1、 IEC 60793-1-44 Edition 2.0 2011-04 INTERNATIONAL STANDARD NORME INTERNATIONALE Optical fibres Part 1-44: Measurement methods and test procedures Cut-off wavelength Fibres optiques Partie 1-44: Mthodes de mesure et procdures dessai Longueur donde de coupure IEC 60793-1-44:2011 THIS PUBLICATION IS CO
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16、 Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 60793-1-44 Edition 2.0 2011-04 INTERNATIONAL STANDARD NORME INTERNATIONALE Optical fibres Part 1-44: Measurement methods and test procedures Cut-off wavelength Fibres optiques Partie 1-44: Mthodes de mesure et procdures dessai Longueu
17、r donde de coupure INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE S ICS 33.180.10 PRICE CODE CODE PRIX ISBN 978-2-88912-747-4 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale 2 60
18、793-1-44 IEC:2011 CONTENTS FOREWORD . 4 1 Scope . 6 2 Normative references . 6 3 Background 6 4 Overview of methods 7 5 Mapping functions 7 6 Reference test method . 8 7 Apparatus . 8 7.1 Light source 8 7.2 Modulation 8 7.3 Launch optics 8 7.4 Support and positioning apparatus 8 7.5 Cladding mode st
19、ripper . 8 7.6 Deployment mandrel . 9 7.6.1 General . 9 7.6.2 Cable cut-off wavelength, Method A 9 7.6.3 Cable cut-off wavelength, Method B 9 7.6.4 Fibre cut-off wavelength, Method C . 9 7.7 Detection optics 11 7.8 Detector assembly and signal detection electronics . 11 8 Sampling and specimens 11 8
20、.1 Specimen length 11 8.2 Specimen end face 12 9 Procedure 12 9.1 Positioning of specimen in apparatus 12 9.1.1 General requirements for all methods 12 9.1.2 Deployment requirements for each method 12 9.2 Measurement of output power . 12 9.2.1 Overview . 12 9.2.2 Bend-reference technique 13 9.2.3 Mu
21、ltimode-reference technique 13 10 Calculations . 13 10.1 Bend-reference technique . 13 10.2 Multimode-reference technique . 14 10.3 Curve-fitting technique for improved precision (optional) . 14 10.3.1 General . 14 10.3.2 Step 1, define the upper-wavelength region . 15 10.3.3 Step 2, characterize th
22、e attenuation curve . 15 10.3.4 Step 3, determine the upper wavelength of the transition region 16 10.3.5 Step 4, determine the lower wavelength of the transition region . 16 10.3.6 Step 5, characterize the transition region with the theoretical model 16 10.3.7 Step 6, compute the cut-off wavelength
23、, c. 17 11 Results . 17 11.1 Report the following information with each measurement: . 17 11.2 The following information shall be available upon request: 17 60793-1-44 IEC:2011 3 12 Specification information 18 Annex A (normative) Requirements specific to method A Cable cut-off wavelength, cc , usin
24、g uncabled fibre . 19 Annex B (normative) Requirements specific to method B Cable cut-off wavelength, cc , using cabled fibre . 20 Annex C (normative) Requirements specific to method C Fibre cut-off wavelength, c. 21 Bibliography 22 Figure 1 Deployment configuration for cable cut-off wavelength, met
25、hod A 9 Figure 2 Deployment configuration for cable cut-off wavelength, method B 10 Figure 3 Default configuration to measure c. 10 Figure 4 Deployment configurations for fibre cut-off measurement . 11 Figure 5 Cut-off wavelength using the bend-reference technique . 12 Figure 6 Cut-off wavelength us
26、ing the multimode-reference technique . 13 4 60793-1-44 IEC:2011 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ OPTICAL FIBRES Part 1-44: Measurement methods and test procedures Cut-off wavelength FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardiz
27、ation 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 electronic fields. To this end and in addition to other activities, IEC publishes Internat
28、ional Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in
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34、rried out by independent certification bodies. 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 C
35、ommittees for any personal 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 draw
36、n to the Normative 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
37、be held responsible for identifying any or all such patent rights. International Standard IEC 60793-1-44 has been prepared by subcommittee 86A: Fibres and cables, of IEC technical committee 86: Fibre optics. This second edition cancels and replaces the first edition published in 2001. This edition c
38、onstitutes a technical revision. The main change with respect to the previous edition is the withdrawal of Annex D. Annexes A, B and C form an integral part of this standard. This standard should be read in conjunction with IEC 60793-1-1. 60793-1-44 IEC:2011 5 This bilingual edition corresponds to t
39、he monolingual English version, published in 2011-04. The text of this standard is based on the following documents: FDIS Report on voting 86A/1369/FDIS 86A/1385/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. Th
40、e French version of this standard has not been voted upon. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of the IEC 60793-1-4x series, published under the general title Optical fibres Measurement methods and test procedures, can be found on
41、the IEC website The committee has decided that the contents of this publication will remain unchanged until the stability date indicated 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, re
42、placed by a revised edition, or amended. 6 60793-1-44 IEC:2011 OPTICAL FIBRES Part 1-44: Measurement methods and test procedures Cut-off wavelength 1 Scope This part of IEC 60793 establishes uniform requirements for measuring the cut-off wavelength of single-mode optical fibre, thereby assisting in
43、the inspection of fibres and cables for commercial purposes. This standard gives the methods for measuring the cut-off wavelength of fibre and cable There are two methods for measuring cable cut-off wavelength, cc : Method A: using uncabled fibre; Method B: using cabled fibre. There is only one meth
44、od (Method C) for measuring fibre cut-off wavelength, c . The test method in this standard describes procedures for determining the cut-off wavelength of a sample fibre in either an uncabled condition ( c ) or in a cable ( cc ). Three default configurations are given here: any different configuratio
45、n will be given in a detail specification. These procedures apply to all category B and C fibre types (see Normative references). All methods require a reference measurement. There are two reference-scan techniques, either or both of which may be used with all methods: bend-reference technique; mult
46、imode-reference technique using category A1 multimode fibre. 2 Normative references 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 (
47、including any amendments) applies. IEC 60793-1-1, Optical fibres Part 1-1: Measurement methods and test procedures General and guidance IEC 60793-1-40, Optical fibres Part 1-40: Measurement methods and test procedures Attenuation 3 Background Theoretical cut-off wavelength is the shortest wavelength
48、 at which only the fundamental mode can propagate in a single-mode fibre, as computed from the refractive index profile of the fibre. In optical fibres, the change from multimode to single-mode behaviour does not occur at an isolated wavelength, but rather smoothly over a range of wavelengths. For p
49、urposes of 60793-1-44 IEC:2011 7 determining fibre performance in a telecommunications network, theoretical cut-off wavelength is less useful than the lower value actually measured when the fibre is deployed. Measured cut-off wavelength is defined as the wavelength greater than which the ratio between the total power, including launched higher-order modes, and the fu
