EN 61744:2001

EUROPEAN STANDARD EN 61744
NORME EUROPÉENNE
EUROPÄISCHE NORM April 2001
ICS 33.180.01
English version
Calibration of fibre optic chromatic dispersion test sets
(IEC 61744:2001)
Etalonnage des ensembles Kalibrierung von Prüf-Aufbauten zur
de la dispersion chromatique Bestimmung der chromatischen
des fibres optiques Dispersion
(CEI 61744:2001) (IEC 61744:2001)
This European Standard was approved by CENELEC on 2001-01-01. 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, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway,
Portugal, Spain, Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61744:2001 E
Foreword
The text of document 86/170/FDIS, future edition 1 of IEC 61744:2001, prepared by IEC TC 86, Fibre
optics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
EN 61744 on 2001-01-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2001-11-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2004-01-01
Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annexes A, B and ZA are normative and annexes C and D are informative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61744:2001 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 61315      NOTE: Harmonized as EN 61315:1997 (not modified).
__________
- 3 - «Field32»
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
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 60050-731 1991 International Electrotechnical --
Vocabulary (IEV)
Chapter 731: Optical fibre
communication
IEC 60793-1-1 1995 Optical fibres --
Part 1: Generic specification -- Section
1: General
IEC 60825-1 1993 Safety of laser products EN 60825-1 1994
Part 1: Equipment classification, + February 1995
requirements and user's guide + A11 1996
1)
IEC 62129 Calibration of optical spectrum --
analyzers
ISO 9000 Series Quality management and quality EN ISO 9000 Series
assurance standards - Part 1:
Guidelines for selection and use
ISO 10012-1 1992 Quality assurance requirements for--
measuring equipment
Part 1: Metrological confirmation system
for measuring equipment
ISO 10012-2 1997 Part 2: Guidelines for control of --
measurement processes
ISO 1993 Guide to the Expression of Uncertainty--
in Measurement (ISBN 02-67-10188-9)
2)
EN 45001 1989 General criteria for the operation of--
testing laboratories
1)
To be published.
2)
EN 45001:1989 is superseded by EN ISO/IEC 17025:2000.

INTERNATIONAL IEC
STANDARD
First edition
2001-02
Calibration of fibre optic chromatic
dispersion test sets
Etalonnage des ensembles d'essai de la dispersion
chromatique des fibres optiques
 IEC 2001  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http://www.iec.ch
Commission Electrotechnique Internationale
PRICE CODE
X
International Electrotechnical Commission
For price, see current catalogue

– 2 – 61744  IEC:2001(E)
CONTENTS
Page
FOREWORD . 4
INTRODUCTION .5
Clause
1 Scope . 7
2 Normative references . 7
3 Terms and definitions. 8
4 Calibration . 14
4.1 Rationale for calibration of CD test sets. 14
4.1.1 (Full) calibration . 14
4.1.2 Calibration checking . 14
4.2 Preparation for calibration . 15
4.2.1 General advice and organization. 15
4.2.2 Test environmental requirements. 16
4.2.3 Measurement equipment requirements . 16
4.2.4 Traceability . 16
4.3 Calibration procedure. 16
4.4 Calibration checking procedure . 17
5 Wavelength calibration procedure. 17
5.1 General. 17
5.2 Discrete sources . 17
5.3 Tunable sources . 18
5.3.1 Method A . 18
5.3.2 Method B . 19
5.3.3 Method C . 20
5.4 Uncertainties and reporting . 20
6 Delay [dispersion] calibration procedure . 20
6.1 General. 20
6.2 Equipment and preparation . 20
6.2.1 Pulse delay CD test sets. 21
6.2.2 Phase shift CD test sets . 22
6.2.3 Interferometric CD test sets. 22
6.2.4 Differential phase shift CD test sets. 22
6.3 Calibration procedure. 23
6.4 Uncertainties and reporting . 23
7 Calibration checking procedure . 23
7.1 General. 23
7.2 Equipment and preparation . 24
7.3 Procedure . 24
7.4 Uncertainties and reporting . 25
7.5 Generation of infant reference fibre . 25
8 Documentation. 26
8.1 Specifications, measurement data and uncertainties. 26
8.2 Traceability information . 27

61744  IEC:2000(E) – 3 –
Annex A (normative) Mathematical basis. 28
A.1 Deviations. 28
A.2 Uncertainties type A . 28
A.3 Uncertainties type B . 29
A.4 Accumulation of uncertainties. 30
A.5 Reporting . 31
Annex B (normative) Assessment of operational uncertainties. 32
B.1 Wavelength calibration uncertainties . 32
B.2 Fibre length uncertainty. 33
B.3 Optical delay variation . 33
B.4 Instrumentation uncertainties.34
B.5 Effect of dispersion modelling. 37
B.6 Fibre related uncertainties. 37
B.7 System dispersion uncertainties . 38
Annex C (informative) Chromatic dispersion. 39
C.1 Chromatic dispersion in fibres . 39
C.2 Description of chromatic dispersion test sets . 39
C.3 Measurement techniques.40
C.4 Fibre chromatic dispersion specifications . 41
Annex D (informative) CD test set calibration compensation. 42
D.1 Calibration compensation . 42
D.2 Calibrated reference fibres . 43
D.3 Calibration compensation procedure. 43
Bibliography . 45

– 4 – 61744  IEC:2001(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CALIBRATION OF FIBRE OPTIC CHROMATIC
DISPERSION TEST SETS
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 inter
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