IEC 61280-2-2:2008

IEC 61280-2-2
Edition 3.0 2008-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic communication subsystem test procedures –
Part 2-2: Digital systems – Optical eye pattern, waveform and extinction ratio
measurement
Procédures d'essai des sous-systèmes de télécommunications à fibres
optiques –
Partie 2-2: Systèmes numériques – Mesure du diagramme de l’œil optique,
de la forme d’onde et du taux d’extinction

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IEC 61280-2-2
Edition 3.0 2008-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic communication subsystem test procedures –
Part 2-2: Digital systems – Optical eye pattern, waveform and extinction ratio
measurement
Procédures d'essai des sous-systèmes de télécommunications à fibres
optiques –
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
PRICE CODE
INTERNATIONALE
U
CODE PRIX
ICS 33.180.01 ISBN 2-8318-9637-1

– 2 – 61280-2-2 © IEC:2008
CONTENTS
FOREWORD.4

1 Scope and object .6

2 Normative references.6

3 Apparatus.6

3.1 Time-domain optical detection system.7

3.1.1 Optical-to-electrical (O/E) converter .7

3.1.2 Resistive signal splitter (optional).8
3.1.3 Linear-phase low-pass filter .8
3.1.4 Oscilloscope .10
3.1.5 Overall system response.10
3.2 Oscilloscope synchronization system .10
3.3 Pulse pattern generator .11
3.4 Optical power meter.11
3.5 Optical attenuator .11
3.6 Test cord.11
4 Test sample.11
5 Procedure.12
5.1 Method 1: Basic waveform measurement .12
5.2 Method 2: Extinction measurement method using the histogram function.12
6 Calculation .14
6.1 Basic waveform measurement definitions.14
6.2 Method 2: Extinction measurement method using the histogram function.17
6.3 Eye-diagram analysis using a mask .18
7 Test result .19
7.1 Required information .19
7.2 Available information .19
7.3 Specification information.20

Annex A (informative) Oscilloscope synchronization system.23

Bibliography .27

Figure 1 – Optical eye pattern, waveform, and extinction ratio measurement
configuration .6
Figure 2 – Time-domain optical detection system .7
Figure 3 – Illustrations of NRZ and RZ eye-diagram parameters .17
Figure 4 – Example of eye pattern measured with 0,75/T low-pass filter .18
Figure 5 – Example of eye pattern measured with 3,0/T low-pass filter.19
Figure 6 – Eye diagram with vertical histogram data collected from the central 20 %
window.19
Figure A.1 – Oscilloscope synchronization system .23

Table 1 – Frequency response characteristics .10
Table 2 – Typical parameters for the measurement shown in Figure 4 .21

61280-2-2 © IEC:2008 – 3 –
Table 3 – Typical parameters for the measurement shown in Figure 5 .22

Table A.1 – Example lengths of common RG-58 cable.25

– 4 – 61280-2-2 © IEC:2008
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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International Standard IEC 61280-2-2 has been prepared by subcommittee 86C: Fibre optic
systems and active devices, of IEC technical committee 86: Fibre optics.
This third edition cancels and replaces the second edition published in 2005 and constitutes a
technical revision. This edition includes the following significant technical changes with respect
to the previous edition:
a) The necessity of DC coupling for extinction ratio measurement is clarified.
b) The definition of extinction ratio has been revised to better harmonize with ITU-T.
c) The definition of OMA has been clarified.

61280-2-2 © IEC:2008 – 5 –
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