EN 60793-1-44:2011

SLOVENSKI STANDARD
01-september-2011
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SIST EN 60793-1-44:2004
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Optical fibres - Part 1-44: Measurement methods and test procedures - Cut-off
wavelength (IEC 60793-1-44:2011)
Lichtwellenleiter - Messmethoden und Prüfverfahren - Teil 1-44: Grenzwellenlänge (IEC
60793-1-44:2011)
Fibres optiques - Partie 1-44: Méthodes de mesure et procédures d'essai - Longueur
d'onde de coupure (CEI 60793-1-44:2011)
Ta slovenski standard je istoveten z: EN 60793-1-44:2011
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 60793-1-44
NORME EUROPÉENNE
June 2011
EUROPÄISCHE NORM
ICS 33.180.10 Supersedes EN 60793-1-44:2002

English version
Optical fibres -
Part 1-44: Measurement methods and test procedures -
Cut-off wavelength
(IEC 60793-1-44:2011)
Fibres optiques -  Lichtwellenleiter -
Partie 1-44: Méthodes de mesure et Messmethoden und Prüfverfahren -
procédures d'essai - Teil 1-44: Grenzwellenlänge
Longueur d'onde de coupure (IEC 60793-1-44:2011)
(CEI 60793-1-44:2011)
This European Standard was approved by CENELEC on 2011-05-25. 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 Central Secretariat 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 Central Secretariat 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, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60793-1-44:2011 E
Foreword
The text of document 86A/1369/FDIS, future edition 2 of IEC 60793-1-44, prepared by SC 86A, Fibres
and cables, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC parallel vote and was
approved by CENELEC as EN 60793-1-44 on 2011-05-25.
This European Standard supersedes EN 60793-1-44:2002.
The main change with respect to EN 60793-1-44:2002 is the withdrawal of Annex D.
Annexes A, B and C form an integral part of EN 60793-1-44:2011.
This standard should be read in conjunction with EN 60793-1-1.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
(dop) 2012-02-25
national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2014-05-25
with the EN have to be withdrawn
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60793-1-44:2011 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60793-2-10 NOTE  Harmonized as EN 60793-2-10.
IEC 60793-2-50 NOTE  Harmonized as EN 60793-2-50.
IEC 60793-2-60 NOTE  Harmonized as EN 60793-2-60.
__________
- 3 - EN 60793-1-44:2011
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

IEC 60793-1-1 - Optical fibres - EN 60793-1-1 -
Part 1-1: Measurement methods and test
procedures - General and guidance

IEC 60793-1-40 - Optical fibres - EN 60793-1-40 -
(mod) Part 1-40: Measurement methods and test
procedures - Attenuation
IEC 60793-1-44 ®
Edition 2.0 2011-04
INTERNATIONAL
STANDARD
Optical fibres –
Part 1-44: Measurement methods and test procedures – Cut-off wavelength

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
S
ICS 33.180.10 ISBN 978-2-88912-451-0
– 2 – 60793-1-44 ã IEC:2011(E)
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Background . 6
4 Overview of methods . 7
5 Mapping functions . 7
6 Reference test method . 8
7 Apparatus . 8
7.1 Light source . 8
7.2 Modulation . 8
7.3 Launch optics . 8
7.4 Support and positioning apparatus . 8
7.5 Cladding mode stripper . 8
7.6 Deployment mandrel . 9
7.6.1 General . 9
7.6.2 Cable cut-off wavelength, Method A . 9
7.6.3 Cable cut-off wavelength, Method B . 9
7.6.4 Fibre cut-off wavelength, Method C . 9
7.7 Detection optics . 11
7.8 Detector assembly and signal detection electronics . 11
8 Sampling and specimens . 11
8.1 Specimen length. 11
8.2 Specimen end face . 12
9 Procedure . 12
9.1 Positioning of specimen in apparatus . 12
9.1.1 General requirements for all methods . 12
9.1.2 Deployment requirements for each method . 12
9.2 Measurement of output power . 12
9.2.1 Overview . 12
9.2.2 Bend-reference technique . 13
9.2.3 Multimode-reference technique . 13
10 Calculations . 13
10.1 Bend-reference technique . 13
10.2 Multimode-reference technique . 14
10.3 Curve-fitting technique for improved precision (optional) . 14
10.3.1 General . 14
10.3.2 Step 1, define the upper-wavelength region . 15
10.3.3 Step 2, characterize the attenuation curve . 15
10.3.4 Step 3, determine the upper wavelength of the transition region . 16
10.3.5 Step 4, determine the lower wavelength of the transition region . 16
10.3.6 Step 5, characterize the transition region with the theoretical model . 16
10.3.7 Step 6, compute the cut-off wavelength, l . 17
c
11 Results . 17
11.1 Report the following information with each measurement: . 17
11.2 The following information shall be available upon request: . 17

60793-1-44 ã IEC:2011(E) – 3 –
12 Specification information . 18
Annex A (normative) Requirements specific to method A – Cable cut-off wavelength,
l , using uncabled fibre . 19
cc
Annex B (normative) Requirements specific to method B – Cable cut-off wavelength,
l , using cabled fibre . 20
cc
Annex C (normative) Requirements specific to method C – Fibre cut-off wavelength,
l . 21
c
Bibliography . 22

Figure 1 – Deployment configuration for cable cut-off wavelength, method A . 9
Figure 2 – Deployment configuration for cable cut-off wavelength, method B . 10
Figure 3 – Default configuration to measure l . 10
c
Figure 4 – Deployment configurations for fibre cut-off measurement . 11
Figure 5 – Cut-off wavelength using the bend-reference technique . 12
Figure 6 – Cut-off wavelength using the multimode-reference technique . 13

– 4 – 60793-1-44  IEC:2011(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRES –
Part 1-44: Measurement methods and test procedures –
Cut-off wavelength
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
...