SIST EN 61290-4-1:2011
(Main)Optical amplifiers - Test methods - Part 4-1: Gain transient parameters - Two-wavelength method (IEC 61290-4-1:2011)
Optical amplifiers - Test methods - Part 4-1: Gain transient parameters - Two-wavelength method (IEC 61290-4-1:2011)
This part of IEC 61290-4 applies to erbium-doped fibre amplifiers (EDFAs) and optically amplified elementary sub-systems. It applies to OAs using active fibres (optical fibre amplifiers, OFAs), containing rare-earth dopants. These amplifiers are commercially available and widely deployed in service provider networks. The object of this part of IEC 61290-4 is to provide the general background for EDFA transients and related parameters, and to describe a standard test method for accurate and reliable measurement of the following transient parameters: - Channel addition/removal transient gain overshoot and transient net gain overshoot - Channel addition/removal transient gain undershoot and transient net gain undershoot - Channel addition/removal gain offset - Channel addition/removal transient gain response time constant (settling time)
Lichtwellenleiter-Verstärker - Prüfverfahren - Teil 4-1: Transiente Verstärkerparameter - Zwei-Wellenlängen Verfahren (IEC 61290-4-1:2011)
Amplificateurs optiques - Méthodes d’essai - Partie 4-1: Paramètres de gain transitoire - Méthode à deux longueurs d'onde (CEI 61290-4-1:2011)
La CEI 62190-4-1:2011 s'applique aux amplificateurs à fibre dopée à l'erbium (EDFA) et aux sous-systèmes élémentaires à amplification optique. Elle s'applique aux AO utilisant des fibres actives (amplificateurs à fibres optiques, AFO), contenant des dopants aux terres rares. Ces amplificateurs sont disponibles sur le marché et sont largement déployés dans les réseaux de prestataires de service.
Optični ojačevalniki - Preskusne metode - 4-1. del: Prehodni parametri ojačenja - Dvovalovna metoda (IEC 61290-4-1:2011)
Ta del IEC 61290-4 velja za optične ojačevalnike (EDFA), ojačene z erbijem, in optično ojačene elementarne podsisteme. Velja za optične ojačevalnike, ki uporabljajo aktivna vlakna (ojačevalniki z optičnimi vlakni, OFA), ki vsebujejo ojačitve z redkimi zemeljskimi elementi. Ti ojačevalniki so komercialno dostopni in se široko uporabljajo v omrežjih ponudnikov storitev. Namen tega dela IEC 61290-4 je zagotoviti splošno ozadje za prehodne in sorodne parametre EDFA in opisati standardno preskusno metodo za točno in zanesljivo merjenje naslednjih prehodnih parametrov: - dodajanje/odvzemanje kanalov s prehodno prekoračitvijo in neto prehodno prekoračitvijo – dodajanje/odvzemanje kanalov s prehodnim primanjkljajem in prehodnim neto primanjkljajem – dodajanje/odvzemanja kanalov z izravnavo – dodajanje/odvzemanje kanalov s prehodno konstanto odzivnega časa (čas umirjanja).
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Lichtwellenleiter-Verstärker - Prüfverfahren - Teil 4-1: Transiente Verstärkerparameter - Zwei-Wellenlängen Verfahren (IEC 61290-4-1:2011)Amplificateurs optiques - Méthodes d’essai - Partie 4-1: Paramètres de gain transitoire - Méthode à deux longueurs d'onde (CEI 61290-4-1:2011)Optical amplifiers - Test methods - Part 4-1: Gain transient parameters - Two-wavelength method (IEC 61290-4-1:2011)33.180.30Optic amplifiersICS:Ta slovenski standard je istoveten z:EN 61290-4-1:2011SIST EN 61290-4-1:2011en01-november-2011SIST EN 61290-4-1:2011SLOVENSKI
STANDARD
SIST EN 61290-4-1:2011
EUROPEAN STANDARD EN 61290-4-1 NORME EUROPÉENNE
EUROPÄISCHE NORM September 2011
CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2011 CENELEC -
All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61290-4-1:2011 E
ICS 33.180.30
English version
Optical amplifiers -
Test methods -
Part 4-1: Gain transient parameters -
Two-wavelength method (IEC 61290-4-1:2011)
Amplificateurs optiques -
Méthodes d’essai -
Partie 4-1: Paramètres de gain
transitoire - Méthode à deux longueurs d'onde (CEI 61290-4-1:2011)
Lichtwellenleiter-Verstärker -
Prüfverfahren -
Teil 4-1: Transiente Verstärkerparameter -Zwei-Wellenlängen Verfahren (IEC 61290-4-1:2011)
This European Standard was approved by CENELEC on 2011-09-14. 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, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
SIST EN 61290-4-1:2011
EN 61290-4-1:2011 - 2 - Foreword The text of document 86C/956/CDV, future edition 1 of IEC 61290-4-1, 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 approved by CENELEC as EN 61290-4-1:2011.
The following dates are fixed: • latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2012-06-14 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2014-09-14
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights.
Endorsement notice The text of the International Standard IEC 61290-4-1:2011 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 61290-1-1 NOTE
Harmonized as EN 61290-1-1. IEC 61290-1-2 NOTE
Harmonized as EN 61290-1-2. IEC 61290-1-3 IEC 61290-3-1 IEC 61290-3-2 IEC 61290-4-2
NOTE
Harmonized as EN 61290-1-3. NOTE
Harmonized as EN 61290-3-1. NOTE
Harmonized as EN 61290-3-2. NOTE
Harmonized as EN 61290-4-2. SIST EN 61290-4-1:2011
- 3 - EN 61290-4-1:2011 Annex ZA
(normative)
Normative references to international publications with their corresponding European publications
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
NOTE
When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.
Publication Year Title EN/HD Year
IEC 61291-1 - Optical amplifiers -
Part 1: Generic specification EN 61291-1 -
SIST EN 61290-4-1:2011
SIST EN 61290-4-1:2011
IEC 61290-4-1 Edition 1.0 2011-08 INTERNATIONAL STANDARD NORME INTERNATIONALE Optical amplifiers – Test methods –
Part 4-1: Gain transient parameters – Two-wavelength method
Amplificateurs optiques – Méthodes d’essai –
Partie 4-1: Paramètres de gain transitoire – Méthode à deux longueurs d'onde
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE R ICS 33.180.30 PRICE CODE CODE PRIX ISBN 978-2-88912-614-9
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale ®
SIST EN 61290-4-1:2011 colourinside
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CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope and object . 6 2 Normative references. 6 3 Terms, definitions and abbreviations . 6 3.1 General . 6 3.2 Terms and definitions . 9 3.3 Abbreviated terms . 10 4 Apparatus . 11 5 Test specimen . 11 6 Procedure . 11 7 Calculations . 12 8 Test results . 12 Annex A (informative)
Background on transient phenomenon in optical amplifiers . 13 Annex B (informative)
Slew rate effect on transient gain response . 16 Bibliography . 19
Figure 1 – Definitions of rise and fall times (a) in the case of a channel addition event, and (b) in the case of a channel removal event . 7 Figure 2 – OFA transient gain response for (a) a channel removal event, and (b) a channel addition event . 8 Figure 3 – Generic transient control measurement setup . 11 Figure A.1 – EDFA pump control for a chain of 5 EDFAs and 4 fibre spans . 14 Figure A.2 – EDFA spectral hole depth for different gain compression . 15 Figure A.3 – EDFA spectral hole depth for different wavelengths . 15 Figure B.1 – Transient gain response at various slew rates . 17 Figure B.2 – 16 dB add/drop (rise time = 10 µsec) . 18 Figure B.3 – 16 dB add/drop (rise time = 1 000 µsec) . 18
Table 1 – Examples of add and drop scenarios for transient control measurement . 12 Table 2 – Typical results of transient control measurement . 12 Table B.1 – Transient gain response for various rise time and fall time (16 dB add/drop) . 17
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61290-4-1 © IEC:2011 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
OPTICAL AMPLIFIERS –
TEST METHODS –
Part 4-1: Gain transient parameters –
Two-wavelength method
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, Publicly Available Specifications (PAS) 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 interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61290-4-1 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: CDV Report on voting 86C/956/CDV 86C/1011/RVC
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. SIST EN 61290-4-1:2011
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A list of all parts of the IEC 61290 series, published under the general title Optical amplifiers – Test methods can be found on the IEC website. Future standards in this series will carry the new general title as cited above. Titles of existing standards in this series will be updated at the time of the next edition. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to the specific publication. At this date, the publication will be
• reconfirmed, • withdrawn, • replaced by a revised edition, or • amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer.
SIST EN 61290-4-1:2011
61290-4-1 © IEC:2011 – 5 –
INTRODUCTION This part of IEC 61290-4 is devoted to the subject of Optical Amplifiers (OAs). The technology of optical amplifiers is quite new and still emerging; hence amendments and new editions to this standard can be expected. Each abbreviation introduced in this standard is explained in the text at least the first time it appears. However, for an easier understanding of the whole text, a list of all abbreviations used in this standard is given in 3.3. Background information on the transient phenomenon in erbium-doped fibre amplifiers and the consequences on fibre optic systems is provided in Annex A and on slew rate effects in Annex B.
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OPTICAL AMPLIFIERS –
TEST METHODS –
Part 4-1: Gain transient parameters –
Two-wavelength method
1 Scope and object This part of IEC 61290-4 applies to erbium-doped fibre amplifiers (EDFAs) and optically amplified elementary sub-systems. It applies to OAs using active fibres (optical fibre amplifiers, OFAs), containing rare-earth dopants. These amplifiers are commercially available and widely deployed in service provider networks. The object of this part of IEC 61290-4 is to provide the general background for EDFA transients and related parameters, and to describe a standard test method for accurate and reliable measurement of the following transient parameters:
• Channel addition/removal transient gain overshoot and transient net gain overshoot • Channel addition/removal transient gain undershoot and transient net gain undershoot • Channel addition/removal gain offset
• Channel addition/removal transient gain response time constant (settling time) 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 61291-1, Optical amplifiers – Part 1: Generic specification
NOTE A list of informative references is given in the Bibliography. 3 Terms, definitions and abbreviations 3.1 General When the input power to an OFA operating in saturation changes sharply, the gain of the amplifier will typically exhibit a transient response before settling back into the required gain. This response is dictated both by the optical characteristics of the active fibre within the OFA as well as the performance of the automatic gain control (AGC) mechanism.
Since a change in input power typically occurs when part of the DWDM channels within the specified transmission band are dropped or added, definitions are provided that describe a dynamic event leading
to transient response. Rise and fall time definitions are shown in Figure 1.
SIST EN 61290-4-1:2011
61290-4-1 © IEC:2011 – 7 –
Channel addition startTimeChanneladdition end10 %of change100 %of change90 % of changeInput power to EDFA
(linear a.u.)Risetime(a) Channel removal startChannelremoval end10 %of change100 %of change90 %of changeFalltimeInput power to EDFA
(linear a.u.)(b)Time
Figure 1 – Definitions of rise and fall times (a) in the case of a channel addition event, and (b) in the case of a channel removal event The parameters generally used to characterize the transient gain behaviour of a gain controlled EDFA for the case of channel removal are defined in Figure 2(a). The figure specifically represents the time dependence of the gain of one of the surviving channels when channels IEC
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are removed. Likewise, the transient gain behaviour for the case when channels are added is shown in Figure 2(b). The main transient parameters are: transient gain response time constant (setting time), gain offset, transient net gain overshoot, and transient gain net undershoot. The transient gain overshoot and undershoot are particularly critical to carriers and network equipment manufacturers (NEMs) given that the speed and amplitude of gain fluctuations compound through the network as the optical signal passes through an increasing number of cascaded amplifiers. Properly designed optical amplifiers have very small values for these transient parameters.
Gain
(dB)TimeGain overshootNet gainundershootTransient gain response time constant (settling time)Net gain overshootGain undershootGain stabilityInitial gainFinalgain(a)Gain offset Gain
(dB)TimeNet gainOvershootGain undershootTransient gain response time constant (settling time)GainovershootNet gain undershootGain stabilityInitialgainFinal gain(b)Gain offset Figure 2 – OFA transient gain response for (a) a channel removal event, and (b) a channel addition event IEC
1584/11 IEC
1585/11 SIST EN 61290-4-1:2011
61290-4-1 © IEC:2011 – 9 –
3.2 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 61291-1 and the following apply. 3.2.1 surviving (pre-existing) signal
optical signal that remains (exists) after (before) drop (add) event 3.2.2 saturating signal
optical signal that is switched off (on) by the drop (add) event
3.2.3 drop (add) level
amount in dB by which the input power decreases (increases) due to dropping (adding) of channels 3.2.4 add rise time time it takes for the input optical signal to rise from 10 % to 90 % of the total difference between the initial and final signal levels during an add event (see Figure 1(a))
3.2.5 drop fall time time it takes for the input optical signal to fall from 10 % to 90 % of the total difference between the initial and final signal levels during a drop event (see Figure 1 (b))
3.2.6 initial gain
gain of the surviving (pre-existing) channel before a drop (add) event 3.2.7 final gain
steady state gain of the surviving (pre-existing) channel a very long time (i.e. once the gain has stabilized) after a drop (add) event 3.2.8 gain offset
Change in dB of the gain between initial and final state, defined as final gain – initial gain NOTE Gain offset may be positive or negative for both channel addition and removal events
3.2.9 gain stability
specified peak-to-peak gain fluctuations of the OFA under steady state conditions (i.e. not in response to a transient event)
3.2.10 transient gain response time constant (settling time) amount of time required to bring the gain of the surviving (pre-existing) channel to the final gain
NOTE 1 This parameter is the measured time from the beginning of the drop (add) event that created the transient gain response, to the time at which the surviving (pre-existing) channel gain first enters within the gain stability band centred on the final gain. NOTE 2 Hereon this will also be referred to as settling time
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3.2.11 transient gain overshoot difference in dB between the maximum surviving (pre-existing) channel gain reached during the OFA transient response to a drop (add) event, and the lowest of either the initial gain and final gain NOTE Hereon this will also be referred to a
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