IEC 61280-1-3:2021

Fibre optic communication subsystem test procedures - Part 1-3: General communication subsystems - Measurement of central wavelength, spectral width and additional spectral characteristics

IEC 61280-1-3:2021 provides definitions and measurement procedures for several wavelength and spectral width properties of an optical spectrum associated with a fibre optic communication subsystem, an optical transmitter, or other light sources used in the operation or test of communication subsystems. This document also provides definitions and measurement procedures for side-mode suppression ratio and signal-to-source spontaneous emission ratio. The measurement is done for the purpose of system construction and/or maintenance. In the case of communication subsystem signals, the optical transmitter is typically under modulation. NOTE Different properties can be appropriate to different spectral types, such as continuous spectra characteristics of light-emitting diodes (LEDs), as well as multilongitudinal-mode (MLM), multitransverse-mode (MTM) and single-longitudinal mode (SLM) spectra, which are characteristic of laser diodes (LDs). This third edition cancels and replaces the second edition published in 2010. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- addition of measurement of signal-to-source spontaneous emission ratio in 8.9;
- change of document title to reflect the additional measurement;
- additional information on the resolution bandwidth used in the measurement of the side-mode suppression ratio in 8.8;
- use of a calibrated optical wavelength meter for accurate wavelength measurements of single-longitudinal mode lasers.

Procédures d'essai des sous-systèmes de télécommunication fibroniques - Partie 1-3: Sous-systèmes généraux de télécommunication - Mesure de la longueur d'onde centrale, de la largeur spectrale et des caractéristiques spectrales supplémentaires

IEC 61280-1-3:2021 fournit des définitions et des procédures de mesure pour plusieurs propriétés de longueur d’onde et de largeur spectrale d’un spectre optique associées à un sous-système de télécommunication fibronique, un émetteur optique ou d’autres sources de lumière utilisées pour l’exploitation ou les essais des sous-systèmes de télécommunication. Le présent document fournit également des définitions et des procédures de mesure du rapport de suppression des modes latéraux et du taux d’émission spontanée entre signal et source. Le mesurage est effectué pour les besoins de la construction et/ou de la maintenance d'un système. Dans le cas des signaux dans les sous-systèmes de télécommunication, l’émetteur optique fonctionne généralement en modulation. NOTE Des propriétés différentes peuvent être appropriées pour des types de spectres différents, telles que les caractéristiques spectrales continues des diodes électroluminescentes (LED), les spectres de mode multilongitudinal (MLM), de mode multitransversal (MTM) et unimodal longitudinal (SLM), qui sont caractéristiques des diodes lasers (LD).
Cette troisième édition annule et remplace la deuxième édition parue en 2010. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- ajout du mesurage du taux d’émission spontanée entre signal et source en 8.9;
- modification du titre du document pour tenir compte du mesurage supplémentaire;
- information supplémentaire relative à la résolution spectrale utilisée pour le mesurage du rapport de suppression des modes latéraux en 8.8;
- utilisation d'un appareil optique de mesure de longueur d'onde étalonné pour des mesurages précis de longueur d'onde des lasers unimodaux longitudinaux.

General Information

• Status: Published
• Publication Date: 04-Jul-2021
• ICS: 33.180.01 - Fibre optic systems in general
• Technical Committee: SC 86C - Fibre optic systems, sensing and active devices
• Drafting Committee: WG 1 - TC 86/SC 86C/WG 1
• Current Stage: PPUB - Publication issued
• Start Date: 29-Jul-2021
• Completion Date: 05-Jul-2021

Relations

• Revises: IEC 61280-1-3:2010 - Fibre optic communication subsystem test procedures - Part 1-3: General communication subsystems - Central wavelength and spectral width measurement
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61280-1-3 ®
Edition 3.0 2021-07
INTERNATIONAL
STANDARD
colour
inside
Fibre optic communication subsystem test procedures –
Part 1-3: General communication subsystems – Measurement of central
wavelength, spectral width and additional spectral characteristics
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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About the IEC
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International Standards for all electrical, electronic and related technologies.

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IEC 61280-1-3 ®
Edition 3.0 2021-07
INTERNATIONAL
STANDARD
colour
inside
Fibre optic communication subsystem test procedures –

Part 1-3: General communication subsystems – Measurement of central

wavelength, spectral width and additional spectral characteristics

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.01 ISBN 978-2-8322-9954-8

– 2 – IEC 61280-1-3:2021 © IEC 2021
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviated terms . 6
3.1 Wavelength . 6
3.2 Spectral width . 7
3.3 Additional spectral characteristics . 7
3.4 Abbreviated terms . 8
4 Apparatus . 8
4.1 Calibrated optical spectrum analyzer (OSA) . 8
4.2 Calibrated optical wavelength meter (OWM) . 8
4.3 Power supplies . 9
4.4 Input signal source or modulator . 9
4.5 Test cord . 9
5 Test sample . 9
6 Procedure (method A) . 9
6.1 General . 9
6.2 Setup . 10
6.3 Adjustment of spectrum analyzer controls . 10
6.4 Setting of optical wavelength meter. 11
7 Procedure (method B) . 11
7.1 Setup . 11
7.2 Adjustment of spectrum analyzer controls . 11
7.3 Setting of optical wavelength meter. 11
7.4 Continuous LED and SLM spectra . 12
7.5 Discrete MLM spectra . 12
7.6 SLM spectra. 12
8 Calculation . 13
8.1 General . 13
8.2 Centre wavelength . 13
8.2.1 Continuous LED spectra . 13
8.2.2 Discrete MLM spectra . 13
8.3 Centroidal wavelength . 13
8.4 Peak wavelength . 14
8.4.1 Continuous LED and SLM spectra . 14
8.4.2 Discrete MLM spectra . 14
8.5 RMS spectral width (Δλ ) . 14
rms
8.6 n-dB-down spectral width (Δλ ) . 14
n-dB
8.7 Full-width at half-maximum spectral width (Δλ ) . 14
fwhm
8.7.1 Continuous LED spectra . 14
8.7.2 Discrete MLM spectra . 15
8.8 Side-mode suppression ratio (SMSR) . 15
8.9 Signal-to-source spontaneous emission ratio (SSER) . 15
9 Test results . 15
9.1 Required information . 15

9.2 Information to be available on request . 16
10 Examples of results . 16
Bibliography . 21

Figure 1 – Example of a LED optical spectrum . 16
Figure 2 – Typical spectrum analyzer output for MLM laser . 18
Figure 3 – Δλ spectral width measurement for MLM laser. 18
fwhm
Figure 4 – Δλ spectral width calculation for MLM laser . 19
fwhm
Figure 5 – Peak emission wavelength and Δλ measurement for SLM laser . 19
30-dB
Figure 6 – Resolution bandwidth (RBW) dependence of SMSR for SLM laser . 20
Figure 7 – Signal-to-source spontaneous emission ratio measurement for SLM laser . 20

Table 1 – Measurement points for LED spectrum from Figure 1 . 17
Table 2 – RMS spectral characterization . 17

– 4 – IEC 61280-1-3:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC COMMUNICATION SUBSYSTEM TEST PROCEDURES –

Part 1-3: General communication subsystems – Measurement of central
wavelength, spectral width and additional spectral characteristics

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 61280-1-3 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 third edition cancels and replaces the second edition published in 2010. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of measurement of signal-to-source spontaneous emission ratio in 8.9;
b) change of document title to reflect the additional measurement;
c) additional information on the resolution bandwidth used in the measurement of the side-
mode suppression ratio in 8.8;
d) use of a calibrated optical wavelength meter for accurate wavelength measurements of
single-longitudinal mode lasers.

The text of this International Sta
...

IEC 61280-1-3 ®
Edition 3.0 2021-07
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Fibre optic communication subsystem test procedures –
Part 1-3: General communication subsystems – Central wavelength and spectral
width measurement Measurement of central wavelength, spectral width and
additional spectral characteristics

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

IEC Central Office Tel.: [phone]
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CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

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once a month by email.
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(IEV) online.
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If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer Service
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IEC 61280-1-3 ®
Edition 3.0 2021-07
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Fibre optic communication subsystem test procedures –
Part 1-3: General communication subsystems – Central wavelength and spectral
width measurement Measurement of central wavelength, spectral width and
additional spectral characteristics
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.01 ISBN 978-2-8322-4937-6
– 2 – IEC 61280-1-3:2021 RLV © IEC 2021
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviated terms . 6
3.1 Wavelength . 6
3.2 Spectral width . 7
3.3 Additional spectral characteristics . 7
3.4 Abbreviated terms . 8
4 Apparatus . 8
4.1 Calibrated optical spectrum analyzer (OSA) . 8
4.2 Calibrated optical wavelength meter (OWM) . 8
4.3 Power supplies . 9
4.4 Input signal source or modulator . 9
4.5 Test cord . 9
5 Test sample . 9
6 Procedure (method A) . 9
6.1 General . 9
6.2 Setup . 10
6.3 Adjustment of spectrum analyzer controls . 10
6.4 Setting of optical wavelength meter. 11
7 Procedure (method B) . 11
7.1 Setup . 11
7.2 Adjustment of spectrum analyzer controls . 11
7.3 Setting of optical wavelength meter. 12
7.4 Continuous LED and SLM spectra . 12
7.5 Discrete MLM spectra . 12
7.6 Continuous SLM spectra . 13
8 Calculation . 13
8.1 General . 13
8.2 Centre wavelength . 13
8.2.1 Continuous LED spectra . 13
8.2.2 Discrete MLM spectra . 13
8.3 Centroidal wavelength . 13
8.4 Peak wavelength . 14
8.4.1 Continuous LED and SLM spectra . 14
8.4.2 Discrete MLM spectra . 14
8.5 RMS spectral width (Δλ ) . 14
rms
8.6 n-dB-down spectral width (Δλ ) . 14
n-dB
8.7 Full-width at half-maximum spectral width (Δλ ) . 15
fwhm
8.7.1 Continuous LED spectra . 15
8.7.2 Discrete MLM spectra . 15
8.8 Side-mode suppression ratio (SMSR) . 15
8.9 Signal-to-source spontaneous emission ratio (SSER) . 15
9 Test results . 15
9.1 Required information . 15

9.2 Information to be available on request . 16
10 Examples of results . 16
Bibliography . 21

Figure 1 – Example of a LED optical spectrum . 16
Figure 2 – Typical spectrum analyzer output for MLM laser . 18
Figure 3 – Δλ spectral width measurement for MLM laser. 18
fwhm
Figure 4 – Δλ spectral width calculation for MLM laser . 19
fwhm
Figure 5 – Peak emission wavelength and Δλ measurement for SLM laser . 19
30-dB
Figure 6 – Resolution bandwidth (RBW) dependence of SMSR for SLM laser . 20
Figure 7 – Signal-to-source spontaneous emission ratio measurement for SLM laser . 20

Table 1 – Measurement points for LED spectrum from Figure 1 . 17
Table 2 – RMS spectral characterization . 17

– 4 – IEC 61280-1-3:2021 RLV © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC COMMUNICATION SUBSYSTEM TEST PROCEDURES –

Part 1-3: General communication subsystems – Central wavelength and
spectral width measurement Measurement of central wavelength, spectral
width and additional spectral characteristics

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.
This redline version of the official IEC Standard allows the user to identify the changes made to
the previous edition IEC 61280-1-3:2010. 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 61280-1-3 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 third edition cancels and replaces the second edition published in 2010. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of measurement of signal-to-source spontaneous emission ratio in 8.9;
b) change of doc
...

IEC 61280-1-3 ®
Edition 3.0 2021-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic communication subsystem test procedures –
Part 1-3: General communication subsystems – Measurement of central
wavelength, spectral width and additional spectral characteristics

Procédures d'essai des sous-systèmes de télécommunication fibroniques –
Partie 1-3: Sous-systèmes généraux de télécommunication – Mesure de la
longueur d'onde centrale, de la largeur spectrale et des caractéristiques
spectrales supplémentaires
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

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IEC 61280-1-3 ®
Edition 3.0 2021-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic communication subsystem test procedures –

Part 1-3: General communication subsystems – Measurement of central

wavelength, spectral width and additional spectral characteristics

Procédures d'essai des sous-systèmes de télécommunication fibroniques –

Partie 1-3: Sous-systèmes généraux de télécommunication – Mesure de la

longueur d'onde centrale, de la largeur spectrale et des caractéristiques

spectrales supplémentaires
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.01 ISBN 978-2-8322-1051-9

– 2 – IEC 61280-1-3:2021 © IEC 2021
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviated terms . 6
3.1 Wavelength . 6
3.2 Spectral width . 7
3.3 Additional spectral characteristics . 7
3.4 Abbreviated terms . 8
4 Apparatus . 8
4.1 Calibrated optical spectrum analyzer (OSA) . 8
4.2 Calibrated optical wavelength meter (OWM) . 8
4.3 Power supplies . 9
4.4 Input signal source or modulator . 9
4.5 Test cord . 9
5 Test sample . 9
6 Procedure (method A) . 9
6.1 General . 9
6.2 Setup . 10
6.3 Adjustment of spectrum analyzer controls . 10
6.4 Setting of optical wavelength meter. 11
7 Procedure (method B) . 11
7.1 Setup . 11
7.2 Adjustment of spectrum analyzer controls . 11
7.3 Setting of optical wavelength meter. 11
7.4 Continuous LED and SLM spectra . 12
7.5 Discrete MLM spectra . 12
7.6 SLM spectra. 12
8 Calculation . 13
8.1 General . 13
8.2 Centre wavelength . 13
8.2.1 Continuous LED spectra . 13
8.2.2 Discrete MLM spectra . 13
8.3 Centroidal wavelength . 13
8.4 Peak wavelength . 14
8.4.1 Continuous LED and SLM spectra . 14
8.4.2 Discrete MLM spectra . 14
8.5 RMS spectral width (Δλ ) . 14
rms
8.6 n-dB-down spectral width (Δλ ) . 14
n-dB
8.7 Full-width at half-maximum spectral width (Δλ ) . 14
fwhm
8.7.1 Continuous LED spectra . 14
8.7.2 Discrete MLM spectra . 15
8.8 Side-mode suppression ratio (SMSR) . 15
8.9 Signal-to-source spontaneous emission ratio (SSER) . 15
9 Test results . 15
9.1 Required information . 15

9.2 Information to be available on request . 16
10 Examples of results . 16
Bibliography . 21

Figure 1 – Example of a LED optical spectrum . 16
Figure 2 – Typical spectrum analyzer output for MLM laser . 18
Figure 3 – Δλ spectral width measurement for MLM laser. 18
fwhm
Figure 4 – Δλ spectral width calculation for MLM laser . 19
fwhm
Figure 5 – Peak emission wavelength and Δλ measurement for SLM laser . 19
30-dB
Figure 6 – Resolution bandwidth (RBW) dependence of SMSR for SLM laser . 20
Figure 7 – Signal-to-source spontaneous emission ratio measurement for SLM laser . 20

Table 1 – Measurement points for LED spectrum from Figure 1 . 17
Table 2 – RMS spectral characterization . 17

– 4 – IEC 61280-1-3:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
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FIBRE OPTIC COMMUNICATION SUBSYSTEM TEST PROCEDURES –

Part 1-3: General communication subsystems – Measurement of central
wavelength, spectral width and additional spectral characteristics

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,
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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 techni
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