IEC 61977:2020

Fibre optic interconnecting devices and passive components - Fibre optic fixed filters - Generic specification

IEC 61977:2020 applies to the family of fibre optic filters. These components have all of the following general features:
- they are passive for the reason that they contain no optoelectronic or other transducing elements which can process the optical signal launched into the input port;
- they modify the spectral intensity distribution in order to select some wavelengths and inhibit others;
- they are fixed, i.e. the modification of the spectral intensity distribution is fixed and cannot be tuned;
- they have input and output ports or a common port (having both functions of input and output) for the transmission of optical power; the ports are optical fibre or optical fibre connectors;
- they differ according to their characteristics. They can be divided into the following categories:
- short-wave pass (only wavelengths lower than or equal to a specified value are passed);
- long-wave pass (only wavelengths greater than or equal to a specified value are passed);
- band-pass (only an optical window is allowed);
- notch (only an optical window is inhibited);
- gain flattening (compensating the spectral profile of the device).
It is also possible to have a combination of the above categories. This document provides the generic information including terminology of IEC 61753-04x series documents. Published IEC 61753-04x series documents are listed in the Bibliography. This document establishes uniform requirements for optical, mechanical and environmental properties. This fourth edition cancels and replaces the third edition published in 2015. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- change of the title and the scope for the limitation to fibre optic fixed filters;
- addition of new terms and definitions reflecting new title;
- removal of terms and definitions duplicated in IEC TS 62627-09;
- harmonization of the vertical axis of Figures 1 to 5;
- restructuration of Clause 4 reflecting the latest technical and market situation.

Dispositifs d'interconnexion et composants passifs fibroniques - Filtres fibroniques fixes - Spécification générique

IEC 61977:2020 s’applique à la famille des filtres fibroniques. Ces composants possèdent l’ensemble des caractéristiques générales suivantes:
- ils sont passifs du fait qu’ils ne contiennent aucun élément optoélectronique ou autres éléments transducteurs susceptibles de traiter le signal optique injecté dans le port d’entrée;
- ils modifient la distribution d’intensité spectrale afin de sélectionner certaines longueurs d’onde et en interdire d’autres;
- ils sont fixes, c’est-à-dire que la modification de la distribution de l’intensité spectrale est constante et ne peut donc être accordée;
- ils comportent des ports d’entrée et de sortie ou un port commun (comportant à la fois les fonctions d’entrée et de sortie) pour la transmission de la puissance optique; les ports sont une fibre optique ou des connecteurs à fibres optiques;
- ils diffèrent en fonction de leurs caractéristiques. Ils peuvent être répartis dans les catégories suivantes:
- passe-bas (seules les longueurs d’onde inférieures ou égales à une valeur spécifiée sont transmises);
- passe-haut (seules les longueurs d’onde supérieures ou égales à une valeur spécifiée sont transmises);
- passe-bande (seule une fenêtre optique est autorisée);
- coupe-bande (seule une fenêtre optique est interdite);
- aplanissement de gain (compensation du profil spectral du dispositif).
Une combinaison des catégories ci-dessus est également possible. Le présent document fournit des informations génériques et notamment la terminologie des documents de la série IEC 61753-04x. Les documents publiés de la série IEC 61753-04x sont indiqués dans la Bibliographie.AnchorAnchorAnchorAnchorAnchor Le présent document établit des exigences uniformes pour les propriétés optiques, mécaniques et environnementales. Cette quatrième édition annule et remplace la troisième édition parue en 2015 dont elle constitue une révision technique. La présente édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- modification du titre et du domaine d'application pour limiter le présent document aux filtres fibroniques fixes;
- introduction de nouveaux termes et définitions pour refléter le nouveau titre;
- suppression des termes et définitions présents dans l'IEC TS 62627-09;
- harmonisation de l'axe vertical des Figures 1 à 5;
- restructuration de l'Article 4 pour refléter les dernières situations techniques et du marché.

General Information

• Status: Published
• Publication Date: 08-Apr-2020
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 33.180.20 - Fibre optic interconnecting devices
• Technical Committee: SC 86B - Fibre optic interconnecting devices and passive components
• Drafting Committee: WG 7 - TC 86/SC 86B/WG 7
• Current Stage: PPUB - Publication issued
• Start Date: 08-May-2020
• Completion Date: 09-Apr-2020

Relations

• Revises: IEC 61977:2015 - Fibre optic interconnecting devices and passive components - Fibre optic filters - Generic specification
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61977 ®
Edition 4.0 2020-04
REDLINE VERSION
colour
inside
Fibre optic interconnecting devices and passive components – Fibre optic fixed
filters – Generic specification

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 Tel.: [phone]
3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
Switzerland
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 corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished

Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.

need further assistance, please contact the Customer Service

Centre: [e-mail].
IEC 61977 ®
Edition 4.0 2020-04
REDLINE VERSION
colour
inside
Fibre optic interconnecting devices and passive components – Fibre optic fixed

filters – Generic specification

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.20 ISBN 978-2-8322-8186-4

– 2 – IEC 61977:2020 RLV © IEC 2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
Basic terms .
3.1 Component terms. 8
3.2 Performance terms . 10
4 Requirements . 14
4.1 Classification . 14
4.1.1 General . 14
4.1.2 Technology and function Type . 15
4.1.3 Interface style . 16
Variant . 14
Normative reference extensions. 14
4.2 Documentation . 18
4.2.1 Symbols . 18
Specification system .
4.2.2 Drawings . 19
4.2.3 Tests and measurements . 19
4.2.4 Test report . 20
4.2.5 Instructions for use . 20
4.3 Standardisation system . 20
4.3.1 Interface standards . 20
4.3.2 Performance standards . 21
4.3.3 Reliability standards . 21
Interlinking .
4.4 Design and construction . 24
4.4.1 Materials . 24
4.4.2 Workmanship . 24
4.5 Quality . 24
4.6 Performance requirements . 24
4.7 Identification and marking . 24
4.7.1 General . 24
Variant identification number .
4.7.2 Component marking . 24
4.7.3 Package marking . 25
4.8 Packaging . 25
4.9 Storage conditions . 25
4.10 Safety . 25
Annex A (informative) Example of etalon filter technology . 27
A.1 Operating principle of etalon filter . 27
A.2 Transmission characteristics of etalon filter . 28
Annex B (informative) Example of fibre Bragg grating (FBG) filter technology . 29
B.1 Operating principle of FBG . 29
B.2 Example of usage of an FBG . 30

Annex C (informative) Example of thin film filter technology . 31
C.1 Example of thin film filter technology . 31
C.2 Example of application of thin film filters . 31
Annex D (informative) Examples of interface style . 33
Bibliography . 34
Figure 1 – Illustration of passband ripple . 11
Figure 2 – Illustration of a stopband . 12
Figure 3 – Illustration of maximum insertion loss within a passband . 13
Figure 4 – Illustration of minimum insertion loss within a passband . 13
Figure 5 – Illustration of X dB bandwidth . 14
Figure 6 – Optic filter style configurations .
Figure 7 – Standards currently under preparation .
Figure A.1 – Schematic diagram of an etalon . 27
Figure A.2 – Transmission characteristic of an etalon . 28
Figure B.1 – Technology of a fibre Bragg grating . 29
Figure B.2 – Application of an optical add/drop module . 30
Figure B.3 – Application of an OTDR sensor . 30
Figure B.4 – Application of the wavelength stabilizer for a 980 nm pump LD . 30
Figure C.1 – Structure of a multilayer thin-film . 31
Figure C.2 – Application for a GFF for an optical fibre amplifier . 32
Figure C.3 – Application for a BPF for an optical fibre amplifier . 32
Figure D.1 – Examples of interface style for fibre optic fixed filters . 33

Table 1 – Example of a typical fibre optic fixed filter classification . 15
Table 2 – The IEC specification structure .
Table 3 – Standards interlink matrix .
Table 4 – Quality assurance options .

– 4 – IEC 61977:2020 RLV © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
FIBRE OPTIC FIXED FILTERS – GENERIC SPECIFICATION

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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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 includi
...

IEC 61977 ®
Edition 4.0 2020-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Fibre optic fixed
filters – Generic specification

Dispositifs d’interconnexion et composants passifs fibroniques – Filtres
fibroniques fixes – Spécification générique

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 l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: [phone]
3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
Switzerland
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 corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and once 67 000 electrotechnical terminology entries in English and
a month by email. French extracted from the Terms and Definitions clause of IEC
publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or need CISPR.

further assistance, please contact the Customer Service

Centre: [e-mail].
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) 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 IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Recherche de publications IEC - Le premier dictionnaire d'électrotechnologie en ligne au monde,
webstore.iec.ch/advsearchform avec plus de 22 000 articles terminologiques en anglais et en
La recherche avancée permet de trouver des publications IEC français, ainsi que les termes équivalents dans 16 langues
en utilisant différents critères (numéro de référence, texte, additionnelles. Egalement appelé Vocabulaire
comité d’études,…). Elle donne aussi des informations sur les Electrotechnique International (IEV) en ligne.

projets et les publications remplacées ou retirées.
Glossaire IEC - std.iec.ch/glossary
IEC Just Published - webstore.iec.ch/justpublished 67 000 entrées terminologiques électrotechniques, en anglais
Restez informé sur les nouvelles publications IEC. Just et en français, extraites des articles Termes et Définitions des
Published détaille les nouvelles publications parues. publications IEC parues depuis 2002. Plus certaines entrées
Disponible en ligne et une fois par mois par email. antérieures extraites des publications des CE 37, 77, 86 et
CISPR de l'IEC.
Service Clients - webstore.iec.ch/csc
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
[e-mail].
Electropedia - www.electropedia.org

IEC 61977 ®
Edition 4.0 2020-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Fibre optic fixed

filters – Generic specification

Dispositifs d’interconnexion et composants passifs fibroniques – Filtres

fibroniques fixes – Spécification générique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.20 ISBN 978-2-8322-8110-9

– 2 – IEC 61977:2020 © IEC 2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
3.1 Component terms. 8
3.2 Performance terms . 10
4 Requirements . 14
4.1 Classification . 14
4.1.1 General . 14
4.1.2 Technology and function type . 15
4.1.3 Interface style . 15
4.2 Documentation . 15
4.2.1 Symbols . 15
4.2.2 Drawings . 15
4.2.3 Tests and measurements . 16
4.2.4 Test report . 16
4.2.5 Instructions for use . 16
4.3 Standardisation system . 16
4.3.1 Interface standards . 16
4.3.2 Performance standards . 16
4.3.3 Reliability standards . 16
4.4 Design and construction . 17
4.4.1 Materials . 17
4.4.2 Workmanship . 17
4.5 Quality . 17
4.6 Performance requirements . 17
4.7 Identification and marking . 17
4.7.1 General . 17
4.7.2 Component marking . 17
4.7.3 Package marking . 17
4.8 Packaging . 18
4.9 Storage conditions . 18
4.10 Safety . 18
Annex A (informative)  Example of etalon filter technology . 19
A.1 Operating principle of etalon filter . 19
A.2 Transmission characteristics of etalon filter . 20
Annex B (informative) Example of fibre Bragg grating (FBG) filter technology . 21
B.1 Operating principle of FBG . 21
B.2 Example of usage of an FBG . 22
Annex C (informative) Example of thin film filter technology . 23
C.1 Example of thin film filter technology . 23
C.2 Example of application of thin film filters . 23
Annex D (informative) Examples of interface style . 25
Bibliography . 26

Figure 1 – Illustration of passband ripple . 11
Figure 2 – Illustration of a stopband . 12
Figure 3 – Illustration of maximum insertion loss within a passband . 12
Figure 4 – Illustration of minimum insertion loss within a passband . 13
Figure 5 – Illustration of X dB bandwidth . 14
Figure A.1 – Schematic diagram of an etalon . 19
Figure A.2 – Transmission characteristic of an etalon . 20
Figure B.1 – Technology of a fibre Bragg grating . 21
Figure B.2 – Application of an optical add/drop module . 22
Figure B.3 – Application of an OTDR sensor . 22
Figure B.4 – Application of the wavelength stabilizer for a 980 nm pump LD . 22
Figure C.1 – Structure of a multilayer thin-film . 23
Figure C.2 – Application for a GFF for an optical fibre amplifier . 24
Figure C.3 – Application for a BPF for an optical fibre amplifier . 24
Figure D.1 – Examples of interface style for fibre optic fixed filters . 25

Table 1 – Example of a typical fibre optic fixed filter classification . 14

– 4 – IEC 61977:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
FIBRE OPTIC FIXED FILTERS – GENERIC SPECIFICATION

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
...