IEC TR 62316-2017 Guidance for the interpretation of OTDR backscattering traces for single-mode fibres《用于单模光纤ODTR后反射轨迹的说明指南》.pdf
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1、 IEC TR 62316 Edition 3.0 2017-07 TECHNICAL REPORT Guidance for the interpretation of OTDR backscattering traces for single-mode fibres IEC TR 62316:2017-07(en) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2017 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specifi
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10、ish to give us your feedback on this publication or need further assistance, please contact the Customer Service Centre: csciec.ch. IEC TR 62316 Edition 3.0 2017-07 TECHNICAL REPORT Guidance for the interpretation of OTDR backscattering traces for single-mode fibres INTERNATIONAL ELECTROTECHNICAL CO
11、MMISSION ICS 33.180.10 ISBN 978-2-8322-4553-8 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. colour inside 2 IEC TR 62316 IEC 2017 CONTENTS FOREWORD . 4 1 Scope 6 2 Normative references 6 3 T
12、erms and definitions 6 4 Backscattering phenomenon 6 4.1 Rayleigh scattering . 6 4.2 Fresnel reflections and dead zone fibres . 6 5 Measurement of the backscattered power (OTDR) . 7 5.1 General . 7 5.2 Representation of the backscattered power. 7 5.3 Noise and perturbations 8 6 Interpretation of a b
13、ackscattering trace 8 6.1 General . 8 6.2 Launch cord 9 6.3 Tail cord . 9 6.4 Unidirectional trace . 9 6.4.1 General . 9 6.4.2 Slope as the attenuation coefficient of a fibre 10 6.4.3 Impurity and discontinuity 10 6.4.4 Pulse width 10 6.4.5 Polarization effects 10 6.5 Bi-directional trace 11 6.5.1 G
14、eneral . 11 6.5.2 Attenuation uniformity 11 6.5.3 MFD uniformity 12 6.6 Splice loss evaluation . 12 6.6.1 General . 12 6.6.2 Event measurement methods . 13 6.6.3 Apparent losers and gainers 14 6.6.4 Example of apparent splice loss evaluation for uni-directional OTDR measurements . 17 7 Uncertainties
15、, deviation and resolution 18 7.1 General . 18 7.2 Attenuation coefficient measurements . 18 7.3 Fault locations 19 Bibliography 21 Figure 1 Unidirectional OTDR trace showing splice and/or macro bend loss. 9 Figure 2 Idealized unidirectional OTDR traces corresponding to a non-reflective splice betwe
16、en two fibres 13 Figure 3 OTDR traces for similar or different fibre types with different MFD and/or different backscatter properties . 14 Figure 4 Loss in unidirectional OTDR measurements as function of the MFD difference between two spliced fibres 15 IEC TR 62316 IEC 2017 3 Figure 5 Theoretical po
17、wer through splice loss due to MFD difference (with 1= 9m) . 16 a) Mean spice loss measured from B6 to B1.3 fibre 17 b) Mean spice loss measured from B1.3 to B6 fibre 18 Figure 6 Apparent cumulative unidirectional backscattering mismatch distribution for six splice combinations of B1.3 and B6 report
18、ed in Table 1 . 18 Figure 7 Schematic drawing of a fibre with two consecutive defects 1 and 2 19 Table 1 Summary for six fibre splice combinations of B1.3 and B6 based on popular 1 310 nm MFD fibre distributions 17 4 IEC TR 62316 IEC 2017 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ GUIDANCE FOR THE
19、INTERPRETATION OF OTDR BACKSCATTERING TRACES FOR SINGLE-MODE FIBRES 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 internati
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24、able 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
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