1、Optical amplifiers Testmethods Part 3-2: Noise figure parameters Electricalspectrum analyzer methodBS EN 61290-3-2:2008raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI British StandardsLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 17/06/20
2、09 04:19, Uncontrolled Copy, (c) BSINational forewordThis British Standard is the UK implementation of EN 61290-3-2:2008. It isidentical to IEC 61290-3-2:2008. It supersedes BS EN 61290-3-2:2003 whichis withdrawn.The UK participation in its preparation was entrusted by Technical CommitteeGEL/86, Fib
3、re 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 responsible for its correct ap
4、plication. BSI 2009ISBN 978 0 580 62671 5ICS 33.180.30BRITISH STANDARDBS EN 61290-3-2:2008Compliance 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 p
5、ublicationAmd. No. Date Text affectedMarch 200931Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 17/06/2009 04:19, Uncontrolled Copy, (c) BSIEUROPEAN STANDARD EN 61290-3-2 NORME EUROPENNE EUROPISCHE NORM October 2008 CENELEC European Committee for Electrotechnical Standardization Comit Europe
6、n 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 61290-3-2:2008 E ICS 33.180.30 Su
7、persedes EN 61290-3-2:2003English version Optical amplifiers - Test methods - Part 3-2: Noise figure parameters - Electrical spectrum analyzer method (IEC 61290-3-2:2008) Amplificateurs optiques - Mthodes dessais - Partie 3-2: Paramtres du facteur de bruit - Mthode de lanalyseur spectral lectrique (
8、CEI 61290-3-2:2008) Lichtwellenleiter-Verstrker - Prfverfahren - Teil 3-2: Rauschzahlparameter - Verfahren mit elektrischem Spektralanalysator (IEC 61290-3-2:2008) This European Standard was approved by CENELEC on 2008-10-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulati
9、ons 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 such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This E
10、uropean 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 own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members a
11、re the national electrotechnical committees of Austria, Belgium, Bulgaria, 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, S
12、pain, Sweden, Switzerland and the United Kingdom. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 17/06/2009 04:19, Uncontrolled Copy, (c) BSIEN 61290-3-2:2008 - 2 - Foreword The text of document 86C/784/CDV, future edition 2 of IEC 61290-3-2, prepared by SC 86C, Fibre optic systems and activ
13、e devices, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61290-3-2 on 2008-10-01. This European Standard supersedes EN 61290-3-2:2003. EN 61290-3-2:2008 includes updates to specifically address all types of optical amplifiers, not just o
14、ptical fibre amplifiers. This standard is to be used in conjunction with EN 61290-3 and EN 61291-1. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2009-07-01 latest date by w
15、hich the national standards conflicting with the EN have to be withdrawn (dow) 2011-10-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 61290-3-2:2008 was approved by CENELEC as a European Standard without any modification. In the official versio
16、n, for Bibliography, the following notes have to be added for the standards indicated: IEC 60793 NOTE Harmonized in EN 60793 series (modified). IEC 60825-1 NOTE Harmonized as EN 60825-1:2007 (not modified). IEC 60825-2 NOTE Harmonized as EN 60825-2:2004 (not modified). IEC 60874-1 NOTE Harmonized as
17、 EN 60874-1:2007 (not modified). _ BS EN 61290-3-2:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 17/06/2009 04:19, Uncontrolled Copy, (c) BSI- 3 - EN 61290-3-2:2008 Annex ZA (normative) Normative references to international publications with their corresponding European publications The
18、 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. NOTE When an international publication has been modi
19、fied by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60728-6 -1)Cable networks for television signals, sound signals and interactive services - Part 6: Optical equipment EN 60728-6 20032)IEC 61290-3 -1)Optical amplifiers - Test methods -
20、 Part 3: Noise figure parameters EN 61290-3 20082)IEC 61291-1 -1)Optical amplifiers - Part 1: Generic specification EN 61291-1 20062)1)Undated reference. 2)Valid edition at date of issue. BS EN 61290-3-2:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 17/06/2009 04:19, Uncontrolled Copy,
21、(c) BSI 2 61290-3-2 IEC:2008 CONTENTS INTRODUCTION.5 1 Scope and object6 2 Normative references .6 3 Symbols, acronyms and abbreviations7 4 Apparatus.8 5 Test specimen 10 6 Procedure 10 6.1 Frequency-scanning technique: calibration11 6.2 Frequency-scanning technique: measurement.12 6.3 Selected-freq
22、uency technique: calibration and measurement 13 6.4 Measurement accuracy limitations.13 7 Calculation .14 7.1 Calculation of calibration results14 7.2 Calculation of test results for the frequency-scanning technique15 7.3 Calculation of test results for the selected-frequency technique.15 8 Test res
23、ults 16 Bibliography17 Figure 1 Scheme of a measurement set-up 9 BS EN 61290-3-2:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 17/06/2009 04:19, Uncontrolled Copy, (c) BSI61290-3-2 IEC:2008 5 INTRODUCTION This part of IEC 61290 is devoted to the subject of optical amplifiers. The techno
24、logy of optical amplifiers is still rapidly evolving, hence amendments and new additions to this standard can be expected. Each symbol and abbreviation introduced in this standard is generally explained in the text the first time it appears. However, for an easier understanding of the whole text, a
25、list of all symbols and abbreviations used in this standard is given in Clause 3. BS EN 61290-3-2:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 17/06/2009 04:19, Uncontrolled Copy, (c) BSI 6 61290-3-2 IEC:2008 OPTICAL AMPLIFIERS TEST METHODS Part 3-2: Noise figure parameters Electrical
26、spectrum analyzer method 1 Scope and object This part of IEC 61290 applies to all commercially available optical amplifiers (OAs), including OAs using optically pumped fibres (OFAs based on either rare-earth doped fibres or on the Raman effect), semiconductor optical amplifiers (SOAs) and planar wav
27、eguide optical amplifiers (PWOAs). The object of this standard is to establish uniform requirements for accurate and reliable measurements, by means of the electrical spectrum analyzer (ESA) method, of the noise figure, as defined in IEC 61291-1. The present test method is based on direct electrical
28、 noise measurement and it is directly related to its definition including all relevant noise contributions. Therefore, this method can be used for all types of optical amplifiers, including SOA and Raman amplifiers which can have significant contributions besides amplified spontaneous emission, beca
29、use it measures the total noise figure. For further details of applicability, see IEC 61290-3. An alternative test method based on the optical spectrum analyzer can be used, particularly for different noise parameters (such as the signal-spontaneous noise factor) but it is not included in the object
30、 of this standard. NOTE 1 All numerical values followed by () are suggested values for which the measurement is assured. Other values may be acceptable but should be verified. NOTE 2 A measurement accuracy for the average noise factor of 20 %(), respectively 1 dB, should be attainable with this meth
31、od (see Clause 6). NOTE 3 General aspects of noise figure test methods are reported in IEC 61290-3. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the late
32、st edition of the referenced document (including any amendments) applies. IEC 60728-6, Cable networks for television signals, sound signals and interactive services Part 6: Optical equipment IEC 61290-3: Optical fibre amplifiers Basic specification Part 3: Test methods for noise figure parameters1IE
33、C 61291-1, Optical amplifiers Part 1: Generic specification NOTE A list of informative references is given in the bibliography. _ 1The first editions of some of these parts were published under the general title Optical fibre amplifiers Basic specification or Optical amplifiers Test methods. Future
34、editions of these parts will appear under the new general title listed above. The individual titles of Parts 1-1, 3-1, 5-2, 10-1, 10-2, 10-3, 11-1 and 11-2 will be updated in future editions of these parts to reflect the overall structure of the series. BS EN 61290-3-2:2008Licensed Copy: Wang Bin, I
35、SO/EXCHANGE CHINA STANDARDS, 17/06/2009 04:19, Uncontrolled Copy, (c) BSI61290-3-2 IEC:2008 7 3 Symbols, acronyms and abbreviations For the purposes of this document, the following symbols, acronyms and abbreviations apply. Becalibrated, noise equivalent ESA electrical bandwidth (not necessarily the
36、 resolution bandwidth) c speed of light in vacuum e electron charge f baseband frequency F (total) noise factor Fnon-mpi, frequency-independent contribution to total noise factor Fmpinoise factor contribution from multiple path interference noise (OA internal reflections) G OA optical signal gain h
37、Plancks constant k optical power reduction factor (default k = 0,5); it can be obtained by taking the square root of the electrical power reduction factor optical frequency = c/ source FWHM linewidth with modulation on H0, H0(f) Sesa/Pin2= transfer function of receiver in watts1Impimulti-path interf
38、erence figure of merit, the noise factor contribution caused by multiple path interference integrated over all baseband frequencies (0 to infinity); Ipdphotodetector current wavelength in vacuum m relative modulation amplitude (the ratio of RMS optical power modulation amplitude to average optical p
39、ower) NF(f) (total) noise figure Nrin,0(f) (frequency-dependent) ESA noise contribution caused by the laser relative intensity noise, at calibration conditions Nrin,1(frequency-dependent) noise caused by the laser relative intensity noise (RIN), measured with ESA Nshot,0(frequency-independent) shot
40、noise caused by the optical input power, at calibration conditions, measured with ESA Nthermalthermal noise level as measured with ESA (optical input port of receiver module closed); N0(f) (frequency-dependent) noise power measured with ESA with input and output attenuator set to 0 dB, thermal noise
41、 level subtracted, without OA test device N0(f) (frequency-dependent) noise power measured with ESA with input attenuator set to 3 dB (default) and output attenuator set to 0 dB, thermal noise level subtracted, without OA test device N1(f) frequency-dependent noise power, with OA inserted, thermal n
42、oise level subtracted, measured with ESA Pintime-averaged optical input power = TinPin,0(with modulation on); optical power radiated from the end of the input jumper cable Pin, 0time-averaged optical input power at 0 dB setting of input attenuator (with modulation on) Pin, rmsRMS optical power ampli
43、tude Pouttotal optical power radiated from the output port of the OA, including the ASE BS EN 61290-3-2:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 17/06/2009 04:19, Uncontrolled Copy, (c) BSI 8 61290-3-2 IEC:2008 r0, r0(f) effective photodetector responsivity through output attenuato
44、r at 0 dB setting RINsource(f) source relative intensity noise; generally, the square of the RMS optical power fluctuation divided by the (baseband) bandwidth and the square of the CW power S0electrical power of the modulation signal at Tin= 1, measured with ESA, without OA inserted S1electrical pow
45、er of the modulation signal, with OA inserted, measured with ESA Tintransmission factor of input attenuator relative to transmission at 0 dB setting, expressed in linear form Touttransmission factor of output attenuator relative to transmission at 0 dB setting, expressed in linear form Txvoltage amp
46、lification between detector output and ESA input; this quantity usually depends on the baseband frequency CW continuous wave DFB distributed feedback laser ESA electrical spectrum analyzer FWHM full width at half maximum MPI multiple path interference OA optical fibre amplifier RIN relative intensit
47、y noise of the source, expressed in Hz1RMS root mean square 4 Apparatus The scheme of a possible implementation of the measurement set-up is shown in Figure 1. The test equipment listed below, with the required characteristics, is needed. a) A source module with the following components 1) A laser s
48、ource with a single-line spectrum, for example: a distributed feedback (DFB) laser diode. The laser source shall be sine-wave amplitude modulated with one single frequency that is sufficiently higher than the linewidth of the source. A modulation frequency at least 3 times higher than the linewidth
49、is advisable. The relative modulation amplitude, m (that is, the ratio of root mean square, RMS, optical power modulation amplitude to average optical power) shall be sufficiently small to ensure operation in the linear regime. A value for m of 2 % to 10 %() is considered adequate. Direct or external modulation can be used. An achievable average output power, Pin, 0, of not less than 0 dBm is advisable, to be able to generate the desired OA saturation
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