IEC 60793-2:2011

IEC 60793-2
®

Edition 7.0 2011-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside


Optical fibres –
Part 2: Product specifications – General

Fibres optiques –
Partie 2: Spécifications de produits – Généralités


IEC 60793-2:2011

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IEC 60793-2
®

Edition 7.0 2011-11
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
PRICE CODE
INTERNATIONALE
CODE PRIX M
ICS 33.180.10 ISBN 978-2-88912-798-6

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 2 – 60793-2 © IEC:2011
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 . 10
6.3 Colours of the coating . 10
Annex A (normative) Multimode Fibres . 11
Annex B (normative) Single-mode fibres . 12

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 – Multimode fibres . 11
Table B.1 – Existing single-mode fibres . 12
Table B.2 – Existing fibres for intraconnecting . 13

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60793-2 © IEC:2011 – 3 –
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
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
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expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60793-2 has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee 86: Fibre optics.
This seventh edition cancels and replaces the sixth edition published in 2007. This
modification has been necessary because of the addition of new fibre categories to
IEC 60793-2-10 and IEC 60793-2-50.
Document ID Fibre category
60793-2-10 A1
60793-2-20 A2
60793-2-30 A3
60793-2-40 A4
60793-2-50 B (all)
60793-2-60 C

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– 4 – 60793-2 © IEC:2011
This standard is to be read in conjunction with IEC 60793-1 series.
The text of this standard is based on the following documents:
CDV Report on voting
86A/1384/CDV 86A/1416/RVC

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 60793 series, published under the general title Optical fibres, can
be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the 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.

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60793-2 © IEC:2011 – 5 –
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 class: A1, A2, A3, and A4
contain requirements specific to each category.
Sectional specifications for each of the two single-mode 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.
The following table 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 material Core material Index profile
class
60793-2-10 A1 multimode Glass Glass Graded
60793-2-20 A2 multimode Glass Glass Quasi-step or step
60793-2-30 A3 multimode Plastic Glass Step
60793-2-40 A4 multimode Plastic Plastic Step, multi-step or
graded index fibre
60793-2-50 B single-mode Glass Glass Not applicable
60793-2-60 C single-mode Glass Glass Not applicable

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– 6 – 60793-2 © IEC:2011
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 60050-731:1991, International Electrotechnical Vocabulary, Chapter 731: Optical Fibre
communication
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
an optical fibre in the core of which the radiation of two or more bound modes can propagate
at the wavelength of interest
[IEC 60050-731:1991, 731-02-03]
3.2
single-mode fibre
an optical fibre in which the radiation of only one bound mode can propagate at the
wavelength of interest
[IEC 60050-731:1991, 731-02-02, modified]
3.3
core
the central region of an optical fibre through which most of the optical power is transmitted
[IEC 60050-731:1991, 731-02-04]

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60793-2 © IEC:2011 – 7 –
3.4
cladding
that dielectric material of an optical fibre surrounding the core
[IEC 731-02-05].
3.5
primary coating
a 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
[IEC 60050-731:1991, 731-02-57, modified]
NOTE 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. [IEC 60050-731:1991, 731-02-58, modified].
3.6
buffer
a material or assembly of materials used to protect the optical fibre against physical damage
[IEC 60050-731:1991, 731-02-56]
3.7
coloured coating and/or buffer
a 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)= (2a)
n(0)−n(1)
r
x= (0≤ r≤ a) is the normalized radial position; (2b)
a
a is the core radius;
n(x) is the refractive index at normalized position x.

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– 8 – 60793-2 © IEC:2011
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
10 ≤ g < ∞
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 Nominal Nominal Nominal Nominal numerical
core cladding coating aperture
diameter diameter diameter
In case of theoretical
numerical aperture: (T)
[µm] [µm] [µm]
A1
50 125 245 0,20
A1a
(With models: A1a.1,
A1a.2, A1a.3)
A1b 62,5 125 245 0,275
A1d 100 140 245 0,26 or 0,29
A2
A2a 100 140 NS (T): 0,23 or 0,26
A2b 200 240 NS (T): 0,23 or 0,26
A2c 200 280 NS (T): 0,23 or 0,26
A3
A3a 200 300 900 (T): 0,40
A3b 200 380 600 (T): 0,40
A3c 200 230 500 (T): 0,40
A3d 200 230 500 (T): 0,35
A4
A4a NS 1 000 NA (T): 0,50
(With model A4a.1 and
A4a.2)
A4b NS 750 NA (T): 0,50
A4c NS 500 NA (T): 0,50
A4d NS 1 000 NA (T): 0,30
A4e 750 NA (T): 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.

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60793-2 © IEC:2011 – 9 –
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 unshifted This dispersion unshifted single-mode fibre is optimised 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 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 shifted This dispersion-shifted single-mode fibre is optimised for single-channel
transmission in the 1 550 nm region. Multiple channels can only be
transmitted if care is taken to avoid the effects of four-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
dispersion-shifted channel 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-zero This wideband non-zero dispersion-shifted single-mode fibre is optimised
dispersion-shifted for multiple channel transmission in the wavelength range of 1 460 nm –
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.
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 to be used in the wavelength range from 1 260 nm up
to 1 625 nm and differing in bend loss specification (minimum bend
radius respectively 10 mm and 7.5 mm). These fibres and requirements
are a subset of B1.3 fibres and have the same transmission and
interconnection properties.
B6_b2 and B6_b3 suitable for transmission at 1 310, 1 550, and
1 625 nm for restricted distances that are associated with in-building
transport of signals and differing in bend loss specifications (minimum
bend radius respectively 7.5 mm and 5 mm). These fibers have
unconstrained dispersion properties and may have different splicing and
connection properties than B1.3 fibres, but are capable of very low
values of bend radius.

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– 10 – 60793-2 © IEC:2011
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 category glass geometry and improved macrobending, and generally
B single-mode fibre at having lower fibre cut-off wavelength compared to that of B1.1
wavelengths from 1 260 nm to 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.

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60793-2 © IEC:2011 – 11 –
Annex A
(normative)

Multimode Fibres

A.1 Existing multimode fibres
Table A.1 lists existing categories of multimode fibres.
Table A.1 – Multimode fibres
“Class Category  Sub-category Model Document

Class A: Multimode fibres
 Category A1- Graded Index (Glass Core / glass cladding) 60793-2-10
  Sub-category A1a  Annex A
   Model A1a.1
   Model A1a.2
   Model A1a.3
  Sub-category A1b  Annex B
  Sub-category A1d  Annex C

 Category A2- Step Index (Glass core / glass cladding) 60793-2-20
  Sub-category A2a  Annex A
  Sub-category A2b  Annex B
  Sub-category A2c  Annex C

 Category A3- Step Index (Glass core / plastic cladding) 60793-2-30
  Sub-category A3a  Annex A
  Sub-category A3b  Annex B
  Sub-category A3c  Annex C
  Sub-category A3d  Annex D

 Category A4- Step + Graded Index Plastic optical fibre 60793-2-40
  Sub-category A4a  Annex A
   Model A4a.1
   Model A4a.2
  Sub-category A4b  Annex B
  Sub-category A4c  Annex C
  Sub-category A4d  Annex D
  Sub-category A4e  Annex E
  Sub-category A4f  Annex F
  Sub-category A4g  Annex G
  Sub-category A4h  Annex H

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– 12 – 60793-2 © IEC:2011
Annex B
(normative)

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

Class B: Single-mode fibres  60793-2-50
 Category B1.1 – Dispersion unshifted Annex A

 Category B1.2 – Cut-off shifted  Annex B
  Sub-category B1.2_b
  Sub-category B1.2_c

 Category B1.3 – Extended band  Annex C

 Category B2 – Dispersion shifted  Annex D
  Sub-category B2_a
  Sub-category B2_b

 Category B4 – Non-zero dispersion shifted Annex E
  Sub-category B4_c
  Sub-category B4_d
  Sub-category B4_e


 Category B5 – Wideband non-zero dispersion shifted Annex F

 Category B6 – Bending loss insensitive Annex G
  Sub-category B6_a
  Model B6_a1
   Model B6_a2
  Sub-category B6_b
   Model B6_b2
  Model B6_b3

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60793-2 © IEC:2011 – 13 –
B.2 Existing fibres for intraconnecting
Table B.2 lists existing fibres for intraconnecting.
Table B.2 – Existing fibres for intraconnecting
Class Category  Sub-category Document

Class: C: Single-mode fibres for Intraconnecting  60793-2-60
 Category C1 – Applicable 1 280 nm – 1625 nm Annex A
  Sub-category C1_125
  Sub-category C1_80

 Category C2 – Applicable 1 310 nm region Annex B
  Sub-category C2_125
  Sub-category C2_80

 Category
...