1、BSI Standards PublicationOptical fibresPart 1-20: Measurement methods and test procedures Fibre geometryBS EN 60793-1-20:2014Incorporating corrigendum March 2016National forewordThis British Standard is the UK implementation of EN 60793-1-20:2014. It isidentical to IEC 60793-1-20:2014, incorporating
2、 corrigendum March 2016.which is withdrawn.The UK participation in its preparation was entrusted by TechnicalCommittee GEL/86, Fibre optics, to Subcommittee GEL/86/1, Optical fibresand cables.A list of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 subcommittee can be obtainedThis publication does not purport to
3、 include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 93843 6ICS 33.180.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This
4、 British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 December 2014.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 60793-1-20:201430 April 2016 Implementation of IEC corrigendum March 2016:Clause B.3 updatedIt s
5、upersedes BS EN 60793-1-20:2002on request to its secretary.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60793-1-20 ICS 33.180.10 Incorporating corrigendum March 2016English Version Optical fibres - Part 1-20: Measurement methods and test procedures - Fibre geometry (IEC 60793-1-20:2014) Fibr
6、es optiques - Partie 1-20: Mthodes de mesure et procdures dessai - Gomtrie de la fibre (CEI 60793-1-20:2014) Lichtwellenleiter - Teil 1-20: Messmethoden und Prfverfahren - Fasergeometrie (IEC 60793-1-20:2014) This European Standard was approved by CENELEC on 2014-11-14. CENELEC members are bound to
7、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 application to the CEN-CEN
8、ELEC 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 CEN-CENELEC Management Centr
9、e 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, Hungary, Iceland, Ireland, Italy
10、, 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 Europisches Komitee fr El
11、ektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 60793-1-20:2014 E BS EN 60793-1-20:2014EN 60793-1-20:2014 - 2 - Foreword The text of docum
12、ent 86A/1562/CDV, future edition 1 of IEC 60793-1-20, prepared by SC 86A “Fibres and cables“ of IEC/TC 86 “Fibre optics“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60793-1-20:2014. The following dates are fixed: latest date by which the document has to be implemente
13、d at national level by publication of an identical national standard or by endorsement (dop) 2015-08-14 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2017-11-14 This document supersedes EN 60793-1-20:2002. Attention is drawn to the possibility t
14、hat 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 60793-1-20:2014 was approved by CENELEC as a European Standard
15、without any modification. In the official version, for Bibliography, the following note has to be added for the standard indicated : IEC 60793-1-45 NOTE Harmonized as EN 60793-1-45. BS EN 60793-1-20:2014- 3 - EN 60793-1-20:2014 Annex ZA (normative) Normative references to international publications
16、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 latest edition of the referenced docum
17、ent (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 this annex is available here: www.cenel
18、ec.eu. Publication Year Title EN/HD Year 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 - Optical fibres - Part 2-20: Product specifications - Sectional specification for category A2 multim
19、ode 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 - Part 2-40: Product specifications - Sectional specification for category A4 multimode fibres EN
20、60793-2-40 - IEC 60793-2-50 - Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres EN 60793-2-50 - IEC 60793-2-60 - Optical fibres - Part 2-60: Product specifications - Sectional specification for category C single-mode intraconnection fibres EN
21、 60793-2-60 - IEC 61745 - End-face image analysis procedure for the calibration of optical fibre geometry test sets - - BS EN 60793-1-20:2014 2 IEC 60793-1-20:2014 IEC 2014 CONTENTS INTRODUCTION . 7 1 Scope 8 2 Normative references 8 3 Terms, definitions and symbols 8 4 Overview of method . 10 4.1 G
22、eneral . 10 4.2 Scanning methods 10 4.2.1 General . 10 4.2.2 One-dimensional scan sources of error 11 4.2.3 Multidimensional scanning . 12 4.3 Data reduction 13 4.3.1 Simple combination of few-angle scan sets 13 4.3.2 Ellipse fitting of several-angle or raster data sets . 13 5 Reference test method
23、13 6 Apparatus 13 7 Sampling and specimens . 13 7.1 Specimen length . 13 7.2 Specimen end face . 13 8 Procedure 13 9 Calculations . 14 10 Results 14 11 Specification information . 14 Annex A (normative) Requirements specific to Method A Refracted near-field. 15 A.1 Introductory remarks . 15 A.2 Appa
24、ratus . 15 A.2.1 Typical arrangement 15 A.2.2 Source . 15 A.2.3 Launch optics 15 A.2.4 XYZ positioner (scanning stage) . 16 A.2.5 Blocking disc . 16 A.2.6 Collection optics and detector 17 A.2.7 Computer system . 17 A.2.8 Immersion cell . 17 A.3 Sampling and specimens 17 A.4 Procedure . 17 A.4.1 Loa
25、d and centre the fibre . 17 A.4.2 Line scan . 18 A.4.3 Raster scan . 18 A.4.4 Calibration . 18 A.5 Index of refraction calculation . 18 A.6 Calculations 20 A.7 Results . 20 Annex B (normative) Requirements specific to Method B Transmitted near-field . 21 B.1 Introductory remarks . 21 BS EN 60793-1-2
26、0:2014IEC 60793-1-20:2014 IEC 2014 3 B.2 Apparatus . 21 B.2.1 Typical arrangement 21 B.2.2 Light sources . 22 B.2.3 Fibre support and positioning apparatus 23 B.2.4 Cladding mode stripper 23 B.2.5 Detection . 23 B.2.6 Magnifying optics . 24 B.2.7 Video image monitor (video grey-scale technique) . 25
27、 B.2.8 Computer. 25 B.3 Sampling and specimens 25 B.4 Procedure . 26 B.4.1 Equipment calibration 26 B.4.2 Measurement . 26 B.5 Calculations 27 B.6 Results . 27 Annex C (normative) Edge detection and edge table construction 28 C.1 Introductory remarks . 28 C.2 Boundary detection by decision level 28
28、C.2.1 General approach 28 C.2.2 Class A multimode fibre core reference level and k factor 29 C.2.3 Class B and C single-mode fibres 30 C.2.4 Direct geometry computation of one-dimensional data . 30 C.3 Assembling edge tables from raw data 31 C.3.1 General . 31 C.3.2 Edge tables from raster data 31 C
29、.3.3 Edge tables from multi-angular one-dimensional scans 32 Annex D (normative) Edge table ellipse fitting and filtering. 33 D.1 Introductory remarks . 33 D.2 General mathematical expressions for ellipse fitting 33 D.3 Edge table filtering 34 D.4 Geometric parameter extraction 35 Annex E (informati
30、ve) Fitting category A1 core near-field data to a power law model . 36 E.1 Introductory remarks . 36 E.2 Preconditioning data for fitting 36 E.2.1 Motivation 36 E.2.2 Transformation of a two-dimensional image to one-dimensional radial near-field . 36 E.2.3 Pre-processing of one-dimensional near-fiel
31、d data 39 E.2.4 Baseline subtraction 41 E.3 Fitting a power-law function to an category A1 fibre near-field profile 41 Annex F (informative) Mapping class A core diameter measurements 43 F.1 Introductory remarks . 43 F.2 Mapping function 43 Bibliography 44 Figure 1 Sampling on a chord 11 Figure 2 Sc
32、an of a non-circular body 12 Figure A.1 Refracted near-field method Cell 16 BS EN 60793-1-20:2014 4 IEC 60793-1-20:2014 IEC 2014 Figure A.2 Typical instrument arrangement 16 Figure A.3 Typical index profile line scan of a category A1 fibre 19 Figure A.4 Typical raster index profile on a category A1
33、fibre . 19 Figure B.1 Typical arrangement, grey scale technique . 21 Figure B.2 Typical arrangement, mechanical scanning technique . 22 Figure B.3 Typical 1-D near-field scan, category A1 core . 26 Figure B.4 Typical raster near-field data, category A1 fibre 27 Figure C.1 Typical one-dimensional dat
34、a set, cladding only . 29 Figure C.2 Typical graded index core profile 30 Figure C.3 Raster data, cladding only 31 Figure E.1 Filtering concept . 38 Figure E.2 Illustration of 1-D near-field preconditioning, typical video line 40 BS EN 60793-1-20:2014IEC 60793-1-20:2014 IEC 2014 7 INTRODUCTION This
35、standard gives two methods for measuring fibre geometry characteristics: Method A: Refracted near-field, described in Annex A; Method B: Transmitted near-field, described in Annex B. Methods A and B apply to the geometry measurement of all class A multimode fibres, class B single-mode fibres and cla
36、ss C single-mode interconnection fibres. The fibres applicable product specifications, IEC 60793-2-10, IEC 60793-2-20, IEC 60793-2-30, IEC 60793-2-40, IEC 60793-2-50 and IEC 60793-2-60, provide relevant measurement details, including sample lengths and k factors. The geometric parameters measurable
37、by the methods described in this standard are as follows: cladding diameter; cladding non-circularity; core diameter (class A fibre only); core non-circularity (class A fibre only); core-cladding concentricity error. NOTE 1 The core diameter of class B and class C fibres is not specified. The equiva
38、lent parameter is mode field diameter, determined by IEC 60793-1-45. NOTE 2 These methods specify both one-dimensional (1-D) and two-dimensional (2-D) data collection techniques and data analyses. The 1-D methods by themselves cannot detemine non-circularity nor concentricity error. When non-circula
39、r bodies are measured with 1-D methods, body diameters suffer additional uncertainties. These limitations may be overcome by scanning and analysing multiple 1-D data sets. Clause 5 provides further information. Information common to both methods appears in Clauses 2 through 10, and information perta
40、ining to each individual method appears in Annexes A and B, respectively. Annex C describes normative methods used to find the optical boundaries of the core and the cladding, Annex D describes normative procedures to fit ellipses to sets of detected boundaries. Annex E provides an informative fitti
41、ng procedure of power-law models to graded-index core profiles. Annex F describes an informative methodology relating to the transformation of core diameter measurements determined with methods other than the reference method to approximate reference method values. BS EN 60793-1-20:2014 8 IEC 60793-
42、1-20:2014 IEC 2014 OPTICAL FIBRES Part 120: Measurement methods and test procedures Fibre geometry 1 Scope This part of IEC 60793 establishes uniform requirements for measuring the geometrical characteristics of uncoated optical fibres. The geometry of uncoated optical fibres directly affect splicin
43、g, connectorization and cabling and so are fundamental parameters requiring careful specification, quality control, and thus measurement. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For da
44、ted references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60793-2-10, Optical fibres Part 2-10: Product specifications Sectional specification for category A1 multimode fibres IEC 60793-2-20, Optical
45、fibres Part 2-20: Product specifications Sectional specification for category A2 multimode fibres IEC 60793-2-30, Optical fibres Part 2-30: Product specifications Sectional specification for category A3 multimode fibres IEC 60793-2-40, Optical fibres Part 2-40: Product specifications Specification f
46、or category A4 multimode fibres IEC 60793-2-50, Optical fibres Part 2-50: Product specifications Sectional specification for class B single-mode fibres IEC 60793-2-60, Optical fibres Part 2-60: Product specifications Sectional specification for category C single-mode intraconnection fibres IEC 61745
47、, End-face image analysis procedure for the calibration of optical fibre geometry test sets 3 Terms, definitions and symbols 3.1 Terms and definitions For the purposes of this document, the following terms, definitions and symbols apply: 3.1.1 body general term describing an entity whose geometry is
48、 measured (i.e. cladding or core) BS EN 60793-1-20:2014IEC 60793-1-20:2014 IEC 2014 9 3.1.2 reference point fixed coordinate in the scans plane Note 1 to entry: This point is arbitrary (say the lower left corner of a video image, or the rough centre of the fibre after the fibre is located in a scann
49、ing apparatus). 3.1.3 centre centre of a body in the measurement plane with respect to the reference point, expressed in micrometres 3.1.4 diameter average diameter, in micrometres, of a nearly circular body 3.1.5 non-circularity difference between the maximum and minimum radial deviation from the bodys centre, normalized to the bodys diameter, expressed as a per cent 3.1.6 concentricity error scalar distance, in micrometres between t
