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BS EN 61746-2:2011:2014 Edition

BS EN 61746-2:2011:2014 Edition

$189.07

Calibration of optical time-domain reflectometers (OTDR) – OTDR for multimode fibres

Published By Publication Date Number of Pages
BSI 2014 48
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This part of IEC 61746 provides procedures for calibrating multimode optical time domain reflectometers (OTDR). It covers OTDR measurement errors and uncertainties. The test of the laser(s) source modal condition is included as an optional measurement.

This standard does not cover correction of the OTDR response.

PDF Catalog

PDF Pages PDF Title
6 CONTENTS
8 INTRODUCTION
9 1 Scope
2 Normative references
3 Terms, definitions and symbols
10 Figures
Figure 1 – Definition of attenuation dead zone
15 4 Preparation for calibration
4.1 Organization
4.2 Traceability
4.3 Preparation
4.4 Test conditions
4.5 Documentation
16 5 Distance calibration – General
5.1 General
5.2 Location deviation model
17 Figure 2 – Representation of the location deviation ΔL(L)
18 5.3 Using the calibration results
Table 1 – Additional distance uncertainty
19 5.4 Measuring fibre length
6 Distance calibration methods
6.1 General
6.2 External source method
20 Figure 3 – Equipment for calibration of the distance scale – External source method
21 Figure 4 – Set-up for calibrating the system insertion delay
25 6.3 Concatenated fibre method (using multimode fibres)
Figure 5 – Concatenated fibres used for calibration of the distance scale
28 6.4 Recirculating delay line method
29 Figure 6 – Distance calibration with a recirculating delay line
30 Figure 7 – OTDR trace produced by recirculating delay line
32 7 Vertical scale calibration – General
7.1 General
33 7.2 Loss difference calibration
Figure 8 – Determining the reference level and the displayed power level
34 Figure 9 – Region A, the recommended region for loss measurement samples
Table 2 – Attenuation coefficients defining region A
35 7.3 Characterization of the OTDR source near field
Figure 10 – Possible placement of sample points within region A
36 8 Loss difference calibration method
8.1 General
8.2 Long fibre method
37 Figure 11 – Linearity measurement with a long fibre
Figure 12 – Placing the beginning of section D1 outside the attenuation dead zone
39 Annex A (normative) Multimode recirculating delay line for distance calibration
Figure A.1 – Recirculating delay line
40 Figure A.2 – Measurement set-up for loop transit time Tb
41 Figure A.3 – Calibration set-up for lead-in transit time Ta
43 Annex B (normative) Mathematical basis
46 Bibliography

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BS EN 61746-2:2011
$189.07