1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 61290-4-2:2011Optical amplifiers Testmethods Part 4-2: Gain transient parameters Broadband source methodBS EN 61290-4-2:2011 BRITISH STANDARDNational forewordThis British S
2、tandard is the UK implementation of EN61290-4-2:2011. It is identical to IEC 61290-4-2:2011.The UK participation in its preparation was entrusted to TechnicalCommittee GEL/86/3, Fibre optic systems and active devices.A list of organizations represented on this committee can beobtained on request to
3、its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 68184 4ICS 33.180.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was
4、 published under the authority of theStandards Policy and Strategy Committee on 31 October 2011.Amendments issued since publicationDate T e x t a f f e c t e dBS EN 61290-4-2:2011EUROPEAN STANDARD EN 61290-4-2 NORME EUROPENNE EUROPISCHE NORM September 2011 CENELEC European Committee for Electrotechn
5、ical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr 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 6129
6、0-4-2:2011 E ICS 33.180.30 English version Optical amplifiers - Test methods - Part 4-2: Gain transient parameters - Broadband source method (IEC 61290-4-2:2011) Amplificateurs optiques - Mthodes dessai - Partie 4-2: Paramtres de gain transitoire - Mthode par source large bande (CEI 61290-4-2:2011)
7、Lichtwellenleiter-Verstrker - Prfverfahren - Teil 4-2: Transiente Verstrkerparameter -Breitbandquellen Verfahren (IEC 61290-4-2:2011) This European Standard was approved by CENELEC on 2011-08-17. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the condit
8、ions 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 thr
9、ee 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 electrotechnic
10、al 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, Switzer
11、land and the United Kingdom. BS EN 61290-4-2:2011EN 61290-4-2:2011 - 2 - Foreword The text of document 86C/957/CDV, future edition 1 of IEC 61290-4-2, 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 approv
12、ed by CENELEC as EN 61290-4-2:2011. 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) 2012-05-17 latest date by which the national standards conflicting with the document h
13、ave to be withdrawn (dow) 2014-08-17 This standard is to be used in conjunction with EN 61291-1. 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 pate
14、nt rights. Endorsement notice The text of the International Standard IEC 61290-4-2:2011 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
15、as EN 61290-1-1. IEC 61290-1-2 NOTE Harmonized as EN 61290-1-2. IEC 61290-1-3 NOTE Harmonized as EN 61290-1-3. BS EN 61290-4-2:2011- 3 - EN 61290-4-2:2011 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following referenced d
16、ocuments 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 modifica
17、tions, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 61290-4-1 2011 Optical amplifiers - Test methods - Part 4-1: Gain transient parameters - two-wavelength method EN 61290-4-1 2011 IEC 61291-1 - Optical amplifiers - Part 1: Generic specification EN 61291-1 -
18、2 61290-4-2 IEC:2011 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 . 10 5 Test sample 12 6 Procedure . 12 7 Calculations 13 8 Test resu
19、lts 14 Annex A (informative) Comparison between two-wavelength method and broadband method . 15 Bibliography 17 Figure 1 Definitions of rise and fall times for (a) a channel addition event, and (b) a channel removal event 7 Figure 2 OFA transient gain response for (a) a channel removal event, and (b
20、) a channel addition event 8 Figure 3 Transient measurement test set-up for broadband source method . 11 Figure A.1 Effect of non-flat gain spectrum on gain offset . 15 Figure A.2 Different transient suppression response for different types of saturating signals 16 Table 1 Examples of “add” and “dro
21、p” scenarios for transient control measurement 13 Table 2 Typical results of transient control measurement for a C-Band EDFA . 14 61290-4-2 IEC:2011 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ OPTICAL AMPLIFIERS TEST METHODS Part 4-2: Gain transient parameters Broadband source method FOREWORD 1) T
22、he 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 a
23、nd 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 c
24、ommittees; 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
25、 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 commit
26、tee 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
27、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 re
28、gional 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,
29、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 ag
30、ents 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
31、, 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
32、 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 61290-4-2 has been prepared by subcommittee 86C: Fibre optic systems and active devices, of IEC technical committe
33、e 86: Fibre optics. This standard shall be used in conjunction with IEC 61291-1. It was established on the basis of the second (2006) edition of that standard. Future standards in this series will carry the new general title as cited above. Titles of existing standards in this series will be updated
34、 at the time of the next edition. 4 61290-4-2 IEC:2011 The text of this standard is based on the following documents: CDV Report on voting 86C/957/CDV 86C/991/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
35、publication has been drafted in accordance with the ISO/IEC Directives, Part 2. 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. The committee has decided that the contents of this publication will remain
36、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
37、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. 61290-4-2 IEC:2011 5 INTRODUCTION This part of IEC 61290-4 is devoted to the subject of optical a
38、mplifiers. 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
39、whole text, a list of all abbreviations used in this standard is given in 3.3. 6 61290-4-2 IEC:2011 OPTICAL AMPLIFIERS TEST METHODS Part 4-2: Gain transient parameters Broadband source method 1 Scope and object This part of IEC 61290-4 applies to optical amplifiers (OAs) and optically amplified elem
40、entary sub-systems. More specifically, it applies to OAs using active fibres (optical fibre amplifiers, OFAs) containing rare-earth dopants, such as erbium doped fibre amplifiers (EDFAs), presently commercially available, as indicated in IEC 61291-1. The object of this part of IEC 61290-4 is to esta
41、blish uniform requirements for accurate and reliable measurements, by means of the broadband source method, of the transient response of OFAs to dynamic changes in their input power, as defined in IEC 61290-4-1:2011. The broadband source method is different from the two-wavelength method described i
42、n IEC 61290-4-1: in that the saturating signal is not located at a single wavelength, but is rather spread out across the entire specified DWDM transmission band of the OFA-under-test (e.g. the C-Band, 1 525 nm to 1 565 nm). Thus, this method may be relevant to the characterization of transient even
43、ts where the DWDM signals that are added or dropped are more or less uniformly spread across the transmission band. The difference between the two measurement methods is discussed in more detail in Annex A. 2 Normative references The following referenced documents are indispensable for the applicati
44、on 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 61290-4-1:2011, Optical amplifiers Test methods Part 4-1: Gain transient parameters Two wavelength method IEC 61291
45、-1, Optical fibre amplifiers Part 1: Generic specification 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. Thi
46、s 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
47、 added, definitions are provided that describe a dynamic event leading to a transient response. Rise and fall time definitions are shown in Figure 1. 61290-4-2 IEC:2011 7 Channel addition startTimeChanneladdition end10 %of change100 %of change90 % of changeInput power to EDFA (linear a.u.)Risetime(a
48、)Channel removal startChannelremoval end10 %of change100 %of change90 %of changeFalltimeInput power to EDFA (linear a.u.)(b)TimeFigure 1 Definitions of rise and fall times for (a) a channel addition event, and (b) a channel removal event The parameters generally used to characterize the transient ga
49、in behaviour of a gain controlled OFA for the case of channel addition/removal are defined in Figure 2. Figure 2(a) specifically represents the time dependence of the gain of one of the surviving channels when channels are removed. Likewise the transient gain behaviour of a pre-existing channel for the case when channels are added is shown in Figure 2(b). The main transient parameters are: transient gain IEC 1582/11 IEC 1583/11 8 61290-4-2 IEC:2011 response t
