1、 IEC 61290-4-2 Edition 1.0 2011-07 INTERNATIONAL STANDARD NORME INTERNATIONALE Optical amplifiers Test methods Part 4-2: Gain transient parameters Broadband source method Amplificateurs optiques Mthodes dessai Partie 4-2: Paramtres de gain transitoire Mthode par source large bande IEC 61290-4-2:2011
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16、du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 61290-4-2 Edition 1.0 2011-07 INTERNATIONAL STANDARD NORME INTERNATIONALE Optical amplifiers Test methods Part 4-2: Gain transient parameters Broadband source method Amplificateurs optiques Mthodes
17、 dessai Partie 4-2: Paramtres de gain transitoire Mthode par source large bande INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE R ICS 33.180.30 PRICE CODE CODE PRIX ISBN 978-2-88912-573-9 Registered trademark of the International Electrotechnical Commission Marqu
18、e dpose de la Commission Electrotechnique Internationale colour inside 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 Apparat
19、us . 10 5 Test sample 12 6 Procedure . 12 7 Calculations 13 8 Test results 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 Figur
20、e 2 OFA transient gain response for (a) a channel removal event, and (b) 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 diff
21、erent types of saturating signals 16 Table 1 Examples of “add” and “drop” 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 Pa
22、rt 4-2: Gain transient parameters Broadband source 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-op
23、eration 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
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29、endent 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 l
30、iability 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 (i
31、ncluding 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
32、 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 61290-4-2 has been prepared by subcommitte
33、e 86C: Fibre optic systems and active devices, of IEC technical committee 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
34、cited above. Titles of existing standards in this series will be updated 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
35、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. 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
36、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
37、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. 61290-4-2 IEC:2011 5 INTR
38、ODUCTION This part of IEC 61290-4 is devoted to the subject of optical amplifiers. 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
39、 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. 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
40、61290-4 applies to optical amplifiers (OAs) and optically amplified elementary 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 ind
41、icated in IEC 61291-1. The object of this part of IEC 61290-4 is to establish 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 broadba
42、nd source method is different from the two-wavelength method described in 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). Thu
43、s, this method may be relevant to the characterization of transient events 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 reference
44、s 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 61290-4-1:2011, Optical amplifiers Test met
45、hods Part 4-1: Gain transient parameters Two wavelength method IEC 61291-1, 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 exhib
46、it 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
47、 the DWDM channels within the specified transmission band are dropped or 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 start Time Channel addition end 10 % of
48、change 100 % of change 90 % of change Input power to EDFA (linear a.u.) Rise time (a)Channel removal start Channel removal end 10 % of change 100 % of change 90 % of change Fall time Input power to EDFA (linear a.u.) (b) TimeFigure 1 Definitions of rise and fall times for (a) a channel addition even
49、t, and (b) a channel removal event The parameters generally used to characterize the transient gain 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-ex
