IEC 60793-1-42:2007

Optical fibres - Part 1-42: Measurement methods and test procedures - Chromatic dispersion

Four methods are described for measuring chromatic dispersion: (a) phase shift, (b) spectral group delay in the time domain, (c) differential phase shift, and (d) interferometry. Methods A, B, and C apply to the measurement of chromatic dispersion of the following fibres over a specified wavelength range: class A1 graded-index multimode fibres; category A4f, A4g and A4h multimode fibres; and class B single-mode fibres (all categories). Method D applies to the measurement of chromatic dispersion values of single-mode fibres categories B1, B2, B4 and B5 over the 1 000 nm to 1 700 nm wavelength range. The main changes in this second edition concern the addition of a new Annex E on chromatic dispersion fitting and the applicability to A4 fibres.

Fibres optiques - Partie 1-42: Méthodes de mesure et procédures d'essai - Dispersion chromatique

Le présent document donne quatre méthodes relatives à la mesure de la dispersion chromatique: méthode A: déphasage; méthode B: temps de propagation de groupe spectral dans le domaine temporel; méthode C: déphasage différentiel; et méthode D: interférométrie. Les méthodes A, B et C s'appliquent à la mesure de la dispersion chromatique des fibres suivantes dans la plage de longueurs d'ondes spécifiée: fibres multimodales à gradient d'indice de classe A1; fibres multimodales de catégories A4f, A4g et A4h; et fibres unimodales de classe B (toutes catégories). La méthode D s'applique à la mesure des valeurs de la dispersion chromatique des fibres unimodales de catégories B1, B2, B4 et B5 dans la plage de longueurs d'ondes de 1 000 nm à 1 700 nm. Les changements principaux de cette deuxième édition concernent l'addition d'une nouvelle Annexe E sur la modélisation de la dispersion chromatique et sur l'applicabilité aux fibres A4.

General Information

• Status: Published
• Publication Date: 23-Apr-2007
• ICS: 33.180.10 - Fibres and cables
• Technical Committee: SC 86A - Fibres and cables
• Drafting Committee: WG 1 - TC 86/SC 86A/WG 1
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 24-Jan-2013

Relations

• Corrected By: IEC 60793-1-42:2007/COR1:2007 - Corrigendum 1 - Optical fibres - Part 1-42: Measurement methods and test procedures - Chromatic dispersion
• Effective Date: 05-Sep-2023
• Revised: IEC 60793-1-42:2013 - Optical fibres - Part 1-42: Measurement methods and test procedures - Chromatic dispersion
• Effective Date: 05-Sep-2023
• Revises: IEC 60793-1-42:2001 - Optical fibres - Part 1-42: Measurement methods and test procedures - Chromatic dispersion
• Effective Date: 05-Sep-2023

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD 60793-1-42
Second edition
2007-04
Optical fibres –
Part 1-42:
Measurement methods and test procedures –
Chromatic dispersion
Reference number
All rights reserved. Unless otherwise specified, 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
either IEC or IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: [e-mail]
Web: www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
ƒ Catalogue of IEC publications: www.iec.ch/searchpub
The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,…).
It also gives information on projects, withdrawn and replaced publications.
ƒ IEC Just Published: www.iec.ch/online_news/justpub
Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available
on-line and also by email.
ƒ Customer Service Centre: www.iec.ch/webstore/custserv
If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service
Centre FAQ or contact us:
Email:
[e-mail]
Tel.: [phone]
Fax: [phone]
INTERNATIONAL IEC
STANDARD 60793-1-42
Second edition
2007-04
Optical fibres –
Part 1-42:
Measurement methods and test procedures –
Chromatic dispersion
PRICE CODE
Commission Electrotechnique Internationale V
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

– 2 – 60793-1-42 © IEC:2007(E)

CONTENTS
FOREWORD.4

1 Scope and object.6

2 Normative references .7

3 Overview of methods .7

3.1 Method A, phase shift.7

3.2 Method B, spectral group delay in the time domain.7
3.3 Method C, differential phase shift .7
3.4 Method D, interferometry.8
4 Reference test methods.8
4.1 Category A1 and category A4f, A4g and A4h multimode fibres .8
4.2 Class B single-mode fibres .8
5 Apparatus.8
5.1 Launch optics.8
5.2 High-order mode filter (single-mode) .8
5.3 Input positioning apparatus .9
5.4 Output positioning apparatus.9
5.5 Computation equipment.9
6 Sampling and specimens.9
6.1 Specimen length.9
6.2 Specimen end face.9
6.3 Reference fibre .9
7 Procedure .9
8 Calculations .10
8.1 Category A1 and A4f, A4g, A4h multimode and B1.1 and B1.3 single-mode
fibres.10
8.2 Category B1.2 single-mode fibres.10
8.3 Category B2 single-mode fibres.10
8.4 Category B4 and B5 single-mode fibres.11
9 Results .11
10 Specification information .12

Annex A (normative) Requirements specific to method A, phase-shift .13
Annex B (normative) Requirements specific to method B, spectral group delay in the
time domain .18
Annex C (normative) Requirements specific to method C, differential phase-shift .22
Annex D (normative) Requirements specific to method D, interferometry .27
Annex E (normative) Chromatic dispersion fitting.31

Figure A.1 – Chromatic dispersion measurement set, multiple laser system (typical) .14
Figure A.2 – Typical delay and dispersion curves.14
Figure A.3 – Chromatic dispersion measurement set, LED system (typical) .16
Figure B.1 – Block diagram, fibre Raman laser system .19
Figure B.2 – Block diagram, multiple laser diode system.19

60793-1-42 © IEC:2007(E) – 3 –

Figure C.1 – Chromatic differential phase dispersion measurement set, multiple laser

system .23

Figure C.2 – Chromatic differential phase dispersion measurement set, LED system .24

Figure C.3 – Chromatic dispersion measurement set, differential phase by dual

wavelength method.24

Figure C.4 – Chromatic dispersion measurement set, differential phase by double

demodulation .25

Figure D.1 – Fibre chromatic dispersion test set -Interferometry by fiber reference path .29

Figure D.2 – Fibre chromatic dispersion test set -Interferometry by air reference path .29

Figure D.3 – Examples of delay data .30

Table E.1 – Definition of fit types and fit coefficients; equations for group delay and
dispersion coefficient .31
Table E.2 – Slope equations .31
Table E.3 – Zero-dispersion wavelength and slope equations .32

– 4 – 60793-1-42 © IEC:2007(E)

INTERNATIONAL ELECTROTECHNICAL COMMISSION

________
OPTICAL FIBRES –
Part 1-42: Measurement methods and test procedures –

Chromatic dispersion
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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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 60793-1-42 has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee 86: Fibre optics.
This second edition cancels and replaces the first edition published in 2001. It constitutes a
technical revision. The main changes in this second edition concern the addition of a new
Annex E on chromatic dispersion fitting and the applicability to A4 fibres.
This standard is to be read in conjunction with IEC 60793-1.
The text of this standard is based on the following documents:
FDIS Report on voting
86A/1136/FDIS 86A/1146/RVD
Full information on the voting for the approval of this part can be found in the report on voting
indicated in the above table.
60793-1-42 © IEC:2007(E) – 5 –

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

The list of all parts of the IEC 60793 series, under the general title Optical fibres, can be

found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until

the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in

the data related to the specific publication. At this date, the publication will be

• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
A bilingual version of this publication will be issued at a later date.
The contents of the corrigendum of June 2007 have been included in this copy.

– 6 – 60793-1-42 © IEC:2007(E)

OPTICAL FIBRES –
Part 1-42: Measurement methods and test procedures –

Chromatic dispersion
1 Scope
This part of IEC 60793 establishes uniform requirements for measuring the chromatic
dispersion of optical fibre, thereby assisting in the inspection of fibres and cables for
commercial purposes.
Chromatic dispersion varies with wavelength. Some methods and implementations measure
the group delay as a function of wavelength and the chromatic dispersion and dispersion
slope are deduced from the derivatives (with respect to wavelength) of this data. This
differentiation is most often done after the data are fitted to a mathematical model. Other
implementations can all
...

IEC 60793-1-42
Edition 2.0 2007-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Optical fibres –
Part 1-42: Measurement methods and test procedures – Chromatic dispersion

Fibres optiques –
Partie 1-42: Méthodes de mesure et procédures d’essai – Dispersion
chromatique
All rights reserved. Unless otherwise specified, 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 either IEC or
IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de la CEI ou du Comité national de la CEI du pays du demandeur.
Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette
publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: [e-mail]
Web: www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
ƒ Catalogue of IEC publications: www.iec.ch/searchpub
The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,…).
It also gives information on projects, withdrawn and replaced publications.
ƒ IEC Just Published: www.iec.ch/online_news/justpub
Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available
on-line and also by email.
ƒ Electropedia: www.electropedia.org
The world's leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions
in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical
Vocabulary online.
ƒ Customer Service Centre: www.iec.ch/webstore/custserv
If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service
Centre FAQ or contact us:
Email: [e-mail]
Tel.: [phone]
Fax: [phone]
A propos de la CEI
La Commission Electrotechnique Internationale (CEI) est la première organisation mondiale qui élabore et publie des
normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications CEI
Le contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possédez
l’édition la plus récente, un corrigendum ou amendement peut avoir été publié.
ƒ Catalogue des publications de la CEI: www.iec.ch/searchpub/cur_fut-f.htm
Le Catalogue en-ligne de la CEI vous permet d’effectuer des recherches en utilisant différents critères (numéro de référence,
texte, comité d’études,…). Il donne aussi des informations sur les projets et les publications retirées ou remplacées.
ƒ Just Published CEI: www.iec.ch/online_news/justpub
Restez informé sur les nouvelles publications de la CEI. Just Published détaille deux fois par mois les nouvelles
publications parues. Disponible en-ligne et aussi par email.
ƒ Electropedia: www.electropedia.org
Le premier dictionnaire en ligne au monde de termes électroniques et électriques. Il contient plus de 20 000 termes et
définitions en anglais et en français, ainsi que les termes équivalents dans les langues additionnelles. Egalement appelé
Vocabulaire Electrotechnique International en ligne.
ƒ Service Clients: www.iec.ch/webstore/custserv/custserv_entry-f.htm
Si vous désirez nous donner des commentaires sur cette publication ou si vous avez des questions, visitez le FAQ du
Service clients ou contactez-nous:
Email: [e-mail]
Tél.: [phone]
Fax: [phone]
IEC 60793-1-42
Edition 2.0 2007-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Optical fibres –
Part 1-42: Measurement methods and test procedures – Chromatic dispersion

Fibres optiques –
Partie 1-42: Méthodes de mesure et procédures d’essai – Dispersion
chromatique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
V
CODE PRIX
ICS 33.180.10 ISBN 2-8318-9204-X
– 2 – 60793-1-42 © IEC:2007
CONTENTS
FOREWORD.4

1 Scope.6
2 Normative references .7
3 Overview of methods .7
3.1 Method A, phase shift.7
3.2 Method B, spectral group delay in the time domain.7
3.3 Method C, differential phase shift .7
3.4 Method D, interferometry.8
4 Reference test methods.8
4.1 Category A1 and category A4f, A4g and A4h multimode fibres .8
4.2 Class B single-mode fibres .8
5 Apparatus.8
5.1 Launch optics.8
5.2 High-order mode filter (single-mode) .8
5.3 Input positioning apparatus .9
5.4 Output positioning apparatus.9
5.5 Computation equipment.9
6 Sampling and specimens.9
6.1 Specimen length.9
6.2 Specimen end face.9
6.3 Reference fibre .9
7 Procedure .9
8 Calculations .10
8.1 Category A1 and A4f, A4g, A4h multimode and B1.1 and B1.3 single-mode
fibres.10
8.2 Category B1.2 single-mode fibres.10
8.3 Category B2 single-mode fibres.10
8.4 Category B4 and B5 single-mode fibres.11
9 Results .11
10 Specification information .11

Annex A (normative) Requirements specific to method A, phase-shift .12
Annex B (normative) Requirements specific to method B, spectral group delay in the
time domain .17
Annex C (normative) Requirements specific to method C, differential phase-shift .21
Annex D (normative) Requirements specific to method D, interferometry .26
Annex E (normative) Chromatic dispersion fitting.30

Figure A.1 – Chromatic dispersion measurement set, multiple laser system (typical) .13
Figure A.2 – Typical delay and dispersion curves.13
Figure A.3 – Chromatic dispersion measurement set, LED system (typical) .15
Figure B.1 – Block diagram, fibre Raman laser system .18
Figure B.2 – Block diagram, multiple laser diode system.18

60793-1-42 © IEC:2007 – 3 –
Figure C.1 – Chromatic differential phase dispersion measurement set, multiple laser
system .22
Figure C.2 – Chromatic differential phase dispersion measurement set, LED system .23
Figure C.3 – Chromatic dispersion measurement set, differential phase by dual
wavelength method.23
Figure C.4 – Chromatic dispersion measurement set, differential phase by double
demodulation .24
Figure D.1 – Fibre chromatic dispersion test set – Interferometry by fibre reference
path .28
Figure D.2 – Fibre chromatic dispersion test set – Interferometry by air reference path.28
Figure D.3 – Examples of delay data .29

Table E.1 – Definition of fit types and fit coefficients; equations for group delay and
dispersion coefficient .30
Table E.2 – Slope equations .30
Table E.3 – Zero-dispersion wavelength and slope equations .31

– 4 – 60793-1-42 © IEC:2007
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
OPTICAL FIBRES –
Part 1-42: Measurement methods and test procedures –
Chromatic dispersion
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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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 arisi
...