1、Fibre optic communication system design guidesPart 14: Determination of the uncertainties of attenuation measurements in fibre plantsPD IEC/TR 61282-14:2016Incorporating corrigendum April 2016BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06National forewordT h i s P
2、u b l i s h e d D o c u m e n t i s t h e U K i m p l e m e n t a t i o n o f I E C / T R61282-14:2016, incorporating corrigendum April 2016.The UK participation in its preparation was entrusted by TechnicalCommittee GEL/86, Fibre optics, to Subcommittee GEL/86/3, Fibre optic systems and active devi
3、ces.A list of organizations represented on this subcommittee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2016.Published by BSI
4、Standards Limited 2016ISBN 978 0 580 94415 4ICS 33.180.01Compliance with a British Standard cannot confer immunity fromlegal obligations.This Published Document was published under the authority of theStandards Policy and Strategy Committee on 31 January 2016.Amendments/corrigenda issued since publi
5、cationDate Text affectedPUBLISHED DOCUMENTPD IEC/TR 61282-14:201631 May 2016 Implementation of IEC corrigendum April 2016: Table C.1 updatedIEC TR 61282-14 Edition 1.0 2016-01 TECHNICAL REPORT Fibre optic communication system design guides Part 14: Determination of the uncertainties of attenuation m
6、easurements in fibre plants INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 33.180.01 ISBN 978-2-8322-3111-1 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. colourinsidePD IEC/TR 61282-14:2016 2
7、 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
8、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
9、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
10、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
11、 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
12、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 PD IEC/TR 61282-14:2016IEC TR 61282-14:2016 IEC 2016 3 B.2 Measurement methods as per ISO/IEC 14763-3:2014 . 28 B.2.1 General . 28 B.2.2 Channe
13、ls . 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 E
14、lements 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 measur
15、ement . 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
16、 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
17、. 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 t
18、o 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 k95for different values of n 23 Table 8 Typical values of ni. 23 Table C.1 S
19、pectral attenuation coefficients 33 PD IEC/TR 61282-14:2016 4 IEC TR 61282-14:2016 IEC 2016 Table C.2 Sensitivity coefficients . 33 Table D.1 Typical values of uncertainties . 37 PD IEC/TR 61282-14:2016IEC TR 61282-14:2016 IEC 2016 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ FIBRE OPTIC COMMUNICAT
20、ION SYSTEM DESIGN GUIDES 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 Committee
21、s). 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
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25、l 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
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27、 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 the
28、y 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 w
29、hatsoever, 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 pub
30、lications 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. The main task o
31、f IEC technical committees is to prepare International Standards. However, a technical committee may propose the publication of a technical report when it has collected data of a different kind from that which is normally published as an International Standard, for example “state of the art“. IEC 61
32、282-14, which is a technical report, has been prepared by subcommittee 86C: Fibre optic systems and active devices, of IEC technical committee 86: Fibre optics. This publication contains an attached file titled, “Supplemental Data for Section 8”, in the form of an Excel spread sheet. This file is in
33、tended to be used as a complement and does not form an integral part of the standard. PD IEC/TR 61282-14:2016 6 IEC TR 61282-14:2016 IEC 2016 The text of this technical report is based on the following documents: Enquiry draft Report on voting 86C/1339/DTR 86C/1351/RVC Full information on the voting
34、 for the approval of this technical report can be found in the report on voting indicated in the above table. A list of all parts in the IEC 61282 series, published under the general title Fibre-optic communication system design guides, can be found on the IEC website. This publication has been draf
35、ted in accordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publicat
36、ion will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. 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 co
37、rrect understanding of its contents. Users should therefore print this document using a colour printer. PD IEC/TR 61282-14:2016IEC TR 61282-14:2016 IEC 2016 7 INTRODUCTION The determination of the uncertainty of every measurement is a key activity, which should be performed by applying dedicated met
38、hods as extensively presented in reference documents such as ISO/IEC Guide 98-3:2008, Guide to the uncertainty of measurement (GUM). This Technical Report shows a practical application of these methods for the determination of the measurement uncertainty of the attenuation of fibre optic cabling usi
39、ng optical light sources and power meters as defined in IEC 61280-4-1 and IEC 61280-4-2. It includes the review of all contributing factors to uncertainty (such as launch conditions, spectral width, stability of source, power meter polarization, resolution, linearity, quality of test cord reference
40、connectors, etc.) to determine the overall measurement uncertainty. The Technical Report applies to the measurement of single mode or multimode fibres without restrictions to the fibre parameters, including mode field diameter, core diameter and numerical aperture. However, numerical values given in
41、 Clause C.2 and typical values given in Annex D are not valid for multimode fibres types A2, A3 and A4. The list of uncertainties presented in this Technical Report is related to this particular application and should be reconsidered if measurement conditions are not compliant to measurement require
42、ments defined by IEC 61280-4-1 and 61280-4-2. The reference document for general uncertainty calculations is ISO/IEC Guide 98-3:2008, and this report does not intend to replace it; it only represents an example and should be used in conjunction with ISO/IEC Guide 98-3:2008. A brief introduction to t
43、he determination of measurement uncertainty according to ISO/IEC Guide 98-3:2008 is given in Annex A. This Technical Report is associated with a calculation spreadsheet (Excel) containing practical calculations. PD IEC/TR 61282-14:2016 8 IEC TR 61282-14:2016 IEC 2016 FIBRE OPTIC COMMUNICATION SYSTEM
44、 DESIGN GUIDES Part 14: Determination of the uncertainties of attenuation measurements in fibre plants 1 Scope This part of IEC 61282, which is a Technical Report, establishes the detailed analysis and calculation of the uncertainties related to the measurement of the attenuation of both multimode a
45、nd single mode optical fibre cabling using optical light sources and power meters. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For und
46、ated references, the latest edition of the referenced document (including any amendments) applies. IEC 61280-4-1:2009, Fibre-optic communication subsystem test procedures Part 4-1: Installed cable plant Multimode attenuation measurement IEC 61280-4-2:2014, Fibre-optic communication subsystem test pr
47、ocedures Part 4-2: Installed cable plant Single-mode attenuation and optical return loss measurement ISO/IEC Guide 98-3:2008, Uncertainty of measurement Part 3 Guide to the expression of uncertainty in measurement (GUM:1995) 3 Terms, definitions and abbreviations 3.1 Terms and definitions For the pu
48、rposes of this document, the following terms and definitions apply. 3.1.1 attenuation L reduction of optical power induced by transmission through a medium such as cabling, given as L (dB) LdB= 10 log10(Pin/Pout) where Pinand Poutare the power, typically measured in mW, into and out of the cabling 3
49、.1.2 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 standards PD IEC/TR 61282-14:2016IEC TR 61282-14:2016 IEC 2016 9 3.1.3 encircled flux EF fraction of the radial-weighted cumulative near field power to the total radial-weighted output power as a function of radial distance from the optical centre
