1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Optical spectrum analyzer methodThe European Standard EN 61290-5-1:2006 has the status of a British
2、 StandardICS 33.180.30Optical amplifiers Test methods Part 5-1: Reflectance parameters BRITISH STANDARDBS EN 61290-5-1:2006BS EN 61290-5-1:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 September 2006 BSI 2006ISBN 0 580 49157 9Amendme
3、nts issued since publicationAmd. No. Date Commentsits 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 Standard cannot confer immunity from legal obligations.National forewor
4、dThis British Standard was published by BSI. It is the UK implementation of EN 61290-5-1:2006. It is identical with IEC 61290-5-1:2006. It supersedes BS EN 61290-5-1:2000 which is withdrawn.The UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommi
5、ttee GEL/86/3, Fibre optic systems and active devices. A list of organizations represented on GEL/86/3 can be obtained on request to EUROPEAN STANDARD EN 61290-5-1 NORME EUROPENNE EUROPISCHE NORM July 2006 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation
6、 Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61290-5-1:2006 E ICS 33.180.30 Supersedes EN 61290-
7、5-1:2000English version Optical amplifiers - Test methods Part 5-1: Reflectance parameters - Optical spectrum analyzer method (IEC 61290-5-1:2006) Amplificateurs optiques - Mthodes dessais Partie 5-1: Paramtres de rflectance - Mthode danalyseur de spectre optique (CEI 61290-5-1:2006) Lichtwellenleit
8、er-Verstrker -Prfverfahren Teil 5-1: Reflexionsparameter - Verfahren mit optischem Spektralanalysator (IEC 61290-5-1:2006) This European Standard was approved by CENELEC on 2006-06-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for gi
9、ving 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 European Standard exists in three official
10、 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 are the national electrotechnical committe
11、es of Austria, Belgium, 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, Spain, Sweden, Switzerland and the United Kingdom. F
12、oreword The text of document 86C/697/FDIS, future edition 2 of IEC 61290-5-1, 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 61290-5-1 on 2006-06-01. This European Standard super
13、sedes EN 61290-5-1:2000. The applicability of the standard has been extended to all commercially available optical amplifiers - not just optical fiber amplifiers. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical nation
14、al standard or by endorsement (dop) 2007-03-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2009-06-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 61290-5-1:2006 was approved by CENELEC as a Eur
15、opean Standard without any modification. _ EN 61290-5-1:2006 2 CONTENTS 1 Scope and object5 2 Normative references .5 3 Acronyms and abbreviations.5 4 Apparatus 5 5 Test sample .7 6 Procedure 7 6.1 Maximum and minimum input reflectance.7 6.1.1 Calibration.8 6.1.2 OA reflectance measurement .9 6.2 Ou
16、tput reflectance.9 7 Calculation .9 7.1 Maximum and minimum input reflectance.9 7.2 Output reflectance.9 8 Test results 9 8.1 Maximum and minimum input reflectance.9 8.2 Figure 1 Typical arrangement of the optical spectrum analyzer test apparatus for input reflectance.6 Figure 2 Set-up for insertion
17、 loss measurement of optical coupler and isolator .7 Figure 3 Set-up for OA input power measurements.8 Annex ZA (normative) Normative references to international publications with their corresponding European publications Output reflectance.10 11EN 61290-5-1:2006 3 Introduction.4 INTRODUCTION As far
18、 as can be determined, this is the first International Standard on this subject. The technology of optical fibre amplifiers is quite new and still emerging, hence amendments to and new editions of this standard can be expected. Each abbreviation introduced in this standard is explained in the text a
19、t least the first time it appears. However, for an easier understanding of the whole text, a list of all abbreviations used in this standard is given in Clause 3. EN 61290-5-1:2006 4 OPTICAL AMPLIFIERS TEST METHODS Part 5-1: Reflectance parameters Optical spectrum analyzer method 1 Scope and object
20、This part of IEC 61290 applies to all commercially available optical amplifiers (OAs) and optically amplified sub-systems. It applies to OAs using optically pumped fibres (OFAs based on either rare-earth doped fibres or on the Raman effect), semiconductor OAs (SOAs), and waveguides (POWAs) The objec
21、t of this standard is to establish uniform requirements for accurate and reliable measurements, by means of the optical spectrum analyzer test method, of the following OA parameters, as defined in IEC 61291-1: a) maximum input reflectance; b) minimum input reflectance; c) output reflectance. NOTE 1
22、All numerical values followed by () are currently under consideration. NOTE 2 The reflectance test method described in this standard does not apply to distributed fibre Raman amplifiers. The evaluation of reflectance and return loss of the distributed fibre Raman amplifiers is under consideration. N
23、OTE 3 The choice of methods, either the optical spectrum analyzer test method or the electrical spectrum analyzer test method, can depend on equipment availability. Normally, similar results are anticipated from both techniques. 2 Normative references The following referenced documents are indispens
24、able 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. IEC 61291-1: Optical fibre amplifiers Part 1: Generic specification 3 Acronyms and abbreviations
25、ASE amplified spontaneous emission DFB distributed feed-back (laser diode) OA optical amplifier OFA optical fibre amplifier 4 Apparatus A scheme of the measurement set-up is given in Figure 1. The test equipments listed below, with the required characteristics, are needed. EN 61290-5-1:2006 5 The po
26、larization-dependent loss variation of each optical passive component listed below shall be better than 0,2 dB (). a) Optical source: The optical source shall be either at fixed wavelength or wavelength-tuneable. It shall generate light at the wavelength specified in the relevant detail specificatio
27、n, and shall emit enough optical power to allow measurements of reflectance of 50 dB to 60 dB. The suppression ratio of side modes shall be higher than 30 dB(). An optical isolator with isolation greater than 40 dB shall be either integrated within the source package, or connected at the source outp
28、ut. The source shall be linearly polarized, in order to accomplish high precision measurements of amplified spontaneous emission (ASE) power within a narrow optical bandwidth. NOTE A DFB laser or an external cavity laser can be suitable optical sources. b) Optical coupler: A 3 dB, 2 2 optical couple
29、r is needed. It shall have an insertion loss lower than 3,5 dB () and a directivity not lower than 60 dB. Its input connectors shall have reflectance lower than 60 dB (). Its output connector shall be of the same type as the OA input connector. Its output unused port shall have a reflectance lower t
30、han 60 dB (). The polarization dependent loss of the optical coupler shall be less than 0,5 dB (). c) Optical power meter: This device is used for calibration purposes. It shall have a measurement accuracy better than 0,2 dB, a dependence of the state of polarization lower than 0,1 dB (), within the
31、 operational wavelength bandwidth of the OA. Its dynamic range shall exceed the range of reflectance to be measured. d) Optical spectrum analyzer: Its linearity and accuracy of spectral-power-measurement shall be better than 1,5 dB and 1 dB respectively, within the operational wavelength bandwidth o
32、f the OA. Polarization dependence of the spectral power measurement shall be better than 0,1 dB (). The spectral resolution shall be equal to or better than 0,1 nm. A dynamic range exceeding the range of reflectance to be measured is required. e) Optical isolator: Its optical isolation shall be bett
33、er than 60 dB (). The reflectance from this device shall be lower than 60 dB () at input port. f) Variable optical attenuator: Its attenuation range and accuracy shall be over 40 dB () and better than 0,1 dB (), respectively. The reflectance from this device shall be smaller than 50 dB () at each po
34、rt. The polarization dependence of the insertion loss of this device shall be better than 0,1 dB (). OPTICAL SPECTRUM ANALYZER dBOPTICAL SOURCE VARIABLE OPTICAL ATTENUATOR2 x 21234OPTICAL COUPLERTERMINATED PORTOATERMINATED PORT OPTICAL ISOLATORPOLARIZATION CONTROLLER IEC 307/2000 Figure 1 Typical ar
35、rangement of the optical spectrum analyzer test apparatus for input reflectance EN 61290-5-1:2006 6 g) Optical fibre jumpers: The mode field diameter of the used optical fibre jumpers should be as close as possible to that of fibres used as input and output ports of the OA. Their reflectance shall b
36、e lower than 40 dB () at each port, and the length of the jumper shall be shorter than 2 m. If the jumper is connected directly to the OA, the connector shall have the same characteristics as that of the OA port. h) Optical connectors: The connection loss repeatability of the optical connectors shal
37、l be better than 0,2 dB. Their reflectance shall be lower than 60 dB (). i) Terminated ports: The reflectance from terminated ports shall be lower than 60 dB. j) Polarization controller: This device shall be able to convert any state of polarization of a signal to any other state of polarization. Th
38、e polarization controller may consist of an all fibre polarization controller or a quarter-wave 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 change in insertion loss of
39、 this device shall be less than 0,1 dB (). 5 Test sample The OA shall operate at nominal specified operating conditions. Care shall be taken in maintaining the state of polarization of the input light during the measurement. NOTE Because of the intrinsic gain of the device, the reflectance at each p
40、ort of the OA may depend on the optical gain, and consequently on signal and pump power. 6 Procedure 6.1 Maximum and minimum input reflectance This method permits determination of the OA input reflectance with the use of an optical coupler and an optical isolator whose insertion loss is previously m
41、easured. In order to have a correct determination of the input reflectance, the contribution of the reverse ASE power, PASE, at the signal wavelength, shall be discriminated and appropriately subtracted. The measurement procedures described below shall be followed. OPTICAL POWER METEROPTICAL SOURCE
42、a) Source optical power measurementOPTICAL SOURCE b) Optical coupler and isolator output power measurement2 x 23421OPTICAL COUPLERTERMINATED PORTOPTICAL ISOLATORTERMINATED PORTOPTICAL POWER METERIEC 1003/06 IEC 1004/06 Figure 2 Set-up for insertion loss measurement of optical coupler and isolator EN
43、 61290-5-1:2006 7 POLARIZATIONCONTROLLEROPTICALPOWERMETERdBVARIABLEOPTICALATTENUATORa) OFA input power measurement with optical power meter2 x 21234OPTICALCOUPLERTERMINATEDPORTTERMINATEDPORTOPTICALISOLATORdBVARIABLEOPTICALATTENUATORb) OFA input power measurement with optical spectrum analyzer2 x 212
44、34OPTICALCOUPLERTERMINATEDPORTTERMINATEDPORTOPTICALSPECTRUMANALYZEROPTICALISOLATOROPTICALSOURCEOPTICALSOURCEPOLARIZATIONCONTROLLERIEC 310/2000IEC 311/2000Figure 3 Set-up for OA input power measurements 6.1.1 Calibration 6.1.1.1 Measurement of optical coupler, isolator, and connectors insertion losse
45、s with a power meter In order to evaluate the insertion loss between ports 3 and 2 of the optical coupler and of the optical isolator, set the optical source at the measurement wavelength, as specified in the relevant detail specification and measure the source optical power, P3, with an optical pow
46、er meter, as shown in Figure 2a. Connect the optical source at port 3 of the coupler and the optical isolator at port 2 of the coupler and measure the optical power at the isolator output, P3, with the optical power meter, as shown in Figure 2b, having terminated ports 1 and 4 of the coupler. 6.1.1.
47、2 Measurement of input reflectance with an optical spectrum analyzer Calibrate the test set-up by measuring the maximum optical power reflected backward not coming from the OA, Pcal, as shown in Figure 1, but without the OA, and terminating the coupler port 3, using the polarization controller to fi
48、nd the maximum reflected power. 6.1.1.3 Determination of the OA input power Measure the OA input power with the optical power meter for calibration, as shown in Figure 3a and set the variable optical attenuator in a way to provide an OA input optical power Pin, as specified in the relevant detail sp
49、ecification. To calibrate the optical spectrum analyzer, measure the OA input power Pinwith the optical spectrum analyzer, as shown in Figure 3b. EN 61290-5-1:2006 8 6.1.2 OA reflectance measurement Insert the OA as shown in Figure 1 and measure the maximum and minimum OA reflected power, PMAXand PMINrespectively, at the signal wavelength, adjusting the polarization controller for maximum and minimum values. Also, at the polariza
