IEC TR 61282-14:2019
(Main)Fibre optic communication system design guidelines - Part 14: Determination of the uncertainties of attenuation measurements in fibre plants
Fibre optic communication system design guidelines - Part 14: Determination of the uncertainties of attenuation measurements in fibre plants
IEC TR 61282-14:2019 which is a Technical Report, establishes the detailed analysis and calculation of the uncertainties related to the measurement of the attenuation of both multimode and single mode optical fibre cabling using optical light sources and power meters. This second edition cancels and replaces the first edition published in 2016. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- in the title: replacement of "guide" by "guidelines";
- text adaptation to allow both standard grade B and reference grade connectors for termination of test cords;
- addition of values needed for calculation of uncertainties, when standard grade connectors are used, to Annex D;
- correction of minor inconsistencies in Equation (18) and after.
Keywords: measurement uncertainty of the attenuation of fibre optic cabling
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IEC TR 61282-14 ®
Edition 2.0 2019-07
TECHNICAL
REPORT
colour
inside
Fibre optic communication system design guidelines –
Part 14: Determination of the uncertainties of attenuation measurements in fibre
plants
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
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3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
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publications issued since 2002. Some entries have been
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further assistance, please contact the Customer Service
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IEC TR 61282-14 ®
Edition 2.0 2019-07
TECHNICAL
REPORT
colour
inside
Fibre optic communication system design guidelines –
Part 14: Determination of the uncertainties of attenuation measurements in fibre
plants
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.01 ISBN 978-2-8322-7069-1
– 2 – IEC TR 61282-14:2019 © IEC 2019
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms, definitions and abbreviated terms . 8
3.1 Terms and definitions . 8
3.2 Abbreviated terms . 10
4 Overview of uncertainty . 10
4.1 What is uncertainty? . 10
4.2 Origin of uncertainties . 11
4.3 What may not be considered as uncertainty? . 11
5 Fibre cabling attenuation measurement . 11
5.1 Test methods . 11
5.2 Sources of uncertainty to be considered . 11
5.2.1 Analysis . 11
5.2.2 Uncertainties due to the environment . 14
5.2.3 Uncertainties due to operator skills . 14
5.2.4 Uncertainties due to test methods . 14
5.2.5 Uncertainties due to measuring instruments . 14
5.2.6 Uncertainties due to the setup . 16
5.2.7 Uncertainties due to cabling. 16
6 Uncertainties estimation . 17
6.1 Measurement model. 17
6.2 Accumulation of uncertainties . 19
7 General representation of the equation using sensitivity coefficients . 19
8 Calculation . 23
8.1 Combined standard uncertainty . 23
8.2 Expanded uncertainty . 23
8.3 Determination of the coverage factor k . 23
8.3.1 General approach . 23
8.3.2 Discussion . 23
8.3.3 Typical values of degree of freedom . 24
Annex A (informative) Mathematical basis. 25
A.1 General . 25
A.2 Type A evaluation of uncertainty . 25
A.3 Type B evaluation of uncertainty . 25
A.4 Determining the combined standard uncertainty . 26
A.5 Reporting . 27
Annex B (informative) Test methods . 28
B.1 Test methods as per IEC 61280-4-1 and 61280-4-2 . 28
B.1.1 General . 28
B.1.2 Measurement configuration . 28
B.1.3 One-cord reference configuration . 28
B.1.4 Two-cord reference configuration . 29
B.1.5 Three-cord reference configuration . 29
B.2 Test methods defined in ISO/IEC 14763-3:2014 . 29
B.2.1 General . 29
B.2.2 Channels . 30
B.2.3 Links. 31
Annex C (informative) Uncertainties evaluation . 32
C.1 Type A uncertainties . 32
C.1.1 General . 32
C.1.2 Evaluation of optical source instability and associated uncertainties . 32
C.2 Type B uncertainties . 32
C.2.1 General . 32
C.2.2 Evaluation of the power meter noise . 32
C.2.3 Elements to be considered for power meter stability analysis . 33
C.2.4 Evaluation of the centre wavelength dependence . 33
C.2.5 Spectral width dependence . 35
C.2.6 Evaluation of the uncertainties due to MM launch conditions . 35
C.2.7 Evaluation of the PDL . 36
C.2.8 Uncertainty of absolute power measurement . 37
Annex D (informative) Typical values of uncertainties . 38
Annex E (informative) Linear to dB scale conversion of uncertainties . 40
E.1 Definition of decibel . 40
E.2 Conversion of relative uncertainties . 40
Bibliography . 41
Figure 1 – Fishbone analysis . 13
Figure 2 – Measurement model . 17
Figure B.1 – Measurement configuration . 28
Figure B.2 – One-cord reference measurement . 28
Figure B.3 – Two-cord reference measurement . 29
Figure B.4 – Three-cord reference measurement . 29
Figure B.5 – Measurement on channel . 30
Figure B.6 – Channel reference measurement . 30
Figure B.7 – Link measurement configuration . 31
Figure B.8 – Link reference measurement . 31
Figure C.1 – Typical spectral response of a fibre . 34
Figure C.2 – Uncertainties due to the launch conditions for a given loss . 36
Table 1 – Source of uncertainty (raw list) . 12
Table 2 – Uncertainties due to measuring instruments . 15
Table 3 – Uncertainties due to the setup . 16
Table 4 – Uncertainties due to cabling . 16
Table 5 – Sensitivity coefficients for IEC 61280-4-1 and IEC 61280-4-2 methods . 21
Table 6 – Sensitivity coefficients for ISO/IEC 14763-3:2014 methods. 22
Table 7 – Values of k for different values of ν . 24
Table 8 – Typical values of ν . 24
i
Table C.1 – Spectral attenuation coefficients . 34
– 4 – IEC TR 61282-14:2019 © IEC 2019
Table C.2 – Sensitivity coefficients . 35
Table D.1 – Typical values of uncertainties . 39
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC COMMUNICATION
SYSTEM DESIGN GUIDELINES –
Part 14: Determination of the uncertainties
of attenuation measurements in fibre plants
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 el
...
IEC TR 61282-14 ®
Edition 2.0 2019-07
REDLINE VERSION
TECHNICAL
REPORT
colour
inside
Fibre optic communication system design guidelines –
Part 14: Determination of the uncertainties of attenuation measurements in fibre
plants
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC TR 61282-14 ®
Edition 2.0 2019-07
REDLINE VERSION
TECHNICAL
REPORT
colour
inside
Fibre optic communication system design guidelines –
Part 14: Determination of the uncertainties of attenuation measurements in fibre
plants
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.01 ISBN 978-2-8322-7198-8
– 2 – IEC TR 61282-14:2019 RLV © IEC 2019
CONTENTS
FOREWORD . 5
INTRODUCTION . 2
1 Scope . 9
2 Normative references . 9
3 Terms, definitions and abbreviated terms . 9
3.1 Terms and definitions . 9
3.2 Abbreviated terms . 11
4 Overview of uncertainty . 11
4.1 What is uncertainty? . 11
4.2 Origin of uncertainties . 12
4.3 What may not be considered as uncertainty? . 12
5 Fibre cabling attenuation measurement . 12
5.1 Measurement Test methods . 12
5.2 Sources of uncertainty to be considered . 12
5.2.1 Analysis . 12
5.2.2 Uncertainties due to the environment . 15
5.2.3 Uncertainties due to operator skills . 15
5.2.4 Uncertainties due to measurement test methods . 15
5.2.5 Uncertainties due to measuring instruments . 15
5.2.6 Uncertainties due to the setup . 17
5.2.7 Uncertainties due to cabling. 17
6 Uncertainties estimation . 18
6.1 Measurement model. 18
6.2 Accumulation of uncertainties . 20
7 General representation of the equation using sensitivity coefficients . 20
8 Calculation . 24
8.1 Combined standard uncertainty . 24
8.2 Expanded uncertainty . 24
8.3 Determination of the coverage factor k . 24
8.3.1 General approach . 24
8.3.2 Discussion . 24
8.3.3 Typical values of degree of freedom . 25
Annex A (normative informative) Mathematical basis . 27
A.1 General . 27
A.2 Type A evaluation of uncertainty . 27
A.3 Type B evaluation of uncertainty . 28
A.4 Determining the combined standard uncertainty . 28
A.5 Reporting . 29
Annex B (informative) Measurement Test methods . 30
B.1 Measurement Test methods as per IEC 61280-4-1 and 61280-4-2 . 30
B.1.1 General . 30
B.1.2 Measurement configuration . 30
B.1.3 One-cord reference configuration . 30
B.1.4 Two-cord reference configuration . 31
B.1.5 Three-cord reference configuration . 31
B.2 Measurement Test methods as per defined in methods defined in
ISO/IEC 14763-3:2014 . 31
B.2.1 General . 31
B.2.2 Channels . 32
B.2.3 Links. 33
Annex C (normative informative) Uncertainties evaluation . 34
C.1 Type A uncertainties . 34
C.1.1 General . 34
C.1.2 Evaluation of optical source instability and associated uncertainties . 34
C.2 Type B uncertainties . 34
C.2.1 General . 34
C.2.2 Evaluation of the power meter noise . 34
C.2.3 Elements to be considered for power meter stability analysis . 35
C.2.4 Evaluation of the centre wavelength dependence . 35
C.2.5 Spectral width dependence . 37
C.2.6 Evaluation of the uncertainties due to MM launch conditions . 37
C.2.7 Evaluation of the PDL . 38
C.2.8 Uncertainty of absolute power measurement . 39
Annex D (normative informative) Typical values of uncertainties . 40
Annex E (informative) Linear to dB scale conversion of uncertainties . 42
E.1 Definition of decibel . 42
E.2 Conversion of relative uncertainties . 42
Bibliography . 43
Figure 1 – Fishbone analysis . 14
Figure 2 – Measurement model . 18
Figure B.1 – Measurement configuration . 30
Figure B.2 – One-cord reference measurement . 30
Figure B.3 – Two-cord reference measurement . 31
Figure B.4 – Three-cord reference measurement . 31
Figure B.5 – Measurement on channel . 32
Figure B.6 – Channel reference measurement . 32
Figure B.7 – Link measurement configuration . 33
Figure B.8 – Link reference measurement . 33
Figure C.1 – Typical spectral response of a fibre . 36
Figure C.2 – Uncertainties due to the launch conditions for a given loss . 38
Table 1 – Source of uncertainty (raw list) . 13
Table 2 – Uncertainties due to measuring instruments . 16
Table 3 – Uncertainties due to the setup . 17
Table 4 – Uncertainties due to cabling . 17
Table 5 – Sensitivity coefficients for IEC 61280-4-1 and IEC 61280-4-2 methods . 22
Table 6 – Sensitivity coefficients for ISO/IEC 14763-3:2014 methods. 23
Table 7 – Values of k for different values of ν . 25
Table 8 – Typical values of ν . 26
i
– 4 – IEC TR 61282-14:2019 RLV © IEC 2019
Table C.1 – Spectral attenuation coefficients . 36
Table C.2 – Sensitivity coefficients . 37
Table D.1 – Typical values of uncertainties . 40
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC COMMUNICATION
SYSTEM DESIGN GUIDES GUIDELINES –
Part 14: Determination of the uncertainties
of attenuation measurements in fibre plants
FOREWORD
1) The International Electrotechnical Commiss
...
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