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IEC 61280-1-3
Edition 3.0 2021-07
INTERNATIONAL
STANDARD
colour
inside
Fibre optic communication subsystem test procedures –
Part 1-3: General communication subsystems – Measurement of central
wavelength, spectral width and additional spectral characteristics
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IEC 61280-1-3
Edition 3.0 2021-07
INTERNATIONAL
STANDARD
colour
inside
Fibre optic communication subsystem test procedures –
Part 1-3: General communication subsystems – Measurement of central
wavelength, spectral width and additional spectral characteristics
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.01 ISBN 978-2-8322-9954-8
– 2 – IEC 61280-1-3:2021 © IEC 2021
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviated terms . 6
3.1 Wavelength . 6
3.2 Spectral width . 7
3.3 Additional spectral characteristics . 7
3.4 Abbreviated terms . 8
4 Apparatus . 8
4.1 Calibrated optical spectrum analyzer (OSA) . 8
4.2 Calibrated optical wavelength meter (OWM) . 8
4.3 Power supplies . 9
4.4 Input signal source or modulator . 9
4.5 Test cord . 9
5 Test sample . 9
6 Procedure (method A) . 9
6.1 General . 9
6.2 Setup . 10
6.3 Adjustment of spectrum analyzer controls . 10
6.4 Setting of optical wavelength meter. 11
7 Procedure (method B) . 11
7.1 Setup . 11
7.2 Adjustment of spectrum analyzer controls . 11
7.3 Setting of optical wavelength meter. 11
7.4 Continuous LED and SLM spectra . 12
7.5 Discrete MLM spectra . 12
7.6 SLM spectra. 12
8 Calculation . 13
8.1 General . 13
8.2 Centre wavelength . 13
8.2.1 Continuous LED spectra . 13
8.2.2 Discrete MLM spectra . 13
8.3 Centroidal wavelength . 13
8.4 Peak wavelength . 14
8.4.1 Continuous LED and SLM spectra . 14
8.4.2 Discrete MLM spectra . 14
8.5 RMS spectral width (Δλ ) . 14
rms
8.6 n-dB-down spectral width (Δλ ) . 14
n-dB
8.7 Full-width at half-maximum spectral width (Δλ ) . 14
fwhm
8.7.1 Continuous LED spectra . 14
8.7.2 Discrete MLM spectra . 15
8.8 Side-mode suppression ratio (SMSR) . 15
8.9 Signal-to-source spontaneous emission ratio (SSER) . 15
9 Test results . 15
9.1 Required information . 15
9.2 Information to be available on request . 16
10 Examples of results . 16
Bibliography . 21
Figure 1 – Example of a LED optical spectrum . 16
Figure 2 – Typical spectrum analyzer output for MLM laser . 18
Figure 3 – Δλ spectral width measurement for MLM laser. 18
fwhm
Figure 4 – Δλ spectral width calculation for MLM laser . 19
fwhm
Figure 5 – Peak emission wavelength and Δλ measurement for SLM laser . 19
30-dB
Figure 6 – Resolution bandwidth (RBW) dependence of SMSR for SLM laser . 20
Figure 7 – Signal-to-source spontaneous emission ratio measurement for SLM laser . 20
Table 1 – Measurement points for LED spectrum from Figure 1 . 17
Table 2 – RMS spectral characterization . 17
– 4 – IEC 61280-1-3:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC COMMUNICATION SUBSYSTEM TEST PROCEDURES –
Part 1-3: General communication subsystems – Measurement of central
wavelength, spectral width and additional spectral characteristics
FOREWORD
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IEC 61280-1-3 has been prepared by subcommittee 86C: Fibre optic systems and active
devices, of IEC technical committee 86: Fibre optics. It is an International Standard.
This third edition cancels and replaces the second edition published in 2010. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of measurement of signal-to-source spontaneous emission ratio in 8.9;
b) change of document title to reflect the additional measurement;
c) additional information on the resolution bandwidth used in the measurement of the side-
mode suppression ratio in 8.8;
d) use of a calibrated optical wavelength meter for accurate wavelength measurements of
single-longitudinal mode lasers.
The text of this International Sta
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