IEC 61280-2-13:2024

Fibre optic communication subsystem test procedures - Part 2-13: Digital systems - Measurement of error vector magnitude

IEC 61280-2-13:2024 series defines a procedure for calculating the root-mean-square error vector magnitude of optical n-APSK signals from a set of measured symbols. It specifically defines the normalization of the reference states and a procedure for optimal scaling of the measured symbol states. The procedure described in this document applies to single-polarized optical signals as well as to conventional polarization-multiplexed signals with independently modulated polarization tributaries. In general, it is not advisable to apply these procedures without modification to signals, in which optical amplitude, phase, and polarization state are simultaneously modulated to encode the information data. This document does not specify any signal processing steps for extracting the symbols from the received optical signals, because these steps depend on the optical receiver and can vary with the type of the transmitted n-APSK signal. These and optional additional signal processing steps are defined in application-specific documents.

Procédures d’essai des sous-systèmes de télécommunication fibroniques - Partie 2-13: Systèmes numériques - Mesure de l’amplitude du vecteur d’erreur

IEC 61280-2-13:2024 définit une procédure pour calculer la valeur efficace de l'amplitude du vecteur d'erreur des signaux MDAP-n optiques à partir d'un ensemble de symboles mesurés. Elle définit spécifiquement la normalisation des états de référence ainsi qu'une procédure de mise à l'échelle optimale des états de symboles mesurés. La procédure décrite dans le présent document s'applique aux signaux optiques à polarisation unique ainsi qu'aux signaux multiplexés en polarisation conventionnels avec des tributaires de polarisation modulés de façon indépendante. En général, il est déconseillé d'appliquer ces procédures sans modifier les signaux dans lesquels l'amplitude optique, la phase et l'état de polarisation sont simultanément modulés pour coder les données. Le présent document ne spécifie aucune étape de traitement du signal permettant d'extraire les symboles des signaux optiques reçus, car ces étapes dépendent du récepteur optique et peuvent varier selon le type du signal MDAP-n transmis. Ces étapes de traitement du signal ainsi des étapes supplémentaires facultatives sont définies dans les documents spécifiques à chaque application.

General Information

• Status: Published
• Publication Date: 16-Jul-2024
• ICS: 33.180.10 - Fibres and cables
• Technical Committee: SC 86C - Fibre optic systems and active devices
• Drafting Committee: WG 1 - TC 86/SC 86C/WG 1
• Current Stage: PPUB - Publication issued
• Start Date: 16-Aug-2024
• Completion Date: 17-Jul-2024

Standards Content (Sample)

IEC 61280-2-13 ®
Edition 1.0 2024-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic communication subsystem test procedures −
Part 2-13: Digital systems − Measurement of error vector magnitude

Procédures d’essai des sous-systèmes de télécommunication fibroniques –
Partie 2-13: Systèmes numériques – Mesure de l’amplitude du vecteur d’erreur
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IEC 61280-2-13 ®
Edition 1.0 2024-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic communication subsystem test procedures −

Part 2-13: Digital systems − Measurement of error vector magnitude

Procédures d’essai des sous-systèmes de télécommunication fibroniques –

Partie 2-13: Systèmes numériques – Mesure de l’amplitude du vecteur d’erreur

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.10  ISBN 978-2-8322-9403-1

– 2 – IEC 61280-2-13:2024 © IEC 2024
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Background and terminology . 8
4.1 General . 8
4.2 Vector modulated signals . 9
4.3 Constellation diagram . 10
4.4 Normalization of the reference constellation . 11
4.5 Scaling of the measured vectors . 12
4.6 Error vector magnitude of individual symbols . 12
4.7 Root-mean-square EVM . 13
4.8 Calculation of the scale factor . 14
4.9 Iterative calculation of the scale factor . 15
4.10 EVM for polarization multiplexed signals . 16
5 EVM measurement procedure . 16
5.1 Apparatus . 16
5.2 Preparation of data samples . 17
5.3 Calculation of the RMS EVM . 17
5.3.1 General . 17
5.3.2 Procedure with known reference states . 18
5.3.3 Procedure with unknown reference states . 18
5.4 Reporting . 19
Annex A (informative) Relationship between RMS EVM and Q-factor . 20
Bibliography . 25

Figure 1 – Constellation diagrams of measured QPSK and 16-QAM symbols . 11
Figure 2 – Error vector magnitude D(k) of a single QPSK symbol . 13
Figure A.1 – In-phase and quadrature histograms of a QPSK signal . 22
Figure A.2 – In-phase and quadrature histograms of a 16-QAM signal . 23

Table A.1 – Q-factor parameters for a QPSK signal . 22
Table A.2 – Q-factor parameters for a 16-QAM signal . 24

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC COMMUNICATION SUBSYSTEM TEST PROCEDURES –

Part 2-13: Digital systems – Measurement of error vector magnitude

FOREWORD
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IEC 61280-2-13 has been prepared by subcommittee 86C: Fibre optic systems and active
devices, of IEC technical committee 86: Fibre optics. It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
86C/1900/CDV 86C/1924/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.

– 4 – IEC 61280-2-13:2024 © IEC 2024
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