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BSI PD IEC/TR 62547:2013

BSI PD IEC/TR 62547:2013

$167.15

Guidelines for the measurement of high-power damage sensitivity ofsinglemode fibre to bends. Guidance for the interpretation of results

Published By Publication Date Number of Pages
BSI 2013 44
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This technical report describes two methods for the measurement of the sensitivity of single – mode optical fibres to high-power damage at bends:

  • te st method 1 – Failure time characterisation as a function of the launch power and bend conditions (bend angle and bend diameter);

  • t est method 2 – Equilibrium temperature measurement .

Results from the two methods can only be compared qualitatively.

The results in this report are predominantly on un -cabled and un-buffered fibres. Cabled and buffered fibres are expected to respond differently , because the outer layers can affect the ageing process. Note also that test method 2 testing cannot be applied to buffered or cabled fibres.

These methods do not constitute a routine test to be used in the evaluation of optical fibre.

The parameters derived from the two methods are not intended to be specified within a detailed fibre specification.

The catastrophic failure modes arising and which are described in this document in general occur at bending radii much smaller than specified in the single -mode fibre specification IEC 60793-2-50 or than would be recommended based on mechanical reliability considerations alone.

This report includes several annexes, including a discussion on the rationale for the approaches adopted, metrics for assessment, guidance, examples and some conclusions from initial studies.

PDF Catalog

PDF Pages PDF Title
4 CONTENTS
6 FOREWORD
8 1 Scope
2 Normative references
9 3 Background
11 4 Test procedures
4.1 Safety
4.1.1 Safety issues
4.1.2 Eye safe working
4.1.3 Risk of fire/flame
4.1.4 Risk of atmospheric pollution from coating by-products
4.1.5 Risk of fibre fuse initiation
12 4.1.6 Risk of damage to downstream components
4.1.7 Risk avoidance
4.2 General
4.3 Apparatus
4.3.1 Light source
4.3.2 Isolator
13 4.3.3 Bend jig
4.3.4 Receiver
4.3.5 Attenuator
4.3.6 Computer
4.3.7 Camera
4.3.8 Thermal imaging camera
4.3.9 Oven
Figures
Figure 1 – Example of experimental layout
14 4.3.10 Sample
4.4 Test method 1 – Failure time characterization as a function of the launch power and bend conditions (bend angle and diameter)
4.4.1 Description and procedure
15 4.4.2 General comments and conclusions on test method 1
Figure 2 – Damage results for fibre ‘G’
16 4.4.3 Reported items for test method 1
4.5 Test method 2 – Equilibrium temperature measurement
4.5.1 General
17 Figure 3 –Example of time evolution of catastrophic high-power loss and related maximum temperature reached by the coating near to the top of the bent fibre (apex)
18 4.5.2 Coating heating measurements and power lost at bend
Figure 4 – Sample FLIR camera output of the fibre bent under high power
Figure 5 – Dependence of the coating equilibrium temperature as a function of launched power and bend diameter for an IEC B1.2/ITU-T G.654 single-mode fibre (see reference [10])
19 4.5.3 Analysis – test method 2: equilibrium temperature
20 4.5.4 Test conditions for test method 2
Figure 6a – Calculated from experimental test data at 1 360 nm
Figure 6b – Extrapolated for 1 550 nm
Figure 6c – Extrapolated for 1 625 nm
Figure 6 – Maximum safe powers for 25 year life time as a function of bend radius enabling a safe coating temperature of ~80 °C for four single-mode fibre (sub-) categories
21 4.5.5 Conclusions on test method 2
4.5.6 Reported items for test method 2
22 5 Conclusions
23 Annex A (informative) Robustness of fibres against damage fromexposure to high power at bends
25 Figure A.1 – Clamping arrangements for high-power damage testing in 180° bends
Figure A.2 – Clamping arrangement for high-power damage testing in 90° bends
26 Figure A.3 – Typical R1 failure characteristics with a loss of greater than 10 dB
Figure A.4 – Typical R2 failure characteristics
Figure A.5 – A schematic illustration of the three regimes
27 Figure A.6 – Monitor signal changes – Typical for an R1 failure
Figure A.7 – Monitor signal changes – Typical for an R2 failure
28 Figure A.8 – Damage results for fibre sample ‘D’
Figure A.9 – High-power damage results at 90° and 180° for fibre ‘D’
29 Figure A.10 – Time to failure versus bend diameter at different launched powers
30 Figure A.11 – Bend loss performance at 180° (and 90° for comparison) for fibre ‘D’
Figure A.12 – Power limitation for primary coated fibre
31 Figure A.13 – Comparison of power limitation for primary and secondary coated fibre ‘D’
32 Figure A.14 – Maximum optical power ensuring a 25 year lifetime and 180° bendloss versus bend diameter (from reference [10])
Figure A.15 – Maximum optical power ensuring a 25 year lifetime versus 180° bend loss
34 Figure A.16 – 180( 2-point OSA bend loss for fibre ‘D’
Figure A.17 – 180( 2-point bend loss at 1 480 nm for fibre ‘D’
35 Figure A.18 – 2-point bend loss for fibre ‘D’ at various angles
36 Figure A.19 – 180( 2-point bend loss at 1 480 nm for a range of fibres
37 Figure A.20 – Time to failure versus inverse of equilibrium temperature using an IEC B1.2/ITU-T G.654 single-mode fibre for bend diameters varying from 4 mm to 10 mm and launched power in the range 0,8 W to 3,2 W
Figure A.21 – Effect of baking primary coated fibre ‘C’ (reference [15]) in an oven at constant temperature
39 Figure A.22 – Time to failure for different coatings as a function of bend radius
Tables
Table A.1 – Dependence of high-power damage on power entering coating
41 Bibliography

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BSI PD IEC/TR 62547:2013
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