EN 60793-1-20:2002

STANDARDOptična vlakna – 1-20. del: Metode merjenja in preskusni postopki - Geometrija vlakna (IEC 60793-1-20:2001)*Optical fibres - Part 1-20: Measurement methods and test procedures - Fibre geometry (IEC 60793-1-20:2001)©
Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljenoReferenčna številkaSIST EN 60793-1-20:2004(en)ICS33.180.10

EUROPEAN STANDARDEN 60793-1-20NORME EUROPÉENNEEUROPÄISCHE NORMMarch 2002CENELECEuropean Committee for Electrotechnical StandardizationComité Européen de Normalisation ElectrotechniqueEuropäisches Komitee für Elektrotechnische NormungCentral Secretariat: rue de Stassart 35, B - 1050 Brussels© 2002 CENELEC -All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.Ref. No. EN 60793-1-20:2002 EICS 33.180.10Partly supersedes EN 188000:1992English versionOptical fibresPart 1-20: Measurement methods and test procedures –Fibre geometry(IEC 60793-1-20:2001)Fibres optiquesPartie 1-20: Méthodes de mesureet procédures d'essai –Géométrie de la fibre(CEI 60793-1-20:2001)LichtwellenleiterTeil 1-20: Messmethodenund Prüfverfahren –Fasergeometrie(IEC 60793-1-20:2001)This European Standard was approved by CENELEC on 2002-03-05. CENELEC members are bound tocomply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration.Up-to-date lists and bibliographical references concerning such national standards may be obtained onapplication to the Central Secretariat or to any CENELEC member.This European Standard exists in three official versions (English, French, German). A version in any otherlanguage made by translation under the responsibility of a CENELEC member into its own language andnotified to the Central Secretariat has the same status as the official versions.CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands,Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.

- 3 -EN 60793-1-20:2002Annex ZA(normative)Normative references to international publicationswith their corresponding European publicationsThis European Standard incorporates by dated or undated reference, provisions from otherpublications. These normative references are cited at the appropriate places in the text and thepublications are listed hereafter. For dated references, subsequent amendments to or revisions of anyof these publications apply to this European Standard only when incorporated in it by amendment orrevision. For undated references the latest edition of the publication referred to applies (includingamendments).NOTEWhen an international publication has been modified by common modifications, indicated by (mod), the relevantEN/HD applies.PublicationYearTitleEN/HDYearIEC 61745- 1)End-face image analysis procedure forthe calibration of optical fibre geometrytest sets--
1) Undated reference.
NORMEINTERNATIONALECEIIECINTERNATIONALSTANDARD60793-1-20Première éditionFirst edition2001-09Fibres optiques –Partie 1-20:Méthodes de mesure et procédures d'essai –Géométrie de la fibreOptical fibres –Part 1-20:Measurement methods and test procedures –Fibre geometry Commission Electrotechnique Internationale International Electrotechnical CommissionPour prix, voir catalogue en vigueurFor price, see current catalogue IEC 2001
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60793-1-20 © IEC:2001– 3 –CONTENTSFOREWORD.5INTRODUCTION.91Scope.112Normative references.113Overview of method.114Definitions.135Reference test method.156Apparatus.157Sampling and specimens.158Procedure.159Calculations.1710Results.1711Specification information.17Annex A (normative)
Requirements specific to method A – Refracted near-field.19Annex B (normative)
Requirements specific to method B – Transverse interference.27Annex C (normative)
Requirements specific to method C – Near-field light distribution.35Annex D (normative)
Requirements specific to method D – Mechanical diameter.47Bibliography.53Figure A.1 – Refracted near-field method — Schematic diagram.21Figure A.2 – Typical arrangement of the refracted near-field test set.21Figure B.1 – Test apparatus.27Figure B.2 – Refractive index profile – Ring pattern.33Figure C.1 – Cross-sectional core diameter – Near-field intensity scan, option 1.43Figure C.2 – Cross-sectional core diameter – Near-field intensity scan, option 2.45Figure C.3 – Near-field intensity distribution in the region of the core-cladding boundary.45Figure D.1 – Top view of a typical electronic micrometer system.47Table 1 – Measurement methods.13

60793-1-20 © IEC:2001– 5 –INTERNATIONAL ELECTROTECHNICAL COMMISSION_____________OPTICAL FIBRES –Part 1-20: Measurement methods and test procedures –Fibre geometryFOREWORD1)The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprisingall national electrotechnical committees (IEC National Committees). The object of the IEC is to promoteinternational co-operation on all questions concerning standardization in the electrical and electronic fields. Tothis end and in addition to other activities, the IEC publishes International Standards. Their preparation isentrusted to technical committees; any IEC National Committee interested in the subject dealt with mayparticipate in this preparatory work. International, governmental and non-governmental organizations liaisingwith the IEC also participate in this preparation. The IEC collaborates closely with the International Organizationfor Standardization (ISO) in accordance with conditions determined by agreement between the twoorganizations.2)The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, aninternational consensus of opinion on the relevant subjects since each technical committee has representationfrom all interested National Committees.3)The documents produced have the form of recommendations for international use and are published in the formof standards, technical specifications, technical reports or guides and they are accepted by the NationalCommittees in that sense.4)In order to promote international unification, IEC National Committees undertake to apply IEC InternationalStandards transparently to the maximum extent possible in their national and regional standards. Anydivergence between the IEC Standard and the corresponding national or regional standard shall be clearlyindicated in the latter.5)The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for anyequipment declared to be in conformity with one of its standards.6)Attention is drawn to the possibility that some of the elements of this International Standard may be the subjectof patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.International Standard IEC 60793-1-20 has been prepared by subcommittee 86A: Fibres andcables, of IEC technical committee 86: Fibre optics.This standard, together with the other standards in the IEC 60793-1-2X series, cancels andreplaces the first edition of IEC 60793-1-2, of which it constitutes a technical revision.The text of this standard is based on the following documents:FDISReport on voting86A/685/FDIS86A/724/RVDFull information on the voting for the approval of this standard can be found in the report onvoting indicated in the above table.This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.Annexes A, B, C and D form an integral part of this standard.

60793-1-20 © IEC:2001– 7 –IEC 60793-1-2X consists of the following parts, under the general title: Optical fibres:• Part 1-20: Measurement methods and test procedures – Fibre geometry• Part 1-21: Measurement methods and test procedures – Coating geometry• Part 1-22: Measurement methods and test procedures – Length measurementThe committee has decided that the contents of this publication will remain unchangeduntil 2003. At this date, the publication will be•reconfirmed;•withdrawn;•replaced by a revised edition, or•amended.

60793-1-20 © IEC:2001– 9 –INTRODUCTIONPublications in the IEC 60793-1 series concern measurement methods and test procedures asthey apply to optical fibres.Within the same series several different areas are grouped, as follows:• parts 1-10 to 1-19:General• parts 1-20 to 1-29:Measurement methods and test procedures for dimensions• parts 1-30 to 1-39:Measurement methods and test procedures for mechanical charac-teristics• parts 1-40 to 1-49:Measurement methods and test procedures for transmission and opticalcharacteristics• parts 1-50 to 1-59:Measurement methods and test procedures for environmental charac-teristics.

60793-1-20 © IEC:2001– 11 –OPTICAL FIBRES –Part 1-20: Measurement methods and test procedures –Fibre geometry1 ScopeThis part of IEC 60793 establishes uniform requirements for measuring the geometricalcharacteristics of uncoated optical fibres.The geometrical characteristics of uncoated optical fibres are fundamental values and arenecessary for carrying out subsequent procedures such as handling, splicing, connectorization,cabling and measurements.2 Normative referencesThe following referenced documents are indispensable for the application of this document. Fordated references, only the edition cited applies. For undated references, the latest edition ofthe referenced document (including any amendments) applies.IEC 61745, End-face image analysis procedure for the calibration of optical fibre geometry testsets3 Overview of methodThis standard gives four methods for measuring fibre geometry characteristics which are givenin terms of the following parameters:–cladding diameter;–cladding non-circularity;–core diameter (category A fibre only);–core non-circularity (category A fibre only);–core-cladding concentricity error;–theoretical numerical aperture (optional – category A fibre only).

60793-1-20 © IEC:2001– 13 –Table 1 – Measurement methodsMethodCharacteristics coveredFibre category(ies) coveredFormerdesignationA Refracted near
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