EN 60793-1-60:2017

SLOVENSKI STANDARD
01-julij-2017
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Optical fibres - Part 1-60: Measurement methods and test procedures - Beat length (IEC
60793-1-60:2017)
Ta slovenski standard je istoveten z: EN 60793-1-60:2017
ICS:
33.180.10 2SWLþQDYODNQDLQNDEOL Fibres and cables
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 60793-1-60

NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2017
ICS 33.180.10
English Version
Optical fibres - Part 1-60: Measurement methods and test
procedures - Beat length
(IEC 60793-1-60:2017)
Fibres optiques - Partie 1-60: Méthodes de mesure et Lichtwellenleiter - Teil 1-60: Messmethoden und
procédures d'essai - Longueur de battement Prüfverfahren - Schwebungslänge
(IEC 60793-1-60:2017) (IEC 60793-1-60:2017)
This European Standard was approved by CENELEC on 2017-03-14. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 60793-1-60:2017 E
European foreword
The text of document 86A/1737/CDV, future edition 1 of IEC 60793-1-60, prepared by SC 86A "Fibres
and cables" of IEC/TC 86 "Fibre optics" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN 60793-1-60:2017.
The following dates are fixed:
• latest date by which the document has to be implemented at (dop) 2017-12-14
national level by publication of an identical national
standard or by endorsement
• latest date by which the national standards conflicting with (dow) 2020-03-14
the document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC 60793-1-60:2017 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated :
IEC 60793-2 NOTE Harmonized as EN 60793-2.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is
available here: www.cenelec.eu.

Publication Year Title EN/HD Year
IEC 60068-1 -  Environmental testing - Part 1: General EN 60068-1 -
and guidance
IEC 60793-1-1 -  Optical fibres - Part 1-1: Measurement EN 60793-1-1 -
methods and test procedures - General
and guidance
IEC 60793-1-48 -  Optical fibres - Part 1-48: Measurement EN 60793-1-48 -
methods and test procedures -
Polarization mode dispersion
IEC 60793-2-70 -  Optical fibres - Part 2-70: Product EN 60793-2-70 -
specifications - Sectional specification
for polarization-maintaining fibres

IEC 60793-1-60 ®
Edition 1.0 2017-02
INTERNATIONAL
STANDARD
colour
inside
Optical fibres –
Part 1-60: Measurement methods and test procedures – Beat length

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.10 ISBN 978-2-8322-3865-3

– 2 – IEC 60793-1-60:2017 © IEC 2017
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Testing conditions . 6
5 Reference test method . 6
6 Specimen . 6
7 Test methods . 6
7.1 Phase beat length measurement methods . 6
7.1.1 General . 6
7.1.2 Monitoring of output power using an electromagnet . 6
7.1.3 Monitoring of SOP using a lateral force . 8
7.2 Group beat length measurement method . 10
7.2.1 General . 10
7.2.2 Apparatus and procedure. 10
7.2.3 Calculation . 11
8 Results . 11
8.1 Information available with each measurement . 11
8.2 Information available upon request . 12
Annex A (informative) Difference of beat lengths by measurement method (phase
beat length and group beat length) . 13
A.1 Phase modal birefringence and phase beat length . 13
A.2 Group modal birefringence and group beat length . 13
Annex B (informative) Correlation between results obtained by the two methods
(phase beat length and group beat length) . 16
B.1 General . 16
B.2 Example of correlation between phase and group beat lengths in the case of
PANDA fibres . 16
B.3 Example of correlation between phase and group beat lengths in the case of
elliptical core fibres . 17
Annex C (informative) Electromagnet for Faraday rotation . 18
Bibliography . 19

Figure 1 – Apparatus of phase beat length measurement using an electromagnet . 6
Figure 2 – Example of measurement profile by electromagnet . 8
Figure 3 – Set-up for measuring L when monitoring SOP together with a
B(phase)
moving lateral force . 9
Figure 4 – SOP measured at different levels of lateral force . 10
Figure 5 – Example of SOP evolution and normalized Stokes vector components . 10
Figure B.1 – Wavelength dependence of B /B [3] . 16
group phase
Figure C.1 – Schematic of the electromagnet . 18

Table B.1 – B /B of elliptical core fibres . 17
group phase
IEC 60793-1-60:2017 © IEC 2017 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRES –
Part 1-60: Measurement methods and test procedures –
Beat length
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
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
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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.
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 60793-1-60 has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee 86: Fibre optics.
The text of this International Standard is based on the following documents:
CDV Report on voting
86A/1737/CDV 86A/1782/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 60793 series, published under the general title Optical fibres, can
be found on the IEC website.
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