IEC 61978-1:2024
(Main)Fibre optic interconnecting devices and passive components - Fibre optic passive chromatic dispersion compensators - Part 1: Generic specification
Fibre optic interconnecting devices and passive components - Fibre optic passive chromatic dispersion compensators - Part 1: Generic specification
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.
Dispositifs d'interconnexion et composants passifs fibroniques - Compensateurs de dispersion chromatique passifs fibroniques - Partie 1 : Spécification générique
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.
General Information
Relations
Overview
IEC 61978-1:2024 is the fourth edition of the international generic specification for fibre optic passive chromatic dispersion compensators (PCDCs). It establishes uniform requirements for optically passive devices that have an optical input and output (ports are optical fibres or fibre connectors), are wavelength sensitive, and may be polarization sensitive. This 2024 edition cancels and replaces the 2014 edition and includes a technical revision that harmonizes terms with IEC TS 62627-09 and updates Clause 4 on requirements.
Key topics and technical requirements
This standard defines the general framework and expectations for PCDCs without prescribing detailed proprietary designs. Key technical topics covered include:
- Scope and classification
- Device types, technologies and wavelength bands applicable to PCDCs.
- Design and construction
- Materials, workmanship and interface styles for fibre-based ports.
- Performance requirements
- Parameters such as group delay, chromatic dispersion and phase ripple (referencing test methods like IEC 61300-3-38).
- Documentation and specification
- Required drawings, symbols, test data sheet formats and instructions for use.
- Testing, quality and reliability
- Test and measurement procedures, quality assurance options and reliability considerations.
- Identification, marking, packaging and storage
- Variant identification, component and package marking, packaging and recommended storage conditions.
- Safety
- Requirements aligned with laser product safety and fire hazard test standards where applicable.
Annexes provide informative examples of technologies commonly used for dispersion compensation, such as dispersion compensating fibre (DCF), fibre Bragg gratings (FBG), virtually imaged phased arrays (VIPA) and Gires–Tournois (GT) etalons, and discuss technology-dependent characteristics and interface styles.
Practical applications and who uses this standard
IEC 61978-1:2024 is intended for stakeholders involved with fibre optic passive chromatic dispersion compensation across telecom and datacom systems:
- Manufacturers of passive dispersion compensators and passive fibre components who need to ensure consistent product specifications.
- Systems integrators and network designers specifying dispersion compensation in DWDM, metro, long-haul and high‑speed links.
- Test laboratories and certification bodies conducting performance and reliability testing.
- Procurement, quality and regulatory teams seeking compliance baselines and uniform documentation.
- R&D teams evaluating technology choices (DCF, FBG, VIPA, GT etalon) against standardized requirements.
Related standards (selected)
- IEC 61300 series (fibre optic test and measurement procedures), especially IEC 61300-3-38
- IEC TS 62627-09 (vocabulary for passive optical devices)
- IEC 60793 series (optical fibre product specs)
- IEC 61753 (performance standards for fibre optic components)
Keywords: IEC 61978-1:2024, fibre optic passive chromatic dispersion compensators, chromatic dispersion compensation, passive optical components, fibre Bragg grating, dispersion compensating fibre, VIPA, Gires–Tournois etalon.
Standards Content (Sample)
IEC 61978-1 ®
Edition 4.0 2024-04
REDLINE VERSION
INTERNATIONAL
STANDARD
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inside
Fibre optic interconnecting devices and passive components – Fibre optic
passive chromatic dispersion compensators –
Part 1: Generic specification
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IEC 61978-1 ®
Edition 4.0 2024-04
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Fibre optic interconnecting devices and passive components – Fibre optic
passive chromatic dispersion compensators –
Part 1: Generic specification
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.01 ISBN 978-2-8322-8788-0
– 2 – IEC 61978-1:2024 RLV © 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 parameter terms . 8
4 Requirements . 11
4.1 Classification . 11
4.1.1 General . 13
4.1.2 Technology . 14
4.1.3 Types . 14
4.1.4 Wavelength band . 14
4.1.5 Application of PDCSs and their suitable technologies . 14
4.1.6 Interface style . 14
4.2 Documentation . 15
4.2.1 Symbols . 15
4.3.2 Specification system .
4.2.2 Drawings . 16
4.2.3 Tests and measurements . 16
4.2.4 Test data sheets report . 17
4.2.5 Instructions for use . 17
4.3 Standardisation system . 17
4.3.1 Interface standards . 17
4.3.2 Performance standards . 17
4.3.3 Reliability standards . 18
4.4.3 Interlinking .
4.4 Design and construction . 20
4.4.1 Materials . 20
4.4.2 Workmanship . 20
4.5 Quality . 20
4.6 Performance requirements . 20
4.7 Identification and marking . 21
4.7.1 General . 21
4.7.2 Variant identification number .
4.7.2 Component marking . 21
4.7.3 Package marking . 21
4.8 Packaging . 22
4.9 Storage conditions . 22
4.10 Safety . 22
Annex A (informative) Example of dispersion compensating fibre (DCF) technologies . 23
Annex B (informative) Example of fibre Bragg grating (FBG) technologies . 25
Annex C (informative) Example of virtually imaged phased array (VIPA) technologies . 27
Annex D (informative) Example of GT etalon technologies . 29
Annex E (informative) Technology dependent characteristics of PCDCs . 30
Annex F (informative) Example of interface style . 31
Bibliography . 32
Figure 1 – Standards currently under preparation .
Figure A.1 – Chromatic dispersion in a standard single-mode optical fibre (SMF) . 23
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 . 24
Figure A.3 – Examples of refractive index profile used in DCF . 24
Figure B.1 – Illustration of the use of a chirped fibre Bragg grating for chromatic
dispersion compensation . 25
Figure B.2 – Expanded view over 10 nm of the insertion loss (attenuation) spectrum of
a multi-channel FBG . 26
Figure C.1 – Structure of virtually imaged phased array (VIPA) . 27
Figure C.2 – Detailed light path and mechanism of generating chromatic dispersion . 28
Figure D.1 – Gires-Tournois etalon . 29
Figure F.1 – Examples of interface style for fibre optic PCDCs . 31
Table 1 – Example of a typical fibre optic PDCS classification . 13
Table 2 – Three-level IEC specification structure .
Table 2 – Application, channel numbers, passband and technologies of PDCSs . 14
Table 3 – Standards interlink matrix .
Table 4 – Quality assurance options .
Table E.1 – Summary of technology dependent characteristics of PCDCs . 30
– 4 – IEC 61978-1:2024 RLV © 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
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
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shall not be held responsible for identifying any or all such patent rights.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition IEC 61978-1:2014. A vertical bar appears in the margin
wherever a change has been made. Additions are in green text, deletions are in
strikethrough red text.
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.
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 RLV © 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 may 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 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 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
IEC Guide 102, Electronic components – Specification structures for quality assessment
(Qualification approval and capability approval)
ISO 129-1, Technical drawings product documentation (TPD) – Indication Presentation 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
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 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)
3.1 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]
– 8 – IEC 61978-1:2024 RLV © IEC 2024
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
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 is sometimes called a GT interferometer.
3.1.10
passive GT etalon based dispersion compensator
PCDC which comprises a GT etalon
3.2 Performance parameter terms
3.2.1
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
3.2.2
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.
3.2.3
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 unit of ps/GHz are not commonly used; however, it is suitable for the evaluation of transmission
system influence.
3.2.4
dispersion slope
derivative of chromatic dispersion with respect to wavelength or frequency
2 2 2
Note 1 to entry: A typical unit is ps/nm or ps/GHz .The unit of ps/GHz 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.
3.2.5
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.
3.2.6
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.
3.2.7
figure of merit
FoM
ratio of the dispersion to the insertion loss of a PCDC at a particular operating wavelength
3.2.8
passband
wavelength range within which a passive optical component device is required to operate with
optical attenuation less than or equal to a specified optical attenuation value
Note 1 to entry: There may can be one or more passbands for a PCDC.
3.2.9
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.
3.2.10
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
– 10 – IEC 61978-1:2024 RLV © IEC 2024
3.2.11
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.
3.2.12
insertion loss
reduction in optical power between an input and output port of a passive component device
Note 1 to entry: expressed in decibels (dB).
Note 2 to entry: insertion loss is expressed as follows:
P
a
a = −10log
P
P
a
a = −10log
P
where
P is the optical power launched into the input port;
P is the optical power received from the output port.
a
3.2.13
return loss
fraction of input power that is returned from a port of a passive component device expressed in
decibels
Note 1 to entry: The return loss is defined as follows:
P
r
RL = −10log
P
P
r
RL = −10log
P
where
P is the optical power launched into a port;
P is the optical power received back from the same port.
r
3.2.14
reflectance
ratio of the optical power returning back from a port to input power expressed in %
3.2.15
polarization dependent loss
PDL
maximum variation of insertion loss (attenuation) due to a variation of the state of polarization
(SOP) over all the SOPs
3.2.16
wavelength dependent loss
WDL
maximum variation of the insertion loss (attenuation) over operating wavelength range
3.2.17
polarization mode dispersion
PMD
average delay of the travelling time between the two principal states of polarization (PSP), when
an optical signal passes through a passive optical component device
4 Requirements
4.1 General
The requirements for PCDCs covered by this clause are intended to aid in classifying this device
in a relevant specification. Additional or more severe requirements may be imposed by the
relevant blank detail specification and by the detail specification.
4.1 Classification
4.2.1 General
PCDCs shall be classified as follows:
– type;
– style;
– variant;
– normative reference extensions.
4.2.2 Type
PCDCs can be categorized into different types, as follows:
– by operating technologies (DCF, FBG, VIPA, GT etalon and so on);
– by dispersion compensating performance (for example, wavelength dispersion
compensating, dispersion slope compensating);
– by operating wavelength range (for example, O-band, C-band, L-band);
– by categories of transmission fibre which PCDCs are applied (for example,
IEC 60793-2-50:2012, B1, B2, B4).
The application of PCDCs and the suitable operating mechanisms are summarized in Table 1.
Table 1 – Types of passive chromatic dispersion compensators
Applications Channel number Passbands Technologies
TDM (Time division Single channel Narrow Dispersion compensating
multiplexing) fibre (DCF)
Fibre Bragg grating (FBG)
GT etalon
WDM (Wavelength Single channel Narrow FBG
division multiplexing)
a
Narrow FBG
Multi-channel
GT etalon
Virtually imaged phased
array (VIPA)
Wide DCF
a
Multi-channel PCDCs can be used for a single channel use.
– 12 – IEC 61978-1:2024 RLV © IEC 2024
4.2.3 Style
4.2.3.1 General
PCDC may be classified into styles based on the fibre type(s), the connector type(s), cable
type(s), housing shape, temperature control and the configuration. Style is not intended to
define material or design. The configurations of PCDC ports are classified as follows.
4.2.3.2 Configuration A
A device containing integral fibre optic pigtails, without connectors.
PCDC
Pigtail
IEC 1687/2000
4.2.3.3 Configuration B
A device containing integral fibre optic pigtails, with a connector on each pigtail.
Connector
PCDC
Pigtail
IEC 1688/2000
4.2.3.4 Configuration C
A device containing fibre optic connectors as an integral part of the device housing.
Connecteur
PCDC
IEC 1689/2000
4.2.3.5 Configuration D
A device containing some combination of the interfacing features of the preceding
configurations.
4.2.4 Variant
The PCDC variant identifies those common features which encompass structurally similar
components.
Examples of features which define a variant include, but are not limited to, the following:
– fibre type;
– connector type.
4.2.5 Normative reference extensions
Normative reference extensions are used to identify integrated independent standards,
specifications or other reference documents into blank detail specifications.
Unless a specified exception is noted, additional requirements imposed by an extension are
mandatory. Usage is primarily intended to merge associated components to form hybrid devices,
or integrated functional application requirements that are dependent on technical expertise
other than fibre optics.
Published reference documents produced by ITU consistent with the scope statements of the
relevant IEC specification series may be used as an extension. Published documents produced
by other regional standardization bodies such as TIA, ETSI, JIS, etc., may be referenced in a
bibliography attached to the generic specification.
Some optical fibre splice configurations require special qualification provisions that shall not be
imposed universally. This accommodates individual component design configurations,
specialized field tooling, or specific application processes. In this case, requirements are
necessary to assure repeatable performance or adequate safety, and provide additional
guidance for complete product specification. These extensions are mandatory whenever used
to prepare, assemble or install an optical fibre splice either for field application usage or
preparation of qualification test specimens. The relevant specification shall clarify all stipulations.
However, design- and style-dependent extensions shall not be imposed universally.
In the event of conflicting requirements, precedence shall be given, in descending order, as
follows: generic over mandatory extension, over blank detail, over detail, over application
specific extension.
Examples of requirements for normative extensions are as follows:
a) some commercial or residential building applications may require direct reference to specific
safety codes and regulations or incorporate other specific material flammability or toxicity
requirements for specialized locations;
b) specialized field tooling may require an extension to implement specific ocular safety,
electrical shock or burn hazard avoidance requirements, or require isolation procedures to
prevent potential ignition of combustible gases.
4.1.1 General
Fibre optic passive chromatic dispersion compensators (PCDCs) are classified either wholly or
partially within the following categories:
– technology;
– type;
– wavelength band;
– categories of transmission fibre;
– interface style.
An example of a typical fibre optic PDCS classification is given in Table 1.
Table 1 – Example of a typical fibre optic PDCS classification
Items Classification
Technology DCF
Type Wavelength dispersion compensating
Wavelength band C-band
Category of transmission fibre B-652
Interface style Configuration D
Fibre category: IEC 60793-2-50, B-652
IEC 61754-4 (SC connector)
– 14 – IEC 61978-1:2024 RLV © IEC 2024
4.1.2 Technology
PCDCs typically use the following technologies:
– dispersion compensating fibre (DCF);
– fibre Bragg grating (FBG);
– Virtual Image Phased Array (VIPA);
– GT etalon.
Each technology of PCDCs is described in Annex A to Annex D.
4.1.3 Types
– Wavelength dispersion compensation;
– Wavelength dispersion slope compensation.
4.1.4 Wavelength band
– O-band;
– S-band;
– C-band;
– L-band;
– C-band and L-band;
– other wavelength band or combination of wavelength bands above.
4.1.5 Application of PDCSs and their suitable technologies
The application of PCDCs and the suitable technologies are summarized in Table 2.
Technology dependent characteristics of PCDCs are summarized in Annex E.
Table 2 – Application, channel numbers, passband and technologies of PDCSs
Applications Channel number Passbands Technologies
TDM (time division multiplexing) Single channel Narrow Dispersion compensating fibre
(DCF)
Fibre Bragg grating (FBG)
GT etalon
WDM (wavelength division multiplexing) Single channel Narrow FBG
a)
Narrow FBG
Multi-channel
GT etalon
Virtually imaged phased array
(VIPA)
Wide DCF
a)
Multi-channel PCDCs can be used for a single channel use.
4.1.6 Interface style
PCDC style shall be defined based on the following elements:
– the input and output port configuration;
– the connector set type(s), if any.
NOTE Examples of interface style are provided in Annex F.
4.2 Documentation
4.2.1 Symbols
Graphical and letter symbols shall, whenever possible, be taken from IEC 60027 series,
IEC 60617 and IEC TR 61930.
4.3.2 Specification system
4.3.2.1 General
This specification is part of a three-level IEC specification system. Subsidiary specifications
shall consist of blank detail specifications and detail specifications. This system is shown in
Table 2. There are no sectional specifications for passive dispersion compensators.
Table 2 – Three-level IEC specification structure
Specification level Examples of information to be included Applicable to
Basic Inspection rules Two or more component
families or subfamilies
Optical measuring methods
Environmental test methods
Sampling plans
Identification rule
Marking standards
Dimensional standards
Terminology standards
Symbol standards
Preferred number series
SI units
Generic Specific terminology Component family
Specific symbols
Specific units
Preferred values
Marking
Selection of tests
Blank detail Quality conformance test schedule Groups of types having a
common test schedule
Inspection requirements
Information common to a number of types
Detail Individual values Individual type
Specific information
Completed quality conformance test schedules
4.3.2.2 Blank detail specifications
The blank detail specification lists all of the parameters and features applicable to a PCDC,
including the type, operating characteristics, housing configurations, test methods, and
performance requirements. The blank detail specification is applicable to any PCDC design and
quality assessment requirement. The blank detail specification contains the preferred format for
stating the required information in the detail specification.
Blank detail specifications are not, by themselves, a specification level. They are associated
with the generic specification.
– 16 – IEC 61978-1:2024 RLV © IEC 2024
Each blank detail specification shall be limited to one environmental category.
Each blank detail specification shall contain
– the minimum mandatory test schedules and performance requirements,
– one or more assessment levels,
– the preferred format for stating the required information in the detail specification,
– in case of hybrid components, including connectors, addition of appropriate entry fields to
show the reference normative document, document title and issue date.
4.3.2.3 Detail specifications
A specific PCDC is described by a corresponding detail specification, which is prepared by
filling in the blanks of the blank detail specification. Within the constraints imposed by this
generic specification, the blank detail specification may be filled in by any national committee
of the IEC, thereby defining a particular PCDC as an IEC standard.
Detail specifications shall specify the following, as applicable:
– type (see 4.2.2);
– style (see 4.2.3);
– variant(s) (see 4.2.4);
– part identification number for each variant (see 4.7.1);
– drawings, dimensions required (see 4.3.3);
– performance requirements (see 4.6).
4.2.2 Drawings
4.2.2.1 General
The drawings and dimensions given in detail the relevant specifications shall not restrict detail
construction nor shall they be used as manufacturing drawings.
4.2.2.2 Projection system
Either first angle or third angle projection shall be used for the drawings in documents covered
by this document. All drawings within a document shall use the same projection system and the
drawings shall state which system is used.
4.2.2.3 Dimensional system
All dimensions shall be given in accordance with ISO 129-1 for general information of
dimensions and tolerances, ISO 286-1 for tolerances of form, orientation location and run out
for information, and ISO 1101 for information interchange. The metric system shall be used in
all specifications. Dimensions shall not contain more than five significant digits. When units are
converted, a note shall be added in each relevant specification and the conversion between
systems of units shall use a factor of 25,4 mm to 1 inch.
4.2.3 Tests and measurements
4.2.3.1 Tests and measurements procedures
The tests and measurements procedures for optical, mechanical, climatic, and environmental
characteristics of passive dispersion compensators fibre optic PCDCs to be used shall be
defined and selected preferentially from IEC 61300 series. The size measurement method to
be used shall be specified in the detail specification relevant IEC 61753 series performance
standard or IEC 62005 series reliability standard, for dimensions which are specified within a
total tolerance zone of 0,01 mm or less.
4.2.3.2 Reference components
Reference components for measurement purposes, if required, shall be specified in the relevant
specification IEC 61300 basic test and procedure standard.
4.3.4.3 Gauges
Gauges, if required, shall be specified in the relevant specification.
4.2.4 Test data sheets report
Test data sheets shall be prepared for each test conducted as required by a relevant
specification. The data sheets shall be included in the qualification report and in the periodic
inspection report.
Data sheets shall contain the following information as a minimum:
– title of test and date;
– specimen description including the type of fibre, connector or other coupling device. The
description shall also include the variant identification number (see 4.7.2);
– test equipment used and date of latest calibration;
– all applicable test details;
– all measurement values and observations;
– sufficiently detailed documentation to provide traceable information for failure analysis.
The test reports shall be prepared for each test conducted as required by a relevant IEC 61753
series performance standard or IEC 62005 series reliability standard. The reports shall be
included in the qualification test report and in the periodic inspection report.
Test reports shall contain the following information as a minimum:
– title and date of test;
– test equipment used;
– all applicable test details;
– all measurement values and observations.
4.2.5 Instructions for use
Instructions for use, when required, shall be given by the manufacturer and shall include.
– assembly and connection instructions;
– cleaning method;
– safety aspects;
– additional information as necessary.
4.3 Standardisation system
4.3.1 Interface standards
Refer to the proper optical connector interface of the IEC 61754 series when an optical
connector is used.
4.3.2 Performance standards
Performance standards (IEC 61753 series) contain a series of tests and measurements (which
may or may not can be grouped into a specified schedule depending on the requirements of
that standards) with clearly defined conditions, severities, and pass/fail criteria. The tests are
– 18 – IEC 61978-1:2024 RLV © IEC 2024
intended to be run on a one-off basis to prove the ability of any product to satisfy the
performance standards requirement. Each performance standard has a different set of tests,
and/or severities, ( and/or groupings), representing the requirements of a market sector, user
group or system location.
A product that has been shown to meet all the requirements of a performance standard can be
declared as complying with a performance standard but should then be controlled by a quality
assurance/ and quality conformance programme.
It is possible to define a key point of the test and measurements standards when these are
applied (particularly with regard to insertion loss and return loss) in conjunction with the
interface standards of inter product compatibility. This ensures conformance of each individual
product to this standard,
4.3.3 Reliability standards
Reliability standards are intended to ensure that a component can meet performance
specifications under stated conditions for a stated time period.
For each type of component, the following shall be identified (and appear in the standard):
• failure modes (ways in which a component can fail);
• failure mechanisms (causes of failure, which may be common to several components);
• failure effects (observable, general, mechanical or optical effects of failure).
These are all related to environmental and material aspects.
Initially, just after component manufacture, there is an “infant mortality phase” during which
many components would fail if they were deployed in the field. To avoid early field failure, all
components may be subjected to a screening process in the factory involving environmental
stresses that may be mechanical, thermal or humidity-related. This is to induce known failure
mechanisms in a controlled environmental situation to occur earlier than would normally be
seen in the unscreened population. For those components that survive (and are then sold),
there is a reduced failure rate, since these mechanisms have been eliminated.
Screening is an optional part of the manufacturing process, rather than a test method. It will not
affect the “useful life” of a component defined as the period during which it performs according
to specifications. Eventually other failure mechanisms appear, and the failure rate increases
beyond the defined threshold. At this point the useful life ends and the “wear-out region” begins,
and the component shall be replaced.
At the beginning of useful life, performance testing on a sampled population of components ma
...
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
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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
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.
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
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 is sometimes called a GT interferometer.
3.1.10
passive GT etalon based dispersion compensator
PCDC which comprises a GT etalon
3.2 Performance terms
3.2.1
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
3.2.2
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.
3.2.3
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 unit of ps/GHz are not commonly used; however, it is suitable for the evaluation of transmission
system influence.
3.2.4
dispersion slope
derivative of chromatic dispersion with respect to wavelength or frequency
2 2 2
Note 1 to entry: A typical unit is ps/nm or ps/GHz .The unit of ps/GHz 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.
3.2.5
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.
3.2.6
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.
3.2.7
figure of merit
FoM
ratio of the dispersion to the insertion loss of a PCDC at a particular operating wavelength
3.2.8
passband
wavelength range within which a passive optical device is required to operate with optical
attenuation less than or equal to a specified optical attenuation value
Note 1 to entry: There can be one or more passbands for a PCDC.
3.2.9
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.
3.2.10
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
3.2.11
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.
3.2.12
insertion loss
reduction in optical power between an input and output port of a passive device
Note 1 to entry: expressed in decibels (dB).
Note 2 to entry: insertion loss is expressed as follows:
P
a
a=−10log
P
where
P is the optical power launched into the input port;
P is the optical power received from the output port.
a
3.2.13
return loss
fraction of input power that is returned from a port of a passive device expressed in decibels
– 10 – IEC 61978-1:2024 © IEC 2024
Note 1 to entry: The return loss is defined as follows:
P
r
RL=−10log
P
where
P is the optical power launched into a port;
P is the optical power received back from the same port.
r
3.2.14
reflectance
ratio of the optical power returning back from a port to input power expressed in %
3.2.15
polarization dependent loss
PDL
maximum variation of insertion loss (attenuation) due to a variation of the state of polarization
(SOP) over all the SOPs
3.2.16
wavelength dependent loss
WDL
maximum variation of the insertion loss (attenuation) over operating wavelength range
3.2.17
polarization mode dispersion
PMD
average delay of the travelling time between the two principal states of polarization (PSP), when
an optical signal passes through a passive optical device
4 Requirements
4.1 Classification
4.1.1 General
Fibre optic passive chromatic dispersion compensators (PCDCs) are classified either wholly or
partially within the following categories:
– technology;
– type;
– wavelength band;
– categories of transmission fibre;
– interface style.
An example of a typical fibre optic PDCS classification is given in Table 1.
Table 1 – Example of a typical fibre optic PDCS classification
Items Classification
Technology DCF
Type Wavelength dispersion compensating
Wavelength band C-band
Category of transmission fibre B-652
Interface style Configuration D
Fibre category: IEC 60793-2-50, B-652
IEC 61754-4 (SC connector)
4.1.2 Technology
PCDCs typically use the following technologies:
– dispersion compensating fibre (DCF);
– fibre Bragg grating (FBG);
– Virtual Image Phased Array (VIPA);
– GT etalon.
Each technology of PCDCs is described in Annex A to Annex D.
4.1.3 Types
– Wavelength dispersion compensation;
– Wavelength dispersion slope compensation.
4.1.4 Wavelength band
– O-band;
– S-band;
– C-band;
– L-band;
– C-band and L-band;
– other wavelength band or combination of wavelength bands above.
4.1.5 Application of PDCSs and their suitable technologies
The application of PCDCs and the suitable technologies are summarized in Table 2.
Technology dependent characteristics of PCDCs are summarized in Annex E.
– 12 – IEC 61978-1:2024 © IEC 2024
Table 2 – Application, channel numbers, passband and technologies of PDCSs
Applications Channel number Passbands Technologies
TDM (time division multiplexing) Single channel Narrow Dispersion compensating fibre
(DCF)
Fibre Bragg grating (FBG)
GT etalon
WDM (wavelength division multiplexing) Single channel Narrow FBG
a)
Narrow FBG
Multi-channel
GT etalon
Virtually imaged phased array
(VIPA)
Wide DCF
a)
Multi-channel PCDCs can be used for a single channel use.
4.1.6 Interface style
PCDC style shall be defined based on the following elements:
– the input and output port configuration;
– the connector set type(s), if any.
NOTE Examples of interface style are provided in Annex F.
4.2 Documentation
4.2.1 Symbols
Graphical and letter symbols shall, whenever possible, be taken from IEC 60027 series,
IEC 60617 and IEC TR 61930.
4.2.2 Drawings
4.2.2.1 General
The drawings and dimensions given in the relevant specifications shall not restrict detail
construction nor be used as manufacturing drawings.
4.2.2.2 Projection system
Either first angle or third angle projection shall be used for the drawings in documents covered
by this document. All drawings within a document shall use the same projection system and the
drawings shall state which system is used.
4.2.2.3 Dimensional system
All dimensions shall be given in accordance with ISO 129-1 for general information of
dimensions and tolerances, ISO 286-1 for tolerances of form, orientation location and run out
for information, and ISO 1101 for information interchange. The metric system shall be used in
all specifications. Dimensions shall not contain more than five significant digits. When units are
converted, a note shall be added in each relevant specification.
4.2.3 Tests and measurements
4.2.3.1 Tests and measurements procedures
The tests and measurements procedures for optical, mechanical, climatic, and environmental
characteristics of fibre optic PCDCs to be used shall be defined and selected preferentially from
IEC 61300 series. The size measurement method to be used shall be specified in the relevant
IEC 61753 series performance standard or IEC 62005 series reliability standard, for
dimensions which are specified within a total tolerance zone of 0,01 mm or less.
4.2.3.2 Reference components
Reference components for measurement purposes, if required, shall be specified in the relevant
IEC 61300 basic test and procedure standard.
4.2.4 Test report
The test reports shall be prepared for each test conducted as required by a relevant IEC 61753
series performance standard or IEC 62005 series reliability standard. The reports shall be
included in the qualification test report and in the periodic inspection report.
Test reports shall contain the following information as a minimum:
– title and date of test;
– test equipment used;
– all applicable test details;
– all measurement values and observations.
4.2.5 Instructions for use
Instructions for use, when required, shall be given by the manufacturer.
4.3 Standardisation system
4.3.1 Interface standards
Refer to the proper optical connector interface of the IEC 61754 series when an optical
connector is used.
4.3.2 Performance standards
Performance standards (IEC 61753 series) contain a series of tests and measurements (which
can be grouped into a specified schedule depending on the requirements of that standards)
with clearly defined conditions, severities, and pass/fail criteria. The tests are intended to be
run on a one-off basis to prove the ability of any product to satisfy the performance standards
requirement. Each performance standard has a different set of tests severities, and groupings,
representing the requirements of a market sector, user group or system location.
A product that has been shown to meet all the requirements of a performance standard can be
declared as complying with a performance standard but should then be controlled by a quality
assurance and quality conformance programme.
4.3.3 Reliability standards
Reliability standards are intended to ensure that a component can meet performance
specifications under stated conditions for a stated time period.
– 14 – IEC 61978-1:2024 © IEC 2024
4.4 Design and construction
4.4.1 Materials
4.4.1.1 General
All housing materials used in the construction shall be manufactured with materials which meet
the requirements of the relevant IEC 61753 performance standard or IEC 62005 reliability
standard.
4.4.1.2 Non-flammable materials
When non-flammable materials are required, the requirements shall be specified, and reference
shall be made to IEC 60695-11-5. If an alternate standard is used for non-flammable materials,
it shall be declared.
4.4.2 Workmanship
Components and associated hardware shall be manufactured to a uniform quality and shall be
free of sharp edges, burrs, or other defects that would affect life, service ability or appearance.
Particular attention shall be given to neatness and thoroughness of marking, plating, soldering,
bonding, etc.
4.5 Quality
Fibre optic PCDCs shall be controlled by the quality assessment procedures and declared.
4.6 Performance requirements
Fibre optic PCDCs shall meet the performance requirements specified in the relevant IEC 61753
performance standard or IEC 62005 reliability standard.
4.7 Identification and marking
4.7.1 General
Components, associated hardware and shipping packages shall be permanently and legibly
identified and marked when required by the relevant IEC 61753 performance standard or
IEC 62005 reliability standard.
4.7.2 Component marking
Component marking, if required, should be specified in the relevant IEC 61753 performance
standard or IEC 62005 reliability standard. The preferred order of marking is:
a) port identification;
b) manufacturer's part number (including serial number, if applicable);
c) manufacturer's identification mark or logo.
If space does not allow for all the required marking on the component, each unit shall be
individually packaged with a data sheet containing all of the required information which is not
marked.
4.7.3 Package marking
Several devices may be packaged together for shipment.
Package marking, if required, shall be specified in the relevant IEC 61753 performance
standard or IEC 62005 reliability standard. The preferred order of marking is:
a) manufacturer's identification mark or logo;
b) manufacturer's part number.
When applicable, individual unit packages (within the sealed package) should be marked with
the reference number of the certified record of released lots, the manufacturer's factory identity
code and the component identification.
4.8 Packaging
Packaging shall be securely without any damage to passive optical components during
transportation and storage.
Packages shall include instructions for use when required by the relevant IEC 61753
performance standard or IEC 62005 reliability standard (see 4.2.5).
4.9 Storage conditions
Where short-term degradable materials, such as adhesives, are supplied with the package, the
manufacturer shall mark these with the expiry date according to ISO 8601-1 together with any
requirements or precautions concerning safety hazards or environmental conditions for storage.
4.10 Safety
Fibre optic PCDCs, when used on an optical fibre transmission system and/or equipment, can
emit potentially hazardous radiation from an uncapped or unterminated output port or fibre end.
The fibre optic PCDC manufacturers shall provide sufficient information to alert system
designers and users about the potential hazard and shall indicate the required precautions and
working practices.
In addition, each relevant IEC 61753 performance standard or IEC 62005 reliability standard
shall include the following:
WARNING – Care should be taken when handling small diameter fibre to prevent
puncturing the skin, especially in the eye area. Direct viewing of the end of an optical
fibre or an optical fibre connector when it is propagating energy is not recommended,
unless prior assurance has been obtained as to the safety energy output level.
– 16 – IEC 61978-1:2024 © IEC 2024
Annex A
(informative)
Example of dispersion compensating fibre (DCF) technologies
Chromatic dispersion in optical fibre is expressed as the sum of material dispersion caused by
wavelength dependence of the refractive index of the glass materials and waveguide dispersion
caused by index profile of optical fibre (Figure A.1). Silica glass optical fibre material dispersion
does not vary greatly. Waveguide dispersion can be controlled by changing the index profile of
the optical fibre. DCFs are designed to control waveguide dispersion to achieve the desired
dispersion characteristics.
Figure A.1 – Chromatic dispersion in a standard single-mode optical fibre (SMF)
Figure A.2 shows the contour for different dispersions at a wavelength of 1,55 µm as a function
of the refractive index contrast, ∆, from a pure silica cladding index value level and core
diameter in a step-index profile with the germanium-doped silica core. From this figure, a DCF
with a large negative chromatic dispersion can be obtained by increasing ∆ and decreasing the
diameter of the core.
NOTE ∆ is the relative index contrast. Refer IEC IEV 731-02-20.
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
Figure A.3 shows two examples of refractive index profiles of DCFs. The refractive index
contrast between the core and the cladding is larger and the core diameter is smaller than those
of standard single-mode fibres. These design differences result in larger waveguide dispersion.
As for the double-cladding type DCF, much larger waveguide dispersion can be obtained than
in the case of the matched cladding type DCF.
Double cladding type DCF can give negative dispersion slope in C-band and/or L-band.
Because of this, the positive dispersion slope of SMFs (IEC 60793-2-50, B1 fibres) can be
compensated by using this type of DCF. Dispersion slope compensation is important to achieve
a uniform dispersion value over the wavelength range of a WDM transmission system.
a) Matched cladding type b) Double cladding type
Figure A.3 – Examples of refractive index profile used in DCF
– 18 – IEC 61978-1:2024 © IEC 2024
Annex B
(informative)
Example of fibre Bragg grating (FBG) technologies
Fibre Bragg grating (FBG) is a fibre type optical device that has a modulated refractive index
profile in the core along the longitudinal axis. A FBG functions as a reflective filter where
reflection wavelength is defined in Formula (B.1). Generally, refractive index modulation is
generated by using UV radiation induced refractive index change.
λ= 2××Λ n
(B.1)
B eff
where
λ is the reflection wavelength (Bragg wavelength);
B
Λ is the refractive index modulation period;
n is the effective refractive index.
eff
The basic principle of dispersion compensation using a chirped FBG is shown in Figure B.1. In
chirped FBG, either the grating period or effective refractive index, or both, are gradually
changed, and reflection wavelength changes along the fibre axis. After travelling through the
transport fibre, the signal experiences a positive chromatic dispersion so that its shorter-
wavelength part arrives before its longer-wavelength part. The chirped FBG provides more
group delay for the shorter-wavelength part of the signal thus compensating for the effect of the
chromatic dispersion. The slope of the group delay spectrum corresponds to the dispersion the
FBG provides. To conveniently access the output signal, an optical circulator is used.
Figure B.1 – Illustration of the use of a chirped fibre Bragg grating
for chromatic dispersion compensation
The FBG can be made multi-channel, allowing for a simultaneous compensation of the
chromatic dispersion accumulated in all channels of a WDM system. The multi-channel
character of the FBG is typically obtained through a sampling approach, i.e. a spatial modulation
of its physical properties. As an example, Figure B.2 shows an expanded view over 10 nm of
the spectral characteristics of a multi-channels FBG tailored for compensating the chromatic
dispersion accumulated over 100 km of single-mode fibre, specified in IEC 60793-2-50,
category B1.
a) Insertion loss (attenuation) including the optical circulator
b) Group delay spectrum
Figure B.2 – Expanded view over 10 nm of the insertion loss (attenuation)
spectrum of a multi-channel FBG
– 20 – IEC 61978-1:2024 © IEC 2024
Annex C
(informative)
Example of virtually imaged phased array (VIPA) technologies
Figure C.1 shows the structure of a virtually imaged phased array (VIPA). The input light from
a single-mode fibre is line-focused into a glass plate. The glass plate is coated on both surfaces
and collimated light is emitted from the reverse side of the glass plate after multiple reflections
between the coated surfaces. The light from the glass plate is then focused onto a curved mirror.
The reflected light travels back to the glass plate and is finally coupled back into the fibre.
Figure C.1 – Structure of virtually imaged phased array (VIPA)
Figure C.2 shows the detailed light path. Each time that the light is reflected at the right-angle
surface of the glass plate, a small percentage of the power passes through the partially
reflecting coating. This creates multiple beams that diverge from the corresponding beam waist
in the virtual image. The interference of these diverging beams generates collimated light. This
collimated light travels at an angle from the optical axis which varies with the wavelength.
Chromatic dispersion, i.e. the wavelength dependence of distance travelled, is determined by
the wavelength dependence of the pointing angle of collimated light from the glass plate and
the surface profile of the reflection mirror. The convex portion of the mirror produces negative
chromatic dispersion, and the concave portion of the mirror produces positive chromatic
dispersion. Figure C.1 shows that the collimated light (grey line area on the surface of the 3-D
mirror) reflects along the concave mirror surface
...
Frequently Asked Questions
IEC 61978-1:2024 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Fibre optic interconnecting devices and passive components - Fibre optic passive chromatic dispersion compensators - Part 1: Generic specification". This standard covers: 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.
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.
IEC 61978-1:2024 is classified under the following ICS (International Classification for Standards) categories: 33.180.01 - Fibre optic systems in general. The ICS classification helps identify the subject area and facilitates finding related standards.
IEC 61978-1:2024 has the following relationships with other standards: It is inter standard links to IEC 61978-1:2014. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase IEC 61978-1:2024 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of IEC standards.
IEC 61978-1:2024は、ファイバ光学受動色分散補償器に関する包括的な仕様を提供するものであり、この標準はその光学的特性により、光学入力と出力を持つ受動デバイスとして分類されます。この文書は、受動色分散補償器のための標準的な要件を確立しており、光ファイバーまたは光ファイバーコネクタを用いたポートを備え、波長や偏光に敏感な特性を持つデバイスに適用されます。 このIEC 61978-1:2024の特に優れた点は、その技術的改訂にあります。最新の版では、IEC TS 62627-09との用語と定義の調和が図られており、これにより業界全体での一貫性が向上しています。また、要求事項に関する第4条の変更が行われ、より明確で具体的な基準が定められています。このような明確な基準は、設計者や製造者が受動色分散補償器の特性を正確に理解し、適切に運用できることを保障します。 この標準は受動色分散補償器の設計や製造において極めて重要であり、通信インフラの信頼性を維持し、光通信システムの性能を最適化するための基盤を提供します。特に、波長敏感性や偏光敏感性を持つデバイスにおいて、信号の劣化を抑え、通信品質を向上させるための重要な指針となります。 IEC 61978-1:2024は、この分野における技術的進歩を反映しており、ファイバ光学技術の発展に寄与することが期待されます。これにより、様々な適用分野における効率的かつ高性能な通信を実現するための基盤が再確認されています。
La norme IEC 61978-1:2024 concerne les dispositifs d'interconnexion à fibre optique et les composants passifs, en se concentrant spécifiquement sur les compensateurs passifs de dispersion chromatique en fibre optique. Son champ d'application est précis et bien défini, s'appliquant aux compensateurs passifs qui affichent des caractéristiques clés, notamment leur nature optiquement passive, la capacité de transmettre la puissance optique via des ports constitués de fibres optiques ou de connecteurs de fibres optiques, ainsi que leur sensibilité aux longueurs d'onde et potentiellement à la polarisation. Les points forts de cette norme résident dans l'établissement de critères uniformes pour les compensateurs passifs de dispersion chromatique, contribuant ainsi à garantir la qualité et l'interopérabilité des appareils à fibre optique. Cette quatrième édition, qui annule et remplace la troisième édition de 2014, intègre des révisions techniques significatives qui renforcent sa pertinence. En particulier, l'harmonisation des termes et définitions avec IEC TS 62627-09, et les modifications apportées au Clause 4 concernant les exigences, reflètent un engagement à maintenir des standards d'excellence et à répondre aux évolutions technologiques du secteur. La norme IEC 61978-1:2024 constitue donc un document essentiel pour les professionnels travaillant avec des dispositifs à fibre optique, en assurant la conformité et la fiabilité des compensateurs de dispersion chromatique passifs utilisés dans des applications variées. Cette norme est particulièrement pertinente dans un contexte où la demande pour des solutions de communication optique de haute qualité est en constante augmentation, renforçant ainsi l'importance de la standardisation dans ce domaine.
IEC 61978-1:2024は、光ファイバーパッシブ色分散補償器に関する標準であり、その範囲は光学的にパッシブであり、光入力および光出力を持つデバイスに適用されます。この標準文書は、光ファイバーや光ファイバーコネクタによるポートを利用し、波長に敏感であり、さらには偏光感受性を持つデバイスに特化しています。 この標準の強みは、光ファイバーパッシブ色分散補償器に必要とされる統一基準を確立している点です。特に、2014年に発行された第三版を廃止し、技術的な改訂が行われた第四版は、先進的な技術要件を包括しています。重要な技術的変更点として、IEC TS 62627-09との用語および定義の調和が挙げられます。これにより、業界全体での相互運用性が向上し、各種デバイスやシステムの整合性が高まります。 また、Clause 4の要件の変更は、光ファイバーパッシブ色分散補償器に対する期待を明確にし、業界の最新のニーズに応じた基準を提供します。このような標準が整備されることで、製品開発や技術革新において、さらなる信頼性と効果的な運用が期待できます。 IEC 61978-1:2024は、光ファイバー技術における重要な基準であり、関連する全ての関係者にとって、不可欠なリファレンスとなることでしょう。
IEC 61978-1:2024 표준은 광섬유 소극적 색차 보상 장치에 대한 포괄적인 사양을 제시하며, 이는 광학적으로 소극적이며, 광학 입력과 출력이 있어 광학 전력을 전송할 수 있는 모두에게 적용됩니다. 이 표준의 범위는 다양한 포트가 광섬유 또는 광섬유 커넥터로 구성되며, 파장 감도와 편극 감도를 갖는 장치까지 포함됩니다. IEC 61978-1:2024의 강점은 통일된 요구 사항을 정립함으로써 여러 제조업체가 일관된 품질을 보장하며, 장치 간의 호환성을 크게 향상시키는 데 있습니다. 또한, 이 문서의 최신 개정판은 2014년에 발표된 이전 판을 대체하며, 기술 재검토가 이루어져 최신 기술 동향과 일치하도록 업데이트되었습니다. 특히, 이 표준은 IEC TS 62627-09와의 용어 및 정의의 조화를 이루는 등의 중요한 기술 변경 사항을 포함하고 있으며, 이는 사용자와 제조업체 간의 의사소통을 더욱 명확히 해줍니다. 또한 제4항의 요구 사항 변경은 전반적인 성능 및 안정성을 더욱 강화하여 광섬유 소극적 색차 보상 장치의 신뢰성 및 효율성을 높이는 데 기여합니다. 결과적으로 IEC 61978-1:2024는 현대의 광통신 시스템에서 필수적인 역할을 하며, 구축 시 명확한 규정을 제공하여 산업 전반의 발전을 뒷받침하는 중요한 표준입니다.
Die Norm IEC 61978-1:2024 legt die Spezifikationen für passive chromatische Dispersion-Kompensatoren in der Glasfaserkommunikation fest und beschreibt umfassend deren Anforderungen und Eigenschaften. Der Geltungsbereich dieser Norm umfasst alle optisch passiven Komponenten, die über einen optischen Eingang und einen optischen Ausgang verfügen, um optische Energie zu übertragen. Die Ports bestehen entweder aus Glasfasern oder Glasfaseranschlüssen, was die Integration in bestehende Systeme erleichtert. Ein besonderes Augenmerk gilt der Wellenlängensensitivität dieser Geräte, was für moderne Anwendungen in der Lichtwellenleitertechnologie von entscheidender Bedeutung ist. Zudem wird die Polarsensitivität angesprochen, ein Aspekt, der in vielen Anwendungen von Bedeutung ist, um die Leistung und Effizienz des Signals zu maximieren. Die Stärken der Norm liegen in der Einführung einheitlicher Anforderungen, die die Qualität und Zuverlässigkeit der passiven chromatischen Dispersion-Kompensatoren sicherstellt. Mit dieser vierten Auflage wird die Kontinuität in der Entwicklung von Standards gewahrt, während bedeutende technische Änderungen vorgenommen wurden. Die Harmonisierung von Begriffen und Definitionen mit der IEC TS 62627-09 fördert ein besseres Verständnis und eine klare Kommunikation zwischen Herstellern und Anwendern im Bereich der Glasfasertechnologie. Zusätzlich wurden die Anforderungen in Klausel 4 überarbeitet, was zu einer verbesserten Klarheit und Anwendbarkeit der Norm führt. Die Revision stellt sicher, dass die Norm den neuesten technologischen Fortschritten und den sich ändernden Anforderungen des Marktes gerecht wird. Insgesamt zeigt die IEC 61978-1:2024, wie wichtig es ist, sich kontinuierlich an die Entwicklungen in der Lichtwellenleitertechnologie anzupassen und zeitgemäße Standards zu schaffen, die die Effizienz und Leistungsfähigkeit von optischen Netzwerken unterstützen.
Die Norm IEC 61978-1:2024 befasst sich mit passiven chromatischen Dispersion-Kompensatoren für Glasfaseranwendungen. Der Anwendungsbereich dieser Norm umfasst sämtliche optisch passiven Geräte, die über einen optischen Eingang und einen optischen Ausgang zur Übertragung optischer Energie verfügen. Diese Geräte sind durch ihre Empfindlichkeit gegenüber Wellenlängen sowie potenzielle Empfindlichkeit gegenüber Polarisation gekennzeichnet. Die Norm legt einheitliche Anforderungen für diese passiven chromatischen Dispersion-Kompensatoren fest. Eine der Stärken der IEC 61978-1:2024 liegt in ihrer technischen Überarbeitung im Vergleich zur vorherigen Auflage von 2014. Die harmonisierten Begriffe und Definitionen mit der IEC TS 62627-09 tragen zu einer höheren Klarheit und Verständnis in der Fachwelt bei. Insbesondere die überarbeitete Klausel 4, die die Anforderungen an die Geräte präzisiert, stellt eine wesentliche Verbesserung dar. Die Relevanz dieser Norm ergibt sich aus der steigenden Nachfrage nach effizienten Lösungen zur Minimierung der chromatischen Dispersion in optischen Netzwerken. In einer Zeit, in der die Datenübertragungsgeschwindigkeiten konstant steigen und die Anforderungen an die Netzwerkleistung wachsen, ist die Standardisierung aktiv relevanter, um Konsistenz und Qualität in der Herstellung passiver Komponenten zu gewährleisten. Durch die Einführung dieser vierten Auflage wird nicht nur die Qualität der Produkte verbessert, sondern auch die Zusammenarbeit zwischen Herstellern und Anwendern gefördert, was zu einem effektiveren Einsatz der Technologie führt. Die Norm IEC 61978-1:2024 ist somit ein unverzichtbares Dokument für alle, die im Bereich der optischen Kommunikationssysteme tätig sind und auf eine zuverlässige Leistung der passiven chromatischen Dispersion-Kompensatoren angewiesen sind.
IEC 61978-1:2024 establishes a comprehensive framework for the specification of fibre optic passive chromatic dispersion compensators, solidifying its relevance in the realm of optical communications. The standard's scope specifically addresses devices that are optically passive and include essential features such as having an optical input and output for the transmission of optical power through optical fibres or connectors. This level of detail categorically ensures that developers and manufacturers have a clear guideline for creating equipment that meets the needs of contemporary fibre optic systems. One of the standout strengths of IEC 61978-1:2024 is its focus on providing wavelength-sensitive and potentially polarization-sensitive specifications. This aspect is particularly crucial as it aligns with the complex demands of modern telecommunications where wavelength division multiplexing is increasingly prevalent. Such functionality supports improved network performance and reliability, making the standard extremely pertinent in today's high-speed data transmission environments. Moreover, the 2024 revision harmonizes terminology and definitions with IEC TS 62627-09, which is an essential step toward ensuring consistency and clarity across related standards. By updating Clause 4 to enhance the requirements, the document addresses contemporary challenges faced in fibre optic technology, reflecting current advancements and facilitating better understanding among users. In summary, IEC 61978-1:2024 not only sets uniform specifications for passive chromatic dispersion compensators but also elevates the standard's relevance by incorporating the latest technological developments and harmonizing with other related regulations. This makes it an essential resource for stakeholders in the fibre optic industry seeking to ensure compliance and optimize the performance of their devices.
IEC 61978-1:2024 provides a comprehensive generic specification for fibre optic passive chromatic dispersion compensators. The scope of this standard encompasses all devices that are optically passive and designed to transmit optical power through defined inputs and outputs, specifically utilizing optical fibres or connectors. By establishing uniform requirements, IEC 61978-1:2024 plays a crucial role in ensuring compatibility and performance consistency within the fibre optic industry. One of the significant strengths of this standard lies in its emphasis on wavelength sensitivity, addressing a vital aspect of chromatic dispersion in optical communications. Furthermore, the ability of these compensators to be polarization sensitive adds another layer of adaptability within various applications, making it a critical reference for manufacturers and engineers. The fourth edition has seen notable updates, including the harmonization of terms and definitions with IEC TS 62627-09, which is essential for maintaining consistency across related standards. Moreover, the revision of Clause 4 regarding requirements strengthens the framework set out in previous editions, ensuring that the specifications meet current industry needs. Overall, IEC 61978-1:2024 effectively reflects the technological advancements and evolving requirements in the field of fibre optic passive chromatic dispersion compensators, making it a relevant and vital standard for professionals in the industry.
La norme IEC 61978-1:2024 constitue un document fondamental pour le secteur des dispositifs de connexion à fibre optique et des composants passifs. Cette norme s'applique spécifiquement aux compensateurs de dispersion chromatique passive en fibre optique, qui se caractérisent par un ensemble de fonctionnalités essentielles. En tant que norme optiquement passive, elle définit les exigences uniformes nécessaires pour garantir la performance et la fiabilité de ces compensateurs. Parmi les points forts de la norme IEC 61978-1:2024, on note sa précision dans la description des caractéristiques techniques. Les compensateurs décrits sont non seulement passifs, mais offrent également un point d'entrée et un point de sortie optiques pour la transmission de puissance optique, ce qui est crucial pour le bon fonctionnement des réseaux de communication optique. De plus, l'indication que ces dispositifs sont sensibles à la longueur d'onde et potentiellement sensibles à la polarisation souligne leur application dans des environnements techniques variés où les performances doivent être optimales. La mise à jour de cette quatrième édition, qui remplace la troisième édition de 2014, intègre des révisions techniques significatives. La harmonisation des termes et définitions avec la norme IEC TS 62627-09 constitue un atout indéniable pour la compréhension et l'application de ces technologies au sein de l'industrie. Le changement dans le clause 4, relatif aux exigences, reflète également une volonté d'adaptation aux évolutions technologiques et aux nouvelles attentes des utilisateurs. En somme, la norme IEC 61978-1:2024 est d'une grande pertinence pour les professionnels du secteur, car elle établit des exigences claires et normalisées pour les compensateurs de dispersion chromatique passive en fibre optique, facilitant ainsi l'innovation et le déploiement efficace de solutions de communication optique avancées.
IEC 61978-1:2024 표준은 광섬유 수동 분산 보상 장치에 대한 포괄적인 사양을 제시하며, 이는 광섬유 통신 분야에서 매우 중요한 역할을 합니다. 이 표준의 주요 범위는 광학적으로 수동이며, 광학 입력과 출력을 통해 광학적인 전력을 전송할 수 있는 장치에 대한 것입니다. 여기서 사용되는 포트는 광섬유 또는 광섬유 커넥터로 이루어져 있으며, 이는 파장 및 편극에 민감하다는 특징을 가지고 있습니다. 이 표준의 강점 중 하나는 최신 기술 변경 사항을 포함하고 있다는 점입니다. 2024년 판에서는 IEC TS 62627-09와의 용어 및 정의의 조화를 이루어 보다 일관된 기술 언어를 제공하고, 요구 사항을 명확하게 하기 위해 제4조의 내용을 수정했습니다. 이러한 업데이트는 업계 전문가들이 보다 정확하고 일관된 방식으로 기술을 적용하는 데 기여합니다. 또한 IEC 61978-1:2024는 기존의 2014년에 발표된 제3판을 대체하며, 이 기술 개정판은 수동 분산 보상 장치의 설계 및 구현 과정에서의 표준화를 강화합니다. 이러한 표준의 적절한 적용은 광섬유 통신 시스템의 성능과 신뢰성을 높이는 데 필수적입니다. 결론적으로, IEC 61978-1:2024 표준은 광섬유 수동 분산 보상 장치에 대한 일관성 있는 요구 사항을 정립하며, 이를 통해 기초 데이터 전송의 질을 개선하고 업계의 통신 성능을 향상시키는 데 기여합니다.
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