1、BRITISH STANDARD Optical fibres Part 1-22: Measurement methods and test procedures- Length measurement The European Standard EN 60793-1-22:2002 has the status of a British Standard ICs 33.180.10 BS EN 60793- 1-22: 2002 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 6079
2、3-1-2212002 Amd. No. National foreword This British Standard is the official English language version of EN 60793-1-22:2002. It is identical with IEC 60793-1-22:2001. It partly supersedes BS EN 188000:1994 which will be withdrawn upon completion of the full BS EN 60793-1 series. The UKparticipation
3、in its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/1, Optical fibres and cables, which has the responsibility to: Date Comments This British Standard, having been prepared under the direction of the Electrotechnical Sector Policy and Strategy Committ
4、ee, was published under the authority of the Standards Policy and Strategy Committee on 6 June 2002 - - aid enquirers to understand the text; present to the responsible internationalA3uropean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed;
5、monitor related international and European developments and promulgate them in the UK. - A list of organizations represented on this subcommittee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27
6、-1 has been renumbered as IEC 60027-1. For a period of time during the change over fi-om one numbering system to the other, publications may contain identifiers from both systems. Cros s-r e fer en ces The British Standards which implement international or European publications referred to in this d
7、ocument may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users o
8、f British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 31, and a back cover. The BSI
9、copyright date displayed in this document indicates when the document was last issued. OBSI 6 June 2002 ISBN O 580 39767 X EUROPEAN STANDARD EN 60793-1 -22 NORME EUROPENNE EUROPISCHE NORM March 2002 ICs 33.180.10 Partly supersedes EN 188000:1992 English version Optical fibres Part 1-22: Measurement
10、methods and test procedures - Length measurement (IEC 60793-1 -2212001) Fibres optiques Partie 1-22: Mthodes de mesure et procdures dessai - Mesure de la longueur (CE1 60793-1 -2212001) L ic h twe I le n le i ter Teil 1-22: Messmethoden und Prfverfahren - Lngen messu ng (IEC 60793-1-22:2001) This Eu
11、ropean Standard was approved by CENELEC on 2002-03-05. CENELEC members are bound to comply with the CENKENELEC 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 referenc
12、es concerning such national standards may be obtained on application to the Central Secretariat 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 memb
13、er into its own language and notified to the Central Secretariat has the same status as the oficial versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Nethe
14、rlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels O 2002
15、CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60793-1-22:2002 E Page 2 EN 60793-1-222002 EN 60793-2-XX Foreword Optical fibres - Part 2-XX: Product specifications EN 188100:1995 EN 188101:1995 EN 188102:1995 EN 1 88200: 1995 EN
16、188201:1995 EN 1 88202: 1995 The text of document 86A/687/FDIS, future edition 1 of IEC 60793-1-22, prepared by SC 86A, Fibres and cables, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60793-1-22 on 2002-03-05. This European Standard sup
17、ersedes subclause 2.10 (test method 105), subclause 2.1 1 (test method 106) and subclause 4.7 (test method 303) of EN 188000:1992. The following dates were fixed: - latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement
18、- latest date by which the national standards conflicting with the EN have to be withdrawn (dop) 2002-12-01 (dow) 2005-03-01 Annexes designated “normative“ are part of the body of the standard. In this standard, annexes A, B, C, D, E and ZA are normative. Annex ZA has been added by CENELEC. Compared
19、 to IEC 60793-1:1989 and IEC 60793-2:1992, IEC/SC 86A has adopted a revised structure of the new IEC 60793 series: The individual measurement methods and test procedures for optical fibres are published as “Part 1-XX“; the product standards are published as “Part 2-XX“. The general relationship betw
20、een the new series of EN 60793 and the superseded European Standards of the EN 188000 series is as follows: EN I Title I su Ders edes EN 60793-1-XX Optical fibres - Part 1-XX: Measurement methods Individual subclauses of I and test Drocedures I EN 188000:1992 En do rsemen t not i ce The text of the
21、International Standard IEC 60793-1-22:2001 was approved by CENELEC as a European Standard without any modification. O BSI 6 June 2002 Page 3 EN 60793-1-222002 CONTENTS INTRODUCTION . 5 Scope . 6 Norm at ive references 6 Overview of method . 6 3.1 3.2 Method B - Backscattering 7 3.3 Method C - Fi 3.4
22、 Method D - Mechanical length . 7 3.5 Method E - Phase shift 7 3.6 Reference test method 7 Apparatus . 7 Sampling and specimens 8 Procedure . 8 8 . 8 Method A - Delay measuring Res u Its Specification information . 8 Annex A (normative) Requirements specific to method A - Delay measuring . 9 Annex B
23、 (normative) Requirements specific to method B - Backscattering 14 Annex C (normative) Requirements specific to method C - Fibre elongation . 21 Annex D (normative) Requirements specific to method D - Mechanical length 24 Annex E (normative) Requirements specific to method E - Phase shift . 25 Annex
24、 ZA (normative) Normative references to international publications with their corresponding European publications 31 Figure A.l - Time measurement of the transmitted pulse 1 O Figure A.2 - Time measurement of the reflected pulse 10 12 . 14 Figure A.3 - Principle of fibre-length measurement . Figure
25、B.l - Block diagram of an OTDR . pulse from the fibre joint point (two-point technique (B.4.3.1) Figure B.2 - Schematic OTDR trace of a specimen (zl to ZO) with a section (e.g. dead-zone fibre) of unknown length, ZI, preceding it and without a reflection . 18 O BSI 6 June 2002 Page 4 EN 60793-1-2220
26、02 Figure B.3 - Schematic OTDR trace of specimen (zl fo z2) with a section (e.g. dead- zone fibre) of unknown length, z1, preceding it and with a reflection pulse from the fibre joint point (two-point technique (B.4.3.1) 18 Figure B.4 - Schematic trace of a specimen (O to z2) with no section precedi
27、ng it (single-point technique (B.4.3.2) . 19 Figure B.5 - Schematic OTDR trace of a specimen (ZD to z2) with a section (e.g. dead- zone fibre) of known length, ZD, preceding it (single-point technique (B.4.3.3) . 19 Figure C.l - Equipment set-up for phase-shift technique (C.2.2.1) . 22 Figure C.2 -
28、Equipment set-up for differential pulse-delay technique (C.2.2.2) . 22 Figure E.l - Apparatus for fibre length measurement 30 Table 1 - Measurement methods 6 O BSI 6 June 2002 Page 5 EN 60793-1-222002 INTRODUCTION Publications in the IEC 60793-1 series concern measurement methods and test procedures
29、 as they 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- ter ist
30、ics parts 1-40 to 1-49: Measurement methods and test procedures for transmission and optical characteristics Measurement methods and test procedures for environmental charac- teristics. parts 1-50 to 1-59: O BSI 6 June 2002 Page 6 EN 60793-1-222002 B Backscattering C Fibre elongation a D Mechanical
31、OPTICAL FIBRES - Length All AI and all B IEC 60793-1-CIC Fibre elongation AI and BI b IEC 60793-I-A7 Length All IEC 60793-1-A5 Part 1-22: Measurement methods and test procedures - Length measurement 1 Scope This part of IEC 60793 establishes uniform requirements for measuring the length and elongati
32、on of optical fibre (typically within cable). The length of an optical fibre is one of the most fundamental values and shall be known for the evaluation of transmission characteristics such as losses and bandwidths. 2 Normative references The following referenced documents are indispensable for the
33、application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60793-1-40, Opfical fibres - Parf 1-40: Measuremenf mefhods and fesf procedures - Affenuafion IEC 60793-1-
34、42, Opfical fibres - Parf 1-42: Measuremenf mefhods and fesf procedures - Chromafic dispersion IEC 60794-1-1, Opfical fibre cables - Parf 1-1: Generic specificafion - General 3 Overview of method This standard gives five methods for measuring length, which are presented in the following table 1. Tab
35、le 1 - Measurement methods I I Characteristics Fibre category(ies) Former covered covered designation Method I A Delay measuring I Length I All AI and all B I IEC 60793-I-A6 I E Phase shift I Length I All AI and all B I IEC 60793-I-A8 a optic cables, such as those in IEC 60794-1-1. The measurement o
36、f fibre elongation, method C, is part of several measurement methods for fibres and fibre This measurement is applicable unreservedly to type B single-mode fibres. For type AI multimode fibres, take particular care when interpreting the results because the results of this measurement may be influenc
37、ed by interfering modal effects, for example, due to the occurrence of non-longitudinal stresses on the fibre. Application of the measurement to A2 to A4 multimode fibres is under consideration. O BSI 6 June 2002 Page 7 EN 60793-1-222002 Information common to all measurements is contained in clauses
38、 2 to 8. Information on specific application appears in annexes A, B, C, D, and E for methods A, B, C, D and E, respectively. 3.1 The delay measuring method applies to measurements of the fibre length by the measurement of the propagation time of an optical pulse or a pulse train on the basis of a k
39、nown value of the group index of the fibre. Method A - Delay measuring Alternatively, this method is suitable for measuring the group index of a fibre of known length. Therefore, in practice this fibre length measurement method is calibrated against a known length of fibre of the same type. 3.2 Meth
40、od B - Backscattering The backscattering method, which is a single-sided measurement, uses an optical time domain reflectometer (OTDR), and measures the optical power backscattered from different points in the fibre to the beginning of the fibre. 3.3 This measurement method describes a procedure for
41、 determining the fibre elongation. It does not measure absolute strain, but instead measures the changes in strain from one loading condition to another. Method C - Fibre elongation 3.4 This measurement method describes a procedure for determining the fibre length by winding a fibre around a fixed d
42、iameter calibrated wheel that rotates. The length is determined by the number of revolutions of the wheel. Method D - Mechanical length 3.5 Method E - Phase shift The phase shift method describes a procedure for determining the fibre length. The length is determined from the phase shift that occurs
43、when a predetermined modulation frequency fma, is applied. 3.6 Reference test method The reference test method (RTM), which shall be the one used to settle disputes, varies depending on whether the fibre is cabled or not, such as - uncabled fibre: method D; - length of fibre within cable: method B;
44、- elongation of fibre within cable: method C; - elongation of uncabled fibre: method C. 4 Apparatus Annexes A, B, C, D and E include layout drawings and other equipment requirements for each of the methods A, B, C, D and E, respectively. O BSI 6 June 2002 Page 8 EN 60793-1-222002 5 Sampling and spec
45、imens See the appropriate annex A, B, C, D or E for specific requirements. General requirements fo I low. Prepare a flat end face, perpendicular to the fibre axis, at the input and output ends of each specimen for measurements based on optical delay measurements. 6 Procedure See the appropriate anne
46、x A, B, C, D or E for specific requirements. 7 Calculations See the appropriate annex A, B, C, D or E for specific requirements. 8 Results The following information shall be provided with each measurement: - date and title of measurement; - identification and description of specimen, including wheth
47、er fibre or cable; - specimen length, or elongation; - measurement method used: A, B, C, D or E; - other results, as required by the appropriate annex, A, B, C, D or E. The following information shall be available upon request: - description of measurement apparatus arrangement; - type and wavelengt
48、h of measurement source; - launch conditions; - details of computation technique; - date of latest calibration of equipment. See annexes A, B, C, D and E for any additional information that shall be available upon request. 9 Specification information The detail specification shall specify the follow
49、ing information: - type of fibre (or cable) to be measured; - failure or acceptance criteria; - information to be reported; - deviations to the procedure that apply. O BSI 6 June 2002 Page 9 EN 60793-1-222002 Annex A (norm at ive) Requirements specific to method A - Delay measuring A.l General Use this method to measure the length of optical fibre by itself, or installed in cable. If the specimen is a fibre in a cable, determine the value of group index N under conditions applicable to the specimen under measurement (for example, tension, temperature). This is done
