Optical fibres - Part 1-34: Measurement methods and test procedures - Fibre curl (IEC 60793-1-34:2021)

This part of IEC 60793 establishes uniform requirements for the mechanical characteristic: fibre
curl or latent curvature in uncoated optical fibres, i.e. a specified length of the fibre has been
stripped from coating. Fibre curl has been identified as an important parameter for minimizing
the splice loss of optical fibres when using passive alignment fusion splicers or active alignment
mass fusion splicers.
Two methods are recognized for the measurement of fibre curl, in uncoated optical fibres:
• method A: side view microscopy;
• method B: laser beam scattering.
Both methods measure the radius of curvature of an uncoated fibre by determining the amount
of deflection that occurs as an unsupported fibre end is rotated about the fibre's axis. Method A
uses visual or digital video methods to determine the deflection of the fibre while method B uses
a line sensor to measure the maximum deflection of one laser beam relative to a reference laser
beam.
By measuring the deflection behaviour of the fibre as it is rotated about its axis and
understanding the geometry of the measuring device, the fibre's radius of curvature can be
calculated from simple circular models, the derivation of which are given in Annex C.
Both methods are applicable to type B optical fibres as described in IEC 60793 (all parts).
Method A is the reference test method, used to resolve disputes.

Lichtwellenleiter - Teil 1-34: Messmethoden und Prüfverfahren - Faserringeln (IEC 60793-1-34:2021)

Fibres optiques - Partie 1-34: Méthodes de mesure et procédures d'essai - Ondulation de la fibre (IEC 60793-1-34:2021)

IEC 60793-1-34:2021 est disponible sous forme de IEC 60793-1-34:2021 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 60793-1-34:2021 établit des exigences uniformes pour les caractéristiques mécaniques: ondulation de fibre ou courbure latente des fibres optiques sans revêtement, c'est-à-dire qu'une longueur spécifiée de la fibre a été dénudée. L'ondulation de fibre a été définie comme étant un paramètre important de réduction des pertes d'épissure des fibres optiques lors de l'utilisation de soudeuses par fusion avec alignement passif ou de soudeuses par fusion de masse avec alignement actif. Deux méthodes sont reconnues pour la mesure de l'ondulation de fibre, pour les fibres optiques sans revêtement: - méthode A: par microscopie latérale; - méthode B: par diffusion d'un faisceau laser. Les deux méthodes mesurent le rayon de courbure d'une fibre sans revêtement en déterminant la valeur de la flèche d'une extrémité de fibre non soutenue soumise à une rotation autour de son axe. La méthode A utilise des méthodes visuelles ou vidéo numériques pour déterminer la flèche de la fibre tandis que la méthode B utilise un capteur de ligne pour mesurer la flèche maximale d’un faisceau laser par rapport à un faisceau laser de référence. En mesurant le comportement de la flèche de la fibre pendant qu’elle est soumise à une rotation autour de son axe et d’après la configuration du dispositif de mesure, le rayon de courbure de la fibre peut être calculé à partir de modèles circulaires simples, déterminés à l’Annexe C. Ces deux méthodes sont applicables aux fibres optiques du type B telles que décrites dans la série IEC 60793 (toutes les parties). La méthode A est la méthode d'essai de référence, utilisée en cas de litige. Cette troisième édition annule et remplace la deuxième édition parue en 2006. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: - modification de plusieurs équations de détermination pour la diffusion laser; - modification de l'incrément angulaire qui passe de 10° à 30° à 10° à 45°; - changement de statut de l'Annexe B qui devient normative.

Optična vlakna - 1-34. del: Merilne metode in postopki preskušanja - Zvijanje vlaken (IEC 60793-1-34:2021)

General Information

Status
Published
Publication Date
22-Apr-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
31-Mar-2021
Due Date
05-Jun-2021
Completion Date
23-Apr-2021

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SLOVENSKI STANDARD
SIST EN IEC 60793-1-34:2021
01-junij-2021
Nadomešča:
SIST EN 60793-1-34:2006
Optična vlakna - 1-34. del: Merilne metode in postopki preskušanja - Zvijanje
vlaken (IEC 60793-1-34:2021)

Optical fibres - Part 1-34: Measurement methods and test procedures - Fibre curl (IEC

60793-1-34:2021)

Lichtwellenleiter - Teil 1-34: Messmethoden und Prüfverfahren - Faserringeln (IEC 60793

-1-34:2021)

Fibres optiques - Partie 1-34: Méthodes de mesure et procédures d'essai - Ondulation

de la fibre (IEC 60793-1-34:2021)
Ta slovenski standard je istoveten z: EN IEC 60793-1-34:2021
ICS:
33.180.10 (Optična) vlakna in kabli Fibres and cables
SIST EN IEC 60793-1-34:2021 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 60793-1-34:2021
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SIST EN IEC 60793-1-34:2021
EUROPEAN STANDARD EN IEC 60793-1-34
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2021
ICS 33.180.10 Supersedes EN 60793-1-34:2006 and all of its
amendments and corrigenda (if any)
English Version
Optical fibres - Part 1-34: Measurement methods and test
procedures - Fibre curl
(IEC 60793-1-34:2021)

Fibres optiques - Partie 1-34: Méthodes de mesure et Lichtwellenleiter - Teil 1-34: Messmethoden und

procédures d'essai - Ondulation de la fibre Prüfverfahren - Faserringeln
(IEC 60793-1-34:2021) (IEC 60793-1-34:2021)

This European Standard was approved by CENELEC on 2021-03-17. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, 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: Rue de la Science 23, B-1040 Brussels

© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 60793-1-34:2021 E
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SIST EN IEC 60793-1-34:2021
EN IEC 60793-1-34:2021 (E)
European foreword

The text of document 86A/1971/CDV, future edition 3 of IEC 60793-1-34, 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 IEC 60793-1-34:2021.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2021-12-17

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2024-03-17

document have to be withdrawn

This document supersedes EN 60793-1-34:2006 and all of its amendments and corrigenda (if any).

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 60793-1-34:2021 was approved by CENELEC as a

European Standard without any modification.
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SIST EN IEC 60793-1-34:2021
EN IEC 60793-1-34:2021 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.

NOTE 1 Where 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 60793 series Optical fibres - Part 1: Generic specification EN IEC 60793 series

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SIST EN IEC 60793-1-34:2021
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SIST EN IEC 60793-1-34:2021
IEC 60793-1-34
Edition 3.0 2021-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical fibres –
Part 1-34: Measurement methods and test procedures – Fibre curl
Fibres optiques –
Partie 1-34: Méthodes de mesure et procédures d’essai – Ondulation de la fibre
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.10 ISBN 978-2-8322-9396-6

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN IEC 60793-1-34:2021
– 2 – IEC 60793-1-34:2021  IEC 2021
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 6

4 Apparatus ........................................................................................................................ 7

4.1 Principle ................................................................................................................. 7

4.2 Fibre holding fixture ................................................................................................ 7

4.3 Fibre rotator ............................................................................................................ 7

4.4 Deflection measurement device .............................................................................. 7

4.5 Computer (optional) ................................................................................................ 7

5 Sample preparation ......................................................................................................... 7

6 Procedure ........................................................................................................................ 7

6.1 General ................................................................................................................... 7

6.2 Mounting of the fibre ............................................................................................... 7

6.3 Rotation .................................................................................................................. 8

7 Calculation ...................................................................................................................... 8

8 Result .............................................................................................................................. 8

9 Specification information ................................................................................................. 8

Annex A (normative) Fibre curl by side view microscopy ........................................................ 9

A.1 Principle ................................................................................................................. 9

A.2 Apparatus ............................................................................................................. 10

A.2.1 Deflection measurement device ..................................................................... 10

A.2.2 Video camera and monitor ............................................................................. 11

A.2.3 Digital image analysis system (optional) ........................................................ 11

A.3 Test procedure ...................................................................................................... 11

A.3.1 General ......................................................................................................... 11

A.3.2 Procedure for the extrema technique ............................................................. 11

A.3.3 Procedure for the Fourier fitting technique ..................................................... 11

A.4 Calculations .......................................................................................................... 11

A.4.1 Extrema technique calculation ....................................................................... 11

A.4.2 Fourier fitting technique calculation ............................................................... 11

A.4.3 Computation of fibre curl................................................................................ 12

Annex B (normative) Fibre curl by laser beam scattering ..................................................... 13

B.1 Principle ............................................................................................................... 13

B.2 Apparatus ............................................................................................................. 13

B.2.1 Light source ................................................................................................... 13

B.2.2 Detector ........................................................................................................ 13

B.3 Test procedure ...................................................................................................... 13

B.3.1 General ......................................................................................................... 13

B.3.2 Procedure for the extrema technique ............................................................. 13

B.3.3 Procedure for the Fourier fitting technique ..................................................... 13

B.4 Calculations .......................................................................................................... 13

B.4.1 Extrema technique calculation ....................................................................... 13

B.4.2 Fourier fitting technique calculation ............................................................... 14

B.4.3 Computation of fibre curl................................................................................ 14

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SIST EN IEC 60793-1-34:2021
IEC 60793-1-34:2021  IEC 2021 – 3 –

Annex C (informative) Derivation of the circular fibre curl model .......................................... 15

C.1 Derivation of equations for side view microscopy .................................................. 15

C.2 Derivation of equations for the laser scattering method ......................................... 16

Figure A.1 – Schematic diagram for apparatus to measure fibre curl using an optical

microscope ............................................................................................................................. 9

Figure A.2 – Schematic diagram for apparatus to measure fibre curl using a laser

micrometer............................................................................................................................ 10

Figure A.3 – Schematic diagram for apparatus to measure fibre curl while securing the

sample in a ferrule ................................................................................................................ 10

Figure B.1 – Schematic diagram of optical curl by laser beam scattering .............................. 14

Figure C.1 – Geometrical layout of side view microscopy fibre curl measurement ................. 15

Figure C.2 – Geometrical layout of laser scattering fibre curl measurement .......................... 16

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SIST EN IEC 60793-1-34:2021
– 4 – IEC 60793-1-34:2021  IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRES –
Part 1-34: Measurement methods and test procedures – Fibre curl
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.

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 60793-1-34 has been prepared by subcommittee 86A: Fibres and

cables, of IEC technical committee 86: Fibre optics.

This third edition cancels and replaces the second edition published in 2006. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) modification of several derivation equations for laser scattering;
b) change of angular increment from 10° to 30° to 10° to 45°;
c) change of Annex B from informative to normative.
The text of this International Standard is based on the following documents:
CDV Report on voting
86A/1971/CDV 86A/1994/RVC
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SIST EN IEC 60793-1-34:2021
IEC 60793-1-34:2021  IEC 2021 – 5 –

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.
The committee has decided that the contents of this document will remai
...

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