1、 IEC 61290-10-2Edition 2.0 2007-09INTERNATIONAL STANDARD NORME INTERNATIONALEOptical amplifiers Test methods Part 10-2: Multichannel parameters Pulse method using a gated optical spectrum analyzer Amplificateurs optiques Mthodes dessai Partie 10-2: Paramtres canaux multiples Mthode dimpulsion utilis
2、ant un analyseur de spectre optique stroboscopique IEC61290-10-2:2007 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2007 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or
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16、lication ou si vous avez des questions, visitez le FAQ du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 61290-10-2Edition 2.0 2007-09INTERNATIONAL STANDARD NORME INTERNATIONALEOptical amplifiers Test methods Part 10-2: Multichannel parameters Pul
17、se method using a gated optical spectrum analyzer Amplificateurs optiques Mthodes dessai Partie 10-2: Paramtres canaux multiples Mthode dimpulsion utilisant un analyseur de spectre optique stroboscopique INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE NICS 33.180
18、.30 PRICE CODECODE PRIXISBN 2-8318-9311-9 2 61290-10-2 IEC:2007 CONTENTS FOREWORD.3 INTRODUCTION.5 1 Scope and object6 2 Normative references .6 3 Symbols and abbreviated terms7 4 Apparatus.7 5 Test sample10 6 Procedure 10 6.1 General .10 6.2 Calibration.10 6.3 Output signal and noise measurement.10
19、 7 Calculations .11 8 Test results 12 Annex A (informative) Pulse repetition frequency measurements .13 Bibliography14 Figure 1 Test apparatus for signal-spontaneous noise figure parameter measurement Typical arrangement 8 Figure 2a Optically switched source module 8 Figure 2b Directly modulated sou
20、rce module9 Figure 2 Two arrangements of the optical pulse source module .9 Figure 3 Timing diagram 11 Figure A.1 Set-up to evaluate gain recovery error versus modulation rate13 Figure A.2 Gain recovery error versus modulation frequency with pump current as a parameter .13 61290-10-2 IEC:2007 3 INTE
21、RNATIONAL ELECTROTECHNICAL COMMISSION _ OPTICAL AMPLIFIERS TEST METHODS Part 10-2: Multichannel parameters Pulse method using a gated optical spectrum analyzer FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national elec
22、trotechnical 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 Specifi
23、cations, 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. Internatio
24、nal, 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 d
25、ecisions 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 in
26、ternational 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
27、 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
28、 clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability
29、 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
30、 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
31、 publication. The International Electrotechnical Commission (IEC) draws attention to the fact that it is claimed that compliance with this document may involve the use of two patents. One patent concerns a technique for determining the amplified spontaneous emission noise of an optical amplifier in
32、the presence of an optical signal given in Clause 4 and Clause 6. IEC takes no position concerning the evidence, validity and scope of this patent right. The holder of this patent right has assured the IEC that he/she is willing to negotiate licenses under reasonable and non-discriminatory terms and
33、 conditions with applicants throughout the world. In this respect, the statement of the holder of this patent right is registered with the IEC. Information may be obtained from: Agilent Technologies Palo Alto (CA) USA Another patent concerns a measurement system and noise measurement apparatus for a
34、n optical amplifier given in Clause 4 and Clause 6. IEC takes no position concerning the evidence, validity and scope of this patent right. The holder of this patent right has assured the IEC that he/she is willing to negotiate licenses under reasonable and non-discriminatory terms and conditions wi
35、th applicants throughout the world. In this respect, the statement of the holder of this patent right is registered with the IEC. Information may be obtained from: Fujitsu Limited Tokyo Japan 4 61290-10-2 IEC:2007 Attention is drawn to the possibility that some of the elements of this International
36、Standard may be the subject of patent rights other than those identified above. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61290-10-2 has been prepared by subcommittee 86C: Fibre optic systems and active devices, of IEC technical commi
37、ttee 86: Fibre optics. This second edition cancels and replaces the first edition published in 2003. It is a technical revision with updated references and cautions on proper use of the procedure. This standard is to be read in conjunction with IEC 61291-1. The text of this standard is based on the
38、following documents: FDIS Report on voting 86C/772/FDIS 86C/787/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. A list of all p
39、arts of the IEC 61290 series, published under the general title Optical amplifiers Test methods:1)can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/websto
40、re.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. 1)The first editions of some of these parts were published under the general title Optical fibre amplifiers Basic specification or Opti
41、cal amplifier test methods. 61290-10-2 IEC:2007 5 INTRODUCTION As far as can be determined, this part of IEC 61290 is the first International Standard on this subject. The technology of optical amplifiers is still evolving, hence amendments and new editions to this document should be expected. Each
42、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 is given in Clause 3. 6 61290-10-2 IEC:2007 OPTICAL AMPLIFIERS TEST METHODS Part 10-2: Multichannel parameter
43、s Pulse method using a gated optical spectrum analyzer 1 Scope and object This part of IEC 61290 applies to optical fibre amplifiers (OFA) using active fibres, containing rare-earth dopants, currently commercially available. The object of this International Standard is to establish uniform requireme
44、nts for accurate and reliable measurements of the signal-spontaneous noise figure as defined in IEC 61291-1. The test method independently detects amplified signal power and amplified spontaneous emission (ASE) power by launching optical pulses into the OFA under test. The ASE level is measured by s
45、ynchronously measuring the power on an optical spectrum analyzer (OSA) during the optical pulse off period. The average optical signal level is measured by random sampling in the OSA. Such measurement is possible because the gain response of the rare-earth doped OFA is relatively slow, particularly
46、in Er-doped OFA. However, since the OFA gain dynamics vary with amplifier types, operating conditions, and control schemes, the gain dynamics should be carefully considered when applying the present test method to various OFA. The manufacturer of the OFA should present data validating the required m
47、odulation frequency to limit the error to 100 s for Er-doped fibre amplifiers. Currently, the gain recovery times allow pulse repetition rates in the 25 kHz to 100 kHz range. A simple set-up to evaluate OFA gain response versus modulation frequency is shown in Figure A.1. An optical source with vari
48、able modulation frequency is applied to the OFA. The average output power of the OFA is measured on an optical power meter. As the modulation frequency is increased, the power meter reading asymptotically approaches a final value. At low modulation frequencies there is an increasing error due to non
49、-linear gain recovery of the OFA. Pulse modulatedoptical sourceOFAOptical powermeterIEC 2654/02Figure A.1 Set-up to evaluate gain recovery error versus modulation rate Figure A.2 shows a measurement on a 980 nm pumped Er-doped fibre amplifier with three values of pump current. As pump power increases, the gain recovery time constant becomes shorter, resulting in a larger de
