EN IEC 61977:2020

SLOVENSKI STANDARD
01-september-2020
Nadomešča:
SIST EN 61977:2016
Optični spojni elementi in pasivne komponente - Fiksni filtri za optična vlakna -
Splošna specifikacija (IEC 61977:2020)
Fibre optic interconnecting devices and passive components - Fibre optic fixed filters -
Generic specification (IEC 61977:2020)
Lichtwellenleiter - Verbindungselemente und passive Bauteile - Feste
Lichtwellenleiterfilter - Fachgrundspezifikation (IEC 61977:2020)
Dispositifs d'interconnexion et composants passifs fibroniques - Filtres fibroniques -
Spécification générique (IEC 61977:2020)
Ta slovenski standard je istoveten z: EN IEC 61977:2020
ICS:
33.180.20 Povezovalne naprave za Fibre optic interconnecting
optična vlakna devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61977

NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2020
ICS 33.180.20 Supersedes EN 61977:2015 and all of its amendments
and corrigenda (if any)
English Version
Fibre optic interconnecting devices and passive components -
Fibre optic fixed filters - Generic specification
(IEC 61977:2020)
Dispositifs d'interconnexion et composants passifs Lichtwellenleiter - Verbindungselemente und passive
fibroniques - Filtres fibroniques fixes - Spécification Bauteile - Feste Lichtwellenleiterfilter -
générique Fachgrundspezifikation
(IEC 61977:2020) (IEC 61977:2020)
This European Standard was approved by CENELEC on 2020-05-14. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61977:2020 E
European foreword
The text of document 86B/4267/FDIS, future edition 4 of IEC 61977, prepared by SC 86B "Fibre optic
interconnecting devices and passive components" of IEC/TC 86 "Fibre optics" was submitted to the
IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 61977:2020.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-02-14
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-05-14
document have to be withdrawn
This document supersedes EN 61977:2015 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 61977:2020 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 60027 (series) NOTE Harmonized as EN 60027 (series)
IEC 60825 (series) NOTE Harmonized as EN 60825 (series)
IEC 61300 (series) NOTE Harmonized as EN 61300 (series)
ISO 129-1 NOTE Harmonized as EN ISO 129-1
ISO 286-1 NOTE Harmonized as EN ISO 286-1
ISO 1101 NOTE Harmonized as EN ISO 1101

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60027 series Letters symbols to be used in electrical - -
technology
IEC 60050-731 - International Electrotechnical Vocabulary - - -
Chapter 731: Optical fibre communication
IEC 60617 - Standard data element types with associated - -
classification scheme for electric components -
Part 4: IEC reference collection fo standard data
element types and component classes
IEC 60825 series Safety of laser products - -
IEC 61300 series Fibre optic interconnecting devices and passive - -
components - Basic test and measurement
procedures
IEC/TR 61930 - Fibre optic graphical symbology - -
IEC/TS 62627-09 - Fibre optic interconnecting devices and passive - -
components - Vocabulary for passive optical
devices
ISO 129-1 - Technical product documentation (TPD) - EN ISO 129-1 -
Presentation of dimensions and tolerances -
Part 1: General principles
ISO 286-1 - Geometrical product specifications (GPS) - ISO EN ISO 286-1 -
code system for tolerances on linear sizes - Part
1: Basis of tolerances, deviations and fits
ISO 1101 - Geometrical product specifications (GPS) - EN ISO 1101 -
Geometrical tolerancing - Tolerances of form,
orientation, location and run-out
ISO 8601-1 - Date and time - Representations for information - -
interchange - Part 1: Basic rules

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

IEC 61977:2020 © IEC 2020 – 3 –
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 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 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 61977 has been prepared by subcommittee SC 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee TC 86: Fibre
optics.
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:
a) change of the title and the scope for the limitation to fibre optic fixed filters;
b) addition of new terms and definitions reflecting new title;
c) removal of terms and definitions duplicated in IEC TS 62627-09;
d) harmonization of the vertical axis of Figures 1 to 5;
e) restructuration of Clause 4 reflecting the latest technical and market situation.

IEC 61977:2020 © IEC 2020 – 5 –
The text of this International Standard is based on the following documents:
FDIS Report on voting
86B/4267/FDIS 86B/4286/RVD
Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 6 – IEC 61977:2020 © IEC 2020
INTRODUCTION
There are two generic specifications for fibre optic filters: fibre optic fixed filters and fibre optic
tuneable filters. This document focuses on fibre optic fixed filters. Fibre optic tuneable bandpass
filter is standardized in IEC 63032.

IEC 61977:2020 © IEC 2020 – 7 –
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
FIBRE OPTIC FIXED FILTERS – GENERIC SPECIFICATION

1 Scope
This document 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.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
IEC 60027 (all parts), Letter symbols to be used in electrical technology
IEC 60050-731, International Electrotechnical Vocabulary (IEV) – Part 731: Optical fibre
communication (available at http://www.electropedia.org)
IEC 60617, Graphical symbols for diagrams (available at http://std.iec.ch/iec60617)
IEC 60825 (all parts), Safety of laser products

– 8 – IEC 61977:2020 © IEC 2020
IEC 61300 (all parts), Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures
IEC TR 61930, Fibre optic graphical symbology
IEC TS 62627-09, Fibre optic interconnecting devices and passive components – Vocabulary
for passive optical devices
ISO 129-1, Technical product documentation (TPD) – Presentation of dimensions and
tolerances – Part 1: General principles
ISO 286-1, Geometrical product specifications (GPS) – ISO code system for tolerances on
linear sizes – Part 1: Basis of tolerances, deviations and fits
ISO 1101, Geometrical product specifications (GPS) – Geometrical tolerancing – Tolerances of
form, orientation, location and run-out
ISO 8601-1, Date and time – Representations for information interchange – Part 1: Basic rules
3 Terms and definitions
For the purpose of this document, terms and definitions given in IEC 60050-731,
IEC TS 62627-09 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1 Component terms
3.1.1
bandpass filter
BPF
fibre optic filter designed to allow signals between two specific wavelengths to pass
Note 1 to entry: This note applies to the French language only.
3.1.2
etalon
device consisting of a transparent plane-parallel plate with two reflecting surfaces, or two
parallel reflecting mirrors
Note 1 to entry: The varying transmission function of an etalon is caused by interfe
...