SIST EN 61978-1:2014

SLOVENSKI STANDARD
SIST EN 61978-1:2014
01-oktober-2014
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Fibre optic interconnecting devices and passive components - Fibre optic passive
chromatic dispersion compensators - Part 1: Generic specification
Dispositifs d'interconnexion et composants passifs à fibres optiques - Compensateurs de
dispersion chromatique passifs à fibres optiques - Partie 1: Spécification générique
Ta slovenski standard je istoveten z: EN 61978-1:2014
ICS:
33.180.20 3RYH]RYDOQHQDSUDYH]D Fibre optic interconnecting
RSWLþQDYODNQD devices
SIST EN 61978-1:2014 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 61978-1:2014

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SIST EN 61978-1:2014


EUROPEAN STANDARD EN 61978-1

NORME EUROPÉENNE

EUROPÄISCHE NORM
August 2014
ICS 33.180.01 Supersedes EN 61978-1:2010
English Version
Fibre optic interconnecting devices and passive components -
Fibre optic passive chromatic dispersion compensators - Part 1:
Generic specification
(IEC 61978-1:2014)
Dispositifs d'interconnexion et composants passifs à fibres Lichtwellenleiter - Verbindungselemente und passive
optiques - Compensateurs de dispersion chromatique Bauteile - Passive Lichtwellenleiter - Kompensatoren mit
passifs à fibres optiques - Partie 1: Spécification générique chromatischer Dispersion - Teil 1: Fachgrundspezifikation
(CEI 61978-1:2014) (IEC 61978-1:2014)
This European Standard was approved by CENELEC on 2014-06-27. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels
© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN 61978-1:2014 E

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SIST EN 61978-1:2014
EN 61978-1:2014 - 2 -

Foreword
The text of document 86B/3639/CDV, future edition 3 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 61978-1:2014.
The following dates are fixed:
(dop) 2015-03-27
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2017-06-27
standards conflicting with the
document have to be withdrawn

This document supersedes EN 61978-1:2010.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.

Endorsement notice
The text of the International Standard IEC 61978-1:2014 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 60068 Series NOTE Harmonized as EN 60068 Series.
IEC 60869-1 NOTE Harmonized as EN 60869-1.
IEC 60874 Series NOTE Harmonized as EN 60874 Series.
IEC 60974 Series NOTE Harmonized as EN 60974 Series.
IEC 61073-1 NOTE Harmonized as EN 61073-1.
IEC 61300-1 NOTE Harmonized as EN 61300-1.
IEC 61300-2 Series NOTE Harmonized as EN 61300-2 Series.
IEC 61300-3 Series NOTE Harmonized as EN 61300-3 Series.
IEC 61753 Series NOTE Harmonized as EN 61753 Series.
IEC 61754 Series NOTE Harmonized as EN 61754 Series.
IEC 61754-4 NOTE Harmonized as EN 61754-4.
IEC 61754-13 NOTE Harmonized as EN 61754-13.
IEC 61754-15 NOTE Harmonized as EN 61754-15.
IEC 62005 Series NOTE Harmonized as EN 62005 Series.

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SIST EN 61978-1:2014
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Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.

NOTE 1 When 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 Letter symbols to be used in electrical - -
technology
IEC 60050-731 -  International Electrotechnical Vocabulary - -
(IEV) - Chapter 731: Optical fibre
communication
IEC 60617 series -  Standard data element types with - -
associated classification scheme for
electric components
IEC 60695-11-5 -  Fire hazard testing - Part 11-5: Test flames EN 60695-11-5 -
- Needle-flame test method - Apparatus,
confirmatory test arrangement and
guidance
IEC 60793-2-50 2012 Optical fibres - Part 2-50: Product EN 60793-2-50 2013
specifications - Sectional specification for
class B single-mode fibres
IEC 60825 series -  Radiation safety of laser products, EN 60825 series -
equipment classification, requirements and
user's guide
IEC 61300 series Fibre optic interconnecting devices and EN 61300 series -
passive components - Basic test and
measurement procedures
IEC 61300-3-38 -  Fibre optic interconnecting devices and EN 61300-3-38 -
passive components - Basic test and
measurement procedures - Part 3-
38:Examinations and measurements -
Group delay, chromatic dispersion and
phase ripple
IEC Guide 102 -  Electronic components - Specification - -
structures for quality assessment
(Qualification approval and capability
approval)
ISO 129-1 -  Technical drawings - Indication of - -
dimensions and tolerances - Part 1:
General principles
ISO 286-1 -  Geometrical product specifications (GPS) – EN ISO 286-1 -
ISO coding 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

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SIST EN 61978-1:2014
EN 61978-1:2014 - 4 -
Publication Year Title EN/HD Year
ISO 8601 -  Data elements and interchange formats - - -
Information interchange - Representation
of dates and times
IEC/TR 61930 -  Fibre optic graphical symbology - -

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SIST EN 61978-1:2014




IEC 61978-1

®


Edition 3.0 2014-05




INTERNATIONAL



STANDARD








colour

inside










Fibre optic interconnecting devices and passive components – Fibre optic

passive chromatic dispersion compensators –

Part 1: Generic specification


























INTERNATIONAL

ELECTROTECHNICAL

COMMISSION

PRICE CODE
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ICS 33.180.01 ISBN 978-2-8322-1583-8



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SIST EN 61978-1:2014
– 2 – IEC 61978-1:2014 © IEC 2014
CONTENTS

FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
3.1 Basic terms . 7
3.2 Component terms . 7
3.3 Performance parameter . 8
4 Requirements . 10
4.1 General . 10
4.2 Classification . 10
4.2.1 General . 10
4.2.2 Type . 10
4.2.3 Style . 11
4.2.4 Variant . 12
4.2.5 Normative reference extensions . 12
4.3 Documentation . 13
4.3.1 Symbols . 13
4.3.2 Specification system . 13
4.3.3 Drawings . 14
4.3.4 Tests and measurements . 15
4.3.5 Test data sheets . 15
4.3.6 Instructions for use . 15
4.4 Standardization system . 15
4.4.1 Performance standards . 15
4.4.2 Reliability standards . 16
4.4.3 Interlinking . 16
4.5 Design and construction. 18
4.5.1 Materials . 18
4.5.2 Workmanship . 18
4.6 Performance . 18
4.7 Identification and marking . 18
4.7.1 General . 18
4.7.2 Variant identification number . 18
4.7.3 Component marking . 19
4.7.4 Package marking . 19
4.8 Packaging . 19
4.9 Storage conditions . 20
4.10 Safety . 20
Annex A (informative) Example of dispersion compensating fibre (DCF) technologies . 21
Annex B (informative) Example of fibre Bragg grating (FBG) technologies . 23
Annex C (informative) Example of virtually imaged phased array (VIPA) technologies . 25
Annex D (informative) Example of GT etalon technologies . 27
Annex E (informative) Technology dependent characteristics of PCDCs . 28
Bibliography . 29

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SIST EN 61978-1:2014
IEC 61978-1:2014 © IEC 2014 – 3 –
Figure 1 – Standards currently under preparation . 17
Figure A.1 – Chromatic dispersion in a standard single-mode optical fibre (SMF) . 21
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 . 22
Figure A.3 – Examples of refractive index profile used in DCF . 22
Figure B.1 – Illustration of the use of a chirped fibre Bragg grating for chromatic
dispersion compensation . 23
Figure B.2 – Expanded view over 10 nm of the insertion loss spectrum of a multi-
channel FBG . 24
Figure C.1 – Structure of virtually imaged phased array (VIPA) . 25
Figure C.2 – Detailed light path and mechanism of generating chromatic dispersion . 26
Figure D.1 – Gires-Tournois etalon . 27

Table 1 – Types of passive chromatic dispersion compensators . 11
Table 2 – Three-level IEC specification structure . 13
Table 3 – Standards interlink matrix . 17
Table 4 – Quality assurance options . 18
Table E.1 – Summary of technology dependent characteristics of PCDCs . 28

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SIST EN 61978-1:2014
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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) 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 61978-1 has been prepared by subcommittee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
This third edition cancels and replaces the second edition, published in 2009, and constitutes
a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) introduction of new terms and definitions;
b) revision of classifications;
c) addition of Annex E.

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SIST EN 61978-1:2014
IEC 61978-1:2014 © IEC 2014 – 5 –
The text of this standard is based on the following documents:
CDV Report on voting
86B/3639/CDV 86B/3710/RVC

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 2.
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 publication will remain unchanged until
the stability 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 may be issued at a later date.

IMPORTANT – The “colour inside” logo on the cover page of this publication
indicates that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this publication using a
colour printer.

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SIST EN 61978-1:2014
– 6 – IEC 61978-1:2014 © IEC 2014
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 may be polarization sensitive.
This standard establishes uniform requirements for the passive chromatic dispersion
compensator.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. 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 60695-11-5, Fire hazard testing – Part 11-5: Test flames – Needle-flame test method –
Apparatus, confirmatory test arrangement and guidance
IEC 60793-2-50:2012, Optical fibres – Part 2-50: Product specifications – Sectional
specification for class B single-mode fibres
IEC 60825 (all parts), Safety of laser products
IEC 61300 (all parts), Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures
IEC 61300-3-38, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 3-38: Examinations and measurements – Group delay,
chromatic dispersion and phase ripple
IEC TR 61930, Fibre optic graphical symbology

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SIST EN 61978-1:2014
IEC 61978-1:2014 © IEC 2014 – 7 –
IEC Guide 102, Electronic components – Specification structures for quality assessment
(Qualification approval and capability approval)
ISO 129-1, Technical drawings – Indication of dimensions and tolerances – Part 1: General
principles
ISO 286-1, Geometrical product specifications (GPS) – ISO coding system for tolerances of
linear sizes – Part 1: Bases of tolerances and fits
ISO 1101, Geometrical Product Specifications (GPS) – Geometrical tolerancing – Tolerances
of form, orientation, location and run-out
ISO 8601, Data elements and interchange formats – Information interchange –
Representation of dates and times
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-731, as well
as the following definitions apply.
3.1 Basic terms
3.1.1
port
optical fibre or optical fibre connector attached to a passive component for the entry and/or
exit of optical power (input and/or output port)
3.2 Component terms
3.2.1
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.
3.2.2
dispersion compensating fibre
DCF
speciality fibre to compensate for the chromatic dispersion of an optical path
3.2.3
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
3.2.4
fibre Bragg grating
FBG
fibre type optical device which has modulated refractive index profile in the core

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SIST EN 61978-1:2014
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3.2.5
passive FBG based dispersion compensator
PCDC which constitutes a FBG; PCDC is realised by a chirped FBG which has gradually
changing refractive index along the fibre axis
3.2.6
virtually imaged phased array
VIPA
optical device having a glass plate with a highly reflective mirror
Note 1 to entry: A VIPA has the same functions as a grating.
3.2.7
passive VIPA based dispersion compensator
PCDC which 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.
3.2.8
etalon
optical cavity which consists of a pair of parallel reflective mirrors
3.2.9
Gires-Tournois etalon
GT etalon
etalon having a highly reflective mirror and a half mirror
Note 1 to entry: The GT etalon is sometimes called a GT interferometer.
3.2.10
passive GT etalon based dispersion compensator
PCDC which comprises a GT etalon
3.3 Performance parameter
3.3.1
chromatic dispersion compensation
process by which a specific amount of chromatic dispersion is removed in order to mitigate
the system impairment caused by unwanted dispersion
3.3.2
group delay
time by which a pulse is delayed by an optical device
Note 1 to entry: The group delay generally varies with the operating wavelength.
3.3.3
chromatic dispersion
derivative of group delay with respect to wavelength or frequency
Note 1 to entry: A typical unit is ps/nm or ps/GHz. The chromatic dispersion generally varies with the operating
wavelength.
Note 2 to entry: The units of ps/GHz are not commonly used; however, it is suitable for the evaluation of
transmission system influence.
3.3.4
dispersion slope
derivative of chromatic dispersion with respect to wavelength or frequency

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SIST EN 61978-1:2014
IEC 61978-1:2014 © IEC 2014 – 9 –
Note 1 to entry: A typical unit is ps/nm2 or ps/GHz2.The unit of ps/GHz2 is not commonly used; however, it is
suitable for the evaluation of transmission system influence.
Note 2 to entry: The dispersion slope generally varies with the operating wavelength
3.3.5
operating wavelength
nominal wavelength λ at which a passive device operates with the specified performance
Note 1 to entry: Operating wavelength includes the wavelength to be nominally transmitted, attenuated and
isolated.
3.3.6
operating wavelength range
specified range of wavelengths including all operating wavelengths
Note 1 to entry: Operating wavelength range shall include all passbands when two or more the passbands are exist.
3.3.7
figure of merit
FoM
ratio of the dispersion to the insertion loss of a PCDC at a particular operating wavelength
3.3.8
passband
wavelength range within which a passive optical component is required to operate with optical
attenuation less than or equal to a specified optical attenuation value
Note 1 to entry: There may be one or more passbands for a PCDC.
3.3.9
passband ripple
maximum peak-to-peak variation of insertion loss in the passband
Note 1 to entry: The passband ripple of a PCDC is defined as the maximum passband ripple for all passbands.
3.3.10
group delay ripple
GDR
maximum peak-to-peak variation of the group delay approximated by a desired function of
wavelength (or frequency), typically a linear fit, within a channel wavelength (or frequency)
range
3.3.11
phase ripple
maximum peak-to-peak variation in measured phase spectrum when compared to a quadratic
fit within a channel wavelength (or frequency) range
Note 1 to entry: Phase ripple (unit: radian) is calculated as the product of a peak-to-peak group delay ripple
(unit: s) and a period of group delay ripple (unit: Hz). Refer to IEC 61300-3-38.
3.3.12
insertion loss
reduction in optical power between an input and output port of a passive component
...