Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-55: Examinations and measurements - Polarisation extinction ratio and keying accuracy of polarisation maintaining, passive, optical components (IEC 61300-3-55:2020)

This part of IEC 61300 provides methods for measuring the polarisation extinction ratio (PER)
of single-mode, polarisation maintaining (PM) optical components based upon PM fibres. This
document also provides methods for detecting the input and output orientation of the PM
components' principal axes as well as methods for estimating the keying accuracy, i.e. the
angular misalignment between the principal axes and the mechanical reference guide key of
the connectors, if these are present.

Lichtwellenleiter-Verbindungselemente und passive Bauteile - Grundlegende Prüf- und Messverfahren - Teil 3-55: Untersuchungen und Messungen - Polarisationsauslöschungsverhältnis und Tastgenauigkeit von polarisationserhaltenden, passiven, optischen Komponenten (IEC 61300-3-55:2020)

Dispositifs d’interconnexion et composants passifs fibroniques – Procédures fondamentales d’essais et de mesures - Partie 3-55: Examens et mesures - Rapport d’extinction de polarisation et précision du détrompage des composants optiques passifs maintenant la polarisation (IEC 61300-3-55:2020)

IEC 61300-3-55:2020 donne les méthodes pour mesurer le rapport d’extinction de polarisation (PER) des composants optiques unimodaux maintenant la polarisation (PM) basés sur des fibres PM. Le présent document donne également les méthodes pour détecter l’orientation, en entrée et en sortie, des axes principaux des composants PM, ainsi que les méthodes permettant d’estimer la précision du détrompage, c’est-à-dire l’erreur d’alignement angulaire entre les axes principaux et le détrompeur mécanique de référence, s’ils sont présents.

Optični spojni elementi in pasivne komponente - Postopki osnovnega preskušanja in meritev- 3-55. del: Preiskave in meritve - Stopnja slabljenja polarizacije in točnost ujemanja pasivnih optičnih komponent pri ohranjanju polarizacije (IEC 61300-3-55:2020)

General Information

Status
Published
Publication Date
08-Jul-2020
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Jul-2020
Due Date
05-Sep-2020
Completion Date
09-Jul-2020

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SLOVENSKI STANDARD
SIST EN IEC 61300-3-55:2020
01-september-2020
Optični spojni elementi in pasivne komponente - Postopki osnovnega preskušanja
in meritev- 3-55. del: Preiskave in meritve - Stopnja slabljenja polarizacije in
točnost ujemanja pasivnih optičnih komponent pri ohranjanju polarizacije (IEC
61300-3-55:2020)
Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures - Part 3-55: Examinations and measurements - Polarisation
extinction ratio and keying accuracy of polarisation maintaining, passive, optical
components (IEC 61300-3-55:2020)
Lichtwellenleiter-Verbindungselemente und passive Bauteile - Grundlegende Prüf- und
Messverfahren - Teil 3-55: Untersuchungen und Messungen -
Polarisationsauslöschungsverhältnis und Tastgenauigkeit von polarisationserhaltenden,
passiven, optischen Komponenten (IEC 61300-3-55:2020)
Dispositifs d’interconnexion et composants passifs fibroniques – Procédures
fondamentales d’essais et de mesures - Partie 3-55: Examens et mesures - Rapport
d’extinction de polarisation et précision du détrompage des composants optiques passifs
maintenant la polarisation (IEC 61300-3-55:2020)
Ta slovenski standard je istoveten z: EN IEC 61300-3-55:2020
ICS:
33.180.20 Povezovalne naprave za Fibre optic interconnecting
optična vlakna devices
SIST EN IEC 61300-3-55:2020 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 61300-3-55:2020

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SIST EN IEC 61300-3-55:2020


EUROPEAN STANDARD EN IEC 61300-3-55

NORME EUROPÉENNE

EUROPÄISCHE NORM
June 2020
ICS 33.180.20

English Version
Fibre optic interconnecting devices and passive components -
Basic test and measurement procedures - Part 3-
55:Examinations and measurements - Polarisation extinction
ratio and keying accuracy of polarisation maintaining, passive,
optical components
(IEC 61300-3-55:2020)
Dispositifs d'interconnexion et composants passifs
Lichtwellenleiter-Verbindungselemente und passive
fibroniques - Procédures fondamentales d'essais et de Bauteile - Grundlegende Prüf- und Messverfahren - Teil 3-
mesures - Partie 3-55: Examens et mesures - Rapport 55: Untersuchungen und Messungen -
d'extinction de polarisation et précision du détrompage des Polarisationsauslöschungsverhältnis und Tastgenauigkeit
composants optiques passifs maintenant la polarisation von polarisationserhaltenden, passiven, optischen
(IEC 61300-3-55:2020) Komponenten
(IEC 61300-3-55:2020)
This European Standard was approved by CENELEC on 2020-06-11. 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,
Turkey 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
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 61300-3-55:2020 E

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SIST EN IEC 61300-3-55:2020
EN IEC 61300-3-55:2020 (E)
European foreword
The text of document 86B/4276/FDIS, future edition 1 of IEC 61300-3-55, 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 approved by CENELEC as EN IEC 61300-3-55:2020.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-03-11
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-06-11
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.

Endorsement notice
The text of the International Standard IEC 61300-3-55:2020 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 60874-1 NOTE Harmonized as EN 60874-1
IEC 61300-3-24 NOTE Harmonized as EN 61300-3-24
IEC 61300-3-40 NOTE Harmonized as EN 61300-3-40


2

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SIST EN IEC 61300-3-55:2020



IEC 61300-3-55

®


Edition 1.0 2020-05




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures –

Part 3-55: Examinations and measurements – Polarisation extinction ratio and


keying accuracy of polarisation maintaining, passive, optical components



Dispositifs d’interconnexion et composants passifs fibroniques – Procédures


fondamentales d’essais et de mesures –

Partie 3-55: Examens et mesures – Rapport d’extinction de polarisation et

précision du détrompage des composants optiques passifs maintenant la

polarisation









INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 33.180.20 ISBN 978-2-8322-8255-7




Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 2 – IEC 61300-3-55:2020 © IEC 2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviated terms . 7
3.1 Terms and definitions . 7
3.2 Abbreviated terms . 7
4 General description . 8
5 Measurement principles . 8
6 Apparatuses . 9
6.1 General . 9
6.2 Method A (reference-less approach) . 9
6.2.1 General . 9
6.2.2 Light source . 10
6.2.3 Polariser and analyser . 11
6.2.4 Depolariser . 11
6.2.5 Input and output coupling optics . 11
6.2.6 Power detection system . 11
6.2.7 Mechanical holders . 12
6.2.8 Reference connector receptacle . 12
6.2.9 PM-DUT . 12
6.3 Method B (comparative approach) . 12
6.3.1 General . 12
6.3.2 Light source . 13
6.3.3 Polariser, waveplates and analyser . 13
6.3.4 Reference cable . 13
6.3.5 Coupling optics . 14
6.3.6 Power detection system . 14
6.3.7 Mechanical holders . 14
6.3.8 Reference connector receptacle . 14
6.3.9 PM-DUT . 14
7 PER measurement procedures . 14
7.1 General . 14
7.2 Method A (reference-less approach) . 15
7.2.1 General . 15
7.2.2 Measurement preparation . 15
7.2.3 Polarisation extinction ratio measurement . 15
7.3 Method B (comparative approach) . 16
7.3.1 General . 16
7.3.2 Measurement preparation . 16
7.3.3 Polarisation extinction ratio measurement . 18
8 Mechanical key accuracy measurement procedures . 18
8.1 General . 18
8.2 Method A (reference-less approach) . 18
8.2.1 General . 18
8.2.2 Measurement preparation . 19

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8.2.3 Mechanical reference guide key angular offset ∆ measurement . 19
8.3 Method B (comparative approach) . 19
8.3.1 General . 19
8.3.2 Measurement preparation . 20
8.3.3 Mechanical reference guide key angular offset ∆ measurement . 20
9 Details to be specified . 20
Annex A (informative) Generation of linear states of polarisation . 21
A.1 General . 21
A.2 Polariser – Quarter-waveplate – Polariser . 21
A.3 Polariser – Half-waveplate . 21
Annex B (informative) Keying accuracy for PM fibre . 23
Annex C (informative) Calculated extinction ratio versus measured values . 25
Bibliography . 27

Figure 1 – Test apparatus for both polarisation extinction ratio measurements and for
the determination of the mechanical reference guide keying angular misalignment . 10
Figure 2 – Test apparatus for both polarisation extinction ratio measurements and for
the determination of the mechanical reference guide key angular misalignment using a

reference . 13
Figure 3 – Typical power transmission curve after analyser . 16
Figure 4 – Schematic initial layout for measurement preparation according to method B . 17
Figure 5 – Examples of relative angular misalignments between fibre's principal axis,
mechanical reference guide key, reference receptacle, and analyser's orientation . 19
Figure A.1 – Arrangement 1 for the generation of a constant intensity, arbitrarily
oriented, linear SOP . 21
Figure A.2 – Arrangement 2 for the generation of a constant intensity, arbitrarily

oriented, linear SOP . 22
Figure B.1 – Relative position of mechanical reference guide key . 23
Figure B.2 – Relative position of mechanical reference guide key, geometrical and
optical axes in one example of PM PANDA fibre . 24
Figure B.3 – Relative position of mechanical reference guide key, geometrical and
optical axes in one example of Bowtie fibre . 24
Figure C.1 – Calculated extinction ratio versus measured values . 26
Figure C.2 – Calculated extinction ratio for a connection of two PM fibre sections . 26

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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –

Part 3-55: Examinations and measurements –
Polarisation extinction ratio and keying accuracy
of polarisation maintaining, passive, optical components

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.
International Standard IEC 61300-3-55 has been prepared by subcommittee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
The text of this International Standard is based on the following documents:
FDIS Report on voting
86B/4276/FDIS 86B/4290/RVD

Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

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SIST EN IEC 61300-3-55:2020
IEC 61300-3-55:2020 © IEC 2020 – 5 –
A list of all parts in the IEC 61300 series, published under the general title Fibre optic
interconnecting devices and passive components – Basic test and measurement 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 "http://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.

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INTRODUCTION
This document contains and expands the content of IEC 61300-3-24 and IEC 61300-3-40.

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IEC 61300-3-55:2020 © IEC 2020 – 7 –
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –

Part 3-55: Examinations and measurements –
Polarisation extinction ratio and keying accuracy
of polarisation maintaining, passive, optical components



1 Scope
This part of IEC 61300 provides methods for measuring the polarisation extinction ratio (PER)
of single-mode, polarisation maintaining (PM) optical components based upon PM fibres. This
document also provides methods for detecting the input and output orientation of the PM
components' principal axes as well as methods for estimating the keying accuracy, i.e. the
angular misalignment between the principal axes and the mechanical reference guide key of
the connectors, if these are present.
2 Normative references
There are no normative references in this document.
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
principal state of polarisation
PSP
state of polarisation (SOP) that propagates unaltered through an optically anisotropic medium
Note 1 to entry: It is also known as "eigen polarisation".
Note 2 to entry: This note applies to the French language only.
3.1.2
polarisation extinction ratio
PER
fraction of the power of one PSP that leaks onto the orthogonal one as it propagates along the
polarisation maintaining component
Note 1 to entry: This note applies to the French language only.
3.2 Abbreviated terms
Term Description
DUT device under test

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HWP half wave plate
PER polarisation extinction ratio
PM polarisation maintaining
PSP principal state of solarisation
QWP quarter wave plate
SLD super luminescent diode
SMF single-mode fibre
SOP state of polarisation

4 General description
A PM component is a physical system that can retain specific input SOP unaltered as light
propagates through it. In linearly birefringent systems, these SOPs correspond to two linear
polarisations, also referred to as PSPs, whose polarisation direction is parallel to the two PM-
element's principal axes.
While, in ideal PM components, the two principal states of polarisation (PSPs) propagate
uncoupled and unaltered, in reality they may exchange energy, effectively deviating from the
initial SOP. The origin of such deviations from the ideal behaviour may be:
• intrinsic and ascribable to imperfections in the optical guiding material structure, or
• extrinsic and related to external mechanical (stress), electrical, or thermal changes applied
to the PM component or a portion thereof.
How accurately a PM component can hold its PSPs is quantified by the PER. This document
defines measurement methods based upon the power coupling between the two nominal PSPs
in a linearly birefringent system when incoherent, linearly polarised light is injected into the PM
component under test (hereafter PM-DUT).
Where a PM component is a concatenation of several distinct PM sub-elements, the overall
system performance will be strongly influenced by how precisely the optical axes of the
individual sub-elements are aligned with each other at the interconnecting points. Since optical
fibre connectors are most often found at such junctions, it is of primary importance to evaluate
and assure that their reference keying mechanisms are properly aligned to the encapsulated
fibre's principal axes so that the PSPs may keep propagating unaltered. Methods for
determining such angular mismatch are also described. These rely upon the same set-ups used
by the methods proposed for the characterisation of the PER performance.
This document describes two methods for the measurement of PER performance and the keying
accuracy: a reference-less method (method A) and a comparative method (method B). Care
shall be taken when comparing the results obtained by the two methods because the measured
PER values refer to two distinct configurations. Additional information on keying accuracy for
PM fiber is found in Annex B.
5 Measurement principles
Both methods A and B rely upon the cross-polariser test procedure, which evaluates the PM
performance of a linearly birefringent PM-DUT by assessing the ratio between the power of the
linearly polarised components oriented along the two principal axes exiting the optical
component compared with the input power coupled into the PM-DUT.
A prerequisite to this measurement procedure is that the polarisation response of the
component to be tested is stationary, i.e. the polarisation performance is not actively influenced
or modified by external factors (electrical, mechanical, thermal, or other such as fibre and

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IEC 61300-3-55:2020 © IEC 2020 – 9 –
connectors manipulations) during the characterisation process. This requirement distinguishes
the cross-polariser procedure from an alternative measurement approach where the power
coupling between PSPs is assessed through a dynamic external intervention (mechanical or
thermal) and the detection of the evolution of the instantaneous output SOP. This latter
approach, also known as "in-line" method, is based upon fundamentally different experimental
conditions and, depending on the interpretation of the outcomes, it may lead to different or
inconsistent results when compared with those obtained using the cross-polariser procedure.
For a correct evaluation of the PM performance, the cross-polariser test procedure requires that
incoherent linearly polarized light, whose polarisation matches one of the input principal axes,
is coupled at the input end of the PM-DUT.
The polarisation performance of the PM-DUT is calculated from the transmitted powers carried
by the two linear polarisations oriented along the two principal axes of the component being
tested.
The orientation of the output optical axes of the PM-DUT is derived from the orientation of the
analyser once polariser and analyser are adjusted for absolute minimum power transmission.
6 Apparatuses
6.1 General
Although based upon the same physical principles, the experimental set-ups used for
methods A and B differ especially in the preparation of the input SOP to be injected into the
PM-DUT.
6.2 Method A (reference-less approach)
6.2.1 General
Method A is a reference-less, non-contact characterisation procedure that is not limited by
constraints imposed by the presence of reference cables, reference connectors, and their
wavelength dependence. This procedure is therefore generally well suited to PM-DUTs with
high PER values or for measurements that require a higher degree of accuracy. The
measurements are not influenced by the orientation accuracy between the fibre's optical axes
and the mechanical reference guide key of the PM-DUT's connectors. This is the preferred
measurement method for assessing PER.
The test apparatus for both polarisation extinction ratio measurements and for the determination
of the mechanical reference guide keying angular misalignment may schematically look like the
example shown in Figure 1.

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Key
1 input coupling optics
2 output coupling optics
3 incoherent light source
4 depolariser
5 linear polariser
6 PM-DUT
7 reference receptacle
8 linear analyser
9 power detector
Figure 1 – Test apparatus for both polarisation extinction ratio measurements and for
the determination of the mechanical reference guide keying angular misalignment
6.2.2 Light source
In order to remove any interference effect between the linear polarisation components oriented
along the two principal axes of the PM-DUT, the light source shall be sufficiently incoherent.
The coherence length l of the source shall satisfy the following constraint:
c
1 L
l < λ
c
 (1)
10 L
B
where
L is the PM-DUT's length;
L is the PSPs' beat length;
B
λ is the source's centre wavelength.
NOTE If L is not otherwise available, refer to IEC 60793-1-60.
B
In Formula (1), units shall be us
...

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