1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-20498-3 SANS 60793-1-46:2001Edition 1 and nat. amdt 1IEC 60793-1-46:2001Edition 1Any reference to SABS IEC 60793-1-46 is deemedto be a ref
4、erence to this standard(Government Notice No. 1373 of 8 November 2002)SOUTH AFRICAN NATIONAL STANDARD Optical fibres Part 1-46: Measurement methods and test procedures Monitoring of changes in optical transmittance This national standard is the identical implementation of IEC 60793-1-46:2001 and is
5、adopted with the permission of the International Electrotechnical Commission. Published by Standards South Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 60793-1-46:2001 Ed
6、ition 1 and nat. amdt 1 IEC 60793-1-46:2001 Edition 1 Table of changes Change No. Date Scope Nat. amdt 1 2007 Amended to change the designation from SABS to SANS, with no technical changes. National foreword This South African standard was approved by National Committee StanSA SC 74A, Communication
7、technology Fibre optics, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in September 2007. This SANS document supersedes SABS IEC 60793-1-46:2001 (edition 1). NORMEINTERNATIONALECEIIECINTERNATIONALSTANDAR
8、D60793-1-46Premire ditionFirst edition2001-07Fibres optiques Partie 1-46:Mthodes de mesure et procdures dessai Contrle des variations du facteur detransmission optiqueOptical fibres Part 1-46:Measurement methods and test procedures Monitoring of changes in optical transmittanceCommission Electrotech
9、nique InternationaleInternational Electrotechnical CommissionPour prix, voir catalogue en vigueurFor price, see current catalogue IEC 2001 Droits de reproduction rservs Copyright - all rights reservedAucune partie de cette publication ne peut tre reproduite niutilise sous quelque forme que ce soit e
10、t par aucun procd,lectronique ou mcanique, y compris la photocopie et lesmicrofilms, sans laccord crit de lditeur.No part of this publication may be reproduced or utilized inany form or by any means, electronic or mechanical,including photocopying and microfilm, without permission inwriting from the
11、 publisher.International Electrotechnical Commission 3, rue de Varemb Geneva, SwitzerlandTelefax: +41 22 919 0300 e-mail: inmailiec.ch IEC web site http:/www.iec.chCODE PRIXPRICE CODELSANS 60793-1-46:2001This s tandard may only be used and printed by approved subscription and freemailing clients of
12、the SABS .60793-1-46 IEC:2001 3 CONTENTSFOREWORD 5INTRODUCTION 91 Scope 112 Normative references . 113 Reference test method . 114 Apparatus 115 Sampling and specimens 135.1 Specimen length . 135.2 Specimen end face . 135.3 Specimen preparation . 135.4 Reference specimen . 136 Procedure 137 Calculat
13、ions .138 Results 138.1 Information to be provided with each measurement . 138.2 Information available upon request 139 Specification information 15Annex A (normative) Requirements specific to method A Change in transmittance bytransmitted power. 17Annex B (normative) Requirements specific to method
14、 B Change in transmittance bybackscattering 23Figure A.1 Measurement of change in optical transmittance using reference specimen. 19Figure A.2 Measurement of change in optical transmittance using stabilized source . 19SANS 60793-1-46:2001This s tandard may only be used and printed by approved subscr
15、iption and freemailing clients of the SABS .60793-1-46 IEC:2001 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION_OPTICAL FIBRES Part 1-46: Measurement methods and test procedures Monitoring of changes in optical transmittanceFOREWORD1) The IEC (International Electrotechnical Commission) is a worldwide or
16、ganization 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 activiti
17、es, 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 part
18、icipate 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 possib
19、le, 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 specificati
20、ons, 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
21、. 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 stan
22、dards.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 60793-1-46 has been prepared by subcommittee 86A:
23、 Fibres andcables, of IEC technical committee 86: Fibre optics.This standard, together with the other standards in the IEC 60793-1-4X series, replacesthe second edition of IEC 60793-1-4, of which it constitutes a technical revision.The text of this standard is based on the following documents:FDIS R
24、eport on voting86A/675/FDIS 86A/699/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 3.Annexes A and B form an integral part of this s
25、tandard.IEC 60793-1-1 and IEC 60793-1-2 cover generic specifications.SANS 60793-1-46:2001This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .60793-1-46 IEC:2001 7 IEC 60793-1-4X consists of the following parts, under the general title: Optical fi
26、bres: Part 1-40: Measurement methods and test procedures Attenuation Part 1-41: Measurement methods and test procedures Bandwidth Part 1-42: Measurement methods and test procedures Chromatic dispersion Part 1-43: Measurement methods and test procedures Numerical aperture Part 1-44: Measurement metho
27、ds and test procedures Cut-off wavelength Part 1-45: Measurement methods and test procedures Mode field diameter Part 1-46: Measurement methods and test procedures Monitoring of changes in opticaltransmittance Part 1-47: Measurement methods and test procedures Macrobending loss Part 1-48: Measuremen
28、t methods and test procedures Under consideration Part 1-49: Measurement methods and test procedures Under considerationThe committee has decided that the contents of this publication will remain unchanged until2003. At this date, the publication will bereconfirmed;withdrawn;replaced by a revised ed
29、ition, oramended.SANS 60793-1-46:2001This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .60793-1-46 IEC:2001 9 INTRODUCTIONPublications in the IEC 60793-1 series concern measurement methods and test procedures asthey apply to optical fibres.Withi
30、n 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 mechanicalcharacteristics parts 1-40 to 1-49: Measurement methods
31、and test procedures for transmission and opticalcharacteristics parts 1-50 to 1-59: Measurement methods and test procedures for environmentalcharacteristics.SANS 60793-1-46:2001This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .60793-1-46 IEC:20
32、01 11 OPTICAL FIBRES Part 1-46: Measurement methods and test procedures Monitoring of changes in optical transmittance1 ScopeThis part of IEC 60793 establishes uniform requirements for the monitoring of changes inoptical transmittance, thereby assisting in the inspection of fibres and cables for com
33、mercialpurposes.This standard gives two methods for monitoring the changes in optical transmittance of opticalfibres and cables that occur during mechanical or environmental testing, or both. It provides amonitor in the change of optical transmission characteristics arising from optical discontinuit
34、y,physical defects and modifications of the attenuation slope: method A: change in transmittance by transmitted power; method B: change in transmittance by backscattering.Methods A and B apply to the monitoring of all categories of the following fibres: class A: multimode fibres; class B: single-mod
35、e fibres.Information common to both measurements is contained in clauses 1 to 8, and informationpertaining to each individual method appears in annexes A, and B respectively.2 Normative referencesThe following normative documents contain provisions which, through reference in this text,constitute pr
36、ovisions of this International Standard. For dated references, subsequentamendments to, or revisions of, any of these publications do not apply. However, parties toagreements based on this International Standard are encouraged to investigate the possibilityof applying the most recent editions of the
37、 normative documents indicated below. For undatedreferences, the latest edition of the normative document referred to applies. Members of IECand ISO maintain registers of currently valid International Standards.IEC 60793-1-40, Optical fibres Part 1-40: Measurement methods and test procedures Attenua
38、tion3 Reference test methodUnder consideration.4 ApparatusAnnexes A and B include layout drawings and other equipment requirements that individuallyapply for each of the methods, respectively.SANS 60793-1-46:2001This s tandard may only be used and printed by approved subscription and freemailing cli
39、ents of the SABS .60793-1-46 IEC:2001 13 5 Sampling and specimens5.1 Specimen lengthThe minimum length of the specimen shall be such that the changes in attenuation arecompatible with the resolution of the measurement apparatus, and the non-linearities at thebeginning and end of it shall not affect
40、the results.5.2 Specimen end facePrepare a flat end face, orthogonal to the fibre axis, at the input and output ends of eachspecimen.5.3 Specimen preparationPrepare the specimen as described in the appropriate mechanical, environmental, or other testmethod specified.5.4 Reference specimenIn methods
41、where a reference specimen is used, it shall comprise an identical kind of opticalfibre or cable to the specimen and shall be linked between the optical divider and detector, asshown in figure A.1. It may be a short length of fibre. The condition of the reference specimenshall be constant during the
42、 whole test.6 ProcedureFor individual procedures, see annexes A and B for methods A and B, respectively.7 CalculationsFor calculation procedures, see the appropriate annex: A and B, respectively.8 Results8.1 Information to be provided with each measurementReport the following information with each m
43、easurement: date and title of measurement; identification of specimen; optical source wavelength, ; specimen length; conditions of the environment and measurement equipment; changes in optical transmittance, D; = 1,2,3, . preferably plotted in a graph versus testparameters.8.2 Information available
44、upon requestThe following information shall be available upon request: measurement method used: A or B; type of optical source used and its spectral width (FWHM);SANS 60793-1-46:2001This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .60793-1-46 I
45、EC:2001 15 launching technique used; description of all key equipment; details of computation technique; date of latest calibration of measurement equipment.9 Specification informationThe detail specification shall specify the following information: type of fibre to be measured; failure or acceptanc
46、e criteria; information to be reported; any deviations from the procedure that apply.SANS 60793-1-46:2001This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .60793-1-46 IEC:2001 17 Annex A (normative)Requirements specific to method A Change in tra
47、nsmittance by transmitted powerA.1 ApparatusA.1.1 GeneralThe arrangement shall provide a monitoring for optical transmittance with high resolution andgood stability over the time and temperature changes given in the relevant productspecification.Figure A.1 is an example of a typical arrangement suit
48、able for use when carrying outmechanical or environmental tests in a laboratory or factory. By comparison with a referencesample, it provides a measurement of the change in optical transmittance, corrected for anychanges that might occur in the optical source. Connections shall have stable couplingc
49、onditions.Figure A.2 is an example of a typical arrangement suitable for use in the field, laboratory orfactory where long-term tests are required, in cases where it is possible to stabilize the opticalsource by optical feedback. If the stability of the optical source is compatible with the accuracyneeded for the measurement, then the insertion loss measurement method (method B ofIEC 60793-1-40) may be used.A.1.2 Optical sourceUse an s
