EN 61280-2-12:2014

SLOVENSKI STANDARD
01-september-2014
3RVWRSNLSUHVNXãDQMDRSWLþQHJDNRPXQLNDFLMVNHJDSRGVLVWHPDGHO
'LJLWDOQLVLVWHPL0HUMHQMHRþHVQLKGLDJUDPRYLQ4IDNWRUMDVWHKQLNR
SURJUDPVNHJDSURåHQMD]DRFHQMHYDQMHNDNRYRVWLSUHQRVQLKVLJQDORY,(&

Fibre optic communication subsystem test procedures - Part 2-12: Digital systems -
Measuring eye diagrams and Q-factor using a software triggering technique for
transmission signal quality assessment
Ta slovenski standard je istoveten z: EN 61280-2-12:2014
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 61280-2-12

NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2014
ICS 33.180.10
English Version
Fibre optic communication subsystem test procedures - Part 2-
12: Digital systems - Measuring eye diagrams and Q-factor using
a software triggering technique for transmission signal quality
assessment
(IEC 61280-2-12:2014)
Procédures d'essai des sous-systèmes de Prüfverfahren für Lichtwellenleiter-Kommunikationssysteme
télécommunication à fibres optiques - Partie 2-12: - Teil 2-12: Digitale Systeme - Messungen von
Systèmes numériques - Mesure des diagrammes de l'oeil et Augendiagrammen und des Q-Faktors mit einem Software-
du facteur de qualité à l'aide d'une technique par Triggerverfahren für die Qualitätsbewertung von
déclenchement logiciel pour l'évaluation de la qualité de la Übertragungssignalen
transmission de signaux (IEC 61280-2-12:2014)
(CEI 61280-2-12:2014)
This European Standard was approved by CENELEC on 2014-06-10. 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, 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: Avenue Marnix 17, B-1000 Brussels
© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 61280-2-12:2014 E
Foreword
The text of document 86C/1150/CDV, future edition 1 of IEC 61280-2-12, prepared by 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 61280-2-12:2014.

The following dates are fixed:
(dop) 2015-03-10
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2017-06-10
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 [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 61280-2-12:2014 was approved by CENELEC as a
European Standard without any modification.

- 3 - EN 61280-2-12:2014
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.

NOTE 1 When 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 61280-2-2 - Fibre optic communication subsystem test EN 61280-2-2 -
procedures -
Part 2-2: Digital systems - Optical eye
pattern, waveform and extinction ratio
measurement
ITU-T 2012 Optical transport network physical layer - -
Recommendation interfaces
G.959.1
IEC 61280-2-12 ®
Edition 1.0 2014-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic communication subsystem test procedures –

Part 2-12: Digital systems – Measuring eye diagrams and Q-factor using a

software triggering technique for transmission signal quality assessment

Procédures d'essai des sous-systèmes de télécommunication à fibres

optiques –
Partie 2-12: Systèmes numériques – Mesure des diagrammes de l'œil et du

facteur de qualité à l'aide d'une technique par déclenchement logiciel pour

l'évaluation de la qualité de la transmission de signaux

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX R
ICS 33.180.10 ISBN 978-2-8322-1545-6

– 2 – IEC 61280-2-12:2014 © IEC 2014
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Abbreviated terms . 6
4 Software synchronization method and Q-factor . 6
4.1 Example of asynchronous waveform and eye diagram reconstructed by
software triggering technique . 6
4.2 Q-factor formula . 7
5 Apparatus . 9
5.1 General . 9
5.2 Optical bandpass filter . 10
5.3 High frequency receiver . 10
5.4 Clock oscillator . 11
5.5 Electric pulse generator . 11
5.6 Sampling module . 11
5.7 Electric signal processing circuit . 12
5.8 Optical clock pulse generator . 12
5.9 Optical sampling module . 12
5.10 Optical signal processing circuit . 12
5.11 Synchronization bandwidth . 12
5.12 Monitoring system parameters . 13
6 Procedure . 13
6.1 General . 13
6.2 Measuring eye diagrams and Q calculations . 13
Annex A (informative) Example of the signal processing required to reconstruct the
synchronous eye diagram . 15
Annex B (informative) Adequate sampling time width (gate width) . 17
Bibliography . 18

Figure 1 – Asynchronous waveform and synchronous eye diagram of 40 Gbps RZ-
signal reconstructed by software triggering technique . 7
Figure 2 – RZ synchronous eye diagram reconstructed by software triggering
technique, time window, and histogram . 8
Figure 3 – Example of relationship between Q-factor and window width . 8
Figure 4 – Test system 1 for measuring eye diagrams and Q-factor using the software
triggering technique . 9
Figure 5 – Test system 2 for measuring eye diagrams and Q-factor using the software
triggering technique . 10
Figure A.1 – Block diagram of the software triggering module . 15
Figure A.2 – Example of interpolating a discrete spectrum and determining beat
frequency . 16
Figure B.1 – The typical calculated relationship between the adequate sampling time
width (gate width) and the bit rate of the optical signal . 17

Table 1 – Monitoring system parameters . 13

IEC 61280-2-12:2014 © IEC 2014 – 3 –

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC COMMUNICATION SUBSYSTEM TEST PROCEDURES –

Part 2-12: Digital systems –
Measuring eye diagrams and Q-factor using a software triggering
technique for transmission signal quality assessment

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 ed
...