SIST EN 60793-1-48:2018

Optical fibres - Part 1-48: Measurement methods and test procedures - Polarization mode dispersion (IEC 60793-1-48:2017)

Applies to three methods of measuring polarization mode dispersion (PMD).  Establishes uniform requirements for measuring the PMD of single-mode optical fibre, thereby assisting in the inspection of fibres and cables for commercial purposes. In this edition, reference to IEC 61282-9 has resulted in the removal of Annexes E, F, G and H as well as the creation of a new Annex E.

Lichtwellenleiter - Teil 1-48: Messmethoden und Prüfverfahren - Polarisationsmodendispersion (IEC 60793-1-48:2017)

Fibres optiques - Partie 1-48: Méthodes de mesure et procédures d'essai - Dispersion du mode de polarisation (IEC 60793-1-48:2017)

S'appliques aux trois méthodes de mesure de la dispersion de mode de polarisation (Polarization Mode Dispersion, PMD). Elle établit des exigences uniformes pour mesurer la PMD d'une fibre optique unimodale, de façon à aider dans l'examen des fibres et des câbles à des fins commerciales. Dans cette édition, la référence à la CEI 61289-2 a entraîné le retrait des Annexes E, F, G et H ainsi que la création d'une nouvelle Annexe E.

Optična vlakna - 1-48. del: Metode merjenja in preskusni postopki - Disperzija z načinom polarizacije (IEC 60793-1-48:2017)

Uporablja se za tri merilne metode polarizacijske razpršitve (PMD).  Določa enotne zahteve za merjenje polarizacijske razpršitve enorodnih optičnih vlaken, pri čemer pomaga pri pregledu vlaken in kablov za komercialne namene. V tej izdaji je bil dodan sklic na standard IEC 61282-9, zato so bili odstranjeni dodatki E, F, G in H ter je bil oblikovan nov dodatek E.

General Information

• Status: Published
• Publication Date: 19-Dec-2017
• ICS: 33.180.10 - Fibres and cables
• Technical Committee: MOC - Mobile Communications
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 13-Dec-2017
• Due Date: 17-Feb-2018
• Completion Date: 20-Dec-2017
• Ref Project: EN 60793-1-48:2017 - Optical fibres - Part 1-48: Measurement methods and test procedures - Polarization mode Dispersion

Relations

• Replaces: SIST EN 60793-1-48:2008 - Optical fibres -- Part 1-48: Measurement methods and test procedures - Polarization mode dispersion
• Effective Date: 12-Dec-2017
• Replaces: SIST EN 60793-1-48:2008 - Optical fibres -- Part 1-48: Measurement methods and test procedures - Polarization mode dispersion
• Effective Date: 07-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 60793-1-48:2018
01-februar-2018
1DGRPHãþD
SIST EN 60793-1-48:2008
2SWLþQDYODNQDGHO0HWRGHPHUMHQMDLQSUHVNXVQLSRVWRSNL'LVSHU]LMD]
QDþLQRPSRODUL]DFLMH,(&
Optical fibres - Part 1-48: Measurement methods and test procedures - Polarization
mode dispersion (IEC 60793-1-48:2017)
Lichtwellenleiter - Teil 1-48: Messmethoden und Prüfverfahren -
Polarisationsmodendispersion (IEC 60793-1-48:2017)
Fibres optiques - Partie 1-48: Méthodes de mesure et procédures d'essai - Dispersion du
mode de polarisation (IEC 60793-1-48:2017)
Ta slovenski standard je istoveten z: EN 60793-1-48:2017
ICS:
33.180.10 2SWLþQDYODNQDLQNDEOL Fibres and cables
SIST EN 60793-1-48:2018 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 60793-1-48:2018

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SIST EN 60793-1-48:2018


EUROPEAN STANDARD EN 60793-1-48

NORME EUROPÉENNE

EUROPÄISCHE NORM
December 2017
ICS 33.180.10 Supersedes EN 60793-1-48:2007
English Version
Optical fibres - Part 1-48: Measurement methods and test
procedures - Polarization mode Dispersion
(IEC 60793-1-48:2017)
Fibres optiques - Partie 1-48: Méthodes de mesure et Lichtwellenleiter - Teil 1-48: Messmethoden und
procédures d'essai - Dispersion de mode de polarisation Prüfverfahren - Polarisationsmodendispersion
(IEC 60793-1-48:2017) (IEC 60793-1-48:2017)
This European Standard was approved by CENELEC on 2017-09-27. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, 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
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN 60793-1-48:2017 E

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SIST EN 60793-1-48:2018
EN 60793-1-48:2017
European foreword
The text of document 86A/1678/CDV, future edition 3 of IEC 60793-1-48 , prepared by SC 86A "Fibres
and cables" of IEC/TC 86 "Fibre optics" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN 60793-1-48:2017.

The following dates are fixed:

• latest date by which the document has to be (dop) 2018-06-27
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2020-09-27
standards conflicting with the
document have to be withdrawn

This document supersedes EN 60793-1-48:2007.

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 60793-1-48:2017 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 60793-1-44 NOTE Harmonized as EN 60793-1-44.
IEC 60793-1-50 NOTE Harmonized as EN 60793-1-50.
IEC 60793-2-50 NOTE Harmonized as EN 60793-2-50.
IEC 60794-3 NOTE Harmonized as EN 60794-3.
IEC 61280-4-4 NOTE Harmonized as EN 61280-4-4.
IEC 61290-11-1 NOTE Harmonized as EN 61290-11-1.
IEC 61290-11-2 NOTE Harmonized as EN 61290-11-2.
IEC 61300-3-32 NOTE Harmonized as EN 61300-3-32.
2

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SIST EN 60793-1-48:2018
EN 60793-1-48:2017
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year

IEC 60793-1-1 -  Optical fibres - EN 60793-1-1 -
Part 1-1: Measurement methods and test
procedures - General and guidance
IEC/TR 61292-5 -  Optical amplifiers - - -
Part 5: Polarization mode dispersion
parameter - General information
ITU-T -  Definitions and test methods for statistical - -
Recommendation and non-linear related attributes of single-
G.650.2 mode fibre and cable

3

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SIST EN 60793-1-48:2018

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SIST EN 60793-1-48:2018




IEC 60793-1-48

®


Edition 3.0 2017-08




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE
colour

inside










Optical fibres –

Part 1-48: Measurement methods and test procedures – Polarization mode

dispersion




Fibres optiques –

Partie 1-48: Méthodes de mesure et procédures d’essai – Dispersion de mode


de polarisation













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 33.180.10 ISBN 978-2-8322-4686-3



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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SIST EN 60793-1-48:2018
– 2 – IEC 60793-1-48:2017 © IEC 2017

CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms, definitions, symbols and abbreviated terms . 8
3.1 Terms and definitions . 8
3.2 Symbols and abbreviated terms . 8
4 General . 10
4.1 Methods for measuring PMD . 10
4.2 Reference test method . 13
4.3 Applicability . 13
5 Apparatus . 14
5.1 General . 14
5.2 Light source and polarizers . 14
5.3 Input optics . 14
5.4 Input positioner . 14
5.5 Cladding mode stripper . 14
5.6 High-order mode filter . 15
5.7 Output positioner . 15
5.8 Output optics . 15
5.9 Detector . 15
5.10 Computer . 15
6 Sampling and specimens . 15
6.1 General . 15
6.2 Specimen length . 16
6.3 Deployment. 16
6.3.1 General . 16
6.3.2 Uncabled fibre . 16
6.3.3 Optical fibre cable . 16
7 Procedure . 17
8 Calculation or interpretation of results . 17
9 Documentation . 17
9.1 Information required for each measurement . 17
9.2 Information to be available . 17
10 Specification information . 18
Annex A (normative) Requirements specific to method A (FA) – Fixed analyser
measurement method . 19
A.1 Apparatus . 19
A.1.1 Block diagrams . 19
A.1.2 Light source . 19
A.1.3 Analyser . 20
A.2 Procedure . 20
A.2.1 Wavelength range and increment . 20
A.2.2 Complete the scans . 20

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SIST EN 60793-1-48:2018
IEC 60793-1-48:2017 © IEC 2017 – 3 –
A.3 Calculations . 23
A.3.1 Approaches of calculating PMD . 23
A.3.2 Extrema counting . 23
A.3.3 Fourier transform . 23
A.3.4 Cosine Fourier analysis . 25
Annex B (normative) Requirements specific to method B (SPE) – Stokes parameter
evaluation method . 30
B.1 Apparatus . 30
B.1.1 Block diagram . 30
B.1.2 Light source . 30
B.1.3 Polarimeter . 31
B.2 Procedure . 31
B.3 Calculations . 32
B.3.1 Principle . 32
B.3.2 Jones matrix eigenanalysis (JME) . 33
B.3.3 Poincaré sphere analysis (PSA) . 34
B.3.4 State of polarization (SOP) . 35
Annex C (normative) Requirements specific to method C (INTY) – Interferometry
method . 36
C.1 Apparatus . 36
C.1.1 Block diagram . 36
C.1.2 Light source . 39
C.1.3 Beam splitter . 39
C.1.4 Analyser . 39
C.1.5 Interferometer . 39
C.1.6 Polarization scrambler . 39
C.1.7 Polarization beam splitter . 40
C.2 Procedure . 40
C.2.1 Calibration . 40
C.2.2 Routine operation . 40
C.3 Calculations . 44
C.3.1 General . 44
C.3.2 TINTY calculations . 44
C.3.3 GINTY calculations . 45
Annex D (informative) Determination of RMS width from a fringe envelope . 47
D.1 Overview. 47
D.2 RMS calculation for TINTY . 47
D.3 RMS calculation for GINTY . 49
Bibliography . 51

Figure A.1 – Block diagrams for method A . 19
Figure A.2 – Typical results from method A . 22
Figure A.3 – PMD by Fourier analysis . 25
Figure A.4 – Cross-correlation and autocorrelation functions . 29
Figure B.1 – Block diagram for method B . 30
Figure B.2 – Typical random mode coupling results from method B. 32
Figure B.3 – Typical histogram of DGD values. . 33
Figure C.1 – Schematic diagram for method C (generic implementation) . 36

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SIST EN 60793-1-48:2018
– 4 – IEC 60793-1-48:2017 © IEC 2017
Figure C.2 – Other schematic diagrams for method C . 38
Figure C.3 – Fringe envelopes for negligible and random polarization mode coupling of
TINTY-based measurement system . 41
Figure C.4 – Fringe envelopes for mixed, negligible and random polarization mode
coupling of GINTY-based measurement system . 43
Figure D.1 – Parameters for interferogram analysis . 47

Table A.1 – Cosine transform calculations . 28

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SIST EN 60793-1-48:2018
IEC 60793-1-48:2017 © IEC 2017 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

OPTICAL FIBRES –

Part 1-48: Measurement methods and test procedures –
Polarization mode dispersion

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 60793-1-48 has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee 86: Fibre optics.
This third edition cancels and replaces the second edition published in 2007. It constitutes a
technical revision. This edition includes the following significant technical change with respect
to the previous edition:
a) removal of the SOP approach.

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SIST EN 60793-1-48:2018
– 6 – IEC 60793-1-48:2017 © IEC 2017
The text of this standard is based on the following documents:
CDV Report on voting
86A/1678/CDV 86A/1766/RVC

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
This International Standard is to be read in conjunction with IEC 60793-1-1:2008. A list of all
parts in the IEC 60793 series, published under the general title Optical fibres, can be found on
the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability 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.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.

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SIST EN 60793-1-48:2018
IEC 60793-1-48:2017 © IEC 2017 – 7 –
INTRODUCTION
Polarization mode dispersion (PMD) causes an optical pulse to spread in the time domain.
This dispersion could impair the performance of a telecommunications system. The effect can
be related to differential phase and group velocities and corresponding arrival times δτ of
different polarization components of the signal. For a sufficiently narrow band source, the
effect can be related to a differential group delay (DGD), ∆τ, between pairs of orthogonally
polarized principal states of polarization (PSP) at a given wavelength. For broadband
transmission, the delays bifurcate and result in an output pulse that is spread out in the time
domain. In this case, the spreading can be related to the average of DGD values.
In long fibre spans, DGD is random in both time and wavelength since it depends on the
details of the birefringence along the entire fibre length. It is also sensitive to time-dependent
temperature and mechanical perturbations on the fibre. For this reason, a useful way to
characterize PMD in long fibres is in terms of an average DGD value over an appropriately
large optical frequency range, either RMS <∆τ>, the rms DGD over this frequency range, or
MEAN <∆τ>, the (linear) mean of the DGD over this same frequency range. In principle, the
average DGD value (RMS <∆τ> or MEAN <∆τ>) does not undergo large changes for a given
fibre from day to day or from source to source, unlike the parameters δτ or ∆τ. In addition, the
average DGD value is a useful predictor of lightwave system performance.
The term "PMD" is used both in the general sense of two polarization modes having different
group velocities, and in the specific sense of the average DGD value (RMS <∆τ> or MEAN
<∆τ>). Although the DGD ∆τ or pulse broadening ∆δ is preferably averaged over frequency,
for certain situations it may be averaged over time, or temperature.
The coupling length l is the length of fibre or cable at which appreciable coupling between
c
the two polarization states begins to occur. If the fibre length L satisfies the condition L << l ,
c
mode coupling is negligible, and <∆τ> scales with fibre length. The corresponding PMD
coefficient is
short-length PMD coefficient = <∆τ>/L.
Fibres in practical systems nearly always have fibre lengths much greater than the coupling
length and random mode coupling. When mode coupling is random, <∆τ> scales with the
square root of fibre length, and
long-length PMD coefficient = <∆τ>/ L .

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SIST EN 60793-1-48:2018
– 8 – IEC 60793-1-48:2017 © IEC 2017
OPTICAL FIBRES –

Part 1-48: Measurement methods and test procedures –
Polarization mode dispersion



1 Scope
This part of IEC 60793 applies to three methods of measuring polarization mode dispersion
(PMD), which are described in Clause 4. It establishes uniform requirements for measuring
the PMD of single-mode optical fibre, thereby assisting in the inspection of fibres and cables
for commercial purposes.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements 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 60793-1-1, Optical fibres - Part 1-1: Measurement methods and test procedures - General
and guidance
IEC TR 61292-5, Optical amplifiers - Part 5: Polarization mode dispersion parameter -
General information
ITU-T Recommendation G.650.2, Definitions and test methods for statistical and non-linear
related attributes of single-mode fibre and cable
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ITU-T Recommendation
G.650.2 apply.
NOTE Further explanation of their use in this document is provided in IEC TR 61282-9.
ISO and IEC maintain terminological databases for use 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
3.2 Symbols and abbreviated terms

Arg Argument function
ASE Amplified spontaneous emission
BBS Broadband source
CFT Cosine Fourier transform
c/c Velocity of light in vacuum/in free space
0
DGD Differential group delay
DGD Maximum DGD value
max

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SIST EN 60793-1-48:2018
IEC 60793-1-48:2017 © IEC 2017 – 9 –
DOP Degree of polarization
E Number of extrema in R(λ) (method A)
EC Extrema counting
f(∆τ) Maxwell probability distribution
FA Fixed analyser (method A)
FCFT Fast cosine Fourier transform
FT Fourier transform
FUT Fibre under test
GINTY General analysis for method C
INTY Interferometry method (method C)
I/O Input/output
JME Jones matrix eigenanalysis (method B)
k Mode coupling factor
l Coupling length
c
L Length of fibre/fibre cable test sample
LED Light emitting diode
N Total number of measurements/population of mode-coupled
fibres/wavelength intervals
P (λ) Optical power recorded with analyser in place (method A)
A
P Probability of exceeding DGD
F max
o
P (λ) Optical power recorded with analyser rotated 90 (method A)
B
P (λ) Optical power recorded with analyser removed (method
...