IEC 60728-6:2003

INTERNATIONAL IEC
STANDARD
60728-6
Second edition
2003-07
Cable networks for television signals,
sound signals and interactive services –
Part 6:
Optical equipment
Reference number
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INTERNATIONAL IEC
STANDARD
60728-6
Second edition
2003-07
Cable networks for television signals,
sound signals and interactive services –
Part 6:
Optical equipment
 IEC 2003  Copyright - all rights reserved
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 the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch  Web: www.iec.ch
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Commission Electrotechnique Internationale
XA
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – 60728-6  IEC:2003(E)
CONTENTS
FOREWORD . 4
INTRODUCTION .6
1 Scope . 7
2 Normative references. 7
3 Terms, definitions, symbols and abbreviations. 8
4 Methods of measurement.17
4.1 General measurement requirements .17
4.2 Optical power.17
4.3 Loss, isolation, directivity and coupling ratio .18
4.4 Return loss .19
4.5 Saturation output power of an optical amplifier .20
4.6 Polarization dependent loss .21
4.7 Centroidal wavelength and spectral width under modulation.22
4.8 Linewidth and chirping of transmitters with single mode lasers.23
4.9 Optical modulation index .25
4.10 Reference output level of an optical receiver .26
4.11 Slope and flatness .27
4.12 Composite second order distortion (CSO) of optical transmitters .29
4.13 Composite triple beats (CTB) of optical transmitters .30
4.14 Composite crossmodulation of optical transmitters .31
4.15 Receiver intermodulation.33
4.16 CSO of optical amplifiers.36
4.17 CTB of optical amplifiers .36
4.18 Carrier-to-noise ratio.36
4.19 Method for combined measurement of relative intensity noise (RIN), optical
modulation index and equivalent input noise current .40
4.20 Noise figure of optical amplifiers .42
4.21 Influence of fibre.43
4.22 SBS threshold.43
5 Universal performance requirements and recommendations .44
5.1 Safety.44
5.2 Electromagnetic compatibility (EMC) .44
5.3 Environmental.44
5.4 Marking .45
6 Active equipment .45
6.1 Optical downlink transmitters .45
6.2 Optical uplink transmitters.47
6.3 Optical receivers .49
6.4 Optical amplifiers .51
7 Passive equipment.52
7.1 Connectors and splices .52
7.1.1 Data publication requirements .52
Annex A (informative) A simplified method of measurement for return loss.53
Annex B (informative) Product specification worksheets for optical amplifiers.55
Bibliography .58

60728-6  IEC:2003(E) – 3 –
Figure 1 – Measurement of optical power.18
Figure 2 – Measurement of optical loss, directivity and isolation.19
Figure 3 – Measurement of the optical return loss.20
Figure 4 – Optical saturation output power .21
Figure 5 – Measurement of the polarization dependent loss .21
Figure 6 – Measurement of central wavelength and spectral width under modulation .22
Figure 7 – Measurement of the chirping and the linewidth of transmitters .24
Figure 8 – Measurement of the optical modulation index .26
Figure 9 – Measurement of the reference output level of an optical receiver .27
Figure 10 – Measurement of the frequency range and flatness.28
Figure 11 – Evaluation of the slope.28
Figure 12 – Evaluating the flatness .29
Figure 13 – Device under test for measuring CSO of optical transmitters .30
Figure 14 – Device under test for measuring CTB of optical transmitters .31
Figure 15 – Arrangement for measuring composite crossmodulation 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 .38
Figure 21 – Measurement set-up for determination of the noise parameters and the
optical modulation index .42
Figure 22 – Arrangement for measuring the SBS threshold .44
Figure 23 – Classification of uplink transmitters .48
Figure A.1 – Test set-up for calibration .53
Figure A.2 – Measurement of the optical power of the light source .54
Figure A.3 – Test set-up for device under test.54
Figure A.4 – Measurement of the optical power at port A.54
Table 1 – Noise correction factors C for different noise level differences D.40
n
Table 2 – Data publication requirements for optical downlink transmitters .46
Table 3 – Recommendations for optical downlink transmitters.46
Table 4 – Requirements for optical downlink transmitters.47
Table 5 – Data publication requirements for optical uplink transmitters.48
Table 6 – Recommendations for optical uplink transmitters .49
Table 7 – Requirements for optical uplink transmitters .49
Table 8 – Classification of optical receivers .50
Table 9 – Data publication requirements for optical receivers .50
Table 10 – Recommendations for optical receivers .50
Table 11 – Performance requirements for optical receivers .51
Table B.1 – Minimum list of relevant parameters of power amplifiers to be specified for
analogue applications .55
Table B.2 – Minimum list of relevant parameters of line amplifiers to be specified for
analogue applications .56
Table B.3 – Minimum list of relevant parameters of optically amplified transmitters
(OAT) to be specified for analogue applications .57

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INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
CABLE NETWORKS FOR TELEVISION SIGNALS,
SOUND SIGNALS AND INTERACTIVE SERVICES –
Part 6: Optical equipment
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, 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
intereste
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