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SIST EN 61300-3-43:2009
01-julij-2009
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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)
Lichtwellenleiter - Verbindungselemente und passive Bauteile - Grundlegende Prüf- und
Messverfahren - Teil 3-43: Untersuchungen und Messungen - Messung der Moden-
Transferfunktion bei Lichtwellenleiterquellen (IEC 61300-3-43:2009)
Dispositifs d'interconnexion et composants passifs à fibres optiques - Méthodes
fondamentales d'essais et de mesures - Partie 3-43: Examens et mesures - Mesures de
la fonction de transfert de modes pour les sources à fibres optiques (CEI 61300-3-
43:2009)
Ta slovenski standard je istoveten z: EN 61300-3-43:2009
ICS:
33.180.20 3RYH]RYDOQHQDSUDYH]D Fibre optic interconnecting
RSWLþQDYODNQD devices
SIST EN 61300-3-43:2009 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 61300-3-43:2009
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SIST EN 61300-3-43:2009
EUROPEAN STANDARD
EN 61300-3-43
NORME EUROPÉENNE
April 2009
EUROPÄISCHE NORM
ICS 33.180.20
English version
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)
Dispositifs d'interconnexion Lichtwellenleiter -
et composants passifs à fibres optiques - Verbindungselemente
Méthodes fondamentales d'essais und passive Bauteile -
et de mesures - Grundlegende Prüf- und Messverfahren -
Partie 3-43: Examens et mesures - Teil 3-43: Untersuchungen
Mesures de la fonction de transfert und Messungen -
de modes pour les sources Messung der Moden-Transferfunktion
à fibres optiques bei Lichtwellenleiterquellen
(CEI 61300-3-43:2009) (IEC 61300-3-43:2009)
This European Standard was approved by CENELEC on 2009-04-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: avenue Marnix 17, B - 1000 Brussels
© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61300-3-43:2009 E
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SIST EN 61300-3-43:2009
EN 61300-3-43:2009 - 2 -
Foreword
The text of document 86B/2780/FDIS, future edition 1 of IEC 61300-3-43, prepared by SC 86B, Fibre
optic interconnecting devices and passive components, of IEC TC 86, Fibre optics, was submitted to the
IEC-CENELEC parallel vote and was approved by CENELEC as EN 61300-3-43 on 2009-04-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2010-01-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2012-04-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61300-3-43:2009 was approved by CENELEC as a European
Standard without any modification.
__________
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SIST EN 61300-3-43:2009
- 3 - EN 61300-3-43:2009
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
1) 2)
IEC 60793-1-20 - Optical fibres - EN 60793-1-20 2002
Part 1-20: Measurement methods and test
procedures - Fibre geometry
1) 2)
IEC 61300-1 - Fibre optic interconnecting devices and EN 61300-1 2003
passive components - Basic test and
measurement procedures -
Part 1: General and guidance
1) 2)
IEC 61300-3-4 - Fibre optic interconnecting devices and EN 61300-3-4 2001
passive components - Basic test and
measurement procedures -
Part 3-4: Examinations and measurements -
Attenuation
1)
Undated reference.
2)
Valid edition at date of issue.
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SIST EN 61300-3-43:2009
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SIST EN 61300-3-43:2009
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 2-8318-1024-2
Registered trademark of the International Electrotechnical Commission
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SIST EN 61300-3-43:2009
– 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
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SIST EN 61300-3-43:2009
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.
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SIST EN 61300-3-43:2009
– 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.
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SIST EN 61300-3-43:2009
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
1
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)
⎜ ⎟ ⎜ ⎟
1
a a
⎢ ⎝ ⎠ ⎥ ⎝ ⎠
⎣ ⎦
where
a is the fibre core radius;
α is the profile factor (α = 2 for a parabolic profile);
___________
1
Figures in square brackets refer to the Bibliography.
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SIST EN 61300-3-43:2009
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Δ is the relative index difference, given by
2 2
n − n
1 2
Δ = (2)
2
2n
1
where
n is the index at fibre centre;
1
n is the cladding index.
2
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+α )
2α 2
δ
m ⎡ ⎤ ⎡ r⎤
= = (5)
⎢ ⎥ ⎢ ⎥
M Δ a
⎣ ⎦ ⎣ ⎦
The term (m/M) is usually referred to as the relative mode number, or the normalised mode
number.
The maximum principle mode number M, is given by
α n 2πa
⎛ ⎞
1
M = Δ (6)
⎜ ⎟
α + 2 λ
⎝ ⎠
A typical normalised MTF plot is shown in Figure 1, where it can be seen, in this example,
that normalised mode numbers up to about 0,6 are equally filled and higher order modes are
progressively less well-filled.
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SIST EN 61300-3-43:2009
61300-3-43 © IEC:2009(E) – 7 –
1,0
0,75
0,50
0,25
0,0
0,0 0,2 0,4 0,6 0,8 1,0
Normalised mode number
IEC 2371/08
Figure 1 – Example of normalised MTF
4.1 Alternative method
If the profile factor, α, in Equation (4) is not known, then an alternative expression for MTF
can be used.
It is known[3] that in a fully-filled fibre (i.e. MTF=1 for all mode numbers) the near-field
intensity profile, I , is approximately the same shape as the square of the refractive index
o
2 α-1
profile, n(r) . Furthermore, the term r Equation (4) is equal (ignoring constants) to the
2
differential of n(r) and so Equation(4) can be rewritten as:
⎡ dI( r ) 1 ⎤
MTF(δ ) = × (7)
⎢ ⎥
2
dr dI ( r ) dr
o r
⎣ ⎦
δ =Δ()
a
where a value of α=2 has been assumed in order to compute values for the normalised mode
number.
Thus the MTF is equal to the ratio
...