IEC 62221, which is a technical report , describes four methods (A, B, C and D) for the measurement of microbending sensitivity of optical fibres.<\/p>\n
These four methods are distinguished by the equipment being used for measurements and their applications:<\/p>\n
method A using an expandable drum and applies to category A1 and class B fibres;<\/p>\n<\/li>\n
method B using a fixed diameter drum and applies to category A1 and class B fibres;<\/p>\n<\/li>\n
method C using a plate and applied loads and applies to category A1 and class B fibres;<\/p>\n<\/li>\n
method D using a “basketweave” wrap on a fixed diameter drum, and applies to category A1 and class B fibres<\/p>\n<\/li>\n<\/ul>\n
Methods A and B may also be used to measure the microbending sensitivity of optical fibre ribbons.<\/p>\n
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.<\/p>\n
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.<\/p>\n
The results from the four methods can only be compared qualitatively . These methods are considered characterization type tests.<\/p>\n
It shall be understood that the microbend results from any method, could have significant variation between laboratories .<\/p>\n
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.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\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 <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 3 General properties of microbending loss 4 General considerations 4.1 Launch condition for multimode fibres 4.2 Sample lengths 4.3 Winding tension <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 5.1.3 Procedure 5.1.4 Calculations Figures Figure 1 \u2013Set-up for expandable drum method used in an optical fibre testing facility <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 5.2 Method B: fixed diameter drum 5.2.1 General 5.2.2 Apparatus <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | Figure 2 \u2013 Standard winding\/prooftester can be used for preparing the sample Figure 3 \u2013 Example of a possible set-up in temperature cycling <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 5.2.3 Procedure 5.2.4 Calculations Figure 4 \u2013 Alternative wire mesh set-up used in an optical fibre testing facility <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 5.3 Method C: plate test 5.3.1 General 5.3.2 Apparatus Figure 5 \u2013 Microbend-inducing equipment <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 5.3.3 Procedure 5.3.4 Calculations <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5.4 Method D: basketweave 5.4.1 General 5.4.2 Apparatus Figure 6 \u2013 Quartz drum with basketwoven fibre <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 5.4.3 Procedure Figure 7 \u2013 Basketweave example as used in an optical fibre testing facility <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 5.4.4 Calculations or interpretation of results 6 Results Figure 8 \u2013 Example of temperature cycle inside chamber <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | Annex A (informative) Representative results with method B Table A.1 \u2013 Used instrument and values for single-mode fibres <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Figure A.1 \u2013 Example of temperature cycling of 10 different unshiftedsingle-mode fibres (wavelength 1 310 nm) Figure A.2 \u2013 Example of temperature cycling of 10 differentunshifted single-mode fibres (wavelength 1 550 nm) <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | Figure A.3 \u2013 Microbending repeatability for fibre N\u00b0 1 with winding tension 1 N Figure A.4 \u2013 Ribbon set-up <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | Figure A.5 \u2013 Losses at 1 310 nm for different ribbons Figure A.6 \u2013 Losses at 1 625 nm for different ribbons <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | Table A.2 \u2013 Multimode fibre test results <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Optical fibres. Measurement methods. Microbending sensitivity<\/b><\/p>\n |