1、BRITISH STANDARDBS EN 61290-10-4:2007Optical amplifiers Test methods Part 10-4: Multichannel parameters Interpolated source subtraction method using an optical spectrum analyzerThe European Standard EN 61290-10-4:2007 has the status of a British StandardICS 33.180.30g49g50g3g38g50g51g60g44g49g42g3g5
2、8g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 61290-10-4:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 Sep
3、tember 2007 BSI 2007ISBN 978 0 580 56242 6National forewordThis British Standard is the UK implementation of EN 61290-10-4:2007. It is identical to IEC 61290-10-4:2007.The UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/3, Fibre o
4、ptic systems and active devices.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Stand
5、ard cannot confer immunity from legal obligations. Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARD EN 61290-10-4 NORME EUROPENNE EUROPISCHE NORM July 2007 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europi
6、sches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61290-10-4:2007 E ICS 33.180.30 English version Optical amplifiers - Test m
7、ethods - Part 10-4: Multichannel parameters - Interpolated source subtraction method using an optical spectrum analyzer (IEC 61290-10-4:2007) Amplificateurs optiques - Mthodes dessais - Partie 10-4: Paramtres canaux multiples - Mthode par soustraction de la source interpole en utilisant un analyseur
8、 de spectre optique (CEI 61290-10-4:2007) Prfverfahren fr Lichtwellenleiter-Verstrker - Teil 10-4: Mehrkanal-Parameter - Quellen-Interpolations- und Subtraktionsverfahren unter Verwendung eines optischen Spektralanalysators (IEC 61290-10-4:2007) This European Standard was approved by CENELEC on 2007
9、-06-01. 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 such national standards may be o
10、btained 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 own language and notified to the C
11、entral 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, Italy, Latvia, Lithuania, Luxembourg
12、, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 61290-10-4:2007 2 Foreword The text of document 86C/724/CDV, future edition 1 of IEC 61290-10-4, prepared by SC 86C, Fibre optic systems and active devices, of IEC T
13、C 86, Fibre optics, was submitted to the IEC-CENELEC parallel Unique Acceptance Procedure and was approved by CENELEC as EN 61290-10-4 on 2007-06-01. This standard is to be used in conjunction with EN 61291-1:2006. The following dates were fixed: latest date by which the EN has to be implemented at
14、national level by publication of an identical national standard or by endorsement (dop) 2008-03-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2010-06-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard
15、 IEC 61290-10-4:2007 was approved by CENELEC as a European Standard without any modification. 3 EN 61290-10-4:2007 CONTENTS INTRODUCTION.4 1 Scope and object5 2 Normative references .5 3 Abbreviated terms 6 4 Apparatus.6 5 Test sample .7 6 Procedure 8 6.1 Calibration.8 6.1.1 Calibration of optical b
16、andwidth8 6.1.2 Calibration of OSA power correction factor .9 6.2 Measurement 10 6.3 Calculation 11 7 Test results 11 Annex A (normative) Limitations of the interpolated source subtraction technique due to source spontaneous emission .12 Annex ZA (normative) Normative references to international pub
17、lications with their corresponding European publications17 Bibliography .16 Figure 1 Apparatus for gain and noise figure measurement.6 Figure A.1 DI subtraction error as a function of source spontaneous emission level.13 Figure A.2 Spectral plot showing additive higher noise level from spontaneous e
18、mission of individual laser sources and broadband multiplexer.15 Figure A.3 Significantly reduced spontenous emmision using wavelength selective multiplexer15 EN 61290-10-4:2007 4 INTRODUCTION This International Standard is devoted to the subject of optical amplifiers. The technology of optical ampl
19、ifiers is still rapidly evolving, hence amendments and new additions to this standard can be expected. 5 EN 61290-10-4:2007 OPTICAL AMPLIFIERS TEST METHODS Part 10-4: Multichannel parameters Interpolated source subtraction method using an optical spectrum analyzer 1 Scope and object This part of IEC
20、 61290 applies to all commercially available optical amplifiers (OAs) and optically amplified subsystems. It applies to OAs using optically pumped fibres (OFAs based on either rare-earth doped fibres or on the Raman effect), semiconductor optical amplifiers (SOAs) and waveguides (POWA). The object o
21、f this standard is to establish uniform requirements for accurate and reliable measurements, by means of the interpolated source subtraction method using an optical spectrum analyzer. The following OA parameters, as defined in Clause 3 of IEC 61291-1, are determined: channel gain, and channel signal
22、-spontaneous noise figure. This method is called interpolated source subtraction (ISS) because the amplified spontaneous emission (ASE) at each channel is obtained by interpolating from measurements at a small wavelength offset around each channel. To minimize the effect of source spontaneous emissi
23、on, the effect of source noise is subtracted from the measured noise. The accuracy of the ISS technique degrades at high input power level due to the spontaneous emission from the laser source(s). Annex A provides guidance on the limits of this technique for high input power. An additional source of
24、 inaccuracy is due to interpolation error. Annex A provides guidance on the magnitude of interpolation error for a typical amplifier ASE versus wavelength characteristic. NOTE 1 All numerical values followed by () are suggested values for which the measurement is assured. Other values may be accepta
25、ble but should be verified. NOTE 2 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,
26、 the latest edition of the referenced document (including any amendments) applies. IEC 61291-1:2006, Optical amplifiers Part 1: Generic specification IEC 61291-4: Optical amplifiers Part 4: Multichannel applications Performance specification template EN 61290-10-4:2007 6 3 Abbreviated terms Each abb
27、reviation 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, the following is a list of all abbreviations used in this standard: ASE Amplified spontaneous emission DI Direct interpolation (technique) FWHM F
28、ull-width half-maximum ISS Interpolated source subtraction NF Noise figure RBW Resolution bandwidth OA Optical amplifier OFA Optical fibre amplifier OSA Optical spectrum analyzer POWA Planar optical waveguide amplifier PCF Power correction factor SOA Semiconductor optical amplifier SSE Source sponta
29、neous emission 4 Apparatus 4.1 Multichannel source This optical source consists of n laser sources where n is the number of channels for the test configuration. The full width at half maximum (FWHM) of the output spectrum of the laser sources shall be narrower than 0,1 nm () so as not to cause any i
30、nterference to adjacent channels. The suppression ratio of the side modes of the single-line laser shall be higher than 35 dB (). The output power fluctuation shall be less than 0,05 dB (), which is more easily attainable with an optical isolator placed at the output port of each source. The wavelen
31、gth accuracy shall be better than 0,1 nm () with stability better than 0,01 nm (). The spontaneous emission level must be less than -43 dB/nm with respect to the total input power for 0 dBm total input power and less than -48 dB/nm with respect to the total input power for 5 dBm total input power ()
32、. See Annex A for a discussion of the impact of the spontaneous emission level on the accuracy of noise figure measurements. 1dB Polarization controller Variable optical attenuator OA under test Optical spectrum analyzer Multichannel source Calibration pathOpticalcombiner2nIEC 746/07 Figure 1 Appara
33、tus for gain and noise figure measurement 7 EN 61290-10-4:2007 4.2 Polarization controller This device shall be able to convert any state of polarization of a signal to any other state of polarization. The polarization controller may consist of an all-fibre polarization controller or a quarter-wave
34、plate rotatable by a minimum of 90 followed by a half-wave plate rotatable by a minimum of 180. The reflectance of this device shall be smaller than 50 dB () at each port. The insertion loss variation of this device shall be less than 0,2 dB (). The use of a polarization controller is considered opt
35、ional, but may be necessary to achieve the desired accuracy for OA devices exhibiting significant polarization dependent gain. 4.3 Variable optical attenuator The attenuation range and stability shall be over 40 dB () and better than 0,1 dB (), respectively. The reflectance from this device shall be
36、 smaller than 50 dB () at each port. The wavelength flatness over the full range of attenuation shall be less than 0,2 dB (). 4.4 Optical spectrum analyzer The optical spectrum analyzer (OSA) shall have polarization sensitivity less than 0,1 dB (), stability better than 0,1 dB (), and wavelength acc
37、uracy better than 0,05 nm (). The linearity should be better than 0,2 dB () over the device dynamic range. The reflectance from this device shall be smaller than 50 dB () at its input port. The OSA shall have sufficient dynamic range to measure the noise between channels. For 100 GHz (0,8 nm) channe
38、l spacing, the dynamic range shall be greater than 55 dB at 50 GHz (0,4 nm) from the signal. 4.5 Optical power meter This device shall have a measurement accuracy better than 0,2 dB (), irrespective of the state of polarization, within the operational wavelength bandwidth of the OA and within the po
39、wer range from 40 dBm to +20 dBm (). 4.6 Broadband optical source This device shall provide broadband optical power over the operational wavelength bandwidth of the OA (for example, 1 530 nm to 1 565 nm). The output spectrum shall be flat with less than a 0,1 dB () variation over the measurement ban
40、dwidth range (typically 10 nm). For example, the ASE generated by an OA with no signal applied could be used. 4.7 Optical connectors The connection loss repeatability shall be better than 0,1 dB (). The reflectance from this device shall be smaller than 50 dB (). 4.8 Optical fibre jumpers The mode f
41、ield diameter of the optical fibre jumpers shall be as close as possible to that of the fibres used as input and output ports of the OA. The reflectance from this device shall be smaller than 50 dB (), and the device length shall be short (0,1 dB). The wavelength-selective multiplexed source (Figure
42、 A.3) provides a minimum of 60 dB/nm signal-to-spontaneous emission ratio on a per channel basis. Such a spectrum can be used up to +16 dBm total input power before the subtraction error is excessive. 15 EN 61290-10-4:2007 0 5 1 524,8 1 525 1 525,2 1 525,4 1 525,6 1 525,8 1 526 Wavelength (nm)5 10 1
43、5 20 25 30 35 40 45 dB IEC 748/07 Figure A.2 Spectral plot showing additive higher noise level from spontaneous emission of individual laser sources and broadband multiplexer 0 10203040506070801 535 1 540 1 545 1 550 1 555 1 560 1 565 Wavelength (nm) dBIEC 749/07 Figure A.3 Significantly reduced spo
44、ntenous emmision using wavelength selective multiplexer EN 61290-10-4:2007 16 Bibliography IEC 61931: Fibre optic Terminology IEC 61290-1-1: Optical amplifiers Test methods Part 1-1: Power and gain parameters Optical spectrum analyzer method Harmonized as EN 61290-1-1:2006 (not modified). IEC 61290-
45、3: Optical fibre amplifiers Basic specification Part 3: Test methods for noise figure parameters1Harmonized as EN 61290-3:2000 (not modified). _ 1A future edition is in preparation. 17 EN 61290-10-4:2007 Annex ZA (normative) Normative references to international publications with their corresponding
46、 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 referenced document (including any amendments) applies. NOTE When an international
47、 publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 61291-1 2006 Optical amplifiers - Part 1: Generic specification EN 61291-1 2006 IEC 61291-4 -1)Optical amplifiers - Part 4: Multichannel applications - Perfor
48、mance specification template EN 61291-4 20032)1)Undated reference. 2)Valid edition at date of issue. BS EN 61290-10-4:2007BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on
49、 standards in Europe and at the international level. It is incorporated by Royal Charter.RevisionsBritish Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions.It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while
