1、 TIA-455-133-A-2003 APPROVED: MAY 21, 2003 REAFFIRMED: FEBRUARY 6, 2013 TIA-455-133-A (Revision of TIA-455-133) May 2003FOTP- 133 IEC-60793-1-22 Optical Fibres- Part 1-22: Measurement Methods and Test Procedures- Length Measurement NOTICE TIA Engineering Standards and Publications are designed to se
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19、S A FUNDAMENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. 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
20、-A supercedes the current 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 Optica
21、l Fibers. 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 3.6
22、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 (normativ
23、e) 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 reflecte
24、d 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 meas
25、urement.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 t
26、race 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 i60793-1-22 IEC:2001 TIA-455-133-A Figure B.4 Schematic trace of a specimen (0 to z2) with no section precedi
27、ng 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) 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-
28、up for differential pulse-delay technique (C.2.2.2) 19 Figure E.1 Apparatus for fibre length measurement 27 Table 1 Measurement methods2 ii60793-1-22 IEC:2001 TIA-455-133-A INTERNATIONAL ELECTROTECHNICAL COMMISSION _ OPTICAL FIBRES Part 1-22: Measurement methods and test procedures Length measuremen
29、t 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 concerning standardization
30、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 this preparatory work. Inter
31、national, 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 two organizations. 2) The
32、 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 produced have the form of recomme
33、ndations 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 undertake to apply IEC Internatio
34、nal 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 procedure to indicate its approval
35、 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 responsible for identifying a
36、ny 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 first edition of IEC 6079
37、3-1-2, 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 in the above table. This
38、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. iii60793-1-22 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 method
39、s and test procedures Fibre geometry Part 1-21: Measurement methods and test procedures Coating geometry Part 1-22: 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 publicati
40、on will be reconfirmed; withdrawn; replaced by a revised edition, or amended. iv60793-1-22 IEC:2001 TIA-455-133-A INTRODUCTION Publications in the IEC 60793-1 series concern measurement methods and test procedures as they apply to optical fibres. Within the same series several different areas are gr
41、ouped, 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 optic
42、al characteristics parts 1-50 to 1-59: Measurement methods and test procedures for environmental characteristics. v60793-1-22 IEC:2001 TIA-455-133-A vi60793-1-22 IEC:2001 TIA-455-133-A OPTICAL FIBRES Part 1-22: Measurement methods and test procedures Length measurement 1 Scope This part of IEC 60793
43、 establishes uniform requirements for measuring the length and elongation 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 r
44、eferences The following referenced documents are indispensable for the 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, Optical fibres Part 1-4
45、0: Measurement methods and test procedures Attenuation IEC 60793-1-42, Optical fibres Part 1-42: Measurement methods and test procedures Chromatic dispersion IEC 60794-1-1, Optical fibre cables Part 1-1: Generic specification General 160793-1-22 IEC:2001 TIA-455-133-A 3 Overview of method This stand
46、ard gives five methods for measuring length, which are presented in the following table 1. Table 1 Measurement methods Method Characteristics covered Fibre category(ies) covered Former designation A Delay measuring Length All A1 and all B IEC 60793-1-A6 B Backscattering Length All A1 and all B IEC 6
47、0793-1-C1C C Fibre elongationaFibre elongation A1 and B1 bIEC 60793-1-A7 D Mechanical Length All IEC 60793-1-A5 E Phase shift Length All A1 and all B IEC 60793-1-A8 aThe measurement of fibre elongation, method C, is part of several measurement methods for fibres and fibre optic cables, such as those
48、 in IEC 60794-1-1. bThis measurement is applicable unreservedly to type B single-mode fibres. For type A1 multimode fibres, take particular care when interpreting the results because the results of this measurement may be influenced by interfering modal effects, for example, due to the occurrence of
49、 non-longitudinal stresses on the fibre. Application of the measurement to A2 to A4 multimode fibres is under consideration. Information common to all measurements is contained in clauses 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 Method A Delay measuring The delay measuring method applies to measurements of the fibre length by the measurement of the propagation tim
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