SIST EN IEC 61280-4-3:2022
(Main)Fibre-optic communication subsystem test procedures - Part 4-3: Installed passive optical networks - Attenuation and optical return loss measurements (IEC 61280-4-3:2022)
Fibre-optic communication subsystem test procedures - Part 4-3: Installed passive optical networks - Attenuation and optical return loss measurements (IEC 61280-4-3:2022)
IEC 61280-4-3: 2022 describes the measurement of attenuation, optical return loss and optical power in installed passive optical networks (PONs) using single-mode fibre. This document specifies two methods for measuring the attenuation before activation of the PON:
- method A: one-cord method using a light source and a power meter (LSPM);
- method B: optical time-domain reflectometer (OTDR) method in upstream direction only, with reduction of uncertainties due to the variation of backscatter coefficient.
In addition, method C, which is described in informative Annex C, provides an estimate of the attenuation after partial activation of the PON by using a U band filtered optical time-domain reflectometer (FOTDR) in an upstream direction.
This publication contains an attached file titled "Supplemental Data" in the form of an Excel spread sheet. This file is intended to be used as a complement and does not form an integral part of the standard.
Prüfverfahren für Lichtwellenleiter-Kommunikationsuntersysteme - Teil 4-3: Installierte passive optische Netze - Messung von Dämpfung und optischer Rückflussdämpfung (IEC 61280-4-3:2022)
Procédures d’essai des sous-systèmes de télécommunications fibroniques - Partie 4-3: Installations de réseau optique passif - Mesures de l’affaiblissement et de l’affaiblissement de réflexion optique (IEC 61280-4-3:2022)
IEC 61280-4-3: 2022 décrit la mesure de l’affaiblissement, de l’affaiblissement de réflexion optique et de la puissance optique dans des installations de réseau optique passif (PON) utilisant de la fibre unimodale. Le présent document spécifie deux méthodes pour mesurer l’affaiblissement avant l’activation du PON:
- méthode A: méthode à cordon unique utilisant une source optique et un mesureur de puissance (LSPM);
- méthode B: méthode au réflectomètre optique dans le domaine temporel (OTDR), uniquement dans le sens ascendant, offrant une réduction des incertitudes associées à la variation du coefficient de rétrodiffusion.
En outre, une méthode C, décrite à l’Annexe C informative, donne une estimation de l’affaiblissement après activation partielle du PON, en utilisant un réflectomètre optique dans le domaine temporel à port filtré (FOTDR, Filtered Optical Time-Domain Reflectometer), fonctionnant sur la bande U dans le sens ascendant.
Cette publication contient un fichier joint intitulé "Données complémentaires", sous forme de feuille de calcul Excel. Ce fichier est destiné à être utilisé comme complément, et ne fait pas partie intégrante de la norme.
Postopki preskušanja optičnega komunikacijskega podsistema - 4-3. del: Vgrajena pasivna optična omrežja - Meritve slabljenja in optičnih povratnih izgub (IEC 61280-4-3:2022)
Ta del standarda IEC 61280 opisuje meritve slabljenja, optične povratne izgube in optične moči v nameščenih pasivnih optičnih omrežjih (PON) z enorodnimi vlakni. Ta dokument določa dve metodi merjenja slabljenja pred aktiviranjem PON: • metoda A: enorodna metoda z uporabo vira svetlobe in merilnika moči (LSPM); • metoda B: metoda optičnega reflektometra v časovni domeni (OTDR) samo v smeri proti toku, z zmanjšanjem negotovosti zaradi variacije koeficienta povratnega razprševanja. Poleg tega metoda C, ki je opisana v informativnem dodatku C, zagotavlja oceno slabljenja po delni aktivaciji PON z uporabo optičnega reflektometra v časovni domeni (FOTDR) s filtriranim pasom U v smeri proti toku.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2022
Postopki preskušanja optičnega komunikacijskega podsistema - 4-3. del: Vgrajena
pasivna optična omrežja - Meritve slabljenja in optičnih povratnih izgub (IEC 61280
-4-3:2022)
Fibre-optic communication subsystem test procedures - Part 4-3: Installed passive
optical networks - Attenuation and optical return loss measurements (IEC 61280-4-
3:2022)
Prüfverfahren für Lichtwellenleiter-Kommunikationsuntersysteme - Teil 4-3: Installierte
passive optische Netze - Messung von Dämpfung und optischer Rückflussdämpfung
(IEC 61280-4-3:2022)
Procédures d’essai des sous-systèmes de télécommunications fibroniques - Partie 4-3:
Installations de réseau optique passif - Mesures de l’affaiblissement et de
l’affaiblissement de réflexion optique (IEC 61280-4-3:2022)
Ta slovenski standard je istoveten z: EN IEC 61280-4-3:2022
ICS:
33.180.01 Sistemi z optičnimi vlakni na Fibre optic systems in
splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 61280-4-3
NORME EUROPÉENNE
EUROPÄISCHE NORM September 2022
ICS 33.180.01
English Version
Fibre optic communication subsystem test procedures - Part 4-3:
Installed passive optical networks - Attenuation and optical
return loss measurements
(IEC 61280-4-3:2022)
Procédures d'essai des sous-systèmes de Prüfverfahren für Lichtwellenleiter-
télécommunications fibroniques - Partie 4-3: Installations de Kommunikationsuntersysteme - Teil 4-3: Installierte passive
réseau optique passif - Mesures de l'affaiblissement et de optische Netze - Messung von Dämpfung und optischer
l'affaiblissement de réflexion optique Rückflussdämpfung
(IEC 61280-4-3:2022) (IEC 61280-4-3:2022)
This European Standard was approved by CENELEC on 2022-09-02. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61280-4-3:2022 E
European foreword
The text of document 86C/1749A/CDV, future edition 1 of IEC 61280-4-3, prepared by SC 86C "Fibre
optic systems and active devices" of IEC/TC 86 "Fibre optics" was submitted to the IEC-CENELEC
parallel vote and approved by CENELEC as EN IEC 61280-4-3:2022.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2023-06-02
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2025-09-02
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61280-4-3:2022 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 60875-1:2015 NOTE Harmonized as EN 60875-1:2015 (not modified)
IEC 61280-1-1 NOTE Harmonized as EN 61280-1-1
IEC 61746-2 NOTE Harmonized as EN 61746-2
1 2
IEC 61755-3-1 NOTE Harmonized as EN 61755-3-1
3 4
IEC 61755-3-2 NOTE Harmonized as EN 61755-3-2
IEC 62074-1:2014 NOTE Harmonized as EN 62074-1:2014 (not modified)
Under preparation. Stage at the time of publication: IEC 61755-3-1/CD:2022.
Under preparation. Stage at the time of publication: prEN IEC 61755-3-1:2020.
Under preparation. Stage at the time of publication: IEC 61755-3-2/CD:2022.
Under preparation. Stage at the time of publication: prEN IEC 61755-3-2:2020.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the
relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60793-2-50 - Optical fibres - Part 2-50: Product EN IEC 60793-2-50 -
specifications - Sectional specification for
class B single-mode fibres
IEC 61280-1-3 - Fibre optic communication subsystem test EN IEC 61280-1-3 -
procedures - Part 1-3: General
communication subsystems -
Measurement of central wavelength,
spectral width and additional spectral
characteristics
IEC 61280-4-2 - Fibre-optic communication subsystem test EN 61280-4-2 -
procedures - Part 4-2: Installed cable plant
- Single-mode attenuation and optical
return loss measurement
IEC/TR 61282-14 2019 Fibre optic communication system design - -
guidelines - Part 14: Determination of the
uncertainties of attenuation measurements
in fibre plants
IEC 61300-3-35 - Fibre optic interconnecting devices and EN 61300-3-35 -
passive components - Basic test and
measurement procedures - Part 3-35:
Examinations and measurements - Visual
inspection of fibre optic connectors and
fibre-stub transceivers
IEC 61315 - Calibration of fibre-optic power meters EN IEC 61315 -
IEC 61746-1 2009 Calibration of optical time-domain EN 61746-1 2011
reflectometers (OTDR) - Part 1: OTDR for
single mode fibres
+ AC 2014
IEC 61753-031-2 - Fibre optic interconnecting devices and EN 61753-031-2 -
passive components - Performance
standard - Part 031-2: Non-connectorized
single-mode 1 × N and 2 × N non-
wavelength-selective branching devices for
Category C - Controlled environment
IEC 61753-031-3 - Fibre optic interconnecting devices and EN 61753-031-3 -
passive components - Performance
standard - Part 031-3: Non-connectorized
single-mode 1×N and 2×N non-
wavelength-selective branching devices for
Category U - Uncontrolled environment
IEC 61753-031-6 - Fibre optic interconnecting devices and EN 61753-031-6 -
passive components - Performance
standard - Part 031-6: Non-connectorized
single-mode 1×N and 2×N non-
wavelength-selective branching devices for
Category O - Uncontrolled environment
IEC 61753-1 - Fibre optic interconnecting devices and EN IEC 61753-1 -
passive components - Performance
standard - Part 1: General and guidance
IEC/TR 62627-01 - Fibre optic interconnecting devices and - -
passive components - Part 01: Fibre optic
connector cleaning methods
IEC 61280-4-3 ®
Edition 1.0 2022-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic communication subsystem test procedures –
Part 4-3: Installed passive optical networks – Attenuation and optical return loss
measurements
Procédures d’essai des sous-systèmes de télécommunications fibroniques –
Partie 4-3: Installations de réseau optique passif – Mesures de l’affaiblissement
et de l’affaiblissement de réflexion optique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.01 ISBN 978-2-8322-4801-0
– 2 – IEC 61280-4-3:2022 © IEC 2022
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms, definitions, and abbreviated terms . 10
3.1 Terms and definitions . 10
3.2 Abbreviated terms . 12
4 Basic PON architecture . 13
5 Attenuation measurement . 13
5.1 General . 13
5.2 Methods . 14
5.3 Cabling configurations . 14
5.4 RTM for attenuation measurement . 14
6 Apparatus for attenuation measurement . 14
6.1 General . 14
6.2 Light source . 15
6.2.1 Stability . 15
6.2.2 Light source spectral characteristics . 15
6.3 Launch cord . 15
6.4 Receive or tail cord . 15
6.5 Power meter – LSPM method only . 16
6.6 OTDR apparatus . 16
6.6.1 General . 16
6.6.2 OTDR spectral characteristics . 16
6.7 Connector end face cleaning and inspection equipment . 17
7 Overview of uncertainties . 17
7.1 General . 17
7.2 Typical uncertainty values for method A . 17
7.3 Typical uncertainty values for method B . 18
8 Optical return loss measurements. 19
8.1 General . 19
8.2 ORL measurements using CW . 19
8.3 Reflectance measurement using an OTDR . 19
Annex A (normative) LSPM one-cord reference method . 20
A.1 Applicability of test method . 20
A.2 Apparatus . 20
A.3 Procedure . 20
A.4 Calculation . 21
A.5 Components of reported attenuation . 21
Annex B (normative) Optical time-domain reflectometer method . 22
B.1 Applicability of test method . 22
B.2 Apparatus . 22
B.2.1 General . 22
B.2.2 OTDR . 22
B.2.3 Test cords . 22
B.3 Procedure (test method) . 23
IEC 61280-4-3:2022 © IEC 2022 – 3 –
B.4 Calculation of attenuation . 24
B.4.1 General . 24
B.4.2 Connection location . 24
B.4.3 Definition of the power levels F and F . 25
1 2
B.5 Testing launch and tail cords . 25
B.5.1 General . 25
B.5.2 Launch and tail cords test procedure . 26
Annex C (informative) Filtered optical time-domain reflectometer . 27
C.1 General . 27
C.2 Applicability of the method . 27
C.3 Apparatus . 27
C.3.1 FOTDR . 27
C.3.2 Test cords . 27
C.4 Test method . 28
C.5 Calculation of attenuation . 28
C.5.1 General . 28
C.5.2 Connection location . 29
C.5.3 Definition of the power levels F and F . 29
1 2
C.6 Uncertainties. 30
C.7 Consideration relative to the measurement of an unused branch of the ODN
while at least one branch is active . 31
C.7.1 Context . 31
C.7.2 Evaluation of the risk of perturbation of the network. 31
Annex D (informative) PON configuration . 33
D.1 General . 33
D.2 Basic configuration . 33
D.3 Coexistence of different PON systems . 34
D.4 Wavelength multiplexing . 35
Annex E (informative) Basic uncertainty analysis for methods B and C . 37
E.1 General . 37
E.2 Uncertainties due to measuring instrument . 37
E.3 Uncertainties due to the setup . 38
E.4 Uncertainties due to cabling . 39
E.5 Relative uncertainty arising from the uncertainty of the OTDR wavelength . 39
E.5.1 Impact of the lack of knowledge of the wavelength of the OTDR . 39
E.5.2 Impact of using wavelength in the U band . 40
E.6 Relative uncertainty arising from non-linearity of the OTDR . 41
E.7 Uncertainty arising from OTDR noise . 41
E.7.1 General . 41
E.7.2 Linear regression . 42
E.7.3 Practical determination of uncertainty arising from OTDR noise . 44
E.8 Relative uncertainty arising from OTDR cursor placement . 47
E.9 Considerations on backscatter coefficient . 47
E.10 Sensitivity coefficients . 48
E.10.1 General . 48
E.10.2 Sensitivity coefficients values . 48
E.10.3 Sensitivity for relative uncertainty arising from OTDR noise (tail
regression) . 49
Annex F (informative) OTDR configuration information . 51
– 4 – IEC 61280-4-3:2022 © IEC 2022
F.1 General . 51
F.2 Fundamental parameters that define the operational capability of an OTDR . 52
F.2.1 Dynamic range . 52
F.2.2 Dynamic margin . 52
F.2.3 Pulse width . 52
F.2.4 Averaging time . 52
F.2.5 Dead zone . 52
F.2.6 Distance sampling . 53
Bibliography . 54
Figure 1 – Single stage conventional ODN structure . 13
Figure 2 – Cabling configuration – Start and end of measured losses in reference test
method . 14
Figure 3 – Typical OTDR schematic . 16
Figure A.1 – One-cord reference measurement . 21
Figure A.2 – One-cord test measurement . 21
Figure B.1 – Test measurement for method B . 23
Figure B.2 – Location of the connector ports of the cabling under test . 24
Figure B.3 – Graphic determination of F and F . 25
1 2
Figure C.1 – Location of the connector ports of the cabling under test . 28
Figure C.2 – Graphic determination of F and F . 30
1 2
Figure C.3 – OLT structure and signal wavelengths . 31
Figure C.4 – WDM filter response . 32
Figure D.1 – Single stage conventional ODN structure . 33
Figure D.2 – Multiple stage conventional ODN structure . 34
Figure D.3 – Implementation of coexistence PON systems . 34
Figure D.4 – Single-stage PtP WDM ODN structure . 35
Figure D.5 – Multiple-stage PtP WDM ODN structure . 36
Figure D.6 – Example of ODN structure for TWDM . 36
Figure E.1 – Observed PLC splitter wavelength dependency and mathematical model . 40
Figure E.2 – Spectral attenuation . 40
Figure E.3 – Linear regression location for each measurement method . 42
Figure E.4 – Confidence band of the linear regression . 43
Figure E.5 – OTDR trace and noise . 44
Figure E.6 – Noise asymmetry function of DM . 46
Figure E.7 – Measurement validity limits . 47
Figure E.8 – Graphic representation of the amplification of the confidence interval . 50
Table 1 – Light source spectral requirements . 15
Table 2 – OTDR spectral requirements . 17
Table 3 – Uncertainty for a given attenuation at 1 310 nm and 1 550 nm using the
same photodetector . 18
Table 4 – Uncertainty for a given attenuation at 1 310 nm and 1 550 nm using different
photodetectors . 18
Table 5 – Uncertainty for a given attenuation at 1 310 nm and 1 550 nm using OTDR. 19
IEC 61280-4-3:2022 © IEC 2022 – 5 –
Table C.1 – Uncertainty for a given attenuation at 1 625 nm and 1 650 nm using OTDR . 31
Table E.1 – Uncertainties due to measuring instruments . 38
Table E.2 – Uncertainties due to the setup . 38
Table E.3 – Uncertainties due to cabling . 39
Table E.4 – Difference of attenuation coefficient . 41
Table E.5 – Sensitivity coefficients . 49
– 6 – IEC 61280-4-3:2022 © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC COMMUNICATION SUBSYSTEM TEST PROCEDURES –
Part 4-3: Installed passive optical networks –
Attenuation and optical return loss measurements
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.
IEC 61280-4-3 has been prepared by subcommittee 86C: Fibre optic systems and active
devices, of IEC technical committee 86: Fibre optics. It is an International Standard.
This publication contains an attached file titled "Supplemental Data" in the form of an Excel
spread sheet. This file is intended to be used as a complement and does not form an integral
part of the standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
86C/1749A/CDV 86C/1787/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
IEC 61280-4-3:2022 © IEC 2022 – 7 –
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 61280 series, published under the general title Fibre optic
communication subsystem test procedures, 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,
• replaced by a revised edition, or
• amended.
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.
– 8 – IEC 61280-4-3:2022 © IEC 2022
INTRODUCTION
IEC has developed a large set of standards for measurement of fibre optic cable plants. These
standards are applicable to passive optical networks (PONs) if specifics of these networks are
known and understood. This document provides dedicated procedures for attenuation
measurements in PONs as well as additional information.
For the purpose of this document, a PON is a point-to-multipoint network that includes optical
line terminals (OLTs), optical network terminals (ONTs), and an optical fibre infrastructure that
is entirely passive and is represented by a single-rooted point-to-multipoint tree of optical fibres
with splitters, combiners, filters, and other passive components.
PONs are commonly used in fibre-to-the-home (FTTH) and fibre-to-the-building (FTTB) optical
access networks (OAN). In addition, the measurement principles described in this document
may also apply to PONs used in other applications, like passive optical local area networks
(PO-LANs).
IEC 61280-4-3:2022 © IEC 2022 – 9 –
FIBRE OPTIC COMMUNICATION SUBSYSTEM TEST PROCEDURES –
Part 4-3: Installed passive optical networks –
Attenuation and optical return loss measurements
1 Scope
This part of IEC 61280 describes the measurement of attenuation, optical return loss and optical
power in installed passive optical networks (PONs) using single-mode fibre.
This document specifies two methods for measuring the attenuation before activation of the
PON:
• method A: one-cord method using a light source and a power meter (LSPM);
• method B: optical time-domain reflectometer (OTDR) method in upstream direction only,
with reduction of uncertainties due to the variation of backscatter coefficient.
In addition, method C, which is described in informative Annex C, provides an estimate of the
attenuation after partial activation of the PON by using a U band filtered optical time-domain
reflectometer (FOTDR) in an upstream direction.
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 60793-2-50, Optical fibres – Part 2-50: Product specifications – Sectional specification for
class B single-mode fibres
IEC 61280-1-3, Fibre-optic communication subsystem test procedures – Part 1-3: General
communication subsystems – Measurement of central wavelength, spectral width and additional
spectral characteristics
IEC 61280-4-2, Fibre-optic communication subsystem test procedures – Part 4-2: Installed
cable plant – Single-mode attenuation and optical return loss measurement
IEC TR 61282-14:2019, Fibre optic communication system design guidelines – Part 14:
Determination of the uncertainties of attenuation measurements in fibre plants
IEC 61300-3-35, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-35: Examinations and measurements – Visual inspection of
fibre optic connectors and fibre-stub transceivers
IEC 61315, Calibration of fibre-optic power meters
IEC 61746-1:2009, Calibration of optical time-domain reflectometers (OTDR) – Part 1: OTDR
for single-mode fibres
IEC 61753-031-2, Fibre optic interconnecting devices and passive components – Performance
standard – Part 031-2: Non-connectorized single-mode 1 × N and 2 × N non-wavelength-
selective branching devices for Category C − Controlled environment
– 10 – IEC 61280-4-3:2022 © IEC 2022
IEC 61753-031-3, Fibre optic interconnecting devices and passive components – Performance
standard – Part 031-3: Non-connectorized single-mode 1 × N and 2 × N non-wavelength-
selective branching devices for Category U − Uncontrolled environment
IEC 61753-031-6, Fibre optic interconnecting devices and passive components − Performance
standard − Part 031-6: Non-connectorized single-mode 1 × N and 2 × N non-wavelength-
selective branching devices for Category O − Uncontrolled environment
IEC 61753-1, Fibre optic interconnecting devices and passive components – Performance
standard – Part 1: General and guidance
IEC TR 62627-01, Fibre optic interconnecting devices and passive components – Part 01: Fibre
optic connector cleaning methods
3 Terms, definitions, and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions 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
3.1.1
attenuation
L
reduction of optical power induced by transmission through a medium such as cabling
L = 10 log (P /P )
dB 10 in out
where
P and P are the power, typically measured in mW, into and out of the cabling
in out
Note 1 to entry: Attenuation is expressed in dB.
Note 2 to entry: Loss and attenuation are equivalent
3.1.2
coexistence element
CoEx
bidirectional functional element used to connect different PON systems, as defined in different
ITU-T Recommendation series, to the same ODN
[SOURCE: ITU-T G.989:2015, clause 3.2.1.6, modified for use in this document]
3.1.3
light source power meter
LSPM
test system consisting of a light source (LS), power meter (PM) and associated test cords used
to measure the attenuation of installed cable plant
IEC 61280-4-3:2022 © IEC 2022 – 11 –
3.1.4
non-wavelength-selective branching device
(optical) coupler
(optical) splitter
bidirectional passive component with three or more optical fibre or optical connector ports that
operates as a passive component in that it contains no optoelectronic or other transducing
elements
Note 1 to entry: There are three or more ports for the entry and/or exit of optical power, which is shared among
these ports in a pre-determined fashion.
[SOURCE: IEC 60875-1:2015, 3.2.1, modified for use in this document]
3.1.5
optical access network
OAN
set of access links sharing the same network-side interfaces and supported by optical access
transmission systems
Note 1 to entry: The OAN can include a number of ODNs connected to the same OLT.
3.1.6
optical distribution network
ODN
point-to-multipoint optical fibre infrastructure
Note 1 to entry: A simple ODN is entirely passive and is represented by a single-rooted point-to-multipoint tree of
optical fibres with splitters, combiners, filters, and possibly other passive optical components.
3.1.7
optical return loss
ORL
R
ORL
ratio of the input power (P ) of the cabling under test to the backward power (P ) reflected by
in r
the cabling under test:
R
= 10 log (P / P )
ORL 10 in r
Note 1 to entry: R is expressed in dB.
ORL
Note 2 to entry: R is a positive number.
ORL
3.1.8
optical time-domain reflectometer
OTDR
test system consisting of an optical time-domain reflectometer and associated test cords used
to characterize and measure the attenuation and optical return loss of installed cable plant and
specific elements within that cable plant
3.1.9
point-to-point wavelength division multiplexing passive optical network
PtP WDM PON
multiple wavelength PON solution that provides a dedicated wavelength per optical network unit
(ONU) in both downstream and upstream directions
Note 1 to entry: The defining characteristic of a PtP WDM PON is that each ONU is served by one or more dedicated
wavelengths.
– 12 – IEC 61280-4-3:2022 © IEC 2022
3.1.10
passive optical network
PON
combination of network elements in an ODN-based optical access network that includes an OLT
and one or more ONUs and implements a particular coordinated suite of physical medium
dependent layer, transmission convergence layer, and management protocols
3.1.11
reference test method
RTM
test method for measuring a given characteristic strictly according to the definition of this
characteristic, and giving results which are accurate, reproducible, and relatable to practical
use
[SOURCE: IEC TR 61931:1998, 2.8.1, modified – The words in brackets, "for optical fibres",
have been omitted from the term.]
3.1.12
reflectance
R
ratio of the reflected power (in watts), to the incident power (in watts), at a discrete location in
a fibre optic component
Note 1 to entry: R is expressed in dB.
Note 2 to entry: R is given by the following formula:
P
refl
R = 10 log
P
inc
Note 3 to entry: Reflectance values are negative.
3.1.13
time and wavelength division multiplexing passive optical network
TWDM PON
multiple wavelength PON solution in which each wavelength is shared between multiple optical
network units (ONUs) by employing time division multiplexing and multiple access mechanisms
3.1.14
wavelength-selective branching device
wavelength division multiplexer / de-multiplexer
WDM device
passive component with three or more ports that shares optical power among its ports in a
predetermined fashion, without any amplification or other active modulation but only depending
on wavelength, in the sense that at least two different wavelength ranges are nominally
transferred between two different pairs of ports
[SOURCE: IEC 62074-1:2014, 3.2.1]
3.2 Abbreviated terms
APC angled physical contact (description of connector style)
ATM alternative test method
CW continuous wave
FTTB fibre-to-the-building
FTTH fibre-to-the-home
LSA least squares approximation
IEC 61280-4-3:2022 © IEC 2022 – 13 –
LS light source
OLT optical line terminal
ONT optical network terminal
ONU optical network unit
PC physical contact (description of connector style that is not angled)
PDL polarization-dependent loss
PLC planar lightwave circuit
PM power meter
RTM reference test method
TWDM time wavelength division multiplexing
WDM wavelength division multiplexing
4 Basic PON architecture
Figure 1 shows the basic architecture of a PON. Refer to Annex D for more details on PON
configurations.
Directions are defined as "downstream direction" when the signal is transmitted from the OLT
to the ONT, and "upstream direction" when the signal is transmitted from the ONT to the OLT.
Key
OLT optical line terminal
ODN optical distribution network
ONT optical network terminal
S non-wavelength-selective branching device
Figure 1 – Single stage conventional ODN structure
5 Attenuation measurement
5.1 General
Measuring the attenuation in a PON is more challenging than measuring attenuation in installed
point-to-point cable plants for the following reasons:
• PONs often do not follow the traditional installation sequence of point-to-point cable plants,
so that some parts of the PON can be still under construction while other parts are already
in service;
• the particular structure of PONs makes the use of certain traditional measurement
techniques, like OTDR measurements in the downstream direction, more complicated;
• the wavelengths to be used for attenuation measurements should be as close as possible
to the wavelengths used by the transmission equipment, which can be different from the
basic 1 310 nm and 1 550 nm wavelengths used in measurements of point-to-point cable
plants.
– 14 – IEC 61280-4-3:2022 © IEC 2022
To acc
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...