1、BRITISH STANDARD Optical fibre amplifiers - Basic specification - Part 6-1: Test methods for pump leakage parameters - Optical demultiplexer * * VJ The European Standard EN 6129W1:1998 has the status of a British Standard ICs 33.180.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIG
2、KT LAW BS EN 61290-6-1: 1998 IEC 6 1290-6- 1: 1998 BS EN 61290-6-1:1998 Amd. No. This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 October 1998 Date Text affected
3、National foreword This British Standard is the English language version of EN 61290-6-1:1998. It is identical with IEC 612961:1998. The UK participation in its preparation was entrusted by Technical Committee GEM%, Fibre optics, to Subcommittee GEL/86/3, Fibre optic systems and active devices, which
4、 has the responsibility to: - aid enquirers to understand the text; - present to the responsible internationaVEuropean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; - monitor related international and European developments and promulgate
5、them in the UK. A list of organizations represented on this subcommittee can be obtained 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 ch
6、ange over from one numbering system to the other, publications may contain identifiers from 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 E
7、uropean publications. The British Standards which implement intemational or European publications 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 E
8、lectronic Catalogue. A British Standard does not purport to include all the necessary provisions 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 Thi
9、s document comprises a front cover, an inside front cover, the EN title page, pages 2 to 12, an inside back cover and a back cover. O BSI 1998 ISBN O 680 3488 4 STD-BSI BS EN b2270-b-L-ENGL 1778 1bZLibbS 0727LLiLi 714 m EUROPEAN STANDARD NORM EUROPENNE EUROPISCHE NORM EN 61 290-6-1 August 1998 ICs 3
10、3.180.40 English version Optical fibre amplif ers - Basic specification Part 6-1 : Test methods for pump leakage parameters Optical demultiplexer (IEC 61 290-6-1 :1998) Amplificateurs fibres optiques Spcification de base Partie 6-1 : Mthodes dessai pour les paramtres de fuite de pompe Dmultiplexeur
11、optique (CE1 61 290-6-1 : 1998) Lichtwellenleiter-Verstrker Grundspezifikation Teil 6-1 : Prfverfahren fr Pumpverlustparameter Optischer Demultiplexer (IEC 61 290-6-1 1998) * * v, This European Standard was approved by CENELEC on 1998-08-01. CENELEC members are bound to comply with the CENKENELEC In
12、ternal 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 obtained on application to the Central Secretariat or to any CENELEC
13、 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 Central Secretariat has the same status as the official versions. CE
14、NELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnica
15、l Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 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 61
16、290-6-1 : 1998 E STD-BSI BS EN b1270-b-L-ENGL 1998 Lb24bb7 0727345 b50 D Page 2 EN 61290-6-1:1998 Foreword The text of document 86C/180/FDIS, future edition 1 of IEC 61 290-6-1, prepared by SC 86C, Fibre optic systems and active devices, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC p
17、arallel vote and was approved by CENELEC as EN 61 290-6-1 on 1998-08-01. 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) 1999-05-01 - latest date by which the national stand
18、ards conflicting with the EN have to be withdrawn (dow) 2001 -05-01 Annexes designated “normative“ are part of the body of the standard. Annexes designated “informative“ are given for information only. In this standard, annex ZA is normative and annexes A and B are informative. Annex ZA has been add
19、ed by CENELEC. Endorsement notice The text of the International Standard IEC 61 290-6-1 :1998 was approved by CENELEC as a European Standard without any modification. In the official version, for annex B, Bibliography, the following notes have to be added for the standards indicated: IEC 60825-1 IEC
20、 60825-2 NOTE: Harmonized as EN 60825-1 :1994inot modified) + Al 1 :1996. NOTE: Harmonized as EN 60825-2:19941not modified). IEC 6131 5 NOTE: Harmonized as EN 6131 5:1997 (not modified). - STD-BSI BS EN b1270-b-1-ENGL 1998 Lb2LibbS 072714b 577 = Page 3 EN 61290-6-1:1998 CONTENTS Page INTRODUCTION .
21、4 ClauBe 1 Scope and object 5 2 Normative reference 5 3 Apparatus 5 4 Test sample . 7 5 Procedure 6 Calculation 9 7 Test results . . . 7 . 9 Figure 1 - Typical arrangement of the optical demultiplexer test apparatus for pump Figure 2 - Set-up for insertion loss measurement of the optical demultiplex
22、er leakage measurements 6 8 Annex A (informative) List of abbreviations 1 O Annex B (informative) Bibliography 11 Annex ZA Normative references to international publications with their corresponding European publications . 12 O BSI 1998 Page 4 EN 61290-6-1:1998 INTRODUCTION As far as can be determin
23、ed, this is the first International 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 a
24、ppears. However, for an easier understanding of the whole text, a list of all abbreviations used is given in annex A. STD.BS1 BS EN bL290-b-l-ENGL 1778 1b24bb 0727348 3bT = Page 5 EN 61290-6-1:1998 OPTICAL FIBRE AMPLIFIERS - BASIC SPECIFICATION - Part 6-1 : Test methods for pump leakage parameters -
25、 Optical demultiplexer 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 establish uniform requirements for accurate and reliable measurements, b
26、y means of the optical demultiplexer test method, of the following OFA parameters, as defined in clause 3 of IEC 61 291 -1 : a) pump leakage to output; b) pump leakage to input. NOTE - All numerical values followed by ($) are currently under consideration. 2 Normative reference The following normati
27、ve document contains provisions which, through reference in this text, constitute provisions of this part of IEC 61290. At the time of publication, the edition indicated was valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC 61290 are encourag
28、ed to investigate the possibility of applying the most recent edition of the normative document indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IEC 61291-1, - Optical fibre amplifiers - Pari 7: Generic specification 1) 3 Apparatus A scheme of th
29、e measurement Set-up. is given in figure 1. 1) To be published. Page 6 EN 61290-6-1:1998 I yc AT B Variable - - 0 -IIB LI f? I optical SOUTCB Optical demultiplexer Optical isolator Optical optical OFA attenuator under test IEC 71W Figure la - Set-up pump leakage measurements at OFA output Figure 1 b
30、 - Set-up pump leakage measurements at OFA input Figure 1 - Typical management of the opticel demultiplexer test apparatus for pump leakage measurements The test equipment listed below, with the required characteristics, is needed: a) optical source; The optical source shall emit a light at the sign
31、al wavelength and, for optical demultiplexer calibration, at the pump wavelength. A wavelength-tunable optical source covering both wavelength ranges, or two optical sources at fixed wavelength shall be used: - fixed-wavelength optical source: This optical source shall generate a light with a wavele
32、ngth and optical power specified in the relevant detail specification. Unless otherwise specified, the optical source shall emit a continuous wave with the full width at half maximum of the spectrum narrower than 1 nm ($). A distributed feedback (DFB) laser, a distributed Bragg reflector (DBR) laser
33、, an external cavity laser diode (ECL), and a light-emitting diode (LED) with a narrow-band filter are applicable, for example; - wsvelength-tunable optical source: This optical source shall be able to generate a wavelength-tunable light within the range specified in the relevant detail specificatio
34、n. Its optical power shall be specified in the relevant detail specification. Unless otherwise specified, the optical source shall emit a continuous wave with the full width at half maximum of the spectrum narrower than 1 nm ($). An ECL or an LED with a narrow bandpass optical filter is applicable,
35、for example. The suppression ratio of side modes for the ECL shall be higher than 30 dB ($); NOTE - The use of an LED should be limited to small-signal measurements. STD.BSI BS EN b1290-b-L-ENGL 3998 m Lb24bb 0727350 TL c) variable optical attenuator: It shall be insensitive to polarization, and its
36、 attenuation range and stability shall be over 40 dB ($) and better than 10,l dB ($), respectively. The reflectance from this device shall be smaller than -40 dB ($) at each port; d) optical demultiplexer: The polarization dependence of the optical demultiplexer trans- missivity shall be less than 1
37、0,l dB ($). This device 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; - the port B shall have a passband at the pump wavelength range, and with a loss higher than 20 dB ($)
38、 at the signal wavelength range (this ensures that also the amplified spontaneous emission is blocked by this port); - the port C shall have a bandpass at the signal wavelength range and with a loss higher than 20 dB ($) at the pump wavelength range; - the reflectance from port A shall be lower than
39、 -50 dB (*); e) optical power meter: It shall have a measurement accuracy better than 10,2 dB, irrespective of the state of polarization, within the signai and the pump Wavelength ranges of the OFA; f) optical fibre jumpers: The mode field diameter of the optical fibre jumpers used should be as clos
40、e as possible to that of fibres used as input and output ports of the OFA. Their reflectance shaii be smaller than 40 dB ($) at each port, and the length of each jumper shall be less than 2 m. 4 Test sample The OFA shall operate at nominal operating conditions. Care shall be taken in maintaining the
41、 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 because of the slight polarization dependency expected from all the optical components used, these leading to measurement errors. 5 Procedu
42、re 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 optical demultiplexer, and discriminated from the signal power by means of an optical demultiplexer, whose insertion loss shall be previou
43、sly determined. The measurement procedures described below shall be followed: a) pump leakage to output 1) in order to evaluate the optical demultiplexer insertion loss, set the optical source, as shown in figure 2, at the pump wavelength, as specified in the relevant detail specif ication. 2) Measu
44、re the optical power, Pa, at the optical demultiplexer output port B, with an optical power meter as shown in figure 2, having terminated port C. 3) Measure the optical power, PA, at the optical demultiplexer input port A, as shown in figure 2, but replacing the optical demultiplexer with the optica
45、l power meter. Page 8 EN 61290-6-1:1998 optid SOUICB NOTE - If the optical demultiplexer insertion loss (L = PA - Pe) strongly depends on the wavelength in the pump wavelength region, a certain measurement error could be introduced, due to the possible different Wavelength distributions of the optic
46、al 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 power level be sufficiently high). In this case, procedures 2) and 3) could be followed using a Set-
47、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 the previous one). 4) Set the optical source at the test signal wavelength specified in the relevan
48、t detail specification, as shown in figure la. 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 Pin specified in the relevant detail specification, measuring the OFA input signal optical power, as shown in figure la, b
49、ut replacing the OFA under test with an optical power meter. 6) Measure the residual pump power at the OFA output, PPI with an optical power meter as shown in figure la. I 7- A C dB L B Variable -I Optical isolator Optical demultiplexer optical attenuator Optical meter IEC 7121W Figure 2 - Set-up for inaertion loss measurement of the optical demultiplexer b) pump leakage to input As in 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
