IEC 61300-3-43:2009

Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-43: Examinations and measurements - Mode transfer function measurement for fibre optic sources

IEC 61300-3-43:2009 describes the method for measuring the mode transfer function (MTF) to be used in characterising the launch conditions for measurements of attenuation and or return loss of multimode passive components. The MTF may be measured at the operational wavelengths. This standard cancels and replaces IEC/PAS 61300-3-43, published in 2006. This first edition constitutes a technical revision.

Dispositifs d'interconnexion et composants passifs fibroniques - Procédures fondamentales d'essais et de mesures - Partie 3-43: Examens et mesures - Mesures de la fonction de transfert modal pour sources fibroniques

IEC 61300-3-43: 2009 décrit la méthode de mesure de la fonction de transfert modal (MTF, Mode Transfer Function) à utiliser lors de la caractérisation des conditions d’injection pour les mesures de l’affaiblissement et/ou de l’affaiblissement de réflexion des composants passifs multimodaux. La MTF peut être mesurée au niveau des longueurs d’onde opérationnelles. La présente norme annule et remplace l’IEC/PAS 61300-3-43, publiée en 2006. Cette première édition constitue une révision technique.

General Information

• Status: Published
• Publication Date: 21-Jan-2009
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 33.180.20 - Fibre optic interconnecting devices
• Technical Committee: SC 86B - Fibre optic interconnecting devices and passive components
• Drafting Committee: WG 4 - TC 86/SC 86B/WG 4
• Current Stage: PPUB - Publication issued
• Start Date: 31-Jan-2009
• Completion Date: 22-Jan-2009

Relations

• Replaces: IEC PAS 61300-3-43:2006 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-43: Examinations and measurements - Mode transfer function measurement for fibre optic sources
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61300-3-43 ®
Edition 1.0 2009-01
INTERNATIONAL
STANDARD
Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures –
Part 3-43: Examinations and measurements – Mode transfer function
measurement for fibre optic sources

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.

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IEC 61300-3-43 ®
Edition 1.0 2009-01
INTERNATIONAL
STANDARD
Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures –
Part 3-43: Examinations and measurements – Mode transfer function
measurement for fibre optic sources

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
R
ICS 33.180.20 ISBN 978-2-88910-501-4
– 2 – 61300-3-43 © IEC:2009(E)
CONTENTS
FOREWORD.3
1 Scope.5
2 Normative references .5
3 General description .5
4 Theory.5
4.1 Alternative method .7
4.2 Mode power distribution .7
4.3 Constraints.8
5 Apparatus.9
5.1 General .9
5.2 Test sample .9
5.3 Sample positioning device.9
5.4 Optical system.10
5.5 Camera .10
5.6 Video digitiser .10
5.7 Calibration.10
6 Procedure .11
6.1 Mounting and aligning the sample .11
6.2 Optimisation .11
6.3 Acquiring the data .11
7 Calculations .11
7.1 Background level subtraction.11
7.2 Location of centroid of intensity profile .12
7.3 Differentiating the intensity profile .12
7.4 Computing the MTF.13
8 Results .14
Annex A (informative) .16
Bibliography.18

Figure 1 – Example of normalised MTF.7
Figure 2 – Example of normalised MPD .8
Figure 3 – Schematic of measurement apparatus.9
Figure 4 – Location of fibre centre using symmetry computation .13
Figure A.1 – Sensitivity of MTF and MPD to core diameter.16
Figure A.2 – Sensitivity of MTF and MPD to profile factor .17

61300-3-43 © IEC:2009(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –

Part 3-43: Examinations and measurements –
Mode transfer function measurement for fibre optic sources

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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61300-3-43 has been prepared by subcommittee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
This standard cancels and replaces IEC/PAS 61300-3-43, published in 2006. This first edition
constitutes a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
86B/2780/FDIS 86B/2810/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.

– 4 – 61300-3-43 © IEC:2009(E)
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this standard may be issued at a later date.

61300-3-43 © IEC:2009(E) – 5 –
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –

Part 3-43: Examinations and measurements –
Mode transfer function measurement for fibre optic sources

1 Scope
This part of IEC 61300 describes the method for measuring the mode transfer function (MTF)
to be used in characterising the launch conditions for measurements of attenuation and or
return loss of multimode passive components. The MTF may be measured at the operational
wavelengths.
2 Normative references
The following referenced documents are indispensable for the application 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 61300-1, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 1: General and guidance
IEC 61300-3-4, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-4: Examination and measurements – Attenuation
IEC 60793-1-20, Optical fibres – Part 1-20: Measurement methods and test procedures –
Fibre geometry
3 General description
The modal distribution launched into multimode fibre can vary widely with different light
sources. This variation in launched modal distribution can result in significant differences in
measured attenuation in the same component. The MTF test method gives information about
the launched modal distribution (LMD) condition in a measured component. The MTF test
method is based on a measurement of the near-field intensity distribution in the fibre [1], [2] .
4 Theory
For a fibre with a power-law index profile n(r), given by,
0,5
α
⎡ ⎤
⎛ r⎞ ⎛ r⎞
n( r ) = n⎢1− 2Δ ⎥ ≤ 1 (1)
⎜ ⎟ ⎜ ⎟
a a
⎢ ⎝ ⎠ ⎥ ⎝ ⎠
⎣ ⎦
where
a is the fibre core radius;
α is the profile factor (α = 2 for a parabolic profile);
___________
Figures in square brackets refer to the Bibliography.

– 6 – 61300-3-43 © IEC:2009(E)
Δ is the relative index difference, given by
2 2
n − n
1 2
Δ = (2)
2n
where
n is the index at fibre centre;
n is the cladding index.
The near-field intensity profile in the fibre I(r) may be determined from an integration of the
mode transfer function MTF(δ) in the fibre, as follows (ignoring constants):
Δ
I( r ) = MTF(δ ) × dδ (3)
∫
α
r
Δ()
a
where
δ is the normalised propagation constant;
r/a is the normalised radial position.
Differentiating both sides gives the MTF as follows (ignoring constants):
⎡ ⎤
dI( r ) 1
MTF(δ ) = × (4)
⎢ ⎥
α −1 α
dr
⎣ r ⎦ r
δ =Δ()
a
The MTF is usually plotted as in terms of the principal mode number m divided by the
maximum principal mode number M, where
(2+α ) (2
...

IEC 61300-3-43 ®
Edition 1.0 2009-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures –
Part 3-43: Examinations and measurements – Mode transfer function
measurement for fibre optic sources

Dispositifs d’interconnexion et composants passifs fibroniques – Procédures
fondamentales d’essais et de mesures –
Partie 3-43: Examens et mesures – Mesure de la fonction de transfert modal
pour sources fibroniques
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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IEC 61300-3-43 ®
Edition 1.0 2009-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures –
Part 3-43: Examinations and measurements – Mode transfer function

measurement for fibre optic sources

Dispositifs d’interconnexion et composants passifs fibroniques – Procédures

fondamentales d’essais et de mesures –

Partie 3-43: Examens et mesures – Mesure de la fonction de transfert modal

pour sources fibroniques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.20 ISBN 978-2-8322-9359-1

– 2 – IEC 61300-3-43:2009  IEC 2009
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 General description . 5
4 Theory . 5
4.1 Alternative method . 7
4.2 Mode power distribution . 7
4.3 Constraints . 8
5 Apparatus . 9
5.1 General . 9
5.2 Test sample . 9
5.3 Sample positioning device . 9
5.4 Optical system. 10
5.5 Camera . 10
5.6 Video digitiser . 10
5.7 Calibration . 10
6 Procedure . 11
6.1 Mounting and aligning the sample . 11
6.2 Optimisation . 11
6.3 Acquiring the data . 11
7 Calculations . 11
7.1 Background level subtraction . 11
7.2 Location of centroid of intensity profile . 12
7.3 Differentiating the intensity profile . 12
7.4 Computing the MTF . 14
8 Results . 15
Annex A (informative) . 16
Bibliography . 18

Figure 1 – Example of normalised MTF . 7
Figure 2 – Example of normalised MPD . 8
Figure 3 – Schematic of measurement apparatus . 9
Figure 4 – Location of fibre centre using symmetry computation . 13
Figure A.1 – Sensitivity of MTF and MPD to core diameter. 16
Figure A.2 – Sensitivity of MTF and MPD to profile factor . 17

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –

Part 3-43: Examinations and measurements –
Mode transfer function measurement for fibre optic sources

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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61300-3-43 has been prepared by subcommittee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
This standard cancels and replaces IEC/PAS 61300-3-43, published in 2006. This first edition
constitutes a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
86B/2780/FDIS 86B/2810/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.

– 4 – IEC
...