EN IEC 61978-1:2024

Fibre optic interconnecting devices and passive components - Fibre optic passive chromatic dispersion compensators - Part 1: Generic specification

IEC 61978-1:2024 is available as IEC 61978-1:2024 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 61978-1:2024 applies to fibre optic passive chromatic dispersion compensators, all exhibiting the following features: - they are optically passive; - they have an optical input and an optical output for transmitting optical power; - the ports are optical fibres or optical fibre connectors; - they are wavelength sensitive; - they can be polarization sensitive. This document establishes uniform requirements for the passive chromatic dispersion compensator. This fourth edition cancels and replaces the third edition published in 2014. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) harmonization of terms and definitions with IEC TS 62627-09; b) change of Clause 4 regarding requirements.

Lichtwellenleiter - Verbindungselemente und passive Bauteile - Passive Lichtwellenleiter - Kompensatoren mit chromatischer Dispersion - Teil 1: Fachgrundspezifikation

Dispositifs d'interconnexion et composants passifs fibroniques - Compensateurs de dispersion chromatique passifs fibroniques - Partie 1 : Spécification générique

IEC 61978-1:2024 est disponible sous forme de IEC 61978-1:2024 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 61978-1:2024 s’applique aux compensateurs de dispersion chromatique passifs fibroniques qui présentent les caractéristiques suivantes: - ils sont passifs au niveau optique; - ils possèdent une entrée optique et une sortie optique pour la transmission de la puissance optique; - les ports sont des fibres optiques ou des connecteurs optiques; - ils sont sensibles aux longueurs d’onde; - i ls peuvent être sensibles à la polarisation. Le présent document établit des exigences uniformes pour les compensateurs de dispersion chromatique passifs. Cette quatrième édition annule et remplace la troisième édition parue en 2014. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente: a) harmonisation des termes et définitions avec l’IEC TS 62627-09; b) modification de l’Article 4 concernant les exigences.

Optični spojni elementi in pasivne komponente - Optični pasivni kompenzatorji barvne razpršenosti - 1. del: Splošna specifikacija (IEC 61978-1:2024)

Ta del standarda IEC 61978 se uporablja za optične pasivne kompenzatorje barvne razpršenosti z
naslednjimi lastnostmi:
– so optično pasivni;
– imajo optični vhod in optični izhod za prenos optične moči;
– vrata so optična vlakna ali optični konektorji;
– občutljivi so na valovno dolžino;
– lahko so občutljivi na polarizacijo.
Ta dokument določa enotne zahteve za pasivni kompenzator barvne
razpršenosti.

General Information

• Status: Published
• Publication Date: 30-May-2024
• ICS: 33.180.01 - Fibre optic systems in general
• Technical Committee: CLC/TC 86BXA - Fibre optic interconnect, passive and connectorised components
• Drafting Committee: IEC/SC 86B - IEC_SC_86B
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 31-May-2024
• Due Date: 30-Jun-2025
• Completion Date: 31-May-2024
• Ref Project: SIST EN IEC 61978-1:2024 - Fibre optic interconnecting devices and passive components - Fibre optic passive chromatic dispersion compensators - Part 1: Generic specification (IEC 61978-1:2024)

Relations

• Replaces: EN 61978-1:2014 - Fibre optic interconnecting devices and passive components - Fibre optic passive chromatic dispersion compensators - Part 1: Generic specification
• Effective Date: 13-Dec-2022

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2024
Optični spojni elementi in pasivne komponente - Optični pasivni kompenzatorji
barvne razpršenosti - 1. del: Splošna specifikacija (IEC 61978-1:2024)
Fibre optic interconnecting devices and passive components - Fibre optic passive
chromatic dispersion compensators - Part 1: Generic specification (IEC 61978-1:2024)
Lichtwellenleiter - Verbindungselemente und passive Bauteile - Passive Lichtwellenleiter
- Kompensatoren mit chromatischer Dispersion - Teil 1: Fachgrundspezifikation (IEC
61978-1:2024)
Dispositifs d'interconnexion et composants passifs à fibres optiques - Compensateurs de
dispersion chromatique passifs à fibres optiques - Partie 1: Spécification générique (IEC
61978-1:2024)
Ta slovenski standard je istoveten z: EN IEC 61978-1:2024
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 61978-1

NORME EUROPÉENNE
EUROPÄISCHE NORM May 2024
ICS 33.180.01 Supersedes EN 61978-1:2014
English Version
Fibre optic interconnecting devices and passive components -
Fibre optic passive chromatic dispersion compensators - Part 1:
Generic specification
(IEC 61978-1:2024)
Dispositifs d'interconnexion et composants passifs Lichtwellenleiter - Verbindungselemente und passive
fibroniques - Compensateurs de dispersion chromatique Bauteile - Passive Lichtwellenleiter - Kompensatoren mit
passifs fibroniques - Partie 1 : Spécification générique chromatischer Dispersion - Teil 1: Fachgrundspezifikation
(IEC 61978-1:2024) (IEC 61978-1:2024)
This European Standard was approved by CENELEC on 2024-05-20. 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,
Türkiye 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
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61978-1:2024 E

European foreword
The text of document 86B/4866/FDIS, future edition 4 of IEC 61978-1, 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 61978-1:2024.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2025-02-20
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2025-05-20
document have to be withdrawn
This document supersedes EN 61978-1:2014 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.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61978-1:2024 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 standard indicated:
IEC 60068 series NOTE Approved as EN 60068 series
IEC 60695-11-5 NOTE Approved as EN 60695-11-5
IEC 60793-2-50 NOTE Approved as EN IEC 60793-2-50
IEC 60869-1 NOTE Approved as EN IEC 60869-1
IEC 60974 series NOTE Approved as EN IEC 60974 series
IEC 61073-1 NOTE Approved as EN 61073-1
IEC 61300-1 NOTE Approved as EN IEC 61300-1
IEC 61300-2 series NOTE Approved as EN 61300-2 series
IEC 61300-3 series NOTE Approved as EN 61300-3 series
IEC 61300-3-38 NOTE Approved as EN 61300-3-38
IEC 61753 series NOTE Approved as EN 61753 series
IEC 61754 series NOTE Approved as EN 61754 series
IEC 61754-4 NOTE Approved as EN IEC 61754-4
IEC 61754-13 NOTE Approved as EN 61754-13
IEC 61754-15 NOTE Approved as EN 61754-15
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.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60027 series Letters symbols to be used in electrical EN IEC 60027 series
technology
IEC 60050-731 - International Electrotechnical Vocabulary - - -
Chapter 731: Optical fibre communication
IEC 60617 series Standard data element types with - -
associated classification scheme for
electric components
IEC 61300 series Fibre optic interconnecting devices and EN IEC 61300 series
passive components - Basic test and
measurement procedures
IEC 61753 series Fibre optic interconnecting devices and EN IEC 61753 series
passive components - Performance
standard
IEC/TR 61930 - Fibre optic graphical symbology - -
IEC 62005 series Reliability of fibre optic interconnecting EN IEC 62005 series
devices and passive components
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 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 61978-1 ®
Edition 4.0 2024-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Fibre optic

passive chromatic dispersion compensators –

Part 1: Generic specification
Dispositifs d'interconnexion et composants passifs fibroniques –

Compensateurs de dispersion chromatique passifs fibroniques –

Partie 1 : Spécification générique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.01  ISBN 978-2-8322-8702-6

– 2 – IEC 61978-1:2024 © IEC 2024
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
3.1 Component terms. 7
3.2 Performance terms . 8
4 Requirements . 10
4.1 Classification . 10
4.1.1 General . 10
4.1.2 Technology . 11
4.1.3 Types . 11
4.1.4 Wavelength band . 11
4.1.5 Application of PDCSs and their suitable technologies . 11
4.1.6 Interface style . 12
4.2 Documentation . 12
4.2.1 Symbols . 12
4.2.2 Drawings . 12
4.2.3 Tests and measurements . 12
4.2.4 Test report . 13
4.2.5 Instructions for use . 13
4.3 Standardisation system . 13
4.3.1 Interface standards . 13
4.3.2 Performance standards . 13
4.3.3 Reliability standards . 13
4.4 Design and construction . 14
4.4.1 Materials . 14
4.4.2 Workmanship . 14
4.5 Quality . 14
4.6 Performance requirements . 14
4.7 Identification and marking . 14
4.7.1 General . 14
4.7.2 Component marking . 14
4.7.3 Package marking . 15
4.8 Packaging . 15
4.9 Storage conditions . 15
4.10 Safety . 15
Annex A (informative) Example of dispersion compensating fibre (DCF) technologies . 16
Annex B (informative) Example of fibre Bragg grating (FBG) technologies . 18
Annex C (informative) Example of virtually imaged phased array (VIPA) technologies . 20
Annex D (informative) Example of GT etalon technologies . 22
Annex E (informative) Technology dependent characteristics of PCDCs . 23
Annex F (informative) Example of interface style . 24
Bibliography . 25

Figure A.1 – Chromatic dispersion in a standard single-mode optical fibre (SMF) . 16

IEC 61978-1:2024 © IEC 2024 – 3 –
Figure A.2 – Calculated contour for different dispersion at the wavelength of 1,55 µm
[CD(λ:1,55 µm)] for a step index core fibre . 17
Figure A.3 – Examples of refractive index profile used in DCF . 17
Figure B.1 – Illustration of the use of a chirped fibre Bragg grating for chromatic
dispersion compensation . 18
Figure B.2 – Expanded view over 10 nm of the insertion loss (attenuation) spectrum of
a multi-channel FBG . 19
Figure C.1 – Structure of virtually imaged phased array (VIPA) . 20
Figure C.2 – Detailed light path and mechanism of generating chromatic dispersion . 21
Figure D.1 – Gires-Tournois etalon . 22
Figure F.1 – Examples of interface style for fibre optic PCDCs . 24

Table 1 – Example of a typical fibre optic PDCS classification . 11
Table 2 – Application, channel numbers, passband and technologies of PDCSs . 12
Table E.1 – Summary of technology dependent characteristics of PCDCs . 23

– 4 – IEC 61978-1:2024 © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS – FIBRE OPTIC PASSIVE
CHROMATIC DISPERSION COMPENSATORS –

Part 1: 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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 61978-1 has been prepared by subcommittee 86B: Fibre optic interconnecting devices and
passive components, of IEC technical committee 86: Fibre optics. It is an International Standard.
This fourth edition cancels and replaces the third edition published in 2014. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) harmonization of terms and definitions with IEC TS 62627-09;
b) change of Clause 4 regarding requirements.

IEC 61978-1:2024 © IEC 2024 – 5 –
The text of this International Standard is based on the following documents:
Draft Report on voting
86B/4866/FDIS 86B/4901/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 61978 series, published under the general title Fibre optic
interconnecting devices and passive components – Fibre optic passive chromatic dispersion
compensators, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.

– 6 – IEC 61978-1:2024 © IEC 2024
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS – FIBRE OPTIC PASSIVE
CHROMATIC DISPERSION COMPENSATORS –

Part 1: Generic specification
1 Scope
This part of IEC 61978 applies to fibre optic passive chromatic dispersion compensators, all
exhibiting the following features:
– they are optically passive;
– they have an optical input and an optical output for transmitting optical power;
– the ports are optical fibres or optical fibre connectors;
– they are wavelength sensitive;
– they can be polarization sensitive.
This document establishes uniform requirements for the passive chromatic dispersion
compensator.
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 – Chapter 731: Optical fibre
communication
IEC 60617 (all parts), Graphical symbols for diagrams
IEC 61300 (all parts), Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures
IEC 61753 (all parts), Fibre optic interconnecting devices and passive components performance
standard
IEC TR 61930, Fibre optic graphical symbology
IEC 62005 (all parts), Reliability of fibre optic interconnecting devices and passive components
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

IEC 61978-1:2024 © IEC 2024 – 7 –
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 purposes of this document, the terms and definitions given in IEC 60050-731 and
IEC TS 62627-09 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1 Component terms
3.1.1
passive chromatic dispersion compensator
PCDC
two-port in-line passive device used to perform chromatic dispersion compensation
Note 1 to entry: PCDCs are commonly used to compensate the chromatic dispersion of an optical path by adding
the opposite sign chromatic dispersion.
Note 2 to entry: The typical optical paths comprise single-mode fibre, dispersion shifted fibre and/or non-zero
dispersion shifted fibre. PCDCs have either negative or positive chromatic dispersion values depending on the
chromatic dispersion sign of the optical path.
[SOURCE: IEC TS 62627-09:2016, 3.3.17]
3.1.2
dispersion compensating fibre
DCF
speciality fibre to compensate for the chromatic dispersion of an optical path
3.1.3
passive DCF based dispersion compensator
PCDC which constitutes DCF; realised by having chromatic dispersion characteristics of
opposite sign to that of the optical path which are controlled the refractive index profile of the
fibre
3.1.4
fibre Bragg grating
FBG
fibre type optical device which has periodically modulated refractive index profile in the core
along the fibre axis
3.1.5
passive FBG based dispersion compensator
PCDC which constitutes an FBG; PCDC is realised by a chirped FBG which has gradual change
in either modulation period or refractive index, or both, along the fibre axis
3.1.6
virtually imaged phased array
VIPA
optical device having a glass plate with a highly reflective mirror

– 8 – IEC 61978-1:2024 © IEC 2024
Note 1 to entry: A VIPA has the same functions as a grating.
3.1.7
passive VIPA based dispersion compensator
PCDC consisting of a VIPA, focusing lens and 3-dimensional mirror
Note 1 to entry: PCDC produces both positive and negative chromatic dispersion by the movement of the
3-dimensional mirror to compensate for the chromatic dispersion of an optical path.
3.1.8
etalon
optical cavity which consists of a pair of parallel reflective mirrors
3.1.9
Gires-Tournois etalon
GT etalon
etalon having a highly reflective mirror and a half mirror
Note 1 to entry: The GT etalon
...