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BSI PD IEC/TR 62221:2012

BSI PD IEC/TR 62221:2012

$142.49

Optical fibres. Measurement methods. Microbending sensitivity

Published By Publication Date Number of Pages
BSI 2012 28
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IEC 62221, which is a technical report , describes four methods (A, B, C and D) for the measurement of microbending sensitivity of optical fibres.

These four methods are distinguished by the equipment being used for measurements and their applications:

  • method A using an expandable drum and applies to category A1 and class B fibres;

  • method B using a fixed diameter drum and applies to category A1 and class B fibres;

  • method C using a plate and applied loads and applies to category A1 and class B fibres;

  • method D using a “basketweave” wrap on a fixed diameter drum, and applies to category A1 and class B fibres

Methods A and B may also be used to measure the microbending sensitivity of optical fibre ribbons.

Methods A and C offer the capability to measure the microbending sensitivity over a wide range of applied linear pressure or loads. Method B may be used to determine the microbending sensitivity for a fixed linear pressure.

Methods A, B and D can also be used at different temperatures (temperature cycling) provided special low thermal expansion materials (e.g. quartz drums) are used.

The results from the four methods can only be compared qualitatively . These methods are considered characterization type tests.

It shall be understood that the microbend results from any method, could have significant variation between laboratories .

These methods do not constitute a routine test used in the general evaluation of optical fibre. This parameter is not generally specified within a detail specification.

PDF Catalog

PDF Pages PDF Title
4 CONTENTS
6 FOREWORD
8 1 Scope
2 Normative references
9 3 General properties of microbending loss
4 General considerations
4.1 Launch condition for multimode fibres
4.2 Sample lengths
4.3 Winding tension
10 4.4 Relaxation time
4.5 Material used for fixed roughness
4.6 Drum materials
4.7 Drum material for temperature cycling
5 Test procedures
5.1 Method A: expandable drum
5.1.1 General
5.1.2 Apparatus
11 5.1.3 Procedure
5.1.4 Calculations
Figures
Figure 1 ā€“Set-up for expandable drum method used in an optical fibre testing facility
12 5.2 Method B: fixed diameter drum
5.2.1 General
5.2.2 Apparatus
13 Figure 2 ā€“ Standard winding/prooftester can be used for preparing the sample
Figure 3 ā€“ Example of a possible set-up in temperature cycling
14 5.2.3 Procedure
5.2.4 Calculations
Figure 4 ā€“ Alternative wire mesh set-up used in an optical fibre testing facility
15 5.3 Method C: plate test
5.3.1 General
5.3.2 Apparatus
Figure 5 ā€“ Microbend-inducing equipment
16 5.3.3 Procedure
5.3.4 Calculations
17 5.4 Method D: basketweave
5.4.1 General
5.4.2 Apparatus
Figure 6 ā€“ Quartz drum with basketwoven fibre
18 5.4.3 Procedure
Figure 7 ā€“ Basketweave example as used in an optical fibre testing facility
19 5.4.4 Calculations or interpretation of results
6 Results
Figure 8 ā€“ Example of temperature cycle inside chamber
21 Annex A (informative) Representative results with method B
Table A.1 ā€“ Used instrument and values for single-mode fibres
22 Figure A.1 ā€“ Example of temperature cycling of 10 different unshiftedsingle-mode fibres (wavelength 1 310 nm)
Figure A.2 ā€“ Example of temperature cycling of 10 differentunshifted single-mode fibres (wavelength 1 550 nm)
23 Figure A.3 ā€“ Microbending repeatability for fibre NĀ° 1 with winding tension 1 N
Figure A.4 ā€“ Ribbon set-up
24 Figure A.5 ā€“ Losses at 1 310 nm for different ribbons
Figure A.6 ā€“ Losses at 1 625 nm for different ribbons
25 Table A.2 ā€“ Multimode fibre test results
26 Bibliography

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BSI PD IEC/TR 62221:2012
$142.49