1、Optical amplifiers Testmethods Part 10-2: Multichannel parameters Pulse method using a gated optical spectrum analyzerBS EN 61290-10-2: 2009raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI British StandardsNational forewordThis British Standard is
2、the UK implementation of EN 61290-10-2:2008. It isidentical to IEC 61290-10-2:2007. It supersedes BS EN 61290-10-2:2003which is withdrawn.The UK participation in its preparation was entrusted by Technical CommitteeGEL/86, Fibre optics, to Subcommittee GEL/86/3, Fibre optic systems andactive devices.
3、A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2009ISBN 978 0 580 57784 0ICS 33.180.30BRITISH STANDARDBS EN
4、 61290-10-2:2008Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on Amendments issued since publicationAmd. No. Date Text affectedMarch 200931EUROPEAN STANDARD EN 6129
5、0-10-2 NORME EUROPENNE EUROPISCHE NORM January 2008 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2008 CENELEC - All rights of
6、 exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61290-10-2:2008 E ICS 33.180.30 Supersedes EN 61290-10-2:2003English version Optical amplifiers - Test methods - Part 10-2: Multichannel parameters - Pulse method using a gated optical spectrum analyzer (I
7、EC 61290-10-2:2007) Amplificateurs optiques - Mthodes dessai - Partie 10-2: Paramtres canaux multiples - Mthode dimpulsion utilisant un analyseur de spectre optique stroboscopique (CEI 61290-10-2:2007) Prfverfahren fr Lichtwellenleiter-Verstrker - Teil 10-2: Mehrkanalparameter - Pulsmethode bei Verw
8、endung eines ausblendbaren optischen Spektralanalysators (IEC 61290-10-2:2007) This European Standard was approved by CENELEC on 2007-10-01. 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
9、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 versi
10、on 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, Cyprus, th
11、e 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. EN 61290-10-2:2008 - 2 - Foreword T
12、he text of document 86C/772/FDIS, future edition 2 of IEC 61290-10-2, 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 was approved by CENELEC as EN 61290-10-2 on 2007-10-01. This European Standard supersedes E
13、N 61290-10-2:2003. EN 61290-10-2:2008 is a technical revision with updated references and cautions on proper use of the procedure. This standard is to be used in conjunction with EN 61291-1. The following dates were fixed: latest date by which the EN has to be implemented at national level by public
14、ation of an identical national standard or by endorsement (dop) 2008-08-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2010-10-01 The International Electrotechnical Commission (IEC) and CENELEC draw attention to the fact that it is claimed that comp
15、liance 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 the presence of an optical signal given in Clause 4 and Clause 6. The IEC and CENELEC take no position concerning the evid
16、ence, validity and scope of this patent right. The holder of this patent right has assured the IEC that he/she is willing to negotiate licences under reasonable and non-discriminatory terms and conditions with applicants throughout the world. In this respect, the statement of the holder of this pate
17、nt 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 an optical amplifier given in Clause 4 and Clause 6. The IEC and CENELEC take no position concerning the evi
18、dence, validity and scope of this patent right. The holder of this patent right has assured the IEC that he/she is willing to negotiate licences under reasonable and non-discriminatory terms and conditions with applicants throughout the world. In this respect, the statement of the holder of this pat
19、ent right is registered with the IEC. Information may be obtained from: Fujitsu Limited Tokyo Japan Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights other than those identified above. The IEC and CENELEC shall not be held responsibl
20、e for identifying any or all such patent rights. Annex ZA has been added by CENELEC. _ BS EN 61290-10-2:2008- 3 - EN 61290-10-2:2008 Endorsement notice The text of the International Standard IEC 61290-10-2:2007 was approved by CENELEC as a European Standard without any modification. In the official
21、version, for Bibliography, the following notes have to be added for the standards indicated: IEC 61290-3-1 NOTE Harmonized as EN 61290-3-1:2003 (not modified). IEC 61290-10-1 NOTE Harmonized as EN 61290-10-1:2003 (not modified). _ BS EN 61290-10-2:2008EN 61290-10-2:2008 - 4 - Annex ZA (normative) No
22、rmative 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 reference
23、d 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 - 1)Optical amplifiers - Part 1: Generic specification EN 61291-1 2006 2)1) U
24、ndated reference. 2)Valid edition at date of issue. BS EN 61290-10-2:2008 2 61290-10-2 IEC:2007 CONTENTS 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
25、 noise measurement.10 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 D
26、irectly modulated source 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 BS EN
27、 61290-10-2:200861290-10-2 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 abbreviation
28、 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. BS EN 61290-10-2:2008 6 61290-10-2 IEC:2007 OPTICAL AMPLIFIERS TEST METHODS Part 10-2: Multichannel
29、 parameters 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
30、 requirements 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 mea
31、sured by synchronously 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, par
32、ticularly 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
33、required modulation 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
34、 with variable 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
35、due to non-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 powe
36、r increases, the gain recovery time constant becomes shorter, resulting in a larger deviation from the high-frequency value. For this particular amplifier, a modulation frequency above 20 kHz is required to give 0,1 dB error in measured gain at 500 mA pump current. 1,41,21,00,80,60,40,20110100 1000M
37、odulation frequency kHzGain recoveryerror dB100 mA200 mA500 mAIEC 2655/02Figure A.2 Gain recovery error versus modulation frequency with pump current as a parameter However, there are two situations that require careful consideration of modulation frequency. First, as indicated in Figure A.2, higher
38、 pump current shortens the recovery time. Secondly, in some situations it is necessary to test OFAs when automatic gain control (AGC) or automatic level control (ALC) circuitry is operational. The bandwidths of these AGC and ALC control loops will impose limitations on the modulation rate. It is rec
39、ommended that this test be performed to qualify the appropriate modulation rate for a particular amplifier design. NOTE In performing the above test, modulation rates below about 10 kHz should not be used. A large output power transient could destroy OFA or test system components.BS EN 61290-10-2:20
40、08 14 61290-10-2 IEC:2007 Bibliography IEC 61290-3-1, Optical amplifiers Test methods Part 3-1: Noise figure parameters Optical spectrum analyzer method IEC 61290-10-1, Optical amplifiers Test methods Part 10-1: Multichannel parameters Pulse method using an optical switch and optical spectrum analyz
41、er _ BS EN 61290-10-2:2008This page deliberately left blankThis page deliberately left blankBSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter.British Sta
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