IEC TR 62547:2013
(Main)Guidelines for the measurement of high-power damage sensitivity of single-mode fibre to bends - Guidance for interpretation of results
Guidelines for the measurement of high-power damage sensitivity of single-mode fibre to bends - Guidance for interpretation of results
IEC/TR 62547:2013(E) describes two methods for the measurement of the sensitivity of single-mode optical fibres to high-power damage at bends:
- test method 1 - Failure time characterisation as a function of the launch power and bend conditions (bend angle and bend diameter);
- test method 2 - Equilibrium temperature measurement. Results from the two methods can only be compared qualitatively. This second edition cancels and replaces the first edition published in 2009, and constitutes a technical revision. The main changes with respect to the previous edition are:
- updates related to B6 (bend-insensitive) category single-mode fibres);
- update to analysis for test method 2: Maximum temperature specification. Key words: sensitivity of single-mode optical fibres to high-power damage at bends
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IEC/TR 62547 ®
Edition 2.0 2013-05
TECHNICAL
REPORT
colour
inside
Guidelines for the measurement of high-power damage sensitivity of single-
mode fibre to bends – Guidance for the interpretation of results
IEC/TR 62547:2013(E)
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IEC/TR 62547 ®
Edition 2.0 2013-05
TECHNICAL
REPORT
colour
inside
Guidelines for the measurement of high-power damage sensitivity of single-
mode fibre to bends – Guidance for the interpretation of results
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
W
ICS 33.180.10 ISBN 978-2-83220-801-4
– 2 – TR 62547 © IEC:2013(E)
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Background . 7
4 Test procedures . 9
4.1 Safety. 9
4.1.1 Safety issues . 9
4.1.2 Eye safe working . 9
4.1.3 Risk of fire/flame . 9
4.1.4 Risk of atmospheric pollution from coating by-products. 9
4.1.5 Risk of fibre fuse initiation . 9
4.1.6 Risk of damage to downstream components . 10
4.1.7 Risk avoidance . 10
4.2 General . 10
4.3 Apparatus . 10
4.3.1 Light source . 10
4.3.2 Isolator . 10
4.3.3 Bend jig . 11
4.3.4 Receiver . 11
4.3.5 Attenuator . 11
4.3.6 Computer . 11
4.3.7 Camera . 11
4.3.8 Thermal imaging camera . 11
4.3.9 Oven . 11
4.3.10 Sample . 12
4.4 Test method 1 – Failure time characterization as a function of the launch
power and bend conditions (bend angle and diameter) . 12
4.4.1 Description and procedure . 12
4.4.2 General comments and conclusions on test method 1 . 13
4.4.3 Reported items for test method 1 . 14
Test method 2 – Equilibrium temperature measurement . 14
4.5
4.5.1 General . 14
4.5.2 Coating heating measurements and power lost at bend . 16
4.5.3 Analysis – test method 2: equilibrium temperature . 17
4.5.4 Test conditions for test method 2 . 18
4.5.5 Conclusions on test method 2 . 19
4.5.6 Reported items for test method 2 . 19
5 Conclusions . 20
Annex A (informative) Robustness of fibres against damage from exposure to high
power at bends . 21
Bibliography . 39
Figure 1 – Example of experimental layout . 11
Figure 2 – Damage results for fibre ‘G’. 13
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) . 15
TR 62547 © IEC:2013(E) – 3 –
Figure 4 – Sample FLIR camera output of the fibre bent under high power . 16
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]) . 16
Figure 6a – Calculated from experimental test data at 1 360 nm . 18
Figure 6b – Extrapolated for 1 550 nm . 18
Figure 6c – Extrapolated for 1 625 nm . 18
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 . 18
Figure A.1 – Clamping arrangements for high-power damage testing in 180° bends . 23
Figure A.2 – Clamping arrangement for high-power damage testing in 90° bends . 23
Figure A.3 – Typical R1 failure characteristics with a loss of greater than 10 dB . 24
Figure A.4 – Typical R2 failure characteristics . 24
Figure A.5 – A schematic illustration of the three regimes . 24
Figure A.6 – Monitor signal changes – Typical for an R1 failure . 25
Figure A.7 – Monitor signal changes – Typical for an R2 failure . 25
Figure A.8 – Damage results for fibre sample ‘D’ . 26
Figure A.9 – High-power damage results at 90° and 180° for fibre ‘D’ . 26
Figure A.10 – Time to failure versus bend diameter at different launched powers . 27
Figure A.11 – Bend loss performance at 180° (and 90° for comparison) for fibre ‘D’ . 28
Figure A.12 – Power limitation for primary coated fibre . 28
Figure A.13 – Comparison of power limitation for primary and secondary coated fibre
‘D’ . 29
Figure A.14 – Maximum optical power ensuring a 25 year lifetime and 180° bend loss
versus bend diameter (from reference [10]). 30
Figure A.15 – Maximum optical power ensuring a 25 year lifetime versus 180° bend
loss . 30
Figure A.16 – 180° 2-point OSA bend loss for fibre ‘D’ . 32
Figure A.17 – 180° 2-point bend loss at 1 480 nm for fibre ‘D’ . 32
Figure A.18 – 2-point bend loss for fibre ‘D’ at various angles . 33
Figure A.19 – 180° 2-point bend loss at 1 480 nm for a range of fibres . 34
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 . 35
Figure A.21 – Effect of baking primary coated fibre ‘C’ (reference [15]) in an oven at
constant temperature . 35
Figure A.22 – Time to failure for different coatings as a function of bend radius . 37
Table A.1 – Dependence of high-power damage on power entering coating . 37
– 4 – TR 62547 © IEC:2013(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
GUIDELINES FOR THE MEASUREMENT OF HIGH-POWER
DAMAGE SENSITIVITY OF SINGLE-MODE FIBRE TO BENDS –
GUIDANCE FOR THE INTERPRETATION OF RESULTS
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