EN 61280-2-8:2003
(Main)Fibre optic communication subsystem test procedures - Digital systems - Part 2-8: Determination of low BER using Q-factor measurements
Fibre optic communication subsystem test procedures - Digital systems - Part 2-8: Determination of low BER using Q-factor measurements
Provides two main methods for the determination of low BER values by making accelerated measurements. The two main methods are the variable decision threshold method (clause 4) and the variable optical method (clause 5). In addition a third method, the sinusodial interference method, is described in Annex B.
Prüfverfahren für Lichtwellenleiter-Kommunikationsuntersysteme - Digitale Systeme - Teil 2-8: Bestimmung von geringen Bitfehlerverhältnissen (BERs) mit Hilfe von Q-Faktormessungen
Procédures d'essai des sous-systèmes de télécommunication à fibres optiques - Systèmes numériques - Partie 2-8: Détermination du faible Taux d'Erreur Binaire (TEB) en utilisant les mesures du facteur Q
Provides two main methods for the determination of low BER values by making accelerated measurements. The two main methods are the variable decision threshold method (clause 4) and the variable optical method (clause 5). In addition a third method, the sinusodial interference method, is described in Annex B.
Preskusni postopki komunikacijskega podsistema optičnih vlaken – Digitalni sistemi – 2-8. del: Ugotavljanje nizkega razmerja bitne napake (BER) s pomočjo meritev Q-faktorja (IEC 61280-2-8:2003)*
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SLOVENSKI SIST EN 61280-2-8:2004
STANDARD
september 2004
Preskusni postopki komunikacijskega podsistema optičnih vlaken – Digitalni
sistemi – 2-8. del: Ugotavljanje nizkega razmerja bitne napake (BER) s
pomočjo meritev Q-faktorja (IEC 61280-2-8:2003)*
Fibre optic communication subsystem test procedures - Digital systems - Part 2-8:
Determination of low BER using Q-factor measurements (IEC 61280-2-8:2003)
ICS 33.180.01 Referenčna številka
© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno
EUROPEAN STANDARD EN 61280-2-8
NORME EUROPÉENNE
EUROPÄISCHE NORM April 2003
ICS 33.180.10
English version
Fibre optic communication subsystem test procedures -
Digital systems
Part 2-8: Determination of low BER using Q-factor measurements
(IEC 61280-2-8:2003)
Procédures d'essai des sous-systèmes Prüfverfahren für Lichtwellenleiter-
de télécommunications à fibres optiques - Kommunikationsuntersysteme -
Systèmes numériques Digitale Systeme
Partie 2-8: Détermination du faible Teil 2-8: Bestimmung von geringen
Taux d'Erreur Binaire (TEB) Bitfehlerverhältnissen (BERs)
en utilisant les mesures du facteur Q mit Hilfe von Q-Faktormessungen
(CEI 61280-2-8:2003) (IEC 61280-2-8:2003)
This European Standard was approved by CENELEC on 2003-03-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61280-2-8:2003 E
Foreword
The text of document 86C/485/FDIS, future edition 1 of IEC 61280-2-8, prepared by SC 86C, Fibre optic
systems and active devices, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC parallel
vote and was approved by CENELEC as EN 61280-2-8 on 2003-03-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2003-12-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2006-03-01
Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annex A is normative and annex B is informative.
__________
Endorsement notice
The text of the International Standard IEC 61280-2-8:2003 was approved by CENELEC as a European
Standard without any modification.
__________
INTERNATIONAL IEC
STANDARD 61280-2-8
First edition
2003-02
Fibre optic communication subsystem test
procedures – Digital systems
Part 2-8:
Determination of low BER
using Q-factor measurements
© 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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International Electrotechnical Commission
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For price, see current catalogue
– 2 – 61280-2-8 © IEC:2003(E)
CONTENTS
FOREWORD . 4
1 Scope . 5
2 Definitions and abbreviated terms . 5
2.1 Definitions . 5
2.2 Abbreviations. 5
3 Measurement of low bit-error ratios . 6
3.1 General considerations . 6
3.2 Background to Q-factor . 7
4 Variable decision threshold method . 9
4.1 Overview . 9
4.2 Apparatus .12
4.3 Sampling and specimens .12
4.4 Procedure.12
4.5 Calculations and interpretation of results .13
4.6 Test documentation .17
4.7 Specification information .17
5 Variable optical threshold method.17
5.1 Overview .17
5.2 Apparatus .18
5.3 Items under test.18
5.4 Procedure for basic optical link .18
5.5 Procedure for self-contained system .19
5.6 Evaluation of results.20
Annex A (normative) Calculation of error bound in the value of Q .22
Annex B (informative) Sinusoidal interference method .24
Bibliography .30
Figure 1 – A sample eye diagram showing patterning effects . 8
Figure 2 – A more accurate measurement technique using a DSO that samples the
noise statistics between the eye centres . 8
Figure 3 – Bit error ratio as a function of decision threshold level .10
Figure 4 – Plot of Q-factor as a function of threshold voltage .10
Figure 5 – Set-up for the variable decision threshold method .12
Figure 6 – Set-up of initial threshold level (approximately at the centre of the eye) .12
Figure 7 – Effect of optical bias .17
Figure 8 – Set-up for optical link or device test.19
Figure 9 – Set-up for system test .19
Figure 10 – Extrapolation of log BER as function of bias .21
Figure B.1 – Set-up for the sinusoidal interference method by optical injection .25
Figure B.2 – Set-up for the sinusoidal interference method by electrical injection .27
Figure B.3 – BER Result from the sinusoidal interference method
(data points and extrapolated line) .28
Figure B.4 – BER versus optical power for three methods .29
61280-2-8 © IEC:2003(E) – 3 –
Table 1 – Mean time for the accumulation of 15 errors as a function of BER and bit rate . 6
Table 2 – BER as function of threshold voltage .14
Table 3 – f as a function of D .14
i i
Table 4 – Values of linear regression constants .15
Table 5 – Mean and standard deviation.16
Table 6 – Example of optical bias test.20
Table B.1 – Results for sinusoidal injection.26
– 4 – 61280-2-8 © IEC:2003(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC COMMUNICATION SUBSYSTEM TEST PROCEDURES –
DIGITAL SYSTEMS –
Part 2-8: Determination of low BER
using Q-factor measurements
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organisation for standardisation comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardisation 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 organisations liasing with
the IEC also participate in this preparation. The IEC collaborates closely with the International Organisation for
Standardisation (ISO) in accordance with conditions determined by agreement between the two organisations.
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 61280-2-8 has been prepared by subcommittee 86C: Fibre optic
systems and active devices, of IEC technical committee 86: Fibre optics.
The text of this standard is based on the following documents:
FDIS Report on voting
86C/485/FDIS 86C/505/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 2.
The committee has decided that the contents of this publication will remain unchanged
until 2010. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
61280-2-8 © IEC:2003(E) – 5 –
FIBRE OPTIC COMMUNICATION SUBSYSTEM TEST PROCEDURES –
DIGITAL SYSTEMS –
Part 2-8: Determination of low BER
using Q-factor measurements
1 Scope
This part of IEC 61280 specifies two main methods for the determination of low BER values by
making accelerated measurements. These include the variable decision threshold method
(Clause 4) and the variable optical threshold method (Clause 5). In addition, a third method,
the sinusoidal interference method, is described in Annex B.
2 Definitions and abbreviated terms
2.1 Definitions
For the purposes of this document, the following terms and definitions apply.
2.1.1
amplified spontaneous emission
ASE
impairment generated in optical amplifiers
2.1.2
bit error ratio
BER
the number bits in error as a ratio of the total number of bits
2.1.3
intersymbol interference
ISI
mutual interference between symbols in a data stream, usually caused by non-linear effects
and bandwidth limitations of the transmission path
2.1.4
Q-factor
Q
ratio of the difference between the mean voltage of the
...
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