IEC 60728-6:2001

INTERNATIONAL IEC
STANDARD
60728-6
First edition
2001-01
Cabled distribution systems
for television and sound signals –
Part 6:
Optical equipment
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INTERNATIONAL IEC
STANDARD
60728-6
First edition
2001-01
Cabled distribution systems
for television and sound signals –
Part 6:
Optical equipment
 IEC 2001  Copyright - all rights reserved
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– 2 – 60728-6  IEC:2001(E)
CONTENTS
Page
FOREWORD . 4

INTRODUCTION .5

Clause
1 Scope . 6

2 Normative references . 6
3 Terms, definitions, symbols and abbreviations . 7
3.1 Terms and definitions. 7
3.2 Symbols. 11
3.3 Abbreviations . 13
4 Methods of measurement . 14
4.1 General measurement requirements. 14
4.2 Optical power. 14
4.3 Loss, isolation, directivity and coupling ratio . 15
4.4 Return loss . 16
4.5 Saturation of output power of an optical amplifier. 18
4.6 Influence of polarization . 19
4.7 Central wavelength and spectral width under modulation . 20
4.8 Linewidth and chirp of transmitters with single-mode lasers . 21
4.9 Extinction ratio . 23
4.10 Optical modulation index . 25
4.11 Voltage responsivity of an optical receiver . 26
4.12 Frequency range and flatness . 27
4.13 Composite second-order distortion (CSO) of optical transmitters . 28
4.14 Composite triple beats (CTB) of optical transmitters . 29
4.15 Composite cross-modulation of optical transmitters . 30
4.16 Receiver intermodulation. 33
4.17 CSO of optical amplifiers. 36
4.18 CTB of optical amplifiers . 36
4.19 Carrier-to-noise ratio . 36
4.20 Method for combined measurement of relative intensity noise (RIN), optical

modulation index and equivalent input noise current . 40
4.21 Noise figure of optical amplifiers. 42
4.22 Bit error rate (BER) . 44
4.23 Influence of dispersion . 45
5 Universal performance requirements and recommendations . 46
5.1 Safety . 46
5.2 Electromagnetic compatibility (EMC) . 46
5.3 Environmental. 46
5.4 Marking. 47
6 Active equipment. 47
6.1 Optical transmitters . 47
6.2 Optical receivers . 48
6.3 Optical amplifiers . 49

60728-6  IEC:2001(E) – 3 –
Clause Page
7 Passive equipment . 50

7.1 Connectors and splices . 50

7.2 Multiplexers, splitters, directional couplers and isolators . 50

Figure 1 – Measurement of optical power. 15

Figure 2 – Measurement of optical loss, directivity and isolation . 16

Figure 3 – Measurement of the optical return loss . 17

Figure 4 – Measurement of the saturation of the optical output power. 18
Figure 5 – Saturated optical output power . 19
Figure 6 – Measurement of the polarization stability . 20
Figure 7 – Measurement of central wavelength and spectral width under modulation . 21
Figure 8 – Measurement of the chirp and the linewidth of transmitters. 22
Figure 9 – Measurement of the extinction ratio. 24
Figure 10 – Measurement of the optical modulation index . 25
Figure 11 – Measurement of the voltage responsivity of an optical receiver . 27
Figure 12 – Measurement of the frequency range and flatness . 28
Figure 13 – Device under test for measuring CSO of optical transmitters. 29
Figure 14 – Device under test for measuring CTB of optical transmitters . 30
Figure 15 – Arrangement for measuring composite cross-modulation
of optical transmitters . 32
Figure 16 – Arrangement of test equipment for measuring receiver intermodulation. 35
Figure 17 – System with internal noise sources . 36
Figure 18 – PIN diode receiver. 37
Figure 19 – Optical transmission system under test. 38
Figure 20 – Arrangement of test equipment for carrier-to-noise measurement . 39
Figure 21 – Measurement set-up for determination of the noise parameters
and the optical modulation index. 41
Figure 22 – Measurement of the noise figure of an optical amplifier. 43
Figure 23 – Measurement of the bit error rate . 45

– 4 – 60728-6  IEC:2001(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION

___________
CABLED DISTRIBUTION SYSTEMS FOR TELEVISION

AND SOUND SIGNALS –
Part 6: Optical equipment
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60728-6 has been prepared by subcommittee 100D: Cabled
distribution systems, of IEC technical committee 100: Audio, video and multimedia systems and
equipment.
The text of this standard is based on the following documents:
FDIS Report on voting
100/169/FDIS 100/198/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.
The committee has decided that the contents of this publication will remain unchanged until
2002. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition; or
• amended.
A bilingual version of this standard may be issued at a later date.

60728-6  IEC:2001(E) – 5 –
INTRODUCTION
Standards of the IEC 60728 series deal with cable networks for television signals, sound

signals and interactive services including equipment, systems and installations

– for headend-reception, processing and distribution of sound and television signals and their

associated data signals, and
– for processing, interfacing and transmitting all kinds of interactive multimedia signals using

all applicable transmission media.

They cov
...