SIST EN IEC 61315:2019

SLOVENSKI STANDARD
SIST EN IEC 61315:2019
01-julij-2019
Nadomešča:
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
ICS:
33.140 Posebna merilna oprema za Special measuring
uporabo v telekomunikacijah equipment for use in
telecommunications
33.180.10 (Optična) vlakna in kabli Fibres and cables
SIST EN IEC 61315:2019 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 61315:2019

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SIST EN IEC 61315:2019


EUROPEAN STANDARD EN IEC 61315

NORME EUROPÉENNE

EUROPÄISCHE NORM
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

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SIST EN IEC 61315:2019
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
EN IEC 61315:2019.
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
indicated:
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


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EN IEC 61315:2019 (E)
Annex ZA
(normative)

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)
applies.
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:
www.cenelec.eu.
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)


3

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SIST EN IEC 61315:2019




IEC 61315

®


Edition 3.0 2019-03




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE
colour

inside










Calibration of fibre-optic power meters



Étalonnage de wattmètres pour dispositifs à fibres optiques



















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




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




Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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CONTENTS
FOREWORD . 4
INTRODUCTION . 6
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

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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 . 16
Table 2 – Nonlinearity . 35

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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

CALIBRATION OF FIBRE-OPTIC POWER METERS

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization 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 International 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 participate 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 between 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 Publications 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
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 national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition 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 direct 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
indispensable 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 61315 has been prepared by IEC technical committee 86: Fibre
optics.
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.

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IEC 61315:2019 © IEC 2019 – 5 –
The text of this International Standard is based on the following documents:
CDV Report on voting
86/533/CDV 86/540A/RVC

Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
In this document, the following print types are used:
– terms defined in the document: in italic type.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.

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INTRODUCTION
Fibre-optic power meters are designed to measure optical power from fibre-optic sources as
accurately as possible. This capability depends largely on the quality of the calibration process.
In contrast to other types of measuring equipment, the measurement results of fibre-optic
power meters usually depend on many conditions of measurement. The conditions of
measurement during the calibration process are called calibration conditions. Their precise
description is therefore an integral part of the calibration.
This document defines all of the steps involved in the calibration process: establishing the
calibration conditions, carrying out the calibration, calculating the uncertainty, and reporting the
uncertainty, the calibration conditions and the traceability.
The absolute power calibration describes how to determine the ratio between the value of the
input power and the power meter's result. This ratio is called correction factor. The
measurement uncertainty of the correction factor is combined following Annex A from
uncertainty contributions from the reference meter, the test meter, the setup and the
procedure.
The calculations go through detailed characterizations of individual uncertainties. It is important
to know that
a) some uncertainties are type B estimations, experience-based,
b) a detailed uncertainty analysis is usually only done once for each power meter type under
test, and all subsequent calibrations are usually based on this one-time analysis, using the
appropriate type A measurement contributions evaluated at the time of the calibration, and
c) some of the individual uncertainties are simply considered to be part of a checklist, with an
actual value which can be neglected.
Clause 5 defines absolute power calibration, which is mandatory for calibration reports
referring to this document.
Clause 6 describes the evaluation of the measurement uncertainty of a calibrated power meter
operated within reference conditions or within operating conditions. It depends on the
calibration uncertainty of the power meter as calculated in 5.4, the conditions and its
dependence on the conditions. It is usually performed by manufacturers in order to establish
specifications and is not mandatory for reports referring to this document. One of these
dependences, the nonlinearity, is determined in a separate calibration (Clause 7).

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CALIBRATION OF FIBRE-OPTIC POWER METERS



1 Scope
This document 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.
2 Normative references
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) applies.
IEC 60793-2, Optical fibres – Part 2: Product 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)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC TR 61931 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
accredited calibration laboratory
calibration laboratory authorized by the appropriate national organization to issue calibration
certificates with a minimum specified uncertainty, which demonstrate traceability to national
standards (3.14)
3.2
adjustment
set of operations carried out on an instrument in order that it provides given indications
corresponding to given values of the measurand
Note 1 to entry: When the instrument is made to give a null indication corresponding to a null value of the
measurand, the set of operations is called zero adjustment.
Note 2 to entry: For more information, see ISO/IEC Guide 99:2007, 3.11.
[SOURCE: IEC 60050-311:2001, 311-03-16, modified – The words "of a measuring instrument"
have been deleted from the term, and Note 2 to entry has been added.]

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3.3
calibration
set of operations that establish, under specified conditions, the relationship between the values
of quantities indicated by a measuring instrument and the corresponding values realized by
measurement standards
Note 1 to entry: The result of a calibration permits either the assignment of values of measurands to the
indications or the determination of corrections with respect to indications.
Note 2 to entry: A calibration may also determine other metrological properties such as the effect of influence
quantities.
Note 3 to entry: The result of a calibration may be recorded in a document, sometimes called a calibration
certificate or a calibration report.
Note 4 to entry: See also ISO/IEC Guide 99:2007, 2.39.
3.4
calibration conditions
conditions of measurement in which the calibration is performed
3.5
centroidal wavelength
λ
c
power-weighted mean wavelength of a light source in vacuum
Note 1 to entry: For a continuous spectrum, the centroidal wavelength is defined as:
p λ λdλ
( )
∫
λ = (1)
c
P
total
For a spectrum consisting of discrete lines, the centroidal wavelength is defined as:
Pλ
ii
∑
i
λ = (2)
c
P
∑ i
i
where
p(λ) is the power spectral density of the source, for example, in W/nm;
th
λ is the vacuum wavelength of the i discrete line;
i
th
P is the power of the i discrete line, for example, in W;
i
P is the total power, for example, in W.
total
Note 2 to entry: The above integrals and summations theoretically extend over the entire spectrum of the light
source. However, it is usually sufficient to perform the integral or summation over the spectrum where the spectral
density p(λ) or power P is higher than 0,1 % of the maximum spectral density p(λ) or power P .
i i
3.6
correction factor
CF
numerical factor by which the uncorrected result of a measurement is multiplied to compensate
for systematic error
Note 1 to entry: This note applies to the French language only.

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3.7
detector
element of the power meter that transduces the radiant optical power into a measurable,
usually electrical, quantity
Note 1 to entry: In this document, the detector is assumed to be connected with the optical input port by an optical
path.
Note 2 to entry: For more information, see ISO/IEC Guide 99:2007, 3.9.
3.8
deviation
D
relative difference between the power measured by the test meter (3.32) P and the
DUT
reference power P :
ref
PP−
DUT ref
D= (3)
P
ref
Note 1 to entry: This note applies to the French language only.
3.9
excitation
description of the distribution of optical power between the modes in the fibre
Note 1 to entry: In context with multimode fibres, the fibre excitation is described by
a) the spot diameter (3.31) on the surface of the fibre end, and
b) the numerical aperture (3.17) of the radiation emitted from the fibre.
Single-mode fibres are generally assumed to be excited by only one mode (the fundamental mode).
3.10
instrument state
set of parameters that can be chosen on an instrument
Note 1 to entry: Typical parameters of the instrument state are the optical power range, the wavelength setting,
the display measurement unit and the output from which the measurement result is obtained (for example, display,
interface bus, analogue output).
3.11
irradiance
quotient of the incremental radiant power ∂P incident on an element of the reference plane by
the incremental area ∂A of that element:
∂P
2
E= W/m (4)
( )
∂A
[Note 1 to entry: For more information, see IEC TR 61931:1998, 2.1.15.
3.12
measurement result
y
(displayed or electrical) output of a power meter (or standard), after completing all actions
suggested by the operating instructions, for example warm-up, zero adjustment and
wavelength-correction
Note 1 to entry: Measurement result is expressed in watts (W). For the purposes of uncertainty, measurement
results in other units, for example volts, should be converted to watts. Measurement results in decibels (dB) should

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also be converted to watts, because the entire uncertainty accumulation is based on measurement results
expressed in watts. See Annex B.
3.13
measuring range
set of values of measurands for which the error of a measuring instrument is intended to lie
within specified limits
Note 1 to entry: In this document, the measuring range is the range of radiant power (part of the operating range),
for which the uncertainty at operating conditions is specified. The term "dynamic range
...