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BS EN IEC 61280-1-4:2023

BS EN IEC 61280-1-4:2023

$167.15

Fibre optic communication subsystem test procedures – General communication subsystems. Light source encircled flux measurement method

Published By Publication Date Number of Pages
BSI 2023 34
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IEC 61280-1-4:2023 is available as IEC 61280-1-4:2023 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 61280-1-4:2023 establishes the characterization process of the encircled flux measurement method of light sources intended to be used with multimode fibre. This document sets forth a procedure for the collection of two-dimensional fibre optic nearfield greyscale data and subsequent reduction to one-dimensional data expressed as a set of three sampled parametric functions of radius from the fibre’s optical centre. Estimation of the fibre core diameter is not an objective of this document. This third edition cancels and replaces the second edition published in 2009. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: – improvement of calibration procedure and calibration traceability; – improvement of fibre shaker description and requirements; – addition of pulsed light sources; – removal of a poorly traceable calibration process using a micro positioner.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
6 Blank Page
7 English
CONTENTS
9 FOREWORD
11 INTRODUCTION
12 1 Scope
2 Normative references
3 Terms and definitions
13 4 Symbols
15 5 Assumptions
5.1 Assumptions applicable to the characterization of data sources
5.2 Assumptions applicable to the characterization of measurement sources
6 Apparatus
6.1 Common apparatus
6.1.1 General
6.1.2 Computer
Figures
Figure 1 – Apparatus block diagram
16 6.1.3 Image digitizer
6.1.4 Detector
6.1.5 Magnifying optics
17 6.1.6 Attenuator
6.1.7 Micro positioner (optional)
6.1.8 Input port
6.1.9 Calibration light source
18 6.2 Transmission source apparatus
6.2.1 General
6.2.2 Test jumper assembly
6.2.3 Fibre shaker
Figure 2 – Typical set-up for transmission source measurement
19 Figure 3 – Fibre shaker example
20 6.3 Measurement source apparatus
7 Sampling and specimens
8 Geometric calibration
9 Measurement procedure
9.1 Safety
9.2 Image acquisition
9.2.1 Raw image acquisition
21 9.2.2 Dark image acquisition
9.2.3 Corrected image
9.3 Optical centre determination
9.3.1 General
22 9.3.2 Centroid image
9.3.3 Centroid computation
23 9.4 Test source image acquisition
10 Computation of encircled flux
10.1 Computation of radial data functions
Figure 4 – Pixel and ring illustration
25 10.2 Integration limit and baseline determination
10.2.1 Integration limit
10.2.2 Baseline determination
10.2.3 Baseline subtraction
26 10.3 Computation of encircled flux
11 Results
11.1 Information available with each measurement
11.2 Information available upon request
27 12 Specification information
28 Annex A (informative) Measurement sensitivity considerations
Figure A.1 – Core images from instrument A and instrument B
29 Figure A.2 – Compressed core images from instrument A and instrument B
Figure A.3 – Intensity versus radius for instruments A and B
33 Bibliography

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BS EN IEC 61280-1-4:2023
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