EN 60793-1-43-2015 en Optical fibres - Part 1-43 Measurement methods and test procedures - Numerical aperture measurement.pdf

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1、BSI Standards PublicationOptical fibresPart 1-43: Measurement methods and test procedures Numerical aperture measurementBS EN 60793-1-43:2015National forewordThis British Standard is the UK implementation of EN 60793-1-43:2015. It isidentical to IEC 60793-1-43:2015. It supersedes BS EN 60793-1-43:20

2、02which is withdrawn.The UK participation in its preparation was entrusted by TechnicalCommittee GEL/86, Fibre optics, to Subcommittee GEL/86/1, Optical fibresand cables.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport

3、 to include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 83410 3ICS 33.180.10Compliance with a British Standard cannot confer immunity fromlegal obligations.T

4、his British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 May 2015.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 60793-1-43:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60793-1-43 May 2015 ICS 33.180

5、.10 Supersedes EN 60793-1-43:2002 English Version Optical fibres - Part 1-43: Measurement methods and test procedures - Numerical aperture measurement (IEC 60793-1-43:2015) Fibres optiques - Partie 1-43 : Mthodes de mesure et procdures dessai - Mesure de louverture numrique (IEC 60793-1-43:2015) Lic

6、htwellenleiter - Teil 1-43: Messmethoden und Prfverfahren - Numerische Apertur (IEC 60793-1-43:2015) This European Standard was approved by CENELEC on 2015-05-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Sta

7、ndard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (E

8、nglish, 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 CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees

9、 of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Sloven

10、ia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CENELEC All ri

11、ghts of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 60793-1-43:2015 E BS EN 60793-1-43:2015EN 60793-1-43:2015 - 2 - Foreword The text of document 86A/1566/CDV, future edition 2 of IEC 60793-1-43, prepared by SC 86A “Fibres and cables“ of IEC/TC 86 “F

12、ibre optics“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60793-1-43:2015. The following dates 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) 2016-02-01 late

13、st date by which the national standards conflicting with the document have to be withdrawn (dow) 2018-05-01 This document supersedes EN 60793-1-43:2002. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not

14、be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 60793-1-43:2015 was approved by CENELEC as a European Standard without any modification. BS EN 60793-1-43:2015- 3 - EN 60793-1-43:2015 Annex ZA (normative) Normative refer

15、ences 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 application. For dated references, only the edition cited applies. For undated references, the la

16、test 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 2 Up-to-date information on the latest versions of the European Standards listed in thi

17、s annex is available here: www.cenelec.eu Publication Year Title EN/HD Year IEC 60793-1-1 - Optical fibres - Part 1-1: Measurement methods and test procedures - General and guidance EN 60793-1-1 - IEC 60793-1-21 - Optical fibres - Part 1-21: Measurement methods and test procedures - Coating geometry

18、 EN 60793-1-21 - IEC 60793-1-22 - Optical fibres - Part 1-22: Measurement methods and test procedures - Length measurement EN 60793-1-22 - IEC 60793-2-10 - Optical fibres - Part 2-10: Product specifications - Sectional specification for category A1 multimode fibres EN 60793-2-10 - IEC 60793-2-20 - O

19、ptical fibres - Part 2-20: Product specifications - Sectional specification for category A2 multimode fibres EN 60793-2-20 - IEC 60793-2-30 - Optical fibres - Part 2-30: Product specifications - Sectional specification for category A3 multimode fibres EN 60793-2-30 - IEC 60793-2-40 - Optical fibres

20、- Part 2-40: Product specifications - Sectional specification for category A4 multimode fibres EN 60793-2-40 - BS EN 60793-1-43:2015 2 IEC 60793-1-43:2015 IEC 2015 CONTENTS FOREWORD . 4 1 Scope 6 2 Normative references. 6 3 Overview of method . 6 4 Reference test method . 7 5 Apparatus 8 5.1 Input s

21、ystem . 8 5.1.1 Light source . 8 5.1.2 Input optics 8 5.1.3 Fibre input end support and alignment 8 5.1.4 Cladding mode stripper 8 5.2 Output system and detection . 8 5.2.1 General . 8 5.2.2 Technique 1 Angular scan (see Figure 2) . 9 5.2.3 Technique 2 Angular scan (see Figure 3) . 10 5.2.4 Techniqu

22、e 3 Scan of the spatial field pattern (see Figure 4) . 10 5.2.5 Technique 4 Inverse far-field measurement (see Figure 5, applicable to subcategory A4d fibres) 12 6 Sampling and specimens . 13 6.1 Specimen length . 13 6.2 Specimen endface . 13 7 Procedure . 13 8 Calculations 13 8.1 Far-field versus m

23、aximum theoretical value . 13 8.2 Threshold intensity angle, k. 14 8.3 Numerical aperture, NAff. 14 8.4 Calculating far-field intensity pattern when using Technique 3 15 8.5 Calculating NA when using Technique 4 15 9 Results 15 9.1 Information available with each measurement 15 9.2 Information avail

24、able upon request 16 10 Specification information 16 Annex A (informative) Mapping NA measurement to alternative lengths 17 A.1 Introductory remark . 17 A.2 Mapping long length NAffmeasurement to short length NAffmeasurement . 17 Annex B (normative) Product specific default values for NA measurement

25、 . 18 B.1 Introductory remark . 18 B.2 Table of default values used in NA measurement for multimode products . 18 Figure 1 Representative refractive index profile for a graded index multimode fibre 7 Figure 2 Technique 1 Angular scan . 9 Figure 3 Technique 2 Angular scan 10 Figure 4 Technique 3 Scan

26、 of the spatial field pattern 11 BS EN 60793-1-43:2015IEC 60793-1-43:2015 IEC 2015 3 Figure 5 Technique 4 Inverse far-field method . 13 Figure 6 Example of a far-field NA measurement 14 Figure 7 Sample output of an A4d fibre measured using Technique 4 15 Table B.1 Default values for parameters used

27、in the far-field NA measurement of multimode fibres . 18 BS EN 60793-1-43:2015 4 IEC 60793-1-43:2015 IEC 2015 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ OPTICAL FIBRES Part 143: Measurement methods and test procedures Numerical aperture measurement FOREWORD 1) The International Electrotechnical Com

28、mission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and

29、 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee

30、 interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accorda

31、nce with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all inter

32、ested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsi

33、ble for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence b

34、etween any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of

35、 conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

36、 members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publicat

37、ion or any other IEC Publications. 8) Attention 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 Publicat

38、ion may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60793-1-43 has been prepared by subcommittee 86A: Fibres and cables, of IEC technical committee 86: Fibre optics. This second edition cancels and repla

39、ces the first edition published in 2001, and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: expansion of the scope to include A1, A2, A3 and A4 multimode fibre categories; addition of measurement parameters of

40、 sample length and threshold values, product specific to the variables that are now found in the product specifications; a new Annex B entitled “Product specific default values for NA measurement“; addition of a new Technique 4 for measuring NA of A4d fibres; BS EN 60793-1-43:2015IEC 60793-1-43:2015

41、 IEC 2015 5 a new Annex A entitled “Mapping NA measurement to alternative lengths“ that gives a mapping function to correlate shorter sample length measurements to the length suggested in the reference test method Naff. This International Standard is to be used in conjunction with IEC 60793-1-1, IEC

42、 60793-1-21 and IEC 60793-1-22. The text of this standard is based on the following documents: CDV Report on voting 86A/1566/CDV 86A/1622/RVC Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been

43、drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts in the IEC 60793 series, published under the general title Optical fibres, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the stability date in

44、dicated 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 revised edition, or amended. A bilingual version of this publication may be issued at a later date. IMPORTANT The colo

45、ur 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. Users should therefore print this document using a colour printer. BS EN 60793-1-43:2015 6 IEC 60793-1-43:2015 IEC 2015 OPTICAL FIB

46、RES Part 143: Measurement methods and test procedures Numerical aperture measurement 1 Scope This part of IEC 60793 establishes uniform requirements for measuring the numerical aperture of optical fibre, thereby assisting in the inspection of fibres and cables for commercial purposes. The numerical

47、aperture (NA) of categories A1, A2, A3 and A4 multimode fibre is an important parameter that describes a fibres light-gathering ability. It is used to predict launching efficiency, joint loss at splices, and micro/macrobending performance. The numerical aperture is defined by measuring the far-field

48、 pattern (NAff). In some cases the theoretical numerical aperture (NAth) is used in the literature, which can be determined from measuring the difference in refractive indexes between the core and cladding. Ideally these two methods should produce the same value. 2 Normative references The following

49、 documents, in whole or in part, are normatively referenced 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 60793-1-1, Optical fibres Part 1-1: Measurement methods and test procedures General and guidance IEC 60793-1-21, Optical fibres Part 1-21: Measurement method