EN IEC 62343-5-2:2018

SLOVENSKI STANDARD
01-maj-2018
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Dynamic modules - Part 5-2: Test methods - 1xN fixed-grid WSS - Dynamic crosstalk
measurement (IEC 62343-5-2:2018)
Ta slovenski standard je istoveten z: EN IEC 62343-5-2:2018
ICS:
33.180.01 6LVWHPL]RSWLþQLPLYODNQLQD Fibre optic systems in
VSORãQR general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 62343-5-2

NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2018
ICS 33.180.01, 33.180.99
English Version
Dynamic modules - Part 5-2: Test methods - 1xN fixed-grid WSS
- Dynamic crosstalk measurement
(IEC 62343-5-2:2018)
Modules dynamiques - Partie 5-2: Méthodes d'essai - Dynamische Module - Teil 5-2: Prüfverfahren - 1×N-
Commutateurs sélectifs en longueur d'onde à grille fixe 1 x Festraster-WSS - Messung des dynamischen
N - Mesure de diaphonie dynamique Übersprechens
(IEC 62343-5-2:2018) (IEC 62343-5-2:2018)
This European Standard was approved by CENELEC on 2018-02-19. 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
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62343-5-2:2018 E

European foreword
The text of document 86C/1449/CDV, future edition 1 of IEC 62343-5-2, prepared by IEC/SC 86C
"Fibre optic systems and active devices" of IEC/TC 86 "Fibre optics" was submitted to the IEC-
CENELEC parallel vote and approved by CENELEC as EN IEC 62343-5-2:2018.

The following dates are fixed:
• latest date by which the document has to be (dop) 2018-11-19
implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2021-02-19
• latest date by which the national
standards conflicting with the
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 62343-5-2:2018 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 61300-3-50 NOTE Harmonized as EN 61300-3-50.
IEC 62343-3-3:2014 NOTE Harmonized as EN 62343-3-3:2014 (not modified).

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 61300-3-29 -  Fibre optic interconnecting devices and EN 61300-3-29 -
passive components - Basic test and
measurement procedures -- Part 3-29:
Examinations and measurements -
Spectral transfer characteristics of DWDM
devices
IEC 62343 -  Dynamic modules - General and guidance EN 62343 -
IEC/TR 61931 -  Fibre optic - Terminology - -
IEC/TS 62538 -  Categorization of optical devices - -
ISO/IEC Guide 99 -  International vocabulary of metrology - - -
Basic and general concepts and
associated terms (VIM)
IEC 62343-5-2 ®
Edition 1.0 2018-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Dynamic modules –
Part 5-2: Test methods – 1 x N fixed-grid WSS – Dynamic crosstalk measurement

Modules dynamiques –
Partie 5-2: Méthodes d'essai – Commutateurs sélectifs en longueur d'onde à grille

fixe 1 x N – Mesure de diaphonie dynamique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.01 33.180.99 ISBN 978-2-8322-5267-3

– 2 – IEC 62343-5-2:2018 © IEC 2018
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviated terms . 6
3.1 Basic terms . 6
3.2 Performance parameter terms . 8
3.3 Abbreviated terms . 9
4 Apparatus . 10
4.1 Test set-up . 10
4.2 Light source . 10
4.2.1 Tuneable laser source (TLS) . 10
4.2.2 Broadband light source and tuneable filter . 11
4.3 Device under test . 11
4.4 Detector . 12
4.4.1 Optical power meter (OPM) . 12
4.4.2 OE converter and oscilloscope . 12
5 Measurement condition . 13
5.1 General conditions . 13
5.2 Recommendations on selections of a branching port and channel . 13
6 Procedure . 13
6.1 Preparation . 13
6.2 Measurement . 14
6.2.1 Measurement of input power and insertion loss of DUT . 14
6.2.2 Measurement of noise power for dynamic crosstalk . 14
6.2.3 Measurement of noise power for different channel crosstalk . 14
6.2.4 Measurement of noise power for same channel crosstalk . 14
7 Example of transient characteristics of noise power . 15
8 Calculation . 17
9 Measurement report . 19
Bibliography . 21

Figure 1 – Noise observed in port during conducting port switching in 1 x N WSS . 9
Figure 2 – Test set-up to measure dynamic crosstalk . 10
Figure 3 – Transient characteristics for measurement of different channel dynamic
crosstalk . 16
Figure 4 – Transient characteristics for measurement of same channel dynamic
crosstalk . 17

Table 1 – Example of template for measurement results for different channel dynamic
crosstalk . 19
Table 2 – Example of summary of crosstalk measurement . 20

IEC 62343-5-2:2018 © IEC 2018 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DYNAMIC MODULES –
Part 5-2: Test methods – 1 x N fixed-grid WSS –
Dynamic crosstalk measurement
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 62343-5-2 has been prepared by subcommittee 86C: Fibre optic
systems and active devices, of IEC technical committee 86: Fibre optics.
The text of this International Standard is based on the following documents:
CDV Report on voting
86C/1449/CDV 86C/1480/RVC
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.
A list of all parts in the IEC 62343 series, published under the general title Dynamic modules,
can be found on the IEC website.

– 4 – IEC 62343-5-2:2018 © IEC 2018
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.
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.
IEC 62343-5-2:2018 © IEC 2018 – 5 –
INTRODUCTION
Dynamic crosstalk is attributed to both channel crosstalk (due to same wavelength and/or
other wavelengths) and port isolation. It is predicted to change during port switching
operations and is a significant performance issue studied and summarized in
IEC TR 62343-6-9 for 1 x N (N ≥ 3) wavelength selective switches (WSSs).
It was revealed that dynamic crosstalk exists in actual 1 x N (N ≥ 3) WSSs in
IEC TR 62343-6-9 and predicted that it would influence transmission properties to some
extent when a specific channel passes through the WSS.
This document standardizes the measurement method of dynamic crosstalk of 1 x N (N ≥ 3)
WSSs.
This document is based on OITDA DM 01 from the Optoelectronic Industry and Technology
Development Association (OITDA).

– 6 – IEC 62343-5-2:2018 © IEC 2018
DYNAMIC MODULES –
Part 5-2: Test methods – 1 x N fixed-grid WSS –
Dynamic crosstalk measurement
1 Scope
This part of IEC 62343 describes the measurement methods of dynamic crosstalk during port
switching for 1 x N fixed-grid wavelength selective switches (WSSs).
The objective of this document is to establish a standard test method for different-channel
dynamic crosstalk and same-channel dynamic crosstalk that occur when a particular optical
channel signal is switched to the specific branching port against a common port in
ITU-T 50 GHz and 100 GHz fixed grid 1 x N (N ≥ 3) WSSs.
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 61300-3-29, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 3-29: Examinations and measurements – Spectral
transfer characteristics of DWDM devices
IEC TR 61931, Fibre optic – Terminology
IEC 62343, Dynamic modules – General and guidance
IEC TS 62538, Categorization of optical devices
ISO/IEC Guide 99, International vocabulary of metrology – Basic and general concepts and
associated terms (VIM)
3 Terms, definitions and abbreviated terms
For the purposes of this document, the terms and definitions given in IEC TR 61931,
IEC 62343, IEC TS 62538, ISO/IEC Guide 99, and the following apply.
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
3.1 Basic terms
3.1.1
fixed grid
grid where the frequency of channel spacings of WSSs having a port configuration of 1 x N
(N ≥ 2) is predetermined for all channels and not variable

IEC 62343-5-2:2018 © IEC 2018 – 7 –
3.1.2
port pair
combination of one input port and one arbitrary output port among N ports, as for a WSS
having a port configuration of 1 x N (N ≥ 2)
Note 1 to entry: It is also valid when the WSS is used as an N x 1 port configuration. In this case, the port pair is
defined as a combination of one arbitrary input port among N ports and one output port, as for the WSS having a
port configuration of N x 1 (N ≥ 2).
3.1.3
conducting port pair
two ports, i and j, between which transfer coefficient, t , which is defined in IEC TS 62627-09,
ij
is nominally greater than zero
Note 1 to entry: The conducting port pair is defined at a specific switching state and a specified wavelength.
3.1.4
isolated port pair
two ports, i and j, between which transfer coefficient, t , which is defined in IEC TS 62627-09,
ij
is nominally zero, and logarithmic transfer coefficient, a , which is defined in IEC TS 62627-09,
ij
is nominally infinite
Note 1 to entry: The isolated port pair is defined at a specific switching state and a specified wavelength.
3.1.5
attenuating port pair
two ports, i and j, between which transfer coefficient, t , which is defined in IEC TS 62627-09,
ij
is nominally greater than zero and smaller than the insertion loss
Note 1 to entry: The attenuating port pair is defined at a specific switching state and a specified wavelength.
3.1.6
conducting channel
channel intended to be conducted at the specific conducting port pair
3.1.7
isolated channel
channel intended to be isolated at the specific conducting port pair
3.1.8
common port
port for the "1" side, not for the "N" side, with a WSS having a port configuration of 1 x N
(N ≥ 2)
3.1.9
branching port
port for the "N" side, not for the "1" side, with a WSS having a port configuration of 1 x N
(N ≥ 2)
3.1.10
static state
state when the conducting port pair, isolated port pair and attenuating port pair are not under
switching and/or attenuating operation, and the optical power is kept within 10 % in linear
scale at any intended conduction port pair
3.1.11
dynamic state
state when at least one conducting port pair, isolated port pair or attenuating port pair is
under switching and/or attenuating operation, and the optical power varies more than 10 % in
linear scale at a specific intended conduction port pair in this state

– 8 – IEC 62343-5-2:2018 © IEC 2018
3.2 Performance parameter terms
3.2.1
crosstalk
ratio of the transfer coefficient of the power to be isolated to the transfer coefficient for the
power to be conducted for an output port
Note 1 to entry: Crosstalk is generally a negative value expressed in dB.
Note 2 to entry: For fibre optic filters and WDM devices, crosstalk is defined for one port pair at two or more
different wavelengths (channels).
Note 3 to entry: For fibre optic switches, crosstalk is defined for two or more port pairs at one wavelength.
Note 4 to entry: Crosstalk for a passive optical device (component) is generally the maximum value of crosstalks
for all port pairs defining crosstalks.
Note 5 to entry: For WSSs, crosstalk is defined for two or more port pairs at two or more different wavelengths
(channels).
[SOURCE: IEC TS 62627-09:2016, 3.4.10, modified — Note 5 has been added.]
3.2.2
static crosstalk
crosstalk in a static state for a 1 x N (N ≥ 2) WSS, specified by the unintended signal
transmission ratio divided by the intended signal transmission ratio
Note 1 to entry: Static crosstalk is generally a negative value expressed in dB.
Note 2 to entry: Two types of static crosstalk are defined: different channel static crosstalk and same channel
static crosstalk.
3.2.3
different channel static crosstalk
static crosstalk, specified by the ratio of the isolated channel power divided by the conducting
channel power in the same conducting port pair, when the input channel power in the isolated
channel and conducting channel is the same
Note 1 to entry: Different channel static crosstalk is generally a negative value expressed in dB.
3.2.4
same channel static crosstalk
static crosstalk, specified by the ratio of the channel power in the isolated port pair divided by
the channel power in the conducting port pair, when the input channel power in the isolated
port pair and the conducting port pair are the same
Note 1 to entry: Same channel static crosstalk is generally a negative value expressed in dB.
3.2.5
dynamic crosstalk
transient crosstalk
crosstalk attributed to both channel crosstalk (due to the same wavelength and/or other
wavelengths) and port isolation, predicted to change during the switching operation in the
WSS module
Note 1 to entry: Dynamic crosstalk is generally a negative value expressed in dB.
Note 2 to entry: Two types of dynamic crosstalk are defined: different channel dynamic crosstalk and same
channel dynamic crosstalk.
Note 3 to entry: Dynamic crosstalk is applied to 1 x N (N ≥ 3) WSSs.
[SOURCE: IEC 62343-3-3:2014, 3.15, modified — The term "dynamic crosstalk" has been
added as a first preferred term, and the note to entry has been replaced by three new notes.]

IEC 62343-5-2:2018 © IEC 2018 – 9 –
3.2.6
different channel dynamic crosstalk
optical power ratio of the isolated channel power divided by the conducting channel power in
the selected output port, when the input power of the conducting channel and the isolated
channel are the same
Note 1 to entry: Different channel dynamic crosstalk is generally a negative value expressed in dB.
Note 2 to entry: Signal leakage of the blue isolated channel in port 2 is the noise component for the red
conducting channel signal in port 2 for the demultiplexing WSSs shown in Figure 1 a).
Note 3 to entry: Different channel dynamic crosstalk is applied to 1 x N (N ≥ 3) WSSs.
3.2.7
same channel dynamic crosstalk
optical power ratio of the isolated channel power in the isolated port pair divided by the
conducting channel power in the conducting port pair, when the channel power in the input
port of the conducting port pair and the channel power in the input port of the isolated port
pair are the same
Note 1 to entry: Same channel dynamic crosstalk is applied to 1 x N (N ≥ 3) WSSs.
Note 2 to entry: Same channel dynamic crosstalk is generally a negative value expressed in dB.
Note 3 to entry: Red coloured signals in ports 1 and N are the noise components for the red signal in port 2, when
the conducting port pair for the blue signal is switched from port 1 to N in the multiplexing WSS shown in
Figure 1 b). All red signals in the isolated port pairs will be noise components. However, same channel dynamic
crosstalk is defined by the ratio of the optical loss between the conducting port pair and an isolated port pair.

Port 1
Port 1
Port 2
Port 2
Common
Port N
Common
port
port Port N
IEC
IEC
Noise observed in port during switching operation
a) Demultiplexing WSS b) Multiplexing WSS
Figure 1 – Noise observed in port during conducting port switching in 1 x N WSS
3.3 Abbreviated terms
ASE amplified spontaneous emission
DLP digital light processor
ITU-T International Telecommunication Union, Telecommunication Standardization Sector
LC liquid crystal
LCOS liquid crystal on silicon
LED light emitting diode
MEMS micro-electro-mechanical system
OE optical-to-electrical
OPM optical power meter
RBD reference branching device
TJ temporary joint
TLS tuneable laser source
WSS wavelength selective switch

– 10 – IEC 62343-5-2:2018 © IEC 2018
4 Apparatus
4.1 Test set-up
The test set-up consists of a light source, i.e. tuneable laser source (TLS) or broadband light
source, detector, i.e. optical power meter (OPM) or OE converter, and other equipment. An
example of the measurement set-up for measurement of the noise power to obtain the
dynamic crosstalk is given in Figure 2. The light of wavelength λ is input into the common port
of the WSS as a device under test (DUT) using TLS. Optical power, which is output from all
branching ports 1 to N, is measured simultaneously and continuously with a multi-port OPM
connected to each branching port. All apparatus are connected by the temporary joint (TJ). If
necessary, the wavelength meter with a reference branching device (RBD) may be used.
Power variation during switching of the the conducting port of the WSS is measured with the
OPM and recorded.
Figure 1 shows noise power that influences the different channel dynamic crosstalk is
generated in the case where the WSS is used as a demultiplexer, and noise power that
influences the same channel crosstalk is generated in the case where the WSS is used as a
multiplexer. However, optical noise power to measure both dynamic crosstalks is measured
with the test set-up shown in Figure 2, because the WSS is bidirectional.
In this test set-up, not only optical noise power in dynamic state but al
...