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) \u2013 not including polarization OTDRs \u2013 for single-mode fibres. Also, backscattered power effects are discussed in case of unidirectional trace.<\/p>\n
Full description of the test measurement procedure can be found in Annex C of IEC 60793-1-40:2001.<\/p>\n
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| 2<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 4<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions 4 Backscattering phenomenon 4.1 Rayleigh scattering 4.2 Fresnel reflections and dead zone fibres <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 5 Measurement of the backscattered power (OTDR) 5.1 General 5.2 Representation of the backscattered power <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 5.3 Noise and perturbations 6 Interpretation of a backscattering trace 6.1 General <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 6.2 Launch cord 6.3 Tail cord 6.4 Unidirectional trace 6.4.1 General Figure 1 \u2013 Unidirectional OTDR trace showing splice and\/or macro bend loss <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 6.5 Bi-directional trace 6.5.1 General 6.5.2 Attenuation uniformity <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 6.5.3 MFD uniformity 6.6 Splice loss evaluation 6.6.1 General <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 6.6.2 Event measurement methods Figure 2 \u2013 Idealized unidirectional OTDR traces corresponding toa non-reflective splice between two fibres <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 6.6.3 Apparent losers and gainers Figure 3 \u2013 OTDR traces for similar or different fibre types withdifferent MFD and\/or different backscatter properties <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | Figure 4 \u2013 Loss in unidirectional OTDR measurements as function ofthe MFD difference between two spliced fibres <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | Figure 5 \u2013 Theoretical power through splice loss due to MFD difference (with (1 = 9\u00b5m) <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 6.6.4 Example of apparent splice loss evaluation for uni-directional OTDR measurements Table 1 \u2013 Summary for six fibre splice combinations of B1.3 and B6based on popular 1 310 nm MFD fibre distributions <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 7 Uncertainties, deviation and resolution 7.1 General 7.2 Attenuation coefficient measurements Figure 6 \u2013 Apparent cumulative unidirectional backscattering mismatch distribution for six splice combinations of B1.3 and B6 reported in Table 1 <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 7.3 Fault locations Figure 7 \u2013 Schematic drawing of a fibre with twoconsecutive defects 1 and 2 <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Guidance for the interpretation of OTDR backscattering traces for single-mode fibres<\/b><\/p>\n |