Calibration of fibre-optic power meters

IEC 61315:2019 is available as IEC 61315:2019 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 61315:2019 is applicable to instruments measuring radiant power emitted from sources that are typical for the fibre-optic communications industry. These sources include laser diodes, light emitting diodes (LEDs) and fibre-type sources. Both divergent and collimated radiations are covered. This document defines the calibration of power meters to be performed by calibration laboratories or by power meter manufacturers. This third edition cancels and replaces the second edition published in 2005. It constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) update of terms and definitions; b) update of 5.1, including Table 1 (new type of source); c) update of Annex A; d) addition of Annex B on dB conversion. Keywords: Fibre-optic power meters

Kalibrierung von Lichtwellenleiter-Leistungsmessgeräten

Étalonnage de wattmètres pour dispositifs à fibres optiques

IEC 61315:2019 est disponible sous forme de IEC 61315:2019 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 61315:2019 s'applique aux appareils qui mesurent la puissance rayonnante émise par des sources typiques pour l'industrie des communications par fibres optiques. Ces sources comprennent les diodes laser, les diodes émettant de la lumière (LED) et les sources fibrées. Le rayonnement divergent ainsi que le rayonnement collimaté sont couverts par le présent document. Ce dernier définit l'étalonnage des wattmètres à effectuer par des laboratoires d'étalonnage ou par des fabricants de wattmètres. Cette troisième édition annule et remplace la deuxième édition parue en 2005. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) mise à jour des termes et définitions; b) mise à jour du 5.1, y compris le Tableau 1 (nouveau type de source); c) mise à jour de l'Annexe A; d) ajout d'une Annexe B sur la conversion en dB. Mots-clés : wattmètres pour dispositifs à fibres optiques

Umerjanje optičnih vlakenskih merilnikov moči (IEC 61315:2019)

Ta dokument se uporablja za instrumente merjenja moči sevanja, ki ga oddajajo viri, značilni za industrijo optičnih komunikacij. Ti viri vključujejo laserske diode, svetleče diode (LED) in vire vlakenskega tipa. Zajeta so divergentna in kolimirana sevanja. Ta dokument opredeljuje umerjanje merilnikov moči, ki ga izvajajo laboratoriji za umerjanje ali proizvajalci merilnikov moči.

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Standards Content (Sample)

SIST EN 61315:2006
Umerjanje optičnih vlakenskih merilnikov moči (IEC 61315:2019)
Calibration of fibre-optic power meters (IEC 61315:2019)
Kalibrierung von Lichtwellenleiter-Leistungsmessern (IEC 61315:2019)
Etalonnage de wattmètres pour dispositifs à fibres optiques (IEC 61315:2019)
Ta slovenski standard je istoveten z: EN IEC 61315:2019
33.140 Posebna merilna oprema za Special measuring
uporabo v telekomunikacijah equipment for use in
33.180.10 (Optična) vlakna in kabli Fibres and cables
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.


May 2019
ICS 33.140; 33.180.10 Supersedes EN 61315:2006
English Version
Calibration of fibre-optic power meters
(IEC 61315:2019)
Étalonnage de wattmètres pour dispositifs à fibres optiques Kalibrierung von Lichtwellenleiter-Leistungsmessgeräten
(IEC 61315:2019) (IEC 61315:2019)
This European Standard was approved by CENELEC on 2019-05-03. 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 national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61315:2019 E
European foreword
The text of document 86/533/CDV, future edition 3 of IEC 61315, prepared by IEC/TC 86 "Fibre
optics" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2020-02-03
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2022-05-03
document have to be withdrawn
This document supersedes EN 61315:2006.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 61315:2019 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
IEC 61040:1990 NOTE Harmonized as EN 61040:1992 (not modified)
IEC 60793-1-1 NOTE Harmonized as EN 60793-1-1
IEC 60793-1-43:2015 NOTE Harmonized as EN 60793-1-43:2015 (not modified)
IEC 60825-1 NOTE Harmonized as EN 60825-1
IEC 60825-2 NOTE Harmonized as EN 60825-2
IEC 61280-4-1 NOTE Harmonized as EN 61280-4-1
IEC 61300-3-2:2009 NOTE Harmonized as EN 61300-3-2:2009 (not modified)
IEC 60359:2001 NOTE Harmonized as EN 60359:2002 (not modified)
ISO/IEC 17025 NOTE Harmonized as EN ISO/IEC 17025

Annex ZA
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
Publication Year Title EN/HD Year
IEC 60793-2 -  Optical fibres - Part 2: Product EN 60793-2 -
specifications - General
IEC/TR 61931 1998 Fibre optic - Terminology - -
ISO/IEC Guide 98-3 2008 Uncertainty of measurement - Part 3: - -
Guide to the expression of uncertainty in
measurement (GUM:1995)
IEC 61315 ®
Edition 3.0 2019-03
Calibration of fibre-optic power meters

Étalonnage de wattmètres pour dispositifs à fibres optiques

ICS 33.140; 33.180.10 ISBN 978-2-8322-6640-3

– 2 – IEC 61315:2019 © IEC 2019
1 Scope . 7
2 Normative references . 7
3 Terms and definitions. 7
4 Preparation for calibration . 15
4.1 Organization. 15
4.2 Traceability . 15
4.3 Advice for measurements and calibrations . 15
4.4 Recommendations to users . 16
5 Absolute power calibration . 16
5.1 Calibration methods . 16
5.2 Establishing the calibration conditions . 17
5.3 Calibration procedure . 18
5.4 Calibration uncertainty . 19
5.4.1 General . 19
5.4.2 Uncertainty due to the setup . 19
5.4.3 Uncertainty of the reference meter . 20
5.4.4 Correction factors and uncertainty caused by the change of conditions . 21
5.4.5 Uncertainty due to the spectral bandwidths . 24
5.5 Reporting the results . 25
6 Measurement uncertainty of a calibrated power meter . 26
6.1 Overview . 26
6.2 Uncertainty at reference conditions . 26
6.3 Uncertainty at operating conditions . 26
6.3.1 General . 26
6.3.2 Determination of dependences on conditions . 27
6.3.3 Ageing . 28
6.3.4 Dependence on temperature . 28
6.3.5 Dependence on the power level (nonlinearity). 28
6.3.6 Dependence on the type of fibre or on the beam geometry . 29
6.3.7 Dependence on the connector-adapter combination . 30
6.3.8 Dependence on wavelength . 31
6.3.9 Dependence on spectral bandwidth . 32
6.3.10 Dependence on polarization . 32
6.3.11 Other dependences . 33
7 Nonlinearity calibration . 33
7.1 General . 33
7.2 Nonlinearity calibration based on superposition . 33
7.2.1 General . 33
7.2.2 Procedure . 34
7.2.3 Uncertainties. 35
7.3 Nonlinearity calibration based on comparison with a calibrated power meter . 36
7.3.1 General . 36
7.3.2 Procedure . 36

IEC 61315:2019 © IEC 2019 – 3 –
7.3.3 Uncertainties. 37
7.4 Nonlinearity calibration based on comparison with an attenuator . 37
7.5 Calibration of power meter for high power measurement . 37
Annex A (normative) Mathematical basis for measurement uncertainty calculations . 38
A.1 General . 38
A.2 Type A evaluation of uncertainty . 38
A.3 Type B evaluation of uncertainty . 39
A.4 Determining the combined standard uncertainty . 39
A.5 Reporting . 40
Annex B (informative) Linear to dB scale conversion of uncertainties . 41
B.1 Definition of decibel . 41
B.2 Conversion of relative uncertainties . 41
Bibliography . 42

Figure 1 – Typical spectral responsivity of photoelectric detectors . 13
Figure 2 – Example of a traceability chain . 14
Figure 3 – Measurement setup for sequential, fibre-based calibration . 17
Figure 4 – Change of conditions and uncertainty . 22
Figure 5 – Determining and recording an extension uncertainty . 27
Figure 6 – Possible subdivision of the optical reference plane into 10 × 10 squares, for
the measurement of the spatial response . 29
Figure 7 – Wavelength dependence of response due to Fabry-Perot type interference . 32
Figure 8 – Measurement setup of polarization dependent response . 32
Figure 9 – Nonlinearity calibration based on superposition . 34
Figure 10 – Measurement setup for nonlinearity calibration by comparison . 36

Table 1 – Calibration methods and correspondent typical power .

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