IEC 61280-2-2:2012

Fibre optic communication subsystem test procedures - Part 2-2: Digital systems - Optical eye pattern, waveform and extinction ratio measurement

IEC 61280-2-2:2012 describes a test procedure to verify compliance with a predetermined waveform mask and to measure the eye pattern and waveform parameters such as rise time, fall time, modulation amplitude and extinction ratio. This fourth edition cancels and replaces the third edition published in 2008 and constitutes a technical revision .This edition includes the following significant technical changes with respect to the previous edition: additional definitions; clarification of test procedures. Keywords: optical eye pattern, waveform, modulation amplitude, extinction ratio The contents of the corrigendum of February 2015 have been included in this copy.

Procédures d’essai des sous-systèmes de télécommunication fibroniques - Partie 2-2: Systèmes numériques - Mesure du diagramme de l’œil optique, de la forme d’onde et du taux d’extinction

IEC 61280-2-2:2012 décrit une procédure d’essai pour vérifier la conformité à un masque de forme d’onde prédéterminé et mesurer le diagramme de l’œil et les paramètres de la forme d’onde tels que le temps de montée, le temps de descente, l'amplitude de modulation et le taux d’extinction. Cette quatrième édition annule et remplace la troisième édition parue en 2008 et constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: définitions supplémentaires; clarification des procédures d'essai.
La présente version bilingue (2020-09) correspond à la version anglaise monolingue publiée en 2012-10.

General Information

• Status: Published
• Publication Date: 24-Oct-2012
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 33.180.01 - Fibre optic systems in general
• 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: 31-Jan-2013
• Completion Date: 25-Oct-2012

Relations

• Corrected By: IEC 61280-2-2:2012/COR1:2015 - Corrigendum 1 - Fibre optic communication subsystem test procedures - Part 2-2: Digital systems - Optical eye pattern, waveform and extinction ratio measurement
• Effective Date: 05-Sep-2023
• Revises: IEC 61280-2-2:2008 - Fibre optic communication subsystem test procedures - Part 2-2: Digital systems - Optical eye pattern, waveform and extinction ratio measurement
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61280-2-2 ®
Edition 4.0 2012-10
INTERNATIONAL
STANDARD
colour
inside
Fibre optic communication subsystem test procedures –
Part 2-2: Digital systems – Optical eye pattern, waveform and extinction ratio
measurement
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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IEC 61280-2-2 ®
Edition 4.0 2012-10
INTERNATIONAL
STANDARD
colour
inside
Fibre optic communication subsystem test procedures –

Part 2-2: Digital systems – Optical eye pattern, waveform and extinction ratio

measurement
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
U
ICS 33.180.01 ISBN 978-2-83220-420-7

– 2 – 61280-2-2 © IEC:2012(E)
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Apparatus . 7
4.1 General . 7
4.2 Reference receiver definition . 8
4.3 Time-domain optical detection system . 8
4.3.1 Overview . 8
4.3.2 Optical-to-electrical (O/E) converter . 9
4.3.3 Linear-phase low-pass filter . 9
4.3.4 Oscilloscope . 10
4.4 Overall system response . 11
4.5 Oscilloscope synchronization system. 11
4.5.1 General . 11
4.5.2 Triggering with a clean clock . 12
4.5.3 Triggering using a recovered clock . 12
4.5.4 Triggering directly on data . 13
4.6 Pattern generator . 14
4.7 Optical power meter . 14
4.8 Optical attenuator . 14
4.9 Test cord . 14
5 Signal under test . 14
6 Instrument set-up and device under test set-up . 14
7 Measurement procedures . 15
7.1 Overview . 15
7.2 Extinction ratio measurement . 15
7.2.1 Configure the test equipment . 15
7.2.2 Measurement procedure . 15
7.2.3 Extinction ratio calculation . 16
7.3 Eye amplitude . 17
7.4 Optical modulation amplitude (OMA) measurement using the square wave
method . 17
7.4.1 General . 17
7.4.2 Oscilloscope triggering . 17
7.4.3 Amplitude histogram, step 1 . 17
7.4.4 Amplitude histogram, step 2 . 18
7.4.5 Calculate OMA . 18
7.5 Contrast ratio (for RZ signals) . 18
7.6 Jitter measurements . 18
7.7 Eye width . 19
7.8 Duty cycle distortion (DCD) . 19
7.9 Crossing percentage . 20
7.10 Eye height . 21

61280-2-2 © IEC:2012(E) – 3 –
7.11 Q-factor/signal-to-noise ratio (SNR). 21
7.12 Rise time . 21
7.13 Fall time . 22
8 Eye-diagram analysis using a mask . 23
8.1 Eye mask testing using the ‘no hits’ technique . 23
8.2 Eye mask testing using the ‘hit-ratio’ technique . 24
9 Test result . 26
9.1 Required information . 26
9.2 Available information . 26
9.3 Specification information . 26
Bibliography . 27

Figure 1 – Optical eye pattern, waveform and extinction ratio measurement
configuration . 8
Figure 2 – Oscilloscope bandwidths commonly used in eye pattern measurements . 10
Figure 3 – PLL jitter transfer function and resulting observed jitter transfer function . 13
Figure 4 – Histograms centred in the central 20 % of the eye used to determine the
mean logic one and 0 levels, b and b . 16
1 0
Figure 5 – OMA measurement using the square wave method . 18
Figure 6 – Construction of the duty cycle distortion measurement . 20
Figure 7 – Construction of the crossing percentage measurement . 21
Figure 8 – Construction of the risetime measurement with no reference receiver
filtering . 22
Figure 9 – Illustrations of several RZ eye-diagram parameters . 23
Figure 10 – Basic eye mask and coordinate system . 24
Figure 11 – Mask margins at different sample population sizes . 26

Table 1 – Frequency response characteristics . 11

– 4 – 61280-2-2 © IEC:2012(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC COMMUNICATION SUBSYSTEM
TEST PROCEDURES –
Part 2-2: Digital systems – Optical eye pattern,
waveform and extinction ratio measurement

FOREWORD
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IEC 61280-2-2 ®
Edition 4.0 2012-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic communication subsystem test procedures –
Part 2-2: Digital systems – Optical eye pattern, waveform and extinction ratio
measurement
Procédures d’éssai des sous-systèmes de télécommunication fibroniques –
Partie 2-2: Systèmes numériques – Mesure du diagramme de l’œil optique,
de la forme d’onde et du taux d’extinction

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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International Standards for all electrical, electronic and related technologies.

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The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
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IEC 61280-2-2 ®
Edition 4.0 2012-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic communication subsystem test procedures –

Part 2-2: Digital systems – Optical eye pattern, waveform and extinction ratio

measurement
Procédures d’éssai des sous-systèmes de télécommunication fibroniques –

Partie 2-2: Systèmes numériques – Mesure du diagramme de l’œil optique,

de la forme d’onde et du taux d’extinction

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.01 ISBN 978-2-8322-8794-1

– 2 – IEC 61280-2-2:2012 © IEC 2012
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Apparatus . 7
4.1 General . 7
4.2 Reference receiver definition . 8
4.3 Time-domain optical detection system . 8
4.3.1 Overview . 8
4.3.2 Optical-to-electrical (O/E) converter . 8
4.3.3 Linear-phase low-pass filter . 9
4.3.4 Oscilloscope . 9
4.4 Overall system response . 10
4.5 Oscilloscope synchronization system. 11
4.5.1 General . 11
4.5.2 Triggering with a clean clock . 11
4.5.3 Triggering using a recovered clock . 12
4.5.4 Triggering directly on data . 13
4.6 Pattern generator . 13
4.7 Optical power meter . 13
4.8 Optical attenuator . 13
4.9 Test cord . 13
5 Signal under test . 14
6 Instrument set-up and device under test set-up . 14
7 Measurement procedures . 15
7.1 Overview . 15
7.2 Extinction ratio measurement . 15
7.2.1 Configure the test equipment . 15
7.2.2 Measurement procedure . 15
7.2.3 Extinction ratio calculation . 16
7.3 Eye amplitude . 17
7.4 Optical modulation amplitude (OMA) measurement using the square wave
method . 17
7.4.1 General . 17
7.4.2 Oscilloscope triggering . 17
7.4.3 Amplitude histogram, step 1 . 17
7.4.4 Amplitude histogram, step 2 . 17
7.4.5 Calculate OMA . 17
7.5 Contrast ratio (for RZ signals) . 18
7.6 Jitter measurements . 18
7.7 Eye width . 19
7.8 Duty cycle distortion (DCD) . 19
7.9 Crossing percentage . 20
7.10 Eye height . 21
7.11 Q-factor/signal-to-noise ratio (SNR). 21
7.12 Rise time . 21

7.13 Fall time . 22
8 Eye-diagram analysis using a mask . 23
8.1 Eye mask testing using the ‘no hits’ technique . 23
8.2 Eye mask testing using the ‘hit-ratio’ technique . 24
9 Test result . 26
9.1 Required information . 26
9.2 Available information . 26
9.3 Specification information . 26
Bibliography . 27

Figure 1 – Optical eye pattern, waveform and extinction ratio measurement
configuration . 8
Figure 2 – Oscilloscope bandwidths commonly used in eye pattern measurements . 10
Figure 3 – PLL jitter transfer function and resulting observed jitter transfer function . 12
Figure 4 – Histograms centred in the central 20 % of the eye used to determine the
mean logic one and 0 levels, b and b . 16
1 0
Figure 5 – OMA measurement using the square wave method . 18
Figure 6 – Construction of the duty cycle distortion measurement . 20
Figure 7 – Construction of the crossing percentage measurement . 21
Figure 8 – Construction of the risetime measurement with no reference receiver
filtering . 22
Figure 9 – Illustrations of several RZ eye-diagram parameters . 23
Figure 10 – Basic eye mask and coordinate system . 24
Figure 11 – Mask margins at different sample population sizes . 26

Table 1 – Frequency response characteristics . 11

– 4 – IEC 61280-2-2:2012
...