Fibre optic communication subsystem test procedures - Part 2-9: Digital systems - Optical signal-to-noise ratio measurement for dense wavelength-division multiplexed systems

IEC 61280-2-9:2009 provides a parameter definition and a test method for obtaining optical signal-to-noise ratio (OSNR) using apparatus that measures the optical spectrum at 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 Fabry-Perot-based OSA.
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 paragraph has been added to the Scope describing the limitations due to signal spectral width and wavelength filtering;
- and Annex B has been added to further explain error in measuring noise level due to signal spectral width and wavelength filtering.

Procédures d'essai des sous-systèmes de télécommunications à fibres optiques - Partie 2-9: Systèmes numériques - Mesure du rapport signal sur bruit optique pour les systèmes multiplexés à répartition en longueur d'onde dense

La CEI 61280-2-9:2009 fournit une définition de paramètres et une méthode d'essai pour obtenir un rapport signal sur bruit optique (OSNR) en utilisant un appareillage destiné à mesurer le spectre optique au niveau d'une interface multivoie. Du fait qu'une mesure de bruit est effectuée sur un analyseur de spectre optique, le bruit mesuré n'inclut pas le bruit à intensité relatif de la source (RIN) ou le bruit de récepteur. Trois réalisations relatives aux analyseurs de spectre optique (OSA) sont en cours de discussion:
- un OSA réalisé à partir d'un réseau de diffraction,
- un OSA réalisé à partir d'un interféromètre Michelson,
- et un OSA réalisé à partir d'un Fabry-Perot.
Cette deuxième édition annule et remplace la première édition parue en 2002 et constitue une révision technique. Les changements principaux par rapport à la première édition sont les suivants:
- Un paragraphe a été ajouté au Domaine d'application, décrivant les limites dues à la largeur spectrale du signal et au filtrage en longueur d'onde;
- et L'Annexe B a été ajoutée, afin de mieux expliquer les erreurs survenant lors de la mesure du niveau de bruit dû à la largeur spectrale du signal et au filtrage en longueur d'onde.

General Information

Status
Published
Publication Date
10-Feb-2009
Current Stage
PPUB - Publication issued
Start Date
31-May-2009
Completion Date
11-Feb-2009
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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

Procédures d'essai des sous-systèmes de télécommunications
à fibres optiques –
Partie 2-9: Systèmes numériques – Mesure du rapport signal sur bruit optique
pour les systèmes multiplexés à répartition en longueur d'onde dense

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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

Procédures d'essai des sous-systèmes de télécommunications
à fibres optiques –
Partie 2-9: Systèmes numériques – Mesure du rapport signal sur bruit optique
pour les systèmes multiplexés à répartition en longueur d'onde dense

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
S
CODE PRIX
ICS 33.180.20 ISBN 978-2-88910-477-2
– 2 – 61280-2-9 © IEC:2009
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.7
2 Normative references .8
3 Definition.8
4 Apparatus.9
4.1 General .9
4.2 Diffraction grating-based OSA .9
4.3 Michelson interferometer-based OSA .10
4.4 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 Sensitivity.11
4.5.4 Resolution bandwidth (RBW) .11
4.5.5 Resolution bandwidth accuracy .12
4.5.6 Dynamic range .12
4.5.7 Scale fidelity.13
4.5.8 Polarization dependence .13
4.5.9 Wavelength data points .13
5 Sampling and specimens.13
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
wavelength filtering.19
Bibliography.21

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 Michelson interferometer-based OSA.10
Figure 5 – A Fabry-Perot-based OSA.11
Figure 6 – Illustration of insufficient dynamic range as another source of measurement
uncertainty.
Figure A.1 – The power spectrum of a 10 Gb/s, 2 − 1 PRBS signal showing the
considerable amount of power not captured in a 0,1 nm RBW with 0,64 nm filtering
after the signal.17
Figure A.2 – The spectrum of a 2,5 Gb/s 2 − 1 PRBS with 0,36 nm filtering with
considerably less power outside the 0,1 nm OSA RBW .
Figure A.3 – Signal power error versus RBW for a 10 Gb/s modulated signal.18

61280-2-9 © IEC:2009 – 3 –
Figure A.4 – Signal power error versus RBW for a 2,5 Gb/s modulated signal.18
Figure B.1 – Example for noise filtering between channels for a 200 GHz grid .20

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 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

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