BS EN 61300-3-53:2015
$142.49
Fibre optic interconnecting devices and passive components. Basic test and measurement procedures – Examinations and measurements. Encircled angular flux (EAF) measurement method based on two-dimensional far field data from step index multimode waveguide (including fibre)
| Published By | Publication Date | Number of Pages |
| BSI | 2015 | 24 |
This part of IEC 61300 is intended to characterize the encircled angular flux of measurement step index multimode waveguide light sources, in which most of the transverse modes are excited. The term waveguide is understood to include both channel waveguides and optical fibres but not slab waveguides in this standard.
Encircled angular flux (EAF) is the fraction of the total optical power radiating from a step index multimode waveguide’s core within a certain solid angle. The EAF is measured as a function of the numerical aperture full angle. The basic approach is to collect, for every measurement, two dimensional far field data using a calibrated camera and to convert them mathematically into encircled angular flux.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 6 | CONTENTS |
| 8 | 1 Scope 2 Normative references 3 Terms and definitions |
| 9 | 4 Standard atmospheric conditions 5 Apparatus 5.1 General |
| 10 | 5.2 Measurement method 1: fθ lens imagin g 5.2.1 General 5.2.2 Micro-positioner 5.2.3 FFP optical system 5.2.4 Camera Figures Figure 1 – Apparatus configuration: Measurement method 1: fθ lens imaging Figure 2 – Far field optical system diagram |
| 11 | 5.2.5 Computer (EAF analyser module) 5.2.6 Calibration light source 5.3 Measurement method 2: direct imaging 5.3.1 General 5.3.2 Micro-positioner 5.3.3 Optical power 5.3.4 Alignment 5.3.5 Detector |
| 12 | 5.3.6 Single-mode fibre 5.3.7 Imaging device Figure 3 – Apparatus configuration: measurement method 2 –Direct imaging using an integrating sphere Figure 4 – Apparatus configuration: measurement method 2 –Direct imaging using a single-mode fibre |
| 13 | 6 Sampling and specimens 7 Geometric calibration Figure 5 – Apparatus configuration: measurement method 2 –Direct imaging using an imaging device |
| 14 | 8 Measurement procedure 8.1 Safety 8.2 Far field image acquisition 8.2.1 General 8.2.2 Waveguide end-face alignment 8.2.3 Light source image acquisition Figure 6 – Calibration apparatus example |
| 15 | 8.3 Removal of background noise 8.4 Centre determination 8.4.1 General 8.4.2 Method A: Optical centre determination Figure 7 – Acquired far field image Figure 8 – Acquired far field image with false colour |
| 16 | 8.4.3 Method B: Mechanical centre determination 8.5 Computation of encircled angular flux Figure 9 – Optical centre determination |
| 17 | Figure 10 – Coordinate conversion to polar coordinate on the image sensor plane |
| 18 | 9 Results 9.1 Information available with each measurement 9.2 Information available upon request 10 Details to be specified Figure 11 – Standard encircled angular flux chart |
| 20 | Annex A (informative) System requirements: measurement method 1 – Field optical system A.1 General A.2 Requirements Figure A.1 – An example of an optical system using an fθ lens |
| 21 | Annex B (informative) System requirements: measurement method 2 – Direct imaging B.1 General B.2 Requirements |
| 22 | Bibliography |
