1、 TIA STANDARD ANSI/TIA-455-133-A-2003 Approved: May 21, 2003 FOTP-133 IEC-60793-1-22 Optical Fibres Part 1-22: Measurement Methods and Test Procedures Length Measurement TIA-455-133-A (Revision of TIA/EIA-455-133) MAY 2003 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Representing the telecommunications i
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25、by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-FOREWORD With the adoption of international standard IEC 60793-1-22 (Optical Fibres Part 1-22: Measurement Methods and Test Procedures Length Measurement) TIA-455-133-A supercedes the curr
26、ent TIA/EIA-455-133 (FOTP133 Length Measurement of an Optical Fiber or Cable by the Phase-Shift Method), and replaces TIA/EIA-455-60-A (FOTP60 Measurement of Fiber or Cable Length Using an OTDR) This action was taken under the cognizance of the TIA FO-4.6 Subcommittee on Optical Fibers. Copyright El
27、ectronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license f
28、rom IHS-,-,-60793-1-22 IEC:2001 TIA-455-133-A CONTENTS FOREWORD . iii INTRODUCTION v 1 Scope 1 2 Normative references.1 3 Overview of method .2 3.1 Method A Delay measuring.2 3.2 Method B Backscattering2 3.3 Method C Fibre elongation .2 3.4 Method D Mechanical length 3 3.5 Method E Phase shift .3 3.
29、6 Reference test method 3 4 Apparatus 3 5 Sampling and specimens .3 6 Procedure3 7 Calculations.3 8 Results 3 9 Specification information 4 Annex A (normative) Requirements specific to method A Delay measuring5 Annex B (normative) Requirements specific to method B Backscattering . 10 Annex C (normat
30、ive) Requirements specific to method C Fibre elongation 17 Annex D (normative) Requirements specific to method D Mechanical length 21 Annex E (normative) Requirements specific to method E Phase shift. 22 Figure A.1 Time measurement of the transmitted pulse 6 Figure A.2 Time measurement of the reflec
31、ted pulse6 Figure A.3a Channel 1: emitted pulse .8 Figure A.3b Channel 2: transmitted pulse.8 Figure A.3c Emitted pulse after adjustment of the repetition rate in such a way that the second pulse of channel 1 coincides with the transmitted pulse of channel 2 8 Figure A.3 Principle of fibre-length me
32、asurement.8 Figure B.1 Block diagram of an OTDR . 10 Figure B.2 Schematic OTDR trace of a specimen (z1to z0) with a section (e.g. dead-zone fibre) of unknown length, z1, preceding it and without a reflection pulse from the fibre joint point (two-point technique (B.4.3.1) 14 Figure B.3 Schematic OTDR
33、 trace of specimen (z1to 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). 15 iCopyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproducti
34、on or networking permitted without license from IHS-,-,-60793-1-22 IEC:2001 TIA-455-133-A Figure B.4 Schematic trace of a specimen (0 to z2) with no section preceding it (single-point technique (B.4.3.2) 15 Figure B.5 Schematic OTDR trace of a specimen (zDto z2) with a section (e.g. dead-zone fibre)
35、 of known length, zD, preceding it (single-point technique (B.4.3.3) 16 Figure C.1 Equipment set-up for phase-shift technique (C.2.2.1) 18 Figure C.2 Equipment set-up for differential pulse-delay technique (C.2.2.2) 19 Figure E.1 Apparatus for fibre length measurement 27 Table 1 Measurement methods2
36、 iiCopyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-60793-1-22 IEC:2001 TIA-455-133-A INTERNATIONAL ELECTROTECHNICAL COMMISSION _ OPTICAL FIBRES Part 1-22: Measurement methods and test pr
37、ocedures Length measurement FOREWORD 1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote international co-operation on all questions c
38、oncerning standardization in the electrical and electronic fields. To this end and in addition to other activities, the IEC publishes International Standards. Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in th
39、is preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
40、 two organizations. 2) The formal decisions or agreements of the 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 interested National Committees. 3) The documents produce
41、d have the form of recommendations for international use and are published in the form of standards, technical specifications, technical reports or guides and they are accepted by the National Committees in that sense. 4) In order to promote international unification, IEC National Committees underta
42、ke to apply IEC International Standards transparently to the maximum extent possible in their national and regional standards. Any divergence between the IEC Standard and the corresponding national or regional standard shall be clearly indicated in the latter. 4) The IEC provides no marking procedur
43、e to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with one of its standards. 5) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. The IEC shall not be held res
44、ponsible for identifying any or all such patent rights. International Standard IEC 60793-1-22 has been prepared by subcommittee 86A: Fibres and cables, of IEC technical committee 86: Fibre optics. This standard, together with the other standards in the IEC 60793-1-2X series, cancels and replaces the
45、 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: FDIS Report on voting 86A/687/FDIS 86A/726/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated
46、 in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. Annexes A, B, C, D and E form an integral part of this standard. iiiCopyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking per
47、mitted without license from IHS-,-,-60793-1-22 IEC:2001 TIA-455-133-A 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-
48、22: Measurement methods and test procedures Length measurement The committee has decided that the contents of this publication will remain unchanged until 2003. At this date, the publication will be reconfirmed; withdrawn; replaced by a revised edition, or amended. ivCopyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-60793-1-22 IEC:2001 TIA-455-133-A INTRODUCTION Publications in the IEC 60793-1 series concern measurement methods and test procedures as they apply to opt
