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BSI PD IEC/TR 62316:2017

BSI PD IEC/TR 62316:2017

$142.49

Guidance for the interpretation of OTDR backscattering traces for single-mode fibres

Published By Publication Date Number of Pages
BSI 2017 24
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IEC 62316, which is a Technical Report, aims to provide guidelines for the interpretation of backscattering traces, as obtained by traditional optical time domain reflectometers (OTDRs) – not including polarization OTDRs – for single-mode fibres. Also, backscattered power effects are discussed in case of unidirectional trace.

Full description of the test measurement procedure can be found in Annex C of IEC 60793-1-40:2001.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 CONTENTS
6 FOREWORD
8 1 Scope
2 Normative references
3 Terms and definitions
4 Backscattering phenomenon
4.1 Rayleigh scattering
4.2 Fresnel reflections and dead zone fibres
9 5 Measurement of the backscattered power (OTDR)
5.1 General
5.2 Representation of the backscattered power
10 5.3 Noise and perturbations
6 Interpretation of a backscattering trace
6.1 General
11 6.2 Launch cord
6.3 Tail cord
6.4 Unidirectional trace
6.4.1 General
Figure 1 – Unidirectional OTDR trace showing splice and/or macro bend loss
12 6.4.2 Slope as the attenuation coefficient of a fibre
6.4.3 Impurity and discontinuity
6.4.4 Pulse width
6.4.5 Polarization effects
13 6.5 Bi-directional trace
6.5.1 General
6.5.2 Attenuation uniformity
14 6.5.3 MFD uniformity
6.6 Splice loss evaluation
6.6.1 General
15 6.6.2 Event measurement methods
Figure 2 – Idealized unidirectional OTDR traces corresponding toa non-reflective splice between two fibres
16 6.6.3 Apparent losers and gainers
Figure 3 – OTDR traces for similar or different fibre types withdifferent MFD and/or different backscatter properties
17 Figure 4 – Loss in unidirectional OTDR measurements as function ofthe MFD difference between two spliced fibres
18 Figure 5 – Theoretical power through splice loss due to MFD difference (with (1 = 9µm)
19 6.6.4 Example of apparent splice loss evaluation for uni-directional OTDR measurements
Table 1 – Summary for six fibre splice combinations of B1.3 and B6based on popular 1 310 nm MFD fibre distributions
20 7 Uncertainties, deviation and resolution
7.1 General
7.2 Attenuation coefficient measurements
Figure 6 – Apparent cumulative unidirectional backscattering mismatch distribution for six splice combinations of B1.3 and B6 reported in Table 1
21 7.3 Fault locations
Figure 7 – Schematic drawing of a fibre with twoconsecutive defects 1 and 2
23 Bibliography

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BSI PD IEC/TR 62316:2017
$142.49