IEC 61280-2-9-2009 Fibre optic communication subsystem test procedures - Part 2-9 Digital systems - Optical signal-to-noise ratio measurement for dense waveleng.pdf

1、 IEC 61280-2-9 Edition 2.0 2009-02 INTERNATIONAL STANDARD NORME INTERNATIONALE Fibre optic communication subsystem test procedures Part 2-9: Digital systems Optical signal-to-noise ratio measurement for dense wavelength-division multiplexed systems Procdures dessai des sous-systmes de tlcommunicatio

2、ns fibres optiques Partie 2-9: Systmes numriques Mesure du rapport signal sur bruit optique pour les systmes multiplexs rpartition en longueur donde dense IEC 61280-2-9:2009 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2009 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specifie

3、d, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or IECs member National Committee in the country of the requester. If you have any questions about I

4、EC copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or your local IEC member National Committee for further information. Droits de reproduction rservs. Sauf indication contraire, aucune partie de cette publication ne peut tre reprod

5、uite ni utilise sous quelque forme que ce soit et par aucun procd, lectronique ou mcanique, y compris la photocopie et les microfilms, sans laccord crit de la CEI ou du Comit national de la CEI du pays du demandeur. Si vous avez des questions sur le copyright de la CEI ou si vous dsirez obtenir des

6、droits supplmentaires sur cette publication, utilisez les coordonnes ci-aprs ou contactez le Comit national de la CEI de votre pays de rsidence. IEC Central Office 3, rue de Varemb CH-1211 Geneva 20 Switzerland Email: inmailiec.ch Web: www.iec.ch About the IEC The International Electrotechnical Comm

7、ission (IEC) is the leading global organization that prepares and publishes International Standards for all electrical, electronic and related technologies. About IEC publications The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the l

8、atest edition, a corrigenda or an amendment might have been published. Catalogue of IEC publications: www.iec.ch/searchpub The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,). It also gives information on projects, withdrawn and rep

9、laced publications. IEC Just Published: www.iec.ch/online_news/justpub Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available on-line and also by email. Electropedia: www.electropedia.org The worlds leading online dictionary of elec

10、tronic and electrical terms containing more than 20 000 terms and definitions in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical Vocabulary online. Customer Service Centre: www.iec.ch/webstore/custserv If you wish to give us your fe

11、edback on this publication or need further assistance, please visit the Customer Service Centre FAQ or contact us: Email: csciec.ch Tel.: +41 22 919 02 11 Fax: +41 22 919 03 00 A propos de la CEI La Commission Electrotechnique Internationale (CEI) est la premire organisation mondiale qui labore et p

12、ublie des normes internationales pour tout ce qui a trait llectricit, llectronique et aux technologies apparentes. A propos des publications CEI Le contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possdez ldition la plus rcente, un corrigendum ou amen

13、dement peut avoir t publi. Catalogue des publications de la CEI: www.iec.ch/searchpub/cur_fut-f.htm Le Catalogue en-ligne de la CEI vous permet deffectuer des recherches en utilisant diffrents critres (numro de rfrence, texte, comit dtudes,). Il donne aussi des informations sur les projets et les pu

14、blications retires ou remplaces. Just Published CEI: www.iec.ch/online_news/justpub Restez inform sur les nouvelles publications de la CEI. Just Published dtaille deux fois par mois les nouvelles publications parues. Disponible en-ligne et aussi par email. Electropedia: www.electropedia.org Le premi

15、er dictionnaire en ligne au monde de termes lectroniques et lectriques. Il contient plus de 20 000 termes et dfinitions en anglais et en franais, ainsi que les termes quivalents dans les langues additionnelles. Egalement appel Vocabulaire Electrotechnique International en ligne. Service Clients: www

16、.iec.ch/webstore/custserv/custserv_entry-f.htm Si vous dsirez nous donner des commentaires sur cette publication ou si vous avez des questions, visitez le FAQ du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 61280-2-9 Edition 2.0 2009-02 INTERNAT

17、IONAL STANDARD NORME INTERNATIONALE Fibre optic communication subsystem test procedures Part 2-9: Digital systems Optical signal-to-noise ratio measurement for dense wavelength-division multiplexed systems Procdures dessai des sous-systmes de tlcommunications fibres optiques Partie 2-9: Systmes numr

18、iques Mesure du rapport signal sur bruit optique pour les systmes multiplexs rpartition en longueur donde dense INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE S ICS 33.180.20 PRICE CODE CODE PRIX ISBN 2-8318-1029-1 Registered trademark of the International Elect

19、rotechnical Commission Marque dpose de la Commission Electrotechnique Internationale 2 61280-2-9 IEC:2009 CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative references .8 3 Definition8 4 Apparatus.9 4.1 General .9 4.2 Diffraction grating-based OSA .9 4.3 Michelson interferometer-based OSA 10 4

20、.4 Fabry-Perot-based OSA 10 4.5 OSA performance requirements 11 4.5.1 General .11 4.5.2 Wavelength range .11 4.5.3 Sensitivity11 4.5.4 Resolution bandwidth (RBW).11 4.5.5 Resolution bandwidth accuracy .12 4.5.6 Dynamic range 12 4.5.7 Scale fidelity13 4.5.8 Polarization dependence .13 4.5.9 Wavelengt

21、h data points .13 5 Sampling and specimens13 6 Procedure 13 7 Calculations .14 8 Measurement uncertainty .14 9 Documentation .14 Annex A (informative) Error in measuring signal level due to signal spectral width.16 Annex B (informative) Error in measuring noise level due to signal spectral width and

22、 wavelength filtering.19 Bibliography21 Figure 1 A typical optical spectrum at an optical interface in a multichannel transmission system .8 Figure 2 The OSNR for each channel as derived from direct measurements of the optical spectrum .9 Figure 3 A diffraction grating-based OSA.10 Figure 4 A Michel

23、son interferometer-based OSA10 Figure 5 A Fabry-Perot-based OSA11 Figure 6 Illustration of insufficient dynamic range as another source of measurement uncertainty13 Figure A.1 The power spectrum of a 10 Gb/s, 2 7 1 PRBS signal showing the considerable amount of power not captured in a 0,1 nm RBW wit

24、h 0,64 nm filtering after the signal17 Figure A.2 The spectrum of a 2,5 Gb/s 2 7 1 PRBS with 0,36 nm filtering with considerably less power outside the 0,1 nm OSA RBW.17 Figure A.3 Signal power error versus RBW for a 10 Gb/s modulated signal18 61280-2-9 IEC:2009 3 Figure A.4 Signal power error versu

25、s RBW for a 2,5 Gb/s modulated signal.18 Figure B.1 Example for noise filtering between channels for a 200 GHz grid20 Table A.1 Filtering used in simulation to determine signal power level error.16 Table A.2 RBW to achieve less than 0,1 dB error in signal power 18 4 61280-2-9 IEC:2009 INTERNATIONAL

26、ELECTROTECHNICAL COMMISSION _ FIBRE OPTIC COMMUNICATION SUBSYSTEM TEST PROCEDURES Part 2-9: Digital systems Optical signal-to-noise ratio measurement for dense wavelength-division multiplexed systems FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for stan

27、dardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes In

28、ternational Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may particip

29、ate in this preparatory work. International, governmental and non- governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement betwe

30、en the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publication

31、s have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

32、 misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding

33、national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edi

34、tion of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether di

35、rect or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispen

36、sable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61280-2-9

37、 has been prepared by subcommittee 86C: Fibre optic systems and active devices, of IEC technical committee 86: Fibre optics This second addition cancels and replaces the first edition published in 2002 and constitutes a technical revision. The main changes from the previous edition are as follows: A

38、 paragraph has been added to the Scope describing the limitations due to signal spectral width and wavelength filtering. Annex B has been added to further explain error in measuring noise level due to signal spectral width and wavelength filtering. 61280-2-9 IEC:2009 5 The text of this standard is b

39、ased on the following documents: CDV Report on voting 86C/823/CDV 86C/864/RVC Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A lis

40、t of all the parts in the IEC 61280 series, under the general title Fibre optic communication subsystem test procedures, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web s

41、ite under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 6 61280-2-9 IEC:2009 INTRODUCTION At the optical interfaces within wavelength-division multiplexed (WDM) network

42、s, it is desirable to measure parameters that provide information about the integrity of the physical plant. Such parameters are necessary to monitor network performance as an integral part of network management. They are also necessary to assure proper system operation for installation and maintena

43、nce of the network. Ideally, such parameters would directly correspond to the bit error ratio (BER) of each channel of a multichannel carrier at the particular optical interface. Related parameters such as Q-factor or those calculated from optical eye patterns would provide similar information, that

44、 is, they would correlate to the channel BER. However, it is difficult to obtain access to these parameters at a multichannel interface point. It is necessary to demultiplex the potentially large number of channels and make BER, Q-factor, or eye-diagram measurements on a per-channel basis. In contra

45、st, useful information about the optical properties of the multichannel carrier is readily obtained by measuring the optical spectrum. Wavelength-resolved signal and noise levels provide information on signal level, signal wavelength, and amplified spontaneous emission (ASE) for each channel. Spectr

46、al information, however, does not show signal degradation due to wave-shape impairments resulting from polarization-mode dispersion (PMD), and chromatic dispersion. Also, intersymbol interference and time jitter are not revealed from an optical signal to noise ratio (OSNR) measurement. In spite of t

47、hese limitations, OSNR is listed as an interface parameter in ITU-T Rec. G.692 1 1 , as an optical monitoring parameter in ITU-T Rec. G.697 2 and in ITU-T G Rec. Sup. 39 3. _ 1Figures in brackets refer to the bibliography. 61280-2-9 IEC:2009 7 FIBRE OPTIC COMMUNICATION SUBSYSTEM TEST PROCEDURES Part

48、 2-9: Digital systems Optical signal-to-noise ratio measurement for dense wavelength-division multiplexed systems 1 Scope This part of IEC 61280 provides a parameter definition and a test method for obtaining optical signal-to-noise ratio (OSNR) using apparatus that measures the optical spectrum at

49、a multichannel interface. Because noise measurement is made on an optical spectrum analyzer, the measured noise does not include source relative intensity noise (RIN) or receiver noise. Three implementations for an optical spectrum analyser (OSA) are discussed: a diffraction- grating-based OSA, a Michelson interferometer-based OSA, and a Fabr