EN 61744:2005

SLOVENSKI STANDARD
01-marec-2006
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Calibration of fibre optic chromatic dispersion test sets
Kalibrierung von Prüfaufbauten zur Bestimmung der chromatischen Dispersion
Etalonnage des ensembles d'essai de la dispersion chromatique des fibres optiques
Ta slovenski standard je istoveten z: EN 61744:2005
ICS:
33.140 Posebna merilna oprema za Special measuring
uporabo v telekomunikacijah equipment for use in
telecommunications
33.180.01 6LVWHPL]RSWLþQLPLYODNQLQD Fibre optic systems in
VSORãQR general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 61744
NORME EUROPÉENNE
EUROPÄISCHE NORM December 2005

ICS 33.180.01 Supersedes EN 61744:2001

English version
Calibration of fibre optic chromatic dispersion test sets
(IEC 61744:2005)
Etalonnage des ensembles d'essai  Kalibrierung von Prüfaufbauten
de la dispersion chromatique zur Bestimmung der chromatischen
des fibres optiques Dispersion
(CEI 61744:2005) (IEC 61744:2005)

This European Standard was approved by CENELEC on 2005-09-01. 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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, 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

© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 61744:2005 E
Foreword
The text of document 86/236/FDIS, future edition 2 of IEC 61744, prepared by IEC TC 86, Fibre
optics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
EN 61744 on 2005-09-01.
This European Standard supersedes EN 61744:2001.
The principal change is the addition of reference to wavelength in vacuum. This reference is critical for
accurate production, measurement and sale of products in the emerging market applications of fibre
optics such as dense wavelength division multiplexing (DWDM) systems.
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) 2006-07-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2008-09-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61744:2005 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 61315 NOTE Harmonized as EN 61315:1997 (not modified).
IEC 61746 NOTE Harmonized as EN 61746:2005 (not modified).
IEC 60793-1-1 NOTE Harmonized as EN 60793-1-1:2003 (not modified).
ISO 9000 NOTE Harmonized in the EN ISO 9000 series (not modified).
ISO 10012 NOTE Harmonized as EN ISO 10012 (not modified).
__________
- 3 - EN 61744:2005
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 Where an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
1)
IEC 60050-731 - International Electrotechnical Vocabulary - -
(IEV)
Chapter 731: Optical fibre communication

1) 2)
IEC 60825-1 - Safety of laser products EN 60825-1 1994
Part 1: Equipment classification, + corr. February 1995
requirements and user's guide
3)
IEC 62129 - Calibration of optical spectrum analyzers- -

ISO 9000 Series Quality management and quality EN ISO 9000 Series
assurance standards
BIPM/IEC/IFCC/ 1995 Guide to the Expression of Uncertainty in - -
ISO/IUPAC/ Measurement (GUM)
IUPAP/OIML
1) 2)
ISO/IEC 17025 - General requirements for the competence EN ISO/IEC 2005
of testing and calibration laboratories 17025

1)
Undated reference.
2)
Valid edition at date of issue.
3)
At draft stage.
NORME CEI
INTERNATIONALE
IEC
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
2005-09
Etalonnage des ensembles d'essai
de la dispersion chromatique
des fibres optiques
Calibration of fibre optic chromatic
dispersion test sets
 IEC 2005 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
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Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
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Pour prix, voir catalogue en vigueur
For price, see current catalogue

61744  IEC:2005 – 3 –
CONTENTS
FOREWORD.7

0 Introduction.11
0.1 Chromatic dispersion in optical fibres.11
0.2 Chromatic dispersion (CD) test sets .11
0.3 Overview of calibration procedures described in this standard .11
1 Scope .15
2 Normative references.15
3 Terms and definitions.17
4 Calibration .29
4.1 Rationale for calibration of CD test sets .29
4.2 Preparation for calibration.33
4.3 Calibration procedure.35
4.4 Calibration checking procedure .37
5 Wavelength calibration procedure .37
5.1 General .37
5.2 Discrete sources.39
5.3 Tunable sources .39
5.4 Uncertainties and reporting .45
6 Delay [dispersion] calibration procedure .45
6.1 General .45
6.2 Equipment and preparation .45
6.3 Calibration procedure.49
6.4 Uncertainties and reporting .51
7 Calibration checking procedure .51
7.1 General .51
7.2 Equipment and preparation .53
7.3 Procedure.53
7.4 Uncertainties and reporting .55
7.5 Generation of infant reference fibre.55
8 Documentation.57
8.1 Specifications, measurement data and uncertainties .57
8.2 Traceability information.59

Annex A (normative) Mathematical basis .61
Annex B (normative) Assessment of operational uncertainties .71
Annex C (informative) Chromatic dispersion .87
Annex D (informative) CD test set calibration compensation .95
Annex E (informative) Vacuum and air wavelength.101

Bibliography .107

61744  IEC:2005 – 5 –
Figure 1 – Typical calibration chain for CD test sets.19
Figure 2 – Typical optical delay line artefact for CD test set delay calibration .47
Figure 3 – Typical differential delay [dispersion] simulator for CD test set calibration.49
Figure 4 – Reference fibre comparison .55
Figure 5 – Generation of a reference fibre .55
Figure A.1 – Deviation and uncertainty type B, and how to replace both by an
appropriately larger uncertainty .65
Figure C.1 – Schematic diagram of a CD test set.89
Figure E.1 – Dispersion and air and vacuum wavelength.103

61744  IEC:2005 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CALIBRATION OF FIBRE OPTIC CHROMATIC DISPERSION
TEST SETS
FOREWORD
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