1、 IEC 61280-1-4Edition 2.0 2009-11INTERNATIONAL STANDARD NORME INTERNATIONALEFibre optic communication subsystem test procedures Part 1-4: General communication subsystems Light source encircled flux measurement method Procdures dessai des sous-systmes de tlcommunication fibres optiques Partie 1-4: S
2、ous-systmes gnraux de tlcommunication Mthode de mesure du flux inscrit de la source lumineuse IEC61280-1-4:2009 colourinsideTHIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2009 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced o
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17、nication subsystem test procedures Part 1-4: General communication subsystems Light source encircled flux measurement method Procdures dessai des sous-systmes de tlcommunication fibres optiques Partie 1-4: Sous-systmes gnraux de tlcommunication Mthode de mesure du flux inscrit de la source lumineuse
18、 INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE WICS 33.180.01 PRICE CODECODE PRIXISBN 2-8318-1070-6 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale colourinside 2 61280-1-4 IEC:
19、2009 CONTENTS FOREWORD.4 0 Introduction 6 0.1 General .6 0.2 Changes from previous edition 6 0.3 Assumptions applicable to the characterization of data sources 6 0.4 Assumptions applicable to the characterization of measurement sources 6 1 Scope.7 2 Normative references .7 3 Terms and definitions .7
20、 4 Symbols .8 5 Apparatus.9 5.1 Common apparatus .9 5.1.1 General .9 5.1.2 Computer 10 5.1.3 Image digitizer.10 5.1.4 Detector 10 5.1.5 Magnifying optics.11 5.1.6 Attenuation11 5.1.7 Micropositioner (optional) 11 5.1.8 Input port.12 5.1.9 Calibration light source12 5.2 Transmission source apparatus.
21、12 5.2.1 General .12 5.2.2 Test jumper assembly13 5.2.3 Fibre shaker 13 5.3 Measurement source apparatus 14 6 Sampling and specimens14 7 Geometric calibration .15 8 Measurement procedure.15 8.1 Safety .15 8.2 Image acquisition 15 8.2.1 Raw image acquisition.15 8.2.2 Dark image acquisition 16 8.2.3 C
22、orrected image16 8.3 Optical centre determination16 8.3.1 General .16 8.3.2 Centroid image 16 8.3.3 Centroid computation 17 8.4 Test source image acquisition .17 9 Computation of encircled flux .17 9.1 Computation of radial data functions .17 9.2 Integration limit and baseline determination.19 9.2.1
23、 Integration limit19 9.2.2 Baseline determination 19 9.2.3 Baseline subtraction 19 61280-1-4 IEC:2009 3 9.3 Computation of encircled flux 19 10 Results.20 10.1 Information available with each measurement .20 10.2 Information available upon request20 11 Specification information 20 Annex A (informati
24、ve) Measurement sensitivity considerations 22 Annex B (informative) Theory of geometric calibration using the micropositioner .27 Annex C (normative) Procedure for geometric calibration using the micropositioner.32 Bibliography34 Figure 1 Apparatus block diagram10 Figure 2 Typical set-up for transmi
25、ssion source measurement .13 Figure 3 Fibre shaker example.14 Figure 4 Pixel and ring illustration18 Figure A.1 Core images from instrument A and instrument B .22 Figure A.2 Compressed core images from instrument A and instrument B22 Figure A.3 Intensity versus radius for Instruments A and B 23 4 61
26、280-1-4 IEC:2009 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ FIBRE OPTIC COMMUNICATION SUBSYSTEM TEST PROCEDURES Part 1-4: General communication subsystems Light source encircled flux measurement method FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for s
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36、 is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC sh
37、all not be held responsible for identifying any or all such patent rights. International Standard IEC 61280-1-4 has been prepared by subcommittee 86C: Fibre optic systems and active devices, of IEC technical committee 86: Fibre optics. This second edition cancels and replaces the first edition publi
38、shed in 2003. This second edition constitutes a technical revision. The significant technical changes with respect to the previous edition are described in the introduction. The text of this standard is based on the following documents: FDIS Report on voting 86C/920/FDIS 86C/932/RVD Full information
39、 on the voting for the approval of this standard can be found in the report on voting indicated in the above table. 61280-1-4 IEC:2009 5 This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of the IEC 61280 series can be found, under the general ti
40、tle Fibre optic communication subsystem test procedures, on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publica
41、tion. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. IMPORTANT The “colour inside” logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents.
42、Users should therefore print this publication using a colour printer. 6 61280-1-4 IEC:2009 0 Introduction 0.1 General This part of IEC 61280 is used to measure the encircled flux of a multimode light source. Encircled flux is a measure, as a function of radius, of the fraction of the total power rad
43、iating from a multimode optical fibres core. The basic approach is to collect 2D nearfield data using a calibrated camera, and to mathematically convert the 2D data into three normalized functions of radial distance from the fibres optical centre. The three functions are intensity, incremental flux
44、and encircled flux. Intensity has dimension optical power per area; incremental flux has dimension power per differential of radius; and encircled flux has dimension total optical power, all three being functions of radius. These three radial functions are intended to characterize fibre optic laser
45、sources either for use in mathematical models predicting the minimum guaranteed length of a communications link, or to qualify a light source to measure insertion loss in multimode links. 0.2 Changes from previous edition This edition of the standard differs from its predecessor in both scope and co
46、ntent. Many of the content changes improve the measurement precision. Several changes have been made to the computation procedure: the integration methodology of the radial functions was simple summation, and is now specified to use trapezoidal integration or other higher-order techniques (see 9.3);
47、 a baseline subtraction step is specified to improve immunity to DC drifts (see 9.2.2 and 9.2.3); the ring width parameter is explicitly specified (see 9.2.1); the integration limit is specified (see 9.3). The geometric calibration of the apparatus microscope now specifies either (depending on the a
48、pplication) the methodology of IEC 61745 or the original technique using the micropositioning stage (see Clause 7). Pixel sensitivity uniformity correction is now optional. 0.3 Assumptions applicable to the characterization of data sources The 50-m or 62,5-m core near-parabolic graded-index multimod
49、e fibre used as the “test jumper assembly” is treated as if it possessed perfect circular symmetry about its optical centre, as asymmetries in the launched optical flux distributions will dominate any lopsidedness of the test jumper assembly. It is further assumed that all cladding modes will be stripped by passage through the specified ten metres or more of fibre. The modes o
