IEC 61744:2001

Calibration of fibre optic chromatic dispersion test sets

Defines standard procedures for calibrating optical fibre chromatic dispersion test sets. The procedures apply to calibration laboratories, and to manufacturers and users of CD test sets, for: (a) calibrating CD test sets, (b) setting specifications of CD test sets, (c) extending the calibration period of an already calibrated CD test set. It applies to all CD test sets, except for multimode fibres.

General Information

• Status: Published
• Publication Date: 26-Feb-2001
• ICS: 33.180.01 - Fibre optic systems in general
• Technical Committee: TC 86 - Fibre optics
• Drafting Committee: WG 4 - TC 86/WG 4
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 27-Sep-2005

Relations

• Revised: IEC 61744:2005 - Calibration of fibre optic chromatic dispersion test sets
• Effective Date: 05-Sep-2023

Standards Content (Sample)

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

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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
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– 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 interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any divergence
between the IEC Standard and the corresponding national or regional standard shall be clearly indicated in the
latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61744 has been prepared by IEC technical committee 86: Fibre
optics.
The text of this standard is based on the following documents:
FDIS Report on voting
86/170/FDIS 86/173/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.
Annexes A and B form an integral part of this standard.
Annexes C and D are for information only.
The committee has decided that the contents of this publication will remain unchanged until
2002. At this date, the publication will be
reconfirmed;
withdrawn;
replaced by a revised edition, or
amended.
61744  IEC:2000(E) – 5 –
INTRODUCTION
Chromatic dispersion in optical fibres

Chromatic dispersion is the variation with optical light wavelength of the light propagation delay

time in a length of fibre. This variation can cause bandwidth limitation in the fibre when used to

transmit communication signals. For a more detailed explanation, refer to annex C and

IEC 60793-1-1.
Chromatic dispersion (CD) test sets

CD test sets are used to measure the chromatic dispersion properties of optical fibres and
typically comprise an optical source of known wavelength(s), a fibre light input coupling and
output coupling means, optical detection means, and elec
...