BS EN 61290-10-3-2003 Optical amplifiers - Test methods - Multichannel parameters - Probe methods《光学纤维放大器 试验方法 多道参数 探测法》.pdf

1、BRITISH STANDARD BS EN 61290-10-3: 2003 Optical amplifiers Test methods Part 10-3: Multichannel parameters Probe methods The European Standard EN 61290-10-3:2003 has the status of a British Standard ICS 33.180.20 BS EN 61290-10-3:2003 This British Standard was published under the authority of the St

2、andards Policy and Strategy Committee on 1 September 2003 BSI 1 September 2003 ISBN 0 580 42508 8 National foreword This British Standard is the official English language version of EN 61290-10-3:2003. It is identical with IEC 61290-10-3:2002. The UK participation in its preparation was entrusted by

3、 Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/3, Fibre optic systems and active devices, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement i

4、nternational or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not

5、purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enqu

6、iries 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. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 21 and a back

7、cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 61290-10-3 NORME EUROPENNE EUROPISCHE NORM July 2003 CENELEC European Committee for Electrotechnical Standardization

8、Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61290-10-3:2003 E ICS

9、 33.180.20 English version Optical amplifiers - Test methods Part 10-3: Multichannel parameters - Probe methods (IEC 61290-10-3:2002) Amplificateurs optiques - Mthodes dessai Partie 10-3: Paramtres canaux multiples - Mthodes par sondage (CEI 61290-10-3:2002) Prfverfahren fr Lichtwellenleiter-Verstrk

10、er Teil 10-3: Mehrkanalparameter - Sondenmessverfahren (IEC 61290-10-3:2002) This European Standard was approved by CENELEC on 2003-02-01. 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 na

11、tional 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 versions (English, French, German). A version

12、 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 committees of Austria, Belgium, Czech Republic, Denmar

13、k, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Lithuania, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. Foreword The text of document 86C/459/FDIS, future edition 1 of IEC 61290-10-3, prepared by SC 86C, Fibre optic

14、 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 61290-10-3 on 2003-02-01. This standard shall be read in conjunction with EN 61291-1:1998 and EN 61290-3:2000 The following dates were fixed: latest date by which

15、 the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2004-02-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2006-02-01 Annexes designated “normative“ are part of the body of the sta

16、ndard. 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 added by CENELEC. _ Endorsement notice The text of the International Standard IEC 61290-10-3:2002 was approved by CENELEC as a Europe

17、an Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60825-1 NOTE Harmonized as EN 60825-1:1994 (not modified). IEC 60825-2 NOTE Harmonized as EN 60825-2:2000 (not modified). IEC 60874-1 NOTE Harmonized

18、 as EN 60874-1:1999 (not modified). _ Page2 EN61290103:200361290-10-3 IEC:2003 3 CONTENTS INTRODUCTION.4 1 Scope and object5 2 Normative references.6 3 Apparatus.6 3.1 Laser probe method 7 3.2 Broadband noise probe method.7 3.3 Detailed description of apparatus 8 4 Test sample11 5 Procedure11 5.1 Se

19、tting the saturation condition .11 5.2 Laser probe method 13 5.3 Broadband noise probe method.13 6 Calculations.15 6.1 Laser probe method 15 6.2 Broadband source method.16 7 Test results17 Annex A (informative) List of abbreviations 18 Annex B (informative) Relevant patents .19 Annex ZA (normative)

20、Normative references to international publications with their corresponding European publications .20 Bibliography21 Figure 1 Block diagrams for probe methods .8 Figure 2 Modulated optical sources9 Figure 3 A reduced set of saturating wavelengths (b) replaces the full set (a) in each region.12 Figur

21、e 4 Typical timing for broadband noise probe method 14 Page3 EN61290103:200361290-10-3 IEC:2003 4 INTRODUCTION Each abbreviation introduced in this International Standard is explained in the text at least the first time that it appears. However, for an easier understanding of the whole text, a list

22、of all abbreviations used in this International Standard is given in Annex A. Page4 EN61290103:200361290-10-3 IEC:2003 5 OPTICAL AMPLIFIERS TEST METHODS Part 10-3: Multichannel parameters Probe methods 1 Scope and object This part of IEC 61290 applies to commercially available optical fibre amplifie

23、rs (OFAs) using active fibres containing rare-earth dopants as described in the following. The object of this international standard is to establish uniform requirements for accurate and reliable measurements of the multichannel gain and noise parameters as defined in IEC 61291-4. The test methods d

24、escribed in this standard use small-signal probes to obtain the multichannel gain and noise parameters while one or more lasers set the saturation condition for the OFA. These methods are classified as indirect in that there is not a laser source at each wavelength of the multichannel plan. Multicha

25、nnel parameters are estimated from the probe data. IEC 61290-10-1 and IEC 61290-10-2 are test methods for measuring noise parameters using pulse techniques. These methods are direct in that the multichannel source is required to have a laser at each wavelength for which multichannel parameters are t

26、o be measured. Probe techniques provide clear advantages for measuring multichannel gain characteristics in that a simple source configuration can provide parameters for a wide range of multichannel plans. Either a small-signal laser or a broadband noise source serves as the probe signal, and single

27、 or multiple lasers are used to set the OFA saturation condition. Pulse modulation of the saturating sources may optionally be used to measure ASE at or near the saturating laser wavelengths without the contaminating effect of source spontaneous emission. If pulse modulation is not used, the source

28、spontaneous emission must be measured, and its effect removed from the measured result. For a multichannel source with high spontaneous emission or at high total input power, the source noise subtraction method can lead to large uncertainty. The probe techniques described herein are indirect in that

29、 laser sources are not required at each channel frequency. A measurement error results from inhomogeneous effects that are DUT dependent. The main source of this error is spectral hole burning (see 1 12 and 4). The applicability of pulse modulation of the saturating signal(s) and the selection of th

30、e modulation rate are dependent on the optical fibre amplifiers characteristics, specifically its time response. They may be unsuitable for amplifiers with active automatic level control (ALC) or automatic gain control (AGC) circuits. They may also be unsuitable for praseodymium- doped OFAs that hav

31、e gain relaxation times that are much faster than erbium-doped designs. For erbium-doped fibre amplifiers (EDFAs), inaccuracy due to modulation is generally small. Refer to IEC 61290-10-2 for a discussion of inaccuracy due to pulse repetition rate. 1Numbers in brackets refer to the bibliography. Pag

32、e5 EN61290103:200361290-10-3 IEC:2003 6 In order to predict multichannel parameters by probe methods it is necessary to properly set the output level of the saturating signal(s) to simulate the saturation effect of a specified multichannel plan. Clause 5 describes a methodology to accomplish this un

33、der the assumption of homogeneous behavior within a wavelength region. This methodology has the limitation that the wavelength dependence of any output coupling circuit from the active fibre to the output port is assumed to be zero within defined regions. Parameters measured with the methods describ

34、ed herein include channel gain, channel signal-spontaneous noise figure, and amplified spontaneous emission (ASE). Values marked with(*) indicate preliminary values. Final values are under study. 2 Normative references The following referenced documents are indispensable for the application of this

35、document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 61290-3, Optical fibre amplifiers Basic specification Part 3: Test methods for noise figure parameters IEC 61290-10-1, Optical

36、 amplifiers Test methods Part 10-1: Multichannel parameters Pulse method using an optical switch and optical spectrum analyzer IEC 61290-10-2, Optical amplifiers Test methods Part 10-2: Multichannel parameters Pulse method using a gated optical spectrum analyzer IEC 61291-1, Optical fibre amplifiers

37、 Part 1: Generic specification IEC 61291-4, Optical amplifiers Part 4: Multichannel applications Performance specification template 3 Apparatus The probe methods require two sources. The first establishes the inversion (saturation) level of the optical amplifier and consists of one or more lasers. T

38、he second source is the small- signal probe and may consist of a laser or broadband noise source. In either case, care must be taken that the probe does not effect amplifier inversion. The laser source module may be pulse modulated in order to extinguish the source for more-accurate noise measuremen

39、t as described in IEC 61290-10-1 or IEC 61290-10-2. For the probe methods described herein, modulation is optional. Both laser and noise probe methods can provide similar measurement uncertainty. The noise probe method is generally faster so is preferred when measurement throughput is important. Pag

40、e6 EN61290103:200361290-10-3 IEC:2003 7 3.1 Laser probe method Figure 1(a) is a diagram of the laser probe configuration. The source module, as described in 3.3, may consist of a single or multiple lasers. Optional polarization controllers following the sources improve accuracy by averaging system a

41、nd amplifier polarization dependencies. They also may be used to quantify the polarization dependent gain (PDG) and polarization hole burning (PHB) of the OFA. While a single polarization controller is shown external to the source module, for best accuracy with a multichannel source, each channel re

42、quires polarization averaging to eliminate uncertainty due to polarization hole burning. The optional optical switch at the output of the DUT is to implement the pulse technique with optical switching. 3.2 Broadband noise probe method Figure 1(b) is a diagram of the noise probe configuration. In ord

43、er for the broadband source to have sufficiently low total output power, it is necessary that it be modulated at a low repetition rate and a low duty cycle and that the OSA measurement be synchronized with the probe ON and OFF periods. This is accomplished with a control signal from the OSA. Page7 E

44、N61290103:200361290-10-3 IEC:2003 8 Trigger from source module Trigger to optical switch or OSA, when the source module is modulated Source module DUT OFA Optical spectrum analyzer Variable optical attenuator (optional) dB Coupler Variable optical attenuator DB Probe laser (tunable) Optical switch (

45、optional) Polarization controller (optional) Polarization controller (optional) Trigger from source module IEC 2623/02Figure 1a Block diagram for probe method using a laser probe source Trigger to optical switch or OSA Source module DUT OFA Optical spectrum analyzer Variable optical attenuator (opti

46、onal) dB Coupler Broadband noise source module Optical switch (optional) Polarization controller Control signal to broadband noise source Control signal from OSA Trigger from source module Trigger from source module IEC 2624/02Figure 1b Block diagram for probe method using a broadband noise probe so

47、urce Figure 1 Block diagrams for probe methods 3.3 Detailed description of apparatus 3.3.1 Source module When the source module is modulated, two arrangements are possible as shown in Figures 2a and 2b. Source module (a) consists of CW optical sources with an external optical switch and attenuator(s

48、). Source module (b) consists of directly modulated optical sources and attenuator(s). While only one attenuator is shown, for the multichannel source it will usually be necessary to independently set channel power so that an attenuator is necessary for each channel. While modulated sources are show

49、n, this procedure may be implemented with unmodulated sources as well. Page8 EN61290103:200361290-10-3 IEC:2003 9 Unless otherwise specified, the full width at half maximum (FWHM) of the output spectrum of source modules (a) and (b) shall be narrower than 0,1 nm(*) so as not to cause any interference to adjacent channels. The suppression ratio