a 200 300 900 0,40
A3b 200 380 600 0,40
A3c 200 230 500 0,40
A3d 200 230 500 0,35
A3e 200 230 500 0,37
A3f (Under consideration) 50 230 500 0,20
A3g (Under consideration) 62,5 230 500 0,275
A4
A4a NS 1 000 NA (A4a.1): 0,50
(With models A4a.1 and A4a.2)
(A4a.2): 0,485
A4b NS 750 NA 0,50
A4c NS 500 NA 0,50
A4d NS 1 000 NA 0,30
Category Sub-categories/Models Nominal Nominal Nominal Nominal numerical

core cladding coating aperture (NA )
ff
diameter diameter diameter
µm µm µm
A4e 750 NA 0,25
≥500
A4f 200 490 NA 0,19
A4g 120 490 NA 0,19
A4h 62,5 245 NA 0,19
NOTE 1 NA = not applicable; NS = not specified.

NOTE 2 All three A1a models indicated in Table 3 differ in bandwidth (or DMD) requirements.

5.2 Class B – Single-mode fibres
The categories of single-mode fibres currently in use are given in Table 4.
Table 4 – Categories of glass core/glass clad single-mode fibres
Category Type Description
B1.1 Dispersion This dispersion unshifted single-mode fibre is optimised for use in the
unshifted 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 region.
B1.2 Cut-off shifted This category of dispersion unshifted single-mode fibre is optimised for
low loss in the 1 550 nm region.
B1.3
Extended band This dispersion unshifted single-mode fibre can be used from 1 260 nm up
to 1 625 nm. Chromatic dispersion in this band may impose requirements
either on the maximum link length, or the need for accommodation.
B2 Dispersion This dispersion-shifted single-mode fibre is optimised for single-channel
shifted transmission in the 1 550 nm region. Multiple channels can only be
transmitted if care is taken to avoid the effects of four-wave mixing by, for
example, moderating the power levels or appropriate spacing or
placement of the channels.
Two sub-categories are recognized (B2_a and B2_b) differing in
chromatic dispersion characteristics.
B4 Non-zero This dispersion-shifted single-mode fibre is optimised for multiple channel
dispersion-shifted transmission in the 1 550 nm region. The dispersion coefficient is required
to be non-zero throughout the band from 1 530 nm to 1 565 nm, but may
be either positive or negative. Depending on the dispersion
characteristics, multiple channel transmission may be possible at bands
either above or below the normal 1 550 nm region.
Three sub-categories are recognized (B4_c, B4_d and B4_e), differing in

chromatic dispersion characteristics.
B5 Wideband non- This wideband non-zero dispersion-shifted single-mode fibre is optimised
zero dispersion- for multiple channel transmission in the wavelength range of 1 460 nm to
shifted 1 625 nm with the positive value of the chromatic dispersion coefficient
that is greater than some non-zero value. This fibre can be used for both
CWDM and DWDM systems throughout the wavelength region between
1 460 nm and 1 625 nm.
– 10 – IEC 60793-2:2015  IEC 2015

Category Type Description
B6 Bending loss This category of single-mode fibre is optimised for improved bending loss.

insensitive Four sub-categories are recognized:

B6_a1 and B6_a2 fibres are a subset of category B1.3 fibres and

therefore are compliant with B1.3 fibres and have the same transmission
properties. Sub-category B6_a1 fibres are appropriate for a minimum
bend radius of 10 mm; sub-category B6_a2 fibres for a minimum bend

radius of 7,5 mm.
B6_b2 and B6_b3 fibres are intended to be used for restricted distances

(less than 1 000 m) at the end of Access networks, in particular inside

buildings or near buildings (e.g. outside building riser cabling).
Application length of B6_b fibre, however, depends on the deployment

strategy of each network operator.
Sub-category B6_b fibres are not necessarily compliant with category
B1.3 fibres in terms of chromatic dispersion coefficient specifications.
These fibres, however, are system compatible with B6_a (and B1.3) fibres
in Access networks.
Sub-category B6_b2 fibres are appropriate for a minimum bend radius of
7,5 mm; sub category B6_b3 fibres for a minimum bend radius of 5 mm.

5.3 Class C – Single-mode fibres for intraconnection
The categories of single-mode fibres for intraconnection currently in use are given in Table 5.
Table 5 – Categories of glass core/glass clad single-mode fibres for intraconnection
Category Type Description
C1 Single-mode intraconnection fibre This category of single-mode fibre is optimised for precision
suitable for use with any class B glass geometry and improved macrobending, and generally
single-mode fibre at wavelengths having lower fibre cut-off wavelength compared to that of
from 1 260 nm to B1.1 fibres.
1 625 nm.
C2 Single-mode intraconnection fibre This category of single-mode fibre with reduced mode field
suitable for use from 1 260 nm to diameter is optimised for loss performance in the 1 310 nm
1 360 nm region.
C3
Single-mode intraconnection fibre This category of single-mode fibre with reduced mode field
suitable for use from 1 530 nm to diameter is optimised for loss performance in the 1 550 nm
1 625 nm region.
C4 Single-mode intraconnection fibre This single-mode intraconnection fibre is intended to support
suitable for use at 980 nm 980 nm transmissions.
NOTE All four categories indicated in Table 5 have sub-categories based on 125 µm and 80 µm cladding
diameter.
6 General requirements
6.1 Coating
Fibres with glass cladding shall be coated with a material suitable for protecting the cladding
material from damage. For fibres with coatings:
a) the coating shall be in close contact with the cladding material to preserve the initial
integrity of the surface;
b) the coating consists of one or more layers of the same or different materials;
c) the coating shall be removable for connecting purposes, except where it is used as a
reference surface. The method of removal shall be agreed between the supplier and the
customer.
6.2 Interface with the coating

The interstices between the coated fibre (when the fibre is coated) and loose buffer can be

filled with a suitable fluid or easily deformable materials.

6.3 Colours of the coating
When fibre is coloured:
a) colours shall correspond reasonably with IEC 60304, of which the following are examples:

natural or white, red, yellow, blue, green, etc.;

b) a marking over the colour may be used. If used, the marking shall consist of distinctive

coloured rings, lines, or helices. Printed markings shall adhere satisfactorily. Marking shall
be easily identifiable with a constant repeated distance.

– 12 – IEC 60793-2:2015  IEC 2015

Annex A
(normative)
Existing multimode fibres
Table A.1 lists existing categories of multimode fibres.

Table A.1 – Existing multimode fibres

Class Category Sub-category Model Document

A: Multimode fibres
A1 – Graded index (Glass core/glass cladding) IEC 60793-2-10
A1a  Annex A
A1a.1a and A1a.1b
A1a.2a and A1a.2b
A1a.3a and A1a.3b
A1b  Annex B
A1d  Annex C
A2 – Step index (Glass core/glass cladding) IEC 60793-2-20
A2a  Annex A
A2b  Annex B
A2c  Annex C
A3 – Step or graded index (Glass core/plastic cladding) IEC 60793-2-30
A3a  Annex A
A3b  Annex B
A3c  Annex C
A3d  Annex D
A3e Annex E
A3f Under consideration
A3g Under consideration
A4 – Step or graded index plastic optical fibre IEC 60793-2-40
A4a  Annex A
A4a.1
A4a.2
A4b  Annex B
A4c  Annex C
A4d  Annex D
A4e  Annex E
A4f  Annex F
A4g  Annex G
A4h  Annex H
Annex B
(normative)
Existing single-mode fibres
B.1 Existing single-mode fibres

Table B.1 lists existing categories of single-mode fibres.

Table B.1 – Existing single-mode fibres

Class Category Sub-category Model Document
B: Single-mode fibres   IEC 60793-2-50
B1.1 – Dis
...