BS EN 61300-3-53-2015 Fibre optic interconnecting devices and passive components Basic test and measurement procedures Examinations and measurements Encircled angular flux (EAF) mee.pdf

1、BSI Standards PublicationFibre optic interconnecting devices and passive components Basic test and measurement proceduresPart 3-53: Examinations and Measurements Encircled angular flux (EAF) measure-ment method based on two-dimensional far field data from step index multimode waveguide (including fi

2、bre)BS EN 61300-3-53:2015National forewordThis British Standard is the UK implementation of EN 61300-3-53:2015. It isidentical to IEC 61300-3-53:2015.The UK participation in its preparation was entrusted by TechnicalCommittee GEL/86, Fibre optics, to Subcommittee GEL/86/2, Fibre opticinterconnecting

3、 devices and passive components.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institutio

4、n 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 82206 3ICS 33.180.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 March 2015.Amendments/corrigend

5、a issued since publicationDate Text affectedBRITISH STANDARDBS EN 61300-3-53:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61300-3-53 March 2015 ICS 33.180.20 English Version Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-53: Ex

6、aminations and measurements - Encircled angular flux (EAF) measurement method based on two-dimensional far field data from step index multimode waveguide (including fibre) (IEC 61300-3-53:2015) Dispositifs dinterconnexion et composants passifs fibres optiques - Procdures fondamentales dessais et de

7、mesures - Partie 3-53 : Examens et mesures - Mthode de mesure du flux angulaire inscrit (EAF) fonde sur les donnes bidimensionnelles de champ lointain dun guide donde multimodal saut dindice (fibre incluse) (IEC 61300-3-53:2015) Lichtwellenleiter - Verbindungselemente und passive Bauteile -Grundlege

8、nde Prf- und Messverfahren - Teil 3-53: Untersuchungen und Messungen - Verfahren zur Messung des winkelabhngigen begrenzten Lichtstroms (EAF) basierend auf den zweidimensionalen Fernfelddaten einer Mehrmodenfaser (IEC 61300-3-53:2015) This European Standard was approved by CENELEC on 2015-03-12. CEN

9、ELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on

10、application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CE

11、N-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungar

12、y, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique

13、 Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 61300-3-53:2015 E BS EN 61300-3-53:2015EN 61300-3-53:2015 - 2 -

14、Foreword The text of document 86B/3850/FDIS, future edition 1 of IEC 61300-3-53, prepared by SC 86B “Fibre optic interconnecting devices and passive components“ of IEC/TC 86 “Fibre optics“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 61300-3-53:2015. The following dat

15、es are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2015-12-12 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2018-03-12 Attention is dra

16、wn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 61300-3-53:2015 was approved by CENELEC

17、as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60793-2-30 NOTE Harmonized as EN 60793-2-30. IEC 60793-2-40 NOTE Harmonized as EN 60793-2-40. IEC 60793-1-43 NOTE Harmonized as EN 60793-1

18、-43. BS EN 61300-3-53:2015- 3 - EN 61300-3-53:2015 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its applicatio

19、n. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. NOTE

20、2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here: www.cenelec.eu. Publication Year Title EN/HD Year IEC 60825-1 - Safety of laser products - Part 1: Equipment classification and requirements EN 60825-1 - IEC 61300-1 - Fibre optic interc

21、onnecting devices and passive components - Basic test and measurement procedures - Part 1: General and guidance EN 61300-1 - BS EN 61300-3-53:2015 2 IEC 61300-3-53:2015 IEC 2015 CONTENTS 1 Scope 6 2 Normative references. 6 3 Terms and definitions 6 4 Standard atmospheric conditions . 7 5 Apparatus 7

22、 5.1 General . 7 5.2 Measurement method 1: f lens imaging 8 5.2.1 General . 8 5.2.2 Micro-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-positi

23、oner . 9 5.3.3 Optical power . 9 5.3.4 Alignment 9 5.3.5 Detector . 9 5.3.6 Single-mode fibre . 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 e

24、nd-face alignment . 12 8.2.3 Light source image acquisition . 12 8.3 Removal of background 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 Resul

25、ts 16 9.1 Information available with each measurement 16 9.2 Information available upon request 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: m

26、easurement method 2 Direct imaging . 19 B.1 General . 19 BS EN 61300-3-53:2015IEC 61300-3-53:2015 IEC 2015 3 B.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

27、: measurement method 2 Direct imaging using an integrating sphere . 10 Figure 4 Apparatus configuration: measurement 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

28、example 12 Figure 7 Acquired far field image 13 Figure 8 Acquired far field image with false colour 13 Figure 9 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 exampl

29、e of an optical system using an f lens . 18 BS EN 61300-3-53:2015 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-dime

30、nsional far 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 und

31、erstood 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 waveguides core within a certain solid angle. The EAF is measured as a function of the

32、 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. 2 Normative references The following documents, in whole or in part, are normatively refer

33、enced in this 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

34、 requirements 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 th

35、e total optical 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 l

36、ens. BS EN 61300-3-53:2015IEC 61300-3-53:2015 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 fie

37、ld pattern FFP angular distribution 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

38、, lambda and the angle, to the 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. ( )22cos2aL 3.5 far field image far field patter

39、n formed on an imaging device 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 s

40、ource multimode waveguide 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

41、fibre. An example of a typical 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 d

42、iameter. 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 of the launch fibre or different light sources. Once the FFP no longer changes in form as the launch fibre length is increased there

43、 is no need to increase the length further. BS EN 61300-3-53:2015 8 IEC 61300-3-53:2015 IEC 2015 5.2 Measurement method 1: f lens imaging 5.2.1 General In theory, this measurement method, which is effectively a coherent optical method to Fourier Transform the near field to the far field using a lens

44、, does not operate well using very wideband optical sources. Experimentally it has been shown to operate sufficiently well for sources up to 30 nm bandwidth which are most commonly used. Figure 1 below shows the apparatus configuration. The measurement system consists of a micro-positioner, a far fi

45、eld broadband optical system, a camera and computer (beam analysis module). An appropriate type of camera (detector) should be chosen to suit the wavelength. Figure 1 Apparatus configuration: Measurement method 1: f lens imaging 5.2.2 Micro-positioner The micro-positioner shall have a function of fi

46、xing an optical waveguide and moving in three directions (X, Y, Z). In addition yaw and pitch controls are recommended. 5.2.3 FFP optical system As shown in Figure 2, basically, an f lens can directly convert input the light from the multimode waveguide to a far field image, however, scaling the far

47、 field image in order to fit the image sensor in the camera and adjustment of the light intensity in order to prevent saturation may be required. The FFP optical system shall be chosen to operate at the measurement wavelength across the required measurement bandwidth to match that of the detection s

48、ystem. See Annex A for more information. Figure 2 Far field optical system diagram 5.2.4 Camera Although, the detector is typically a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) camera, other types of array cameras may be considered. The type of image sensor shall

49、 be chosen by the measurement wavelength. Absolute radiometric measurement of flux (optical power flow) is not required. Computer (EAF analyser module) FFP optical system Camera (image sensor) Micro-positioner Optical fibre IEC IEC f objective lens Field lens Imaging relay lens BS EN 61300-3-53:2015IEC 61300-3-53:2015 IEC 2015 9 5.2.5 Computer (EAF analyser module) Since the acquired image contains many thousands of pixels, and the image conver