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

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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

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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

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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