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IEC 62614-1
Edition 1.0 2020-06
INTERNATIONAL
STANDARD
colour
inside
Fibre optics – Multimode launch conditions –
Part 1: Launch condition requirements for measuring multimode attenuation
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IEC 62614-1
Edition 1.0 2020-06
INTERNATIONAL
STANDARD
colour
inside
Fibre optics – Multimode launch conditions –
Part 1: Launch condition requirements for measuring multimode attenuation
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.01 ISBN 978-2-8322-8398-1
– 2 – IEC 62614-1:2020 © IEC 2020
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Background on multimode launch conditions . 6
5 Test source launch . 7
5.1 General . 7
5.2 Encircled flux . 7
5.3 Encircled flux template illustration . 7
5.4 Encircled flux target for attenuation measurement . 8
5.5 Harmonization of multimode launch conditions to eliminate wavelength bias . 9
5.6 Uncertainties expectations . 10
5.7 Encircled flux limits . 10
5.8 Practical limitations of multimode launch conditions . 11
Bibliography . 12
Figure 1 – EF template illustration for 50 µm core fibre cabling at 850 nm . 8
Figure 2 – Wavelength comparison . 9
Table 1 – EF target for 50 µm core fibre at 850 nm . 8
Table 2 – EF target for 50 µm core fibre at 1 300 nm . 8
Table 3 – EF target for 62,5 µm fibre at 850 nm . 9
Table 4 – EF target for 62,5 µm fibre at 1 300 nm . 9
Table 5 – Attenuation, threshold tolerance and confidence level . 10
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTICS – MULTIMODE LAUNCH CONDITIONS –
Part 1: Launch condition requirements for
measuring multimode attenuation
FOREWORD
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International Standard IEC 62614-1 has been prepared by subcommittee 86C: Fibre optic
systems and active devices, of IEC technical committee 86: Fibre optics.
This first edition cancels and replaces IEC 62614, published in 2010, and constitutes a technical
revision.
This edition includes the following significant technical changes with respect to IEC 62614:
a) increase of the value of the uncertainty attenuation variation coefficient Y for 50 µm core
fibre at 1 300 nm, due to launch conditions, to twice the previous value;
b) changes to 3.4, 5.6, including Table 5, and some references to remain consistent with
IEC 61280-4-1:2019;
c) changes to multimode fibre references to be consistent with IEC 60793-2-10:2019.
– 4 – IEC 62614-1:2020 © IEC 2020
The text of this International Standard is based on the following documents:
CDV Report on voting
86C/1625/CDV 86C/1654A/RVC
Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 62614 series, published under the general title Fibre optics –
Multimode launch conditions, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document 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.
FIBRE OPTICS – MULTIMODE LAUNCH CONDITIONS –
Part 1: Launch condition requirements for
measuring multimode attenuation
1 Scope
This part of IEC 62614 describes the launch condition requirements used for measuring
multimode attenuation in passive components and in installed cable plants.
In this document, the fibre types that are addressed include category A1-OMx, where x = 2, 3,
4 and 5 (50 µm/125 µm), and A1-OM1 (62,5 µm/125 µm) multimode fibres, as specified in
IEC 60793-2-10. The nominal test wavelengths detailed are 850 nm and 1 300 nm. This
document can be suitable for multimode attenuation measurements for other multimode
categories and/or other wavelengths, but the source condition for other categories and
wavelengths are not defined here.
The purpose of these requirements is as follows:
• to ensure consistency of field measurements when different types of test equipment are
used;
• to ensure consistency of factory measurements when different types of test equipment are
used;
• to ensure consistency of field measurements when compared with factory measurements.
This document describes launch condition requirements for optical attenuation using sources
with a controlled encircled flux (EF).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 61280-1-4, Fibre optic communication subsystem test procedures – Part 1-4: General
communication subsystems – Light source encircled flux measurement method
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
– 6 – IEC 62614-1:2020 © IEC 2020
3.1
encircled flux
EF
fraction of cumulative near-field power to the total output power as a function of radial distance
from the optical centre of the core
3.2
multimode attenuation
attenuation pertaining to multimode fibres and/or multimode fibre components, systems and
subsystems
3.3
reference grade launch cord
launch cords constructed with a reference grade termination at the interface to the device under
test
3.4
reference grade termination
connector and plug with tightened tolerances terminated onto an optical fibre with tightened
tolerances such that the expected attenuation of a connection formed by mating two such
assemblies is lower and more repeatable than a standard-grade termination
Note 1 to entry: An adapter, required to assure the reduced attenuation, may be considered part of the reference
grade termination where required by the test configuration.
Note 2 to entry: IEC 61755-6-2 defines reference grade terminations for 50/125 µm fibre.
4 Background on multimode launch conditions
There have been a wide range of launch conditions used for testing multimode fibre components
and systems.
...