IEC TR 61282-14:2024
(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 61282-14:2024, which is a Technical Report, establishes a detailed analysis and calculations 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. It also includes simplified analysis and calculation of the uncertainties related to the measurement of the attenuation of single-mode optical fibre cabling using OTDRs. This document contains an attached file in the form of an Excel spreadsheet. This file is intended to be used as a complement and does not form an integral part of the document. This third edition cancels and replaces the second edition published in 2019. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) addition of uncertainties calculation for optical time domain reflectometer (OTDR) measurement methods based on the analysis provided in 61280-4-3;
b) addition of uncertainties calculation for passive optical networks (PON);
c) update of the list of reference grade connectors;
d) addition of probability distribution in Table D.1.
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IEC TR 61282-14 ®
Edition 3.0 2024-04
TECHNICAL
REPORT
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
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CH-1211 Geneva 20 www.iec.ch
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The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
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IEC TR 61282-14 ®
Edition 3.0 2024-04
TECHNICAL
REPORT
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 978-2-8322-8827-6
– 2 – IEC TR 61282-14:2024 © IEC 2024
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 could 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 Light source power meter measurement methods . 17
6.1.1 Measurement model . 17
6.1.2 Accumulation of uncertainties . 19
6.2 OTDR methods . 20
6.2.1 Measurement model for unidirectional methods . 20
6.2.2 OTDR bidirectional measurements . 21
7 General representation of the formula using sensitivity coefficients . 24
8 Calculation . 28
8.1 Combined standard uncertainty . 28
8.2 Expanded uncertainty . 28
8.3 Determination of the coverage factor k . 28
8.3.1 General approach . 28
8.3.2 Discussion . 28
8.3.3 Typical values of degree of freedom . 29
Annex A (informative) Mathematical basis. 31
A.1 General . 31
A.2 Type A evaluation of uncertainty . 31
A.3 Type B evaluation of uncertainty . 32
A.4 Determining the combined standard uncertainty . 32
A.5 Reporting . 33
Annex B (informative) Test methods . 34
B.1 LSPM test methods as per IEC 61280-4-1 and 61280-4-2 . 34
B.1.1 General . 34
B.1.2 Measurement configuration . 34
B.1.3 One-cord reference configuration . 34
B.1.4 Two-cord reference configuration . 35
B.1.5 Three-cord reference configuration . 35
B.1.6 Equipment cord reference configuration . 35
B.2 OTDR Test methods as per IEC 61280-4-2 and 61280-4-3 . 35
B.2.1 Unidirectional measurement . 35
B.2.2 Bi-directional measurement . 36
B.2.3 OTDR test method on PON . 36
B.2.4 Filtered OTDR on PON . 37
B.3 Test methods defined in ISO/IEC 14763-3 . 38
B.3.1 General . 38
B.3.2 Channels . 39
B.3.3 Links. 40
Annex C (informative) Evaluation of uncertainties . 41
C.1 Type A uncertainties . 41
C.1.1 General . 41
C.1.2 Evaluation of optical source instability and associated uncertainties . 41
C.2 Type B uncertainties . 41
C.2.1 General . 41
C.2.2 Evaluation of the power meter noise . 42
C.2.3 Elements to be considered for power meter stability analysis . 42
C.2.4 Evaluation of the centre wavelength dependence (LS or OTDR) . 42
C.2.5 Spectral width dependence . 45
C.2.6 Evaluation of the uncertainties due to MM launch conditions . 45
C.2.7 Evaluation of the PDL . 46
C.2.8 Uncertainty of absolute power measurement of power meters . 47
C.2.9 Relative uncertainty arising from non-linearity of the OTDR . 47
C.2.10 Uncertainty arising from OTDR noise . 47
C.2.11 Practical determination of uncertainty arising from OTDR noise . 50
C.2.12 Relative uncertainty arising from OTDR cursor placement . 53
C.2.13 Considerations on backscatter coefficient . 54
Annex D (informative) Typical values of uncertainties . 55
Annex E (informative) Linear to dB scale conversion of uncertainties . 58
E.1 Definition of decibel . 58
E.2 Conversion of relative uncertainties . 58
Bibliography . 60
Figure 1 – Fishbone analysis . 13
Figure 2 – Measurement model for light source and power meter . 17
Figure 3 – Measurement model for OTDRs . 21
Figure B.1 – Measurement configuration . 34
Figure B.2 – One-cord reference measurement . 34
Figure B.3 – Two-cord reference measurement . 35
Figure B.4 – Three-cord reference measurement . 35
Figure B.5 – Equipment cord reference measurement . 35
Figure B.6 – Location of the cabling under test ports . 36
Figure B.7 – Graphic determination of F and F . 37
1 2
– 4 – IEC TR 61282-14:2024 © IEC 2024
Figure B.8 – Graphic determination of F and F . 38
1 2
Figure B.9 – Channel measurement configuration . 39
Figure B.10 – Channel reference measurement . 39
Figure B.11 – Link measurement configuration . 40
Figure B.12 – Link reference measurement . 40
Figure C.1 – Typical spectral response of a fibre .
...
IEC TR 61282-14 ®
Edition 3.0 2024-04
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 Secretariat 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 IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews, graphical symbols and the glossary.
committee, …). It also gives information on projects, replaced With a subscription you will always have access to up to date
and withdrawn publications. content tailored to your needs.
IEC Just Published - webstore.iec.ch/justpublished
Electropedia - www.electropedia.org
Stay up to date on all new IEC publications. Just Published
The world's leading online dictionary on electrotechnology,
details all new publications released. Available online and once
containing more than 22 500 terminological entries in English
a month by email.
and French, with equivalent terms in 25 additional languages.
Also known as the International Electrotechnical Vocabulary
IEC Customer Service Centre - webstore.iec.ch/csc
(IEV) online.
If you wish to give us your feedback on this publication or need
further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC TR 61282-14 ®
Edition 3.0 2024-04
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 978-2-8322-8867-2
– 2 – IEC TR 61282-14:2024 RLV © IEC 2024
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 . 11
4.1 What is uncertainty? . 11
4.2 Origin of uncertainties . 11
4.3 What may could 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 . 12
5.2.1 Analysis . 12
5.2.2 Uncertainties due to the environment . 16
5.2.3 Uncertainties due to operator skills . 16
5.2.4 Uncertainties due to test methods . 16
5.2.5 Uncertainties due to measuring instruments . 16
5.2.6 Uncertainties due to the setup . 18
5.2.7 Uncertainties due to cabling. 18
6 Uncertainties estimation . 19
6.1 Light source power meter measurement methods . 19
6.1.1 Measurement model . 19
6.1.2 Accumulation of uncertainties . 22
6.2 OTDR methods . 23
6.2.1 Measurement model for unidirectional methods . 23
6.2.2 OTDR bidirectional measurements . 24
7 General representation of the formula using sensitivity coefficients . 27
8 Calculation . 32
8.1 Combined standard uncertainty . 32
8.2 Expanded uncertainty . 32
8.3 Determination of the coverage factor k . 32
8.3.1 General approach . 32
8.3.2 Discussion . 32
8.3.3 Typical values of degree of freedom . 33
Annex A (informative) Mathematical basis. 35
A.1 General . 35
A.2 Type A evaluation of uncertainty . 35
A.3 Type B evaluation of uncertainty . 36
A.4 Determining the combined standard uncertainty . 36
A.5 Reporting . 37
Annex B (informative) Test methods . 38
B.1 LSPM test methods as per IEC 61280-4-1 and 61280-4-2 . 38
B.1.1 General . 38
B.1.2 Measurement configuration . 38
B.1.3 One-cord reference configuration . 38
B.1.4 Two-cord reference configuration . 39
B.1.5 Three-cord reference configuration . 39
B.1.6 Equipment cord reference configuration . 39
B.2 OTDR Test methods as per IEC 61280-4-2 and 61280-4-3 . 39
B.2.1 Unidirectional measurement . 39
B.2.2 Bi-directional measurement . 40
B.2.3 OTDR test method on PON . 40
B.2.4 Filtered OTDR on PON . 41
B.3 Test methods defined in ISO/IEC 14763-3:2014 . 42
B.3.1 General . 42
B.3.2 Channels . 43
B.3.3 Links. 44
Annex C (informative) Evaluation of uncertainties . 45
C.1 Type A uncertainties . 45
C.1.1 General . 45
C.1.2 Evaluation of optical source instability and associated uncertainties . 45
C.2 Type B uncertainties . 45
C.2.1 General . 45
C.2.2 Evaluation of the power meter noise . 46
C.2.3 Elements to be considered for power meter stability analysis . 46
C.2.4 Evaluation of the centre wavelength dependence (LS or OTDR) . 46
C.2.5 Spectral width dependence . 49
C.2.6 Evaluation of the uncertainties due to MM launch conditions . 49
C.2.7 Evaluation of the PDL . 50
C.2.8 Uncertainty of absolute power measurement of power meters . 51
C.2.9 Relative uncertainty arising from non-linearity of the OTDR . 51
C.2.10 Uncertainty arising from OTDR noise . 52
C.2.11 Practical determination of uncertainty arising from OTDR noise . 54
C.2.12 Relative uncertainty arising from OTDR cursor placement . 57
C.2.13 Considerations on backscatter coefficient . 58
Annex D (informative) Typical values of uncertainties . 59
Annex E (informative) Linear to dB scale conversion of uncertainties . 63
E.1 Definition of decibel . 63
E.2 Conversion of relative uncertainties . 63
Bibliography . 65
Figure 1 – Fishbone analysis . 15
Figure 2 – Measurement model for light source and power meter . 19
Figure 3 – Measurement model for OTDRs . 23
Figure B.1 – Measurement configuration . 38
Figure B.2 – One-cord reference measurement . 38
Figure B.3 – Two-cord reference measurement . 39
Figure B.4 – Three-cord reference measurement . 39
Figure B.5 – Equipment cord reference measurement . 39
Figure B.6 – Location of the cabling under test ports . 40
Figure B.7 – Graphic determination of F and F . 41
1 2
– 4 – IEC TR 61282-14:2024 RLV © IEC 2024
Figure B.8 – Graphic determination of F and F . 42
1 2
Figure B.9 – Measurement on channel Channel measurement configuration . 43
Figure B.10 – Channel reference measurement . 43
Figure B.11 – Link measurement configuration . 44
Figure B.12 – Link reference measurement . 44
Figure C.1 – Typical spectral response of a fibre . 47
Figure C.2 – Observed PLC splitter waveleng
...
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