Fibre optic communication subsystem test procedures - Part 1-4: General communication subsystems - Light source encircled flux measurement method

IEC 61280-1-4:2023 is available as IEC 61280-1-4:2023 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 61280-1-4:2023 establishes the characterization process of the encircled flux measurement method of light sources intended to be used with multimode fibre. This document sets forth a procedure for the collection of two-dimensional fibre optic nearfield greyscale data and subsequent reduction to one-dimensional data expressed as a set of three sampled parametric functions of radius from the fibre’s optical centre. Estimation of the fibre core diameter is not an objective of this document. This third edition cancels and replaces the second edition published in 2009. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- improvement of calibration procedure and calibration traceability;
- improvement of fibre shaker description and requirements;
- addition of pulsed light sources;
- removal of a poorly traceable calibration process using a micro positioner.

Procédures d’essai des sous-systèmes de télécommunication fibroniques - Partie 1-4: Sous-systèmes généraux de télécommunication - Méthode de mesure du flux inscrit de la source optique

IEC 61280-1-4:2023 est disponible sous forme de IEC 61280-1-4:2023 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 61280-1-4:2023 stipule le processus de caractérisation de la méthode de mesure du flux inscrit de sources optiques destinées à être utilisées avec des fibres multimodales. Le présent document définit une procédure consistant à collecter des données fibroniques de champ proche, bidimensionnelles et en niveaux de gris, puis à les réduire en données unidimensionnelles exprimées sous la forme d’un ensemble de trois fonctions paramétriques échantillonnées du rayon par rapport au centre optique de la fibre. Cette troisième édition annule et remplace la deuxième édition parue en 2009. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:
- amélioration de la procédure et de la traçabilité de l’étalonnage;
- amélioration de la description et des exigences relatives à l’agitateur de fibre;
- ajout des sources optiques pulsées;
- suppression d’un processus d’étalonnage utilisant un micropositionneur, en raison de sa faible traçabilité.

General Information

Status
Published
Publication Date
18-Jan-2023
Current Stage
PPUB - Publication issued
Start Date
17-Feb-2023
Completion Date
19-Jan-2023
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IEC 61280-1-4:2023 RLV - Fibre optic communication subsystem test procedures - Part 1-4: General communication subsystems - Light source encircled flux measurement method Released:1/19/2023 Isbn:9782832263990
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IEC 61280-1-4:2023 - Fibre optic communication subsystem test procedures - Part 1-4: General communication subsystems - Light source encircled flux measurement method Released:1/19/2023
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IEC 61280-1-4 ®
Edition 3.0 2023-01
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Fibre optic communication subsystem test procedures –
Part 1-4: General communication subsystems – Light source encircled flux
measurement method
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 Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
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.

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The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
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Centre: sales@iec.ch.
IEC 61280-1-4 ®
Edition 3.0 2023-01
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Fibre optic communication subsystem test procedures –
Part 1-4: General communication subsystems – Light source encircled flux
measurement method
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.01 ISBN 978-2-8322-6399-0

– 2 – IEC 61280-1-4:2023 RLV © IEC 2023
CONTENTS
FOREWORD . 4
INTRODUCTION . 2
0.1 General .
0.2 Changes from previous edition .
0.3 Assumptions applicable to the characterization of data sources .
0.4 Assumptions applicable to the characterization of measurement sources .
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Symbols . 9
5 Assumptions . 10
5.1 Assumptions applicable to the characterization of data sources . 10
5.2 Assumptions applicable to the characterization of measurement sources . 10
6 Apparatus . 10
6.1 Common apparatus . 10
6.1.1 General . 10
6.1.2 Computer. 11
6.1.3 Image digitizer . 11
6.1.4 Detector . 11
6.1.5 Magnifying optics . 12
6.1.6 Attenuation Attenuator . 12
6.1.7 Micro positioner (optional) . 13
6.1.8 Input port . 13
6.1.9 Calibration light source . 13
6.2 Transmission source apparatus . 13
6.2.1 General . 13
6.2.2 Test jumper assembly . 14
6.2.3 Fibre shaker . 14
6.3 Measurement source apparatus . 15
7 Sampling and specimens . 15
8 Geometric calibration . 16
9 Measurement procedure . 16
9.1 Safety . 16
9.2 Image acquisition . 16
9.2.1 Raw image acquisition . 16
9.2.2 Dark image acquisition . 17
9.2.3 Corrected image . 17
9.3 Optical centre determination . 17
9.3.1 General . 17
9.3.2 Centroid image . 17
9.3.3 Centroid computation . 18
9.4 Test source image acquisition . 18
10 Computation of encircled flux . 19
10.1 Computation of radial data functions . 19
10.2 Integration limit and baseline determination . 21
10.2.1 Integration limit . 21

10.2.2 Baseline determination . 21
10.2.3 Baseline subtraction . 21
10.3 Computation of encircled flux . 21
11 Results . 22
11.1 Information available with each measurement . 22
11.2 Information available upon request . 22
12 Specification information . 22
Annex A (informative) Measurement sensitivity considerations . 24
A.1 Baseline averaging considerations . 24
A.2 Pixel sensitivity variation calibration . 26
A.3 Correlated double sampling . 26
A.4 Imperfections of practical detectors and optics . 27
Annex B (informative) Theory of geometric calibration using the micropositioner .
Annex C (normative) Procedure for geometric calibration using the micropositioner .
Bibliography . 37

Figure 1 – Apparatus block diagram . 11
Figure 2 – Typical set-up for transmission source measurement . 14
Figure 3 – Fibre shaker example . 15
Figure 4 – Pixel and ring illustration . 19
Figure A.1 – Core images from instrument A and instrument B . 24
Figure A.2 – Compressed core images from instrument A and instrument B . 25
Figure A.3 – Intensity versus radius for instruments A and B. 25

– 4 – IEC 61280-1-4:2023 RLV © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC COMMUNICATION SUBSYSTEM
TEST PROCEDURES –
Part 1-4: General communication subsystems –
Light source encircled flux measurement method

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,
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...


IEC 61280-1-4 ®
Edition 3.0 2023-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic communication subsystem test procedures –
Part 1-4: General communication subsystems – Light source encircled flux
measurement method
Procédures d’essai des sous-systèmes de télécommunication fibroniques –
Partie 1-4: Sous-systèmes généraux de télécommunication – Méthode de
mesure du flux inscrit de la source optique

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
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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.

IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always have
committee, …). It also gives information on projects, replaced access to up to date content tailored to your needs.
and withdrawn publications.
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The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and once
and French, with equivalent terms in 19 additional languages.
a month by email.
Also known as the International Electrotechnical Vocabulary

(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 61280-1-4 ®
Edition 3.0 2023-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic communication subsystem test procedures –

Part 1-4: General communication subsystems – Light source encircled flux

measurement method
Procédures d’essai des sous-systèmes de télécommunication fibroniques –

Partie 1-4: Sous-systèmes généraux de télécommunication – Méthode de

mesure du flux inscrit de la source optique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.01 ISBN 978-2-8322-6361-7

– 2 – IEC 61280-1-4:2023 © IEC 2023
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Symbols . 8
5 Assumptions . 10
5.1 Assumptions applicable to the characterization of data sources . 10
5.2 Assumptions applicable to the characterization of measurement sources . 10
6 Apparatus . 10
6.1 Common apparatus . 10
6.1.1 General . 10
6.1.2 Computer. 10
6.1.3 Image digitizer . 11
6.1.4 Detector . 11
6.1.5 Magnifying optics . 11
6.1.6 Attenuator . 12
6.1.7 Micro positioner (optional) . 12
6.1.8 Input port . 12
6.1.9 Calibration light source . 12
6.2 Transmission source apparatus . 13
6.2.1 General . 13
6.2.2 Test jumper assembly . 13
6.2.3 Fibre shaker . 13
6.3 Measurement source apparatus . 15
7 Sampling and specimens . 15
8 Geometric calibration . 15
9 Measurement procedure . 15
9.1 Safety . 15
9.2 Image acquisition . 15
9.2.1 Raw image acquisition . 15
9.2.2 Dark image acquisition . 16
9.2.3 Corrected image . 16
9.3 Optical centre determination . 16
9.3.1 General . 16
9.3.2 Centroid image . 17
9.3.3 Centroid computation . 17
9.4 Test source image acquisition . 18
10 Computation of encircled flux . 18
10.1 Computation of radial data functions . 18
10.2 Integration limit and baseline determination . 20
10.2.1 Integration limit . 20
10.2.2 Baseline determination . 20
10.2.3 Baseline subtraction . 20
10.3 Computation of encircled flux . 21
11 Results . 21

11.1 Information available with each measurement . 21
11.2 Information available upon request . 21
12 Specification information . 22
Annex A (informative) Measurement sensitivity considerations . 23
A.1 Baseline averaging considerations . 23
A.2 Pixel sensitivity variation calibration . 25
A.3 Correlated double sampling . 25
A.4 Imperfections of practical detectors and optics . 26
Bibliography . 28

Figure 1 – Apparatus block diagram . 10
Figure 2 – Typical set-up for transmission source measurement . 13
Figure 3 – Fibre shaker example . 14
Figure 4 – Pixel and ring illustration . 18
Figure A.1 – Core images from instrument A and instrument B . 23
Figure A.2 – Compressed core images from instrument A and instrument B . 24
Figure A.3 – Intensity versus radius for instruments A and B. 24

– 4 – IEC 61280-1-4:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC COMMUNICATION SUBSYSTEM
TEST PROCEDURES –
Part 1-4: General communication subsystems –
Light source encircled flux measurement method

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 Committ
...

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