1、 TIA STANDARD ANSI/TIA-455-80-C-2003 Approved: May 21, 2003 FOTP-80 IEC-60793-1-44 Optical Fibres Part 1-44: Measurement Methods and Test Procedures Cut-off Wavelength TIA-455-80-C (Revision of TIA/EIA-455-80-B) MAY 2003 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Representing the telecommunications ind
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23、S.A. and Canada 1-800-854-7179, International (303) 397-7956 FOREWARD With the adoption of international standard IEC 60793-1-44 (Optical Fibres Part 1-44: Measurement Methods and Test Procedures Cut-off Wavelength) TIA-455-80-C supercedes the current TIA-455-80-B (FOTP-80 Measurement of Cut-off Wav
24、elength of Single-Mode Fiber by Transmitted Power). This action was taken under the cognizance of the TIA FO-4.6 Subcommittee on Optical Fibers. 60793-1-44 IEC:2001 TIA-455-80-C CONTENTS 1 Scope 1 2 Normative references.1 3 Background .1 4 Overview of methods2 5 Mapping functions3 6 Reference test m
25、ethod .3 7 Apparatus 3 8 Sampling and specimens .7 9 Procedure7 10 Calculations.9 11 Results 13 12 Specification information 14 Figure 1 Deployment configuration for cable cut-off Method A .5 Figure 2 Deployment configuration for cable cut-off Method B .5 Figure 3 Default configuration to measure cj
26、.6 Figure 4a Initial deployment configuration for fibre cut-off measurement Circular mandrel .6 Figure 4b Alternative deployment configuration for fibre cut-off measurement Split mandrel .7 Figure 4 Deployment configurations for fibre cut-off measurement .7 Figure 5 Cut-off wavelength using the bend
27、 reference technique8 Figure 6 Cut-off wavelength using the multimode reference technique9 i60793-1-44 IEC:2001 TIA-455-80-C INTERNATIONAL ELECTROTECHNICAL COMMISSION _ OPTICAL FIBRES Part 1-44: Measurement methods and test procedures Cut-off wavelength FOREWORD 1) The IEC (International Electrotech
28、nical 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 in the electrical and electronic fields. To this
29、 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. International, governmental and non-governmental orga
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34、pment declared to be in conformity with one of its standards. 6) 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 any or all such patent rights. International Stan
35、dard IEC 60793-1-44 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 60793-1-4X series, replaces the second edition of IEC 60793-1-4, of which it constitutes a technical revision. The te
36、xt of this standard is based on the following documents: FDIS Report on voting 86A/673/FDIS 86A/697/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 publication has been drafted in accordance with the ISO/IEC
37、 Directives, Part 3. Annexes A, B, C and D form an integral part of this standard. IEC 60793-1-1 and IEC 60793-1-2 cover generic specifications. ii60793-1-44 IEC:2001 TIA-455-80-C IEC 60793-1-4X consists of the following parts, under the general title: Optical fibres: Part 1-40: Measurement methods
38、and test procedures Attenuation Part 1-41: Measurement methods and test procedures Bandwidth Part 1-42: Measurement methods and test procedures Chromatic dispersion Part 1-43: Measurement methods and test procedures Numerical aperture Part 1-44: Measurement methods and test procedures Cut-off wavele
39、ngth Part 1-45: Measurement methods and test procedures Mode field diameter Part 1-46: Measurement methods and test procedures Monitoring of changes in optical transmittance Part 1-47: Measurement methods and test procedures Macrobending loss Part 1-48: Measurement methods and test procedures Under
40、consideration Part 1-49: Measurement methods and test procedures Under consideration 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. iii60793-1-4
41、4 IEC:2001 TIA-455-80-C 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 grouped, as follows: parts 1-10 to 1-19: General parts 1-20 to 1-29: Measurement methods and
42、 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 optical characteristics parts 1-50 to 1-59: Measurement methods and test procedures for environ
43、mental charac-teristics. iv60793-1-44 IEC:2001 TIA-455-80-C 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 the
44、 inspection of fibres and cables for commercial purposes. This standard provides methods for measuring the cut-off wavelength of cable, fibre, and jumper cable. Two methods exist for measuring cable cut-off wavelength, cc: method A: using uncabled fibre; method B: using cabled fibre. There is only o
45、ne method for measuring fibre cut-off wavelength, c. There is only one method for measuring jumper cable fibre cut-off wavelength, cj. 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)
46、 or as a jumper cable (cj). Three default configurations are given here: any different configuration will be given in a detail specification. This method applies to all B fibre types. All methods require a reference measurement. There are two reference-scan techniques, either or both of which may be
47、 used with all methods: bend-reference technique; multimode-reference technique. 2 Normative references None. 3 Background Theoretical cut-off wavelength is the shortest wavelength at which only the fundamental mode can propagate in a single-mode fibre, as computed from the refractive index profile
48、of the fibre. In optical fibres, the change from multimode to single-mode behaviour does not occur at an isolated wavelength, but rather it occurs smoothly over a range of wavelengths. For purposes of determining fibre performance in a telecommunications network, theoretical cut-off wave- length is
49、less useful than the lower value actually measured when the fibre is deployed. 160793-1-44 IEC:2001 TIA-455-80-C 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 fundamental mode power has decreased to less than 0,1 dB. According to this definition, the second-order (LP11) mode undergoes 19,3 dB more attenuation than the fundamental (LP
