1、 IEC 61300-3-53 Edition 1.0 2015-02 INTERNATIONAL STANDARD Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-53: Examinations and measurements Encircled angular flux (EAF) measurement method based on two-dimensional far field data from step index
2、 multimode waveguide (including fibre) IEC 61300-3-53:2015-02(en) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2015 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, elec
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11、, please contact the Customer Service Centre: csciec.ch. IEC 61300-3-53 Edition 1.0 2015-02 INTERNATIONAL STANDARD Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-53: Examinations and measurements Encircled angular flux (EAF) measurement method
12、 based on two-dimensional far field data from step index multimode waveguide (including fibre) INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 33.180.20 ISBN 978-2-83222-240-9 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication fr
13、om an authorized distributor. colour inside 2 IEC 61300-3-53:2015 IEC 2015 CONTENTS FOREWORD . 4 1 Scope 6 2 Normative references. 6 3 Terms and definitions 6 4 Standard atmospheric conditions . 7 5 Apparatus 7 5.1 General . 7 5.2 Measurement method 1: f lens imaging 8 5.2.1 General . 8 5.2.2 Micro-
14、positioner . 8 5.2.3 FFP optical system 8 5.2.4 Camera 8 5.2.5 Computer (EAF analyser module) . 9 5.2.6 Calibration light source 9 5.3 Measurement method 2: direct imaging 9 5.3.1 General . 9 5.3.2 Micro-positioner . 9 5.3.3 Optical power . 9 5.3.4 Alignment 9 5.3.5 Detector . 9 5.3.6 Single-mode fi
15、bre . 10 5.3.7 Imaging device . 10 6 Sampling and specimens . 11 7 Geometric calibration . 11 8 Measurement procedure 12 8.1 Safety . 12 8.2 Far field image acquisition . 12 8.2.1 General . 12 8.2.2 Waveguide end-face alignment . 12 8.2.3 Light source image acquisition . 12 8.3 Removal of background
16、 noise 13 8.4 Centre determination . 13 8.4.1 General . 13 8.4.2 Method A: Optical centre determination 13 8.4.3 Method B: Mechanical centre determination 14 8.5 Computation of encircled angular flux 14 9 Results 16 9.1 Information available with each measurement 16 9.2 Information available upon re
17、quest 16 10 Details to be specified . 16 Annex A (informative) System requirements: measurement method 1 Field optical system 18 A.1 General . 18 A.2 Requirements 18 Annex B (informative) System requirements: measurement method 2 Direct imaging . 19 B.1 General . 19 IEC 61300-3-53:2015 IEC 2015 3 B.
18、2 Requirements 19 Bibliography . 20 Figure 1 Apparatus configuration: Measurement method 1: f lens imaging . 8 Figure 2 Far field optical system diagram . 8 Figure 3 Apparatus configuration: measurement method 2 Direct imaging using an integrating sphere . 10 Figure 4 Apparatus configuration: measur
19、ement method 2 Direct imaging using a single-mode fibre 10 Figure 5 Apparatus configuration: measurement method 2 Direct imaging using an imaging device . 11 Figure 6 Calibration apparatus example 12 Figure 7 Acquired far field image 13 Figure 8 Acquired far field image with false colour 13 Figure 9
20、 Optical centre determination . 14 Figure 10 Coordinate conversion to polar coordinate on the image sensor plane . 15 Figure 11 Standard encircled angular flux chart 16 Figure A.1 An example of an optical system using an f lens . 18 4 IEC 61300-3-53:2015 IEC 2015 INTERNATIONAL ELECTROTECHNICAL COMMI
21、SSION _ FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS BASIC TEST AND MEASUREMENT PROCEDURES Part 3-53: Examinations and measurements Encircled angular flux (EAF) measurement method based on two-dimensional far field data from step index multimode waveguide (including fibre) FOREWORD 1)
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32、me of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61300-3-53 has been prepared by subcommittee 86B: Fibre optic interconnecting devices and passive components, of
33、 IEC technical committee 86: Fibre optics. IEC 61300-3-53:2015 IEC 2015 5 The text of this standard is based on the following documents: FDIS Report on voting 86B/3850/FDIS 86B/3875/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in
34、 the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts in the IEC 61300 series, published under the general title, Fibre optic interconnecting and passive components Basic test and measurement procedures, can be found on the IEC web
35、site. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a
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37、 therefore print this document using a colour printer. 6 IEC 61300-3-53:2015 IEC 2015 FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS BASIC TEST AND MEASUREMENT PROCEDURES Part 3-53: Examinations and measurements Encircled angular flux (EAF) measurement method based on two-dimensional far
38、 field data from step index multimode waveguide (including fibre) 1 Scope 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
39、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 waveguides core within a certain solid angle. The EAF is measured as a function of the numerical
40、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. 2 Normative references The following documents, in whole or in part, are normatively referenced in th
41、is document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60825-1, Safety of laser products Part 1: Equipment classification and requiremen
42、ts IEC 61300-1, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 1: General and guidance 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 encircled angular flux EAF fraction of the total opt
43、ical power radiating from a step index multimode waveguides core within a certain solid angle 3.2 f lens lens converting the angle of incidence of the input beam, , into the output beam height, h Note 1 to entry: The relationship between them is h = f, where f is the focal length of the lens. IEC 61
44、300-3-53:2015 IEC 2015 7 3.3 numerical aperture NA sine of the vertex half-angle of the largest cone of meridional rays that can enter or leave the core of an optical waveguide, multiplied by the refractive index of the medium in which the cone is located. 3.4 far field pattern FFP angular distribut
45、ion of light radiating from a waveguides core, which corresponds to the optical power distribution on a plane normal to the waveguide axis some distance from its end facet. Note 1 to entry: The distance depends on the largest waveguide cross section, a, the wavelength, lambda and the angle, , to the
46、 optical axis. It is abbreviated to FFP. In the far field region the shape of the distribution does not change as the distance from the waveguide end facet increases; the distribution only scales in size with distance, L. ( ) 2 2 cos 2a L 3.5 far field image far field pattern formed on an imaging de
47、vice 3.6 centroid optical centre of the far field image 3.7 neutral density filter ND filter that attenuates light of all colours equally 4 Standard atmospheric conditions The standard atmospheric conditions are specified in IEC 61300-1. 5 Apparatus 5.1 General The optical source multimode waveguide
48、 shall be long enough to ensure that all cladding modes are stripped by passage through the waveguide. Often the fibre coating or tight buffer is sufficient to perform this function. Alternatively a cladding mode stripper shall be used in the source launch optical multimode fibre. An example of a ty
49、pical cladding mode stripper which would be suitable for optical fibre is sufficient windings of the fibre around a mandrel of an appropriate diameter. The windings also have a more important essential effect to fully fill the transverse modes across the maximum mode field diameter. It should be checked that all of the transverse modes of the fibre are sufficiently well excited. This can be done by comparing the FFPs for different lengths
