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 978-0-626-22960-3 SANS 60793-1-47:2009Edition 3IEC 60793-1-47:2009Edition 3SOUTH AFRICAN NATIONAL STANDARD Optical fibres Part 1-47: Measurement met
4、hods and test procedures Macrobending loss This national standard is the identical implementation of IEC 60793-1-47:2009 and is adopted with the permission of the International Electrotechnical Commission. WARNING Can only be used in conjunction with SANS 60793-1-1. Published by SABS Standards Divis
5、ion 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 60793-1-47:2009 Edition 3 IEC 60793-1-47:2009 Edition 3 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Comm
6、ittee SABS TC 79, Fibre optics, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in December 2009. This SANS document supersedes SANS 60793-1-47:2007 (edition 2). IEC 60793-1-47Edition 3.0 2009-03INTER
7、NATIONAL STANDARD Optical fibres Part 1-47: Measurement methods and test procedures Macrobending loss INTERNATIONAL ELECTROTECHNICAL COMMISSION PICS 33.180.10 PRICE CODEISBN 2-8318-1033-5 Registered trademark of the International Electrotechnical Commission SANS 60793-1-47:2009This s tandard may onl
8、y be used and printed by approved subscription and freemailing clients of the SABS . 2 60793-1-47 IEC:2009(E) CONTENTS FOREWORD.3 INTRODUCTION.5 1 Scope.6 2 Normative references .6 3 Specimen .7 3.1 Specimen length7 3.1.1 Method A Fibre winding 7 3.1.2 Method B Quarter circle bends .7 3.2 Specimen e
9、nd face7 4 Apparatus.7 4.1 Method A Fibre winding7 4.2 Method B Quarter circle bends .7 5 Procedure 8 5.1 Method A Fibre winding8 5.1.1 General .8 5.1.2 Single-mode fibres 9 5.1.3 Multimode (A1) fibres 10 5.2 Method B Quarter circle bends .10 6 Calculations .12 7 Results.12 7.1 Information available
10、 with each measurement .12 7.2 Information available upon request12 8 Specification information 13 Annex A (informative) Small bend radius phenomena 14 Bibliography16 Figure 1 Quarter circle guide groove in plate8 Figure 2 Multiple bends using stacked plates .11 Figure A.1 Loss curves versus curve f
11、its14 SANS 60793-1-47:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .60793-1-47 IEC:2009(E) 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ OPTICAL FIBRES Part 1-47: Measurement methods and test procedures Macrobending loss FOREWORD 1) The
12、 International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and
13、 electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical com
14、mittees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization f
15、or Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committe
16、e has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is ac
17、curate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regi
18、onal publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformi
19、ty with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any p
20、ersonal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative
21、references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible
22、 for identifying any or all such patent rights. International Standard IEC 60793-1-47 has been prepared by subcommittee 86A: Fibres and cables, of IEC technical committee 86: Fibre optics. This third edition cancels and replaces the second edition published in 2006. It constitutes a technical revisi
23、on. The main change is listed below: Introduction of the Annex A describing small bend radius phenomena. This standard is to be read in conjunction with IEC 60793-1-1. SANS 60793-1-47:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS . 4 607
24、93-1-47 IEC:2009(E) The text of this standard is based on the following documents: CDV Report on voting 86A/1207/CDV 86A/1240/RVC 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 publication has been drafted in a
25、ccordance with the ISO/IEC Directives, Part 2. A list of all parts of IEC 60793 series, published under the general title Optical fibres, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated
26、 on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. SANS 60793-1-47:2009This
27、 s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .60793-1-47 IEC:2009(E) 5 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 differen
28、t areas are grouped, but all numbers are possibly not used, 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 characteristics Parts 1-40 to 1-49: Measurement me
29、thods and test procedures for transmission and optical characteristics Parts 1-50 to 1-59: Measurement methods and test procedures for environmental characteristics SANS 60793-1-47:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS . 6 60793-
30、1-47 IEC:2009(E) OPTICAL FIBRES Part 1-47: Measurement methods and test procedures Macrobending loss 1 Scope This part of IEC 60793 establishes uniform requirements for measuring the macrobending loss of single-mode fibres (category B) at 1 550 nm or 1 625 nm, category A1 multimode fibres at 850 nm
31、or 1 300 nm, and category A3 and A4 multimode fibres at 650 nm, 850 nm or 1 300 nm, thereby assisting in the inspection of fibres and cables for commercial purposes. The standard gives two methods for measuring macrobending sensitivity: Method A Fibre winding, pertains to category B single-mode fibr
32、es and category A1 multimode fibres. Method B Quarter circle bends, pertains to category A3 and A4 multimode fibres. For both of these methods, the optical power is measured using either the power monitoring or the cut-back technique. Methods A and B are expected to produce different results if they
33、 are applied to the same fibre. This is because the key difference between the two methods is the deployment, including the bend radius and amount of fibre that is bent. The reason for the difference is that A3 and A4 multimode fibres are expected to be deployed in short lengths with relatively fewe
34、r bends compared to single-mode and category A1 multimode fibres. In the following text, the “curvature radius” is defined as the radius of the suitable circular shaped support (e.g. mandrel or guiding groove on a flat surface) on which the fibre can be bent. 2 Normative references The following ref
35、erenced 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 60793-1-1: Optical fibres Part 1-1: Measurement methods and te
36、st procedures General and guidance IEC 60793-1-40: Optical fibres Part 1-40: Measurement methods and test procedures Attenuation IEC 60793-1-46: Optical fibres Part 1-46: Measurement methods and test procedures Monitoring of changes in optical transmittance IEC 61280-4-1: Fibre-optic communication s
37、ubsystem test procedures Part 4-1: Cable plant and links Multimode fibre-optic cable plant attenuation measurement SANS 60793-1-47:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .60793-1-47 IEC:2009(E) 7 3 Specimen 3.1 Specimen length 3.1
38、1 Method A Fibre winding The specimen shall be a known length of fibre, as specified in the detail specification. In particular, the length of the sample tested for loss is determined by the measurement set-up, i.e. curvature radius (R) and number of turns (N); any further fibre length does not aff
39、ect the measurement results, provided that the signal to noise (S/N) ratio is optimised. 3.1.2 Method B Quarter circle bends The specimen length shall be determined according to the details shown in 5.2. 3.2 Specimen end face Prepare a flat end face, orthogonal to the fibre axis, at the input and ou
40、tput ends of each test specimen. 4 Apparatus 4.1 Method A Fibre winding The apparatus consists of a tool (e.g. a mandrel or a guiding groove on a flat surface) able to hold the sample bent with a radius as stated in the specification (e.g. 30 mm for single-mode fibres and 37,5 mm for multimode fibre
41、s) and a loss-measurement instrument. Determine the macrobending loss at the wavelength as stated in the specification (e.g. 850 nm or 1 300 nm for multimode fibres, 1 550 nm or 1 625 nm for singlemode fibre) by using either the transmitted power monitoring technique (method A of IEC 60793-1-46) or
42、the cut-back technique (method A of IEC 60793-1-40), taking care of the appropriate launch condition for the specific fibre type. 4.2 Method B Quarter circle bends The apparatus consists of one or more plates, each containing one or more “guide grooves,” and a loss-measurement instrument. The plates
43、 shall be designed to be stacked during the test without contacting the sample fibre in a lower or higher plate; such contact will affect the measurement results. Each guide groove shall have a quarter circle segment (i.e. 90) as shown in Figure 1. The bend radius r, i.e. the radius of the quarter c
44、ircle segment, shall be stated in the detail specification. The width of each guide groove shall be at least 0,4 mm greater than the diameter of the fibre. Determine the macrobending loss at the wavelength as stated in the specification (e.g. 650 nm, 850 nm, or 1 300 nm) by using either the transmit
45、ted power monitoring technique (method A of IEC 60793-1-46) or the cut-back technique (method A of IEC 60793-1-40), taking care of the appropriate launch condition for the specific fibre type. SANS 60793-1-47:2009This s tandard may only be used and printed by approved subscription and freemailing cl
46、ients of the SABS . 8 60793-1-47 IEC:2009(E) Guide groove Bend radius r IEC 1485/06Figure 1 Quarter circle guide groove in plate 5 Procedure 5.1 Method A Fibre winding 5.1.1 General Loosely wind the fibre on the tool, avoiding excessive fibre twist. The number of turns, curvature radius and waveleng
47、th at which loss is to be measured are discussed in the following paragraphs. Since the actual curvature radius is critical, a maximum tolerance of 0,1 mm (for radii lower than or equal to 15 mm) or 0,5 mm to 1,0 mm (for larger radii) is accepted: a tighter tolerance on small radii is required for h
48、igher measurement sensitivity. Both for single-mode and for multimode fibres, two optical powers can be measured using: the power-monitoring technique, which measures the fibre attenuation increase due to a change from the straight condition to a bent condition, or the cut-back technique, which meas
49、ures the total attenuation of the fibre in the bent condition. In order to determine the induced attenuation due to macrobending, this value should be corrected for the intrinsic attenuation of the fibre. The fibre length outside the mandrel and the reference cut-back length shall be free of bends that might introduce a significant change in the measurement result. Collection of excess fibre in a bend radius of at least 140 mm is recommend
