IEC TR 61282-14:2016
(Main)Fibre optic communication system design guides - Part 14: Determination of the uncertainties of attenuation measurements in fibre plants
Fibre optic communication system design guides - Part 14: Determination of the uncertainties of attenuation measurements in fibre plants
IEC TR 61282-14:2016 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. Keywords: measurement uncertainty of the attenuation of fibre optic cabling The contents of the corrigendum of April 2016 have been included in this copy.
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IEC TR 61282-14 ®
Edition 1.0 2016-01
TECHNICAL
REPORT
colour
inside
Fibre optic communication system design guides –
Part 14: Determination of the uncertainties of attenuation measurements in fibre
plants
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IEC TR 61282-14 ®
Edition 1.0 2016-01
TECHNICAL
REPORT
colour
inside
Fibre optic communication system design guides –
Part 14: Determination of the uncertainties of attenuation measurements in fibre
plants
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.01 ISBN 978-2-8322-3111-1
– 2 – IEC TR 61282-14:2016 © IEC 2016
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms, definitions and abbreviations . 8
3.1 Terms and definitions . 8
3.2 Abbreviations . 10
4 Overview of uncertainty . 10
4.1 What is uncertainty? . 10
4.2 Origin of uncertainties . 10
4.3 What may not be considered as uncertainty? . 10
5 Fibre cabling attenuation measurement . 11
5.1 Measurement 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 measurement 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 . 18
7 General representation of the equation using sensitivity coefficients . 19
8 Calculation . 22
8.1 Combined standard uncertainty . 22
8.2 Expanded uncertainty . 22
8.3 Determination of the coverage factor k . 22
8.3.1 General approach . 22
8.3.2 Discussion . 22
8.3.3 Typical values of degree of freedom . 23
Annex A (normative) Mathematical basis . 24
A.1 General . 24
A.2 Type A evaluation of uncertainty . 24
A.3 Type B evaluation of uncertainty . 24
A.4 Determining the combined standard uncertainty . 25
A.5 Reporting . 26
Annex B (informative) Measurement methods . 27
B.1 Measurement methods as per IEC 61280-4-1 and 61280-4-2 . 27
B.1.1 General . 27
B.1.2 Measurement configuration . 27
B.1.3 One-cord reference configuration . 27
B.1.4 Two-cord reference configuration . 28
B.1.5 Three-cord reference configuration . 28
B.2 Measurement methods as per ISO/IEC 14763-3:2014 . 28
B.2.1 General . 28
B.2.2 Channels . 29
B.2.3 Links. 30
Annex C (normative) Uncertainties evaluation . 31
C.1 Type A uncertainties . 31
C.1.1 General . 31
C.1.2 Evaluation of optical source instability and associated uncertainties . 31
C.2 Type B uncertainties . 31
C.2.1 General . 31
C.2.2 Evaluation of the power meter noise . 31
C.2.3 Elements to be considered for power meter stability analysis . 32
C.2.4 Evaluation of the centre wavelength dependence . 32
C.2.5 Spectral width dependence . 34
C.2.6 Evaluation of the uncertainties due to MM launch conditions . 34
C.2.7 Evaluation of the PDL . 35
C.2.8 Uncertainty of absolute power measurement . 36
Annex D (normative) Typical values of uncertainties . 37
Annex E (informative) Linear to dB scale conversion of uncertainties . 38
E.1 Definition of decibel . 38
E.2 Conversion of relative uncertainties . 38
Bibliography . 39
Figure 1 – Fish bone analysis . 13
Figure 2 – Measurement model . 17
Figure B.1 – Measurement configuration . 27
Figure B.2 – One-cord reference measurement . 27
Figure B.3 – Two-cord reference measurement . 28
Figure B.4 – Three-cord reference measurement . 28
Figure B.5 – Measurement on channel . 29
Figure B.6 – Channel reference measurement . 29
Figure B.7 – Link measurement configuration . 30
Figure B.8 – Link reference measurement . 30
Figure C.1 – Typical spectral response of a fibre . 33
Figure C.2 – Uncertainties due to the launch conditions for a given loss . 35
Table 1 – Source of uncertainty (raw list) . 11
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 . 20
Table 6 – Sensitivity coefficients for ISO/IEC 14763-3:2014 methods. 21
Table 7 – Values of k for different values of n . 23
Table 8 – Typical values of n . 23
i
Table C.1 – Spectral attenuation coefficients . 33
– 4 – IEC TR 61282-14:2016 © IEC 2016
Table C.2 – Sensitivity coefficients . 33
Table D.1 – Typical values of uncertainties . 37
INTERNATIONAL ELECTROTECHNICAL COMMISSION
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FIBRE OPTIC COMMUNICATION SYSTEM DESIGN GUIDES –
Part 14:
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