1、Optical amplifiers Testmethods Part 10-2: Multichannel parameters Pulse method using a gated optical spectrum analyzerBS EN 61290-10-2:2008raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI British StandardsLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA
2、 STANDARDS, 18/06/2009 08:29, Uncontrolled Copy, (c) BSINational forewordThis British Standard is 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 It supersedes BS EN 61290-10-2:2003which is withdrawn.The UK participation in its preparation was entrusted by Technic
3、al CommitteeGEL/86, Fibre optics, to Subcommittee GEL/86/3, Fibre optic systems andactive devices.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 respons
4、ible for its correct application. BSI 2009ISBN 978 0 580 57784 0ICS 33.180.30BRITISH STANDARDBS EN 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 3
5、1 March 2009 Amendments issued since publicationAmd. No. Date Text affectedLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/06/2009 08:29, Uncontrolled Copy, (c) BSIEUROPEAN STANDARD EN 61290-10-2 NORME EUROPENNE EUROPISCHE NORM January 2008 CENELEC European Committee for Electrotechnical S
6、tandardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61290-
7、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 (IEC 61290-10-2:2007) Amplificateurs optiques - Mthodes dessai - Partie 10-2: Paramtres canaux multiple
8、s - Mthode dimpulsion utilisant un analyseur de spectre optique stroboscopique (CEI 61290-10-2:2007) Prfverfahren fr Lichtwellenleiter-Verstrker - Teil 10-2: Mehrkanalparameter - Pulsmethode bei Verwendung eines ausblendbaren optischen Spektralanalysators (IEC 61290-10-2:2007) This European Standard
9、 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 national standard without any alteration. Up-to-date lists and bibliographical references concerning
10、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 ow
11、n 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, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Ital
12、y, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/06/2009 08:29, Uncontrolled Copy, (c) BSIEN 61290-10-2:2008 - 2 - Foreword The
13、 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 EN
14、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 publicat
15、ion 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 compli
16、ance 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 eviden
17、ce, 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 patent
18、 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 evide
19、nce, 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 paten
20、t 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 responsible
21、for identifying any or all such patent rights. Annex ZA has been added by CENELEC. _ BS EN 61290-10-2:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/06/2009 08:29, Uncontrolled Copy, (c) BSI- 3 - EN 61290-10-2:2008 Endorsement notice The text of the International Standard IEC 61290-10
22、-2:2007 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 61290-3-1 NOTE Harmonized as EN 61290-3-1:2003 (not modified). IEC 61290-10-1 NOTE Harmonized as EN 61290-
23、10-1:2003 (not modified). _ BS EN 61290-10-2:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/06/2009 08:29, Uncontrolled Copy, (c) BSIEN 61290-10-2:2008 - 4 - Annex ZA (normative) Normative references to international publications with their corresponding European publications The foll
24、owing 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
25、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) Undated reference. 2)Valid edition at date of issue. BS EN 61290-10-2:2008Licensed Copy: Wang Bin, ISO/EX
26、CHANGE CHINA STANDARDS, 18/06/2009 08:29, Uncontrolled Copy, (c) BSI 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 nois
27、e 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 Direct
28、ly 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 6129
29、0-10-2:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/06/2009 08:29, Uncontrolled Copy, (c) BSI61290-10-2 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 evol
30、ving, hence amendments and new editions to this document should 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 is given in Clause 3. BS EN
31、 61290-10-2:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/06/2009 08:29, Uncontrolled Copy, (c) BSI 6 61290-10-2 IEC:2007 OPTICAL AMPLIFIERS TEST METHODS Part 10-2: Multichannel parameters Pulse method using a gated optical spectrum analyzer 1 Scope and object This part of IEC 61290
32、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 requirements for accurate and reliable measurements of the signal-spontaneous noise figure as defined in I
33、EC 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 synchronously measuring the power on an optical spectrum analyzer (OSA) during the optical pulse o
34、ff 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 in Er-doped OFA. However, since the OFA gain dynamics vary with amplifier types, operating condit
35、ions, 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 modulation frequency to limit the error to 100 s for Er-doped fibre amplifiers. Currently, the gai
36、n 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 variable modulation frequency is applied to the OFA. The average output power of the OFA is measured
37、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-linear gain recovery of the OFA. Pulse modulatedoptical sourceOFAOptical powermeterIEC 2654/02Fi
38、gure 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 deviation from the high
39、-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 1000Modulation frequency kHzGain recoveryerror dB100 mA200 mA500 mAIEC 2655/02Figure A.2 Gain recovery error ver
40、sus 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 pump current shortens the recovery time. Secondly, in some situations it is necessary to test OFAs when au
41、tomatic 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 recommended that this test be performed to qualify the appropriate modulation rate for a particular amplifier
42、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 61290-10-2:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/06/2009 08:29, Uncontrolled Copy, (c) BSI 14 61
43、290-10-2 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 analyzer _ BS
44、EN 61290-10-2:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/06/2009 08:29, Uncontrolled Copy, (c) BSIThis page deliberately left blankLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/06/2009 08:29, Uncontrolled Copy, (c) BSIThis page deliberately left blankLicensed Copy: Wan
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