1、BRITISH STANDARD BS EN 61290-6-1:1998 IEC 61290-6-1:1998 Optical fibre amplifiers Basicspecification Part 6-1: Test methods for pump leakage parameters Optical demultiplexer The European Standard EN 61290-6-1:1998 has the status of a British Standard ICS 33.180.20BSEN 61290-6-1:1998 This British Sta
2、ndard, having been prepared under the directionof the Electrotechnical Sector Board, was published underthe authority of the Standards Board and comes intoeffect on 15 October 1998 BSI 04-1999 ISBN 0 580 30488 4 National foreword This British Standard is the English language version of EN61290-6-1:1
3、998. It is identical with IEC 61290-6-1:1998. The UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/3, Fibre optic systems and active devices, which has the responsibility to: aid enquirers to understand the text; present to the res
4、ponsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained
5、on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers fr
6、om both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement international or European pub
7、lications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary pr
8、ovisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title p
9、age, pages 2 to 8 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSEN 61290-6-1:1998 BSI 04-1999 i Conte
10、nts Page National foreword Inside front cover Foreword 2 Text of EN 61290-6-1 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61290-6-1 August 1998 ICS 33.180.40 English version Optical fibre amplifiers Basic specification Part 6-1: Test methods for pump leakage parameters Optical demu
11、ltiplexer (IEC 61290-6-1:1998) Amplificateurs fibres optiques Spcification de base Partie 6-1: Mthodes dessai pour les paramtres de fuite de pompe Dmultiplexeur optique (CEI 61290-6-1:1998) Lichtwellenleiter-Verstrker Grundspezifikation Teil 6-1: Prfverfahren fr Pumpverlustparameter Optischer Demult
12、iplexer (IEC 61290-6-1:1998) This European Standard was approved by CENELEC on 1998-08-01. 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-da
13、te 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 version in any other language made by translation under
14、 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, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ir
15、eland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassar
16、t 35, B-1050 Brussels 1998 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61290-6-1:1998 EEN61290-6-1:1998 BSI 04-1999 2 Foreword The text of document 86C/180/FDIS, future edition1 of IEC 61290-6-1, prepared by SC 86C, Fibre optic
17、systems and active devices, of IECTC86, Fibre optics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61290-6-1 on 1998-08-01. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. Annexes designated “informative” are gi
18、ven for information only. In this standard, Annex ZA is normative and Annex A and Annex B are informative. Annex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC 61290-6-1:1998 was approved by CENELEC as a European Standard without any modification. In the
19、official version, for Annex B, Bibliography, the following notes have to be added for the standards indicated: IEC 60825-1 NOTEHarmonized as EN 60825-1:1994 (notmodified) + A11:1996. IEC 60825-2 NOTEHarmonized as EN 60825-2:1994 (notmodified). IEC 61315 NOTEHarmonized as EN 61315:1997 (notmodified).
20、 Contents Page Foreword 2 Introduction 3 1 Scope and object 3 2 Normative reference 3 3 Apparatus 3 4 Test sample 4 5 Procedure 4 6 Calculation 6 7 Test results 6 Annex A (informative) List of abbreviations 7 Annex B (informative) Bibliography 7 Annex ZA (normative) Normative references to internati
21、onalpublications with their correspondingEuropean publications 8 Figure 1 Typical arrangement of the opticaldemultiplexer test apparatus for pumpleakage measurements 5 Figure 2 Set-up for insertion loss measurementofthe optical demultiplexer 6 latest date by which the EN has to be implemented at nat
22、ional level by publication of an identical national standard or by endorsement (dop) 1999-05-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2001-05-01EN61290-6-1:1998 BSI 04-1999 3 Introduction As far as can be determined, this is the first Internat
23、ional Standard on optical fibre amplifiers. The technology of optical fibre amplifiers is quite new and still emerging, hence amendments and new editions to this standard can be expected. Each abbreviation introduced is explained in the text at least the first time it appears. However, for an easier
24、 understanding of the whole text, a list of all abbreviations used is given in Annex A. 1 Scope and object This part of IEC 61290 applies to optical fibre amplifiers (OFAs) using active fibres, containing rare-earth dopants, presently commercially available. The object of this standard is to establi
25、sh uniform requirements for accurate and reliable measurements, by means of the optical demultiplexer test method, of the following OFA parameters, as defined in clause 3 of IEC 61291-1: a) pump leakage to output; b) pump leakage to input. NOTEAll numerical values followed by () are currently under
26、consideration. 2 Normative reference The following normative document contains provisions which, through reference in this text, constitute provisions of this part of IEC 61290. At the time of publication, the edition indicated was valid. All normative documents are subject to revision, and parties
27、to agreements based on this part of IEC 61290 are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 61291-1, Optical fibre amplifiers Part1
28、:Generic specification 1) . 3 Apparatus A scheme of the measurement set-up is given in Figure 1. The test equipment listed below, with the required characteristics, is needed: a) optical source: The optical source shall emit a light at the signal wavelength and, for optical demultiplexer calibration
29、, at the pump wavelength. A wavelength-tunable optical source covering both wavelength ranges, or two optical sources at fixed wavelength shall be used: fixed-wavelength optical source: This optical source shall generate a light with a wavelength and optical power specified in the relevant detail sp
30、ecification. Unless otherwise specified, the optical source shall emit a continuous wave with the full width at half maximum of the spectrum narrower than1nm(). A distributed feedback (DFB) laser, a distributed Bragg reflector (DBR) laser, an external cavity laser diode (ECL), and a light-emitting d
31、iode (LED) with a narrow-band filter are applicable, for example; wavelength-tunable optical source: This optical source shall be able to generate a wavelength-tunable light within the range specified in the relevant detail specification. Its optical power shall be specified in the relevant detail s
32、pecification. Unless otherwise specified, the optical source shall emit a continuous wave with the full width at half maximum of the spectrum narrower than1nm(). An ECL or an LED with a narrow bandpass optical filter is applicable, for example. The suppression ratio of side modes for the ECL shall b
33、e higher than 30 dB (); NOTEThe use of an LED should be limited to small-signal measurements. b) optical isolator: The polarization-dependent loss variation of the isolator shall be better than0,2 dB (). Optical isolation shall be better than 40 dB (). The reflectance from this device shall be small
34、er than 40 dB () at each port; c) variable optical attenuator: It shall be insensitive to polarization, and its attenuation range and stability shall be over 40 dB () and better than 0,1 dB (), respectively. The reflectance from this device shall be smaller than40 dB () at each port; d) optical demu
35、ltiplexer: The polarization dependence of the optical demultiplexer transmissivity shall be less than 0,1 dB (). Thisdevice shall have the following characteristics: the port A shall have a passband at the pump and the signal wavelength ranges, it shall be internally connected to ports B and C; 1) T
36、o be published.EN61290-6-1:1998 4 BSI 04-1999 the port B shall have a passband at the pump wavelength range, and with a loss higher than 20 dB () at the signal wavelength range (this ensures that also the amplified spontaneous emission is blocked by this port); the port C shall have a bandpass at th
37、e signal wavelength range and with a loss higher than 20 dB () at the pump wavelength range; the reflectance from port A shall be lower than 50 dB (); e) optical power meter: It shall have a measurement accuracy better than 0,2 dB, irrespective of the state of polarization, within the signal and the
38、 pump wavelength ranges of the OFA; f) optical fibre jumpers: The mode field diameter of the optical fibre jumpers used should be as close as possible to that of fibres used as input and output ports of the OFA. Their reflectance shall be smaller than 40 dB () at each port, and the length of each ju
39、mper shall be less than 2m. 4 Test sample The OFA shall operate at nominal operating conditions. Care shall be taken in maintaining the state of polarization of the input light during the measurement. Changes in the polarization state of the input light may result in input optical power changes beca
40、use of the slight polarization dependency expected from all the optical components used, these leading to measurement errors. 5 Procedure This method permits determination of both the pump leakage to output and to input through the measurement of the pump power exiting the OFA, measured after an opt
41、ical demultiplexer, and discriminated from the signal power by means of an optical demultiplexer, whose insertion loss shall be previously determined. The measurement procedures described below shall be followed: a) pump leakage to output 1) In order to evaluate the optical demultiplexer insertion l
42、oss, set the optical source, as shown in Figure 2, at the pump wavelength, as specified in the relevant detail specification. 2) Measure the optical power, P B , at the optical demultiplexer output port B, with an optical power meter as shown in Figure 2, having terminated port C. 3) Measure the opt
43、ical power, P A , at the optical demultiplexer input port A, as shown in Figure 2, but replacing the optical demultiplexer with the optical power meter. NOTEIf the optical demultiplexer insertion loss (L = P A P B ) strongly depends on the wavelength in the pump wavelength region, a certain measurem
44、ent error could be introduced, due to the possible different wavelength distributions of the optical source and the pump laser of the OFA under test. A possibility to reduce this error consists in using the pump laser of the OFA under test itself as optical source (provided that the residual pump po
45、wer level be sufficiently high). In this case, procedures 2) and 3) could be followed using a set-up similar to the one of Figure 2, but replacing the optical source with the OFA under test followed by a filter having a bandpass at the pump wavelength (e.g. another optical demultiplexer similar to t
46、he previous one). 4) Set the optical source at the test signal wavelength specified in the relevant detail specification, as shown in Figure 1a. 5) Set the optical source and the variable optical attenuator in a way to provide, at the input port of the OFA, the optical power P inspecified in the rel
47、evant detail specification, measuring the OFA input signal optical power, as shown in Figure 1a, but replacing the OFA under test with an optical power meter. 6) Measure the residual pump power at the OFA output, P p , with an optical power meter as shown in Figure 1a. b) pump leakage to input As in
48、 a), but replace procedures 4) to 6) with the following: 4) Set the optical source at the test signal wavelength specified in the relevant detail specification, as shown in Figure 1b. 5) Set the optical source and the variable optical attenuator in a way to provide, at the input port of the OFA, the
49、 optical power P inspecified in the relevant detail specification, measuring the OFA input signal optical power, as shown in Figure 1b, but replacing the OFA under test with an optical power meter. 6) Measure the residual pump power at the OFA input, P p , with an optical power meter as shown in Figure 1b.EN61290-6-1:1998 BSI 04-1999 5 Figure 1 Typical management of the opticaldemultiplexer test apparatus forpumpleakagemeasurementsEN61290-6-1:1998 6 BSI 04-1999 6 Calculation a) Pump leakage to ou
