1、BRITISH STANDARD BS EN 60793-1-45: 2003 Optical fibres Part 1-45: Measurement methods and test procedures Mode field diameter The European Standard EN 60793-1-45:2003 has the status of a British Standard ICS 33.180.10 BS EN 60793-1-45:2003 This British Standard was published under the authority of t
2、he Standards Policy and Strategy Committee on 26 April 2004 BSI 26 April 2004 ISBN 0 580 43351 X National foreword This British Standard is the official English language version of EN 60793-1-45:2003. It was derived by CENELEC from IEC 60793-1-45:2001. It partly supersedes BS EN 188000:1994 which wi
3、ll be withdrawn on publication of the full BS EN 60793-1 series. The CENELEC common modifications have been implemented at the appropriate places in the text and are indicated by common modification tags . The UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre opt
4、ics, to Subcommittee GEL/86/1, Optical fibres and cables, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to i
5、n this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of
6、a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or propo
7、sals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 30, an inside back cover and a back cover. The BSI
8、copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 60793-1-45 NORME EUROPENNE EUROPISCHE NORM December 2003 CENELEC European Committee for Electrotechnical Standardization Comit Europ
9、en de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60793-1-45:2003 E ICS 33.180.10
10、Partly supersedes EN 188000:1992 Incorporates Corrigendum April 2004English version Optical fibres Part 1-45: Measurement methods and test procedures Mode field diameter (IEC 60793-1-45:2001 + corrigendum 2002, modified) Fibres optiques Partie 1-45: Mthodes de mesure et procdures dessai Diamtre du c
11、hamp de mode (CEI 60793-1-45:2001 + corrigendum 2002, modifie) Lichtwellenleiter Teil 1-45: Messmethoden und Prfverfahren Modenfelddurchmesser (IEC 60793-1-45:2001 + Corrigendum 2002, modifiziert) This European Standard was approved by CENELEC on 2003-11-01. CENELEC members are bound to comply with
12、the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat
13、 or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the off
14、icial versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Lithuania, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United
15、Kingdom. Foreword The text of document 86A/674/FDIS, future edition 1 of IEC 60793-1-45, prepared by SC 86A, Fibres and cables, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60793-1-45 on 2001-10-01. A draft amendment, prepared by the Te
16、chnical Committee CENELEC CENELEC TC 86A, Optical fibres and optical fibre cables, was submitted to the Unique Acceptance Procedure and was approved by CENELEC for inclusion into EN 60793-1-45 on 2003-11-01. This European Standard supersedes subclause 4.24 (test method 314) and subclause 4.25 (test
17、method 315) of EN 188000:1992. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2004-11-01 latest date by which the national standards conflicting with the EN have to be withdr
18、awn (dow) 2006-11-01 Annexes designated “normative“ are part of the body of the standard. In this standard, Annexes A, B, C, D and ZA are normative and annex E is informative. Annex ZA has been added by CENELEC. Compared to IEC 60793-1:1989 and IEC 60793-2:1992, IEC/SC 86A has adopted a revised stru
19、cture of the new IEC 60793 series: The individual measurement methods and test procedures for optical fibres are published as “Part 1-XX“; the product standards are published as “Part 2-XX“. The general relationship between the new series of EN 60793 and the superseded European Standards of the EN 1
20、88000 series is as follows: EN Title supersedes EN 60793-1-XX Optical fibres - Part 1-XX: Measurement methods and test procedures Individual subclauses of EN 188000:1992 EN 60793-2-XX Optical fibres - Part 2-XX: Product specifications EN 188100:1995 EN 188101:1995 EN 188102:1995 EN 188200:1995 EN 18
21、8201:1995 EN 188202:1995 EN 60793-1-4X consists of the following parts, under the general title: Optical fibres: - Part 1-40: Measurement methods and test procedures Attenuation - Part 1-41: Measurement methods and test procedures Bandwidth - Part 1-42: Measurement methods and test procedures Chroma
22、tic dispersion - Part 1-43: Measurement methods and test procedures Numerical aperture - Part 1-44: Measurement methods and test procedures Cut-off wavelength - Part 1-45: Measurement methods and test procedures Mode field diameter - Part 1-46: Measurement methods and test procedures Monitoring of c
23、hanges in optical transmittance - Part 1-47: Measurement methods and test procedures Macrobending loss - Part 1-48: Measurement methods and test procedures Polarization mode dispersion - Part 1-49: Measurement methods and test procedures Differential mode delay The contents of the corrigendum of Apr
24、il 2004 have been included in this copy. _ - - 3 6 NE970-3-1:540023 Endorsement notice The text of the International Standard IEC 60793-1-45:2001 was approved by CENELEC as a European Standard with agreed common modifications. DOM NOMMOCITACIFINOS nAnex D calpeRe ht3 e drraparghpa by: Teh msaeruemc
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29、 .D.3D ot 3.4.3: Page2 EN60793145:2003 CONTENTS INTRODUCTION.5 1 Scope6 2 Normative references .7 3 Reference test method .7 4 Apparatus7 4.1 Light source.7 4.2 Input optics7 4.3 Input positioner8 4.4 Cladding mode stripper8 4.5 High-order mode filter8 4.6 Output positioner .8 4.7 Output optics .8 4
30、.8 Detector8 4.9 Computer8 5 Sampling and specimens8 5.1 Specimen length8 5.2 Specimen end face9 6 Procedure9 7 Calculations .9 7.1 Method A Direct far-field scan.9 7.2 Method B Variable aperture in the far field.10 7.3 Method C Near-field scan .11 8 Results11 8.1 Information to be provided with eac
31、h measurement11 8.2 Information available upon request 11 9 Specification information 12 Annex A (normative) Requirements specific to method A Mode field diameter by direct far-field scan .13 Annex B (normative) Requirements specific to method B Mode field diameter by variable aperture in the far fi
32、eld16 Annex C (normative) Requirements specific to method C Mode field diameter by near-field scan 19 Annex D (normative) Requirements specific to method D Mode field diameter by optical time domain reflectometer (OTDR).23 Annex E (informative) Sample data sets and calculated values .28 Annex ZA (no
33、rmative) Normative references to international publications with their corresponding European publications.30 Page3 EN60793145:2003 Figure 1 Transform relationships between measurement results .6 Figure A.1 Far-field measurement set.13 Figure B.1 Variable aperture by far-field measurement set16 Figu
34、re C.1 Near-field measurement set-ups20 Figure D.1 Optical switch arrangement .24 Figure D.2 View from reference fibre A.25 Figure D.3 View from reference fibre B.25 Figure D.4 Validation example Comparison of methods27 Table E.1 Sample data, method A MFD by direct far-field scan 28 Table E.2 Sample
35、 data set, method B MFD by variable aperture in the far field 29 Table E.3 Sample data set, method C MFD by near-field scan .29 Page4 EN60793145:2003 INTRODUCTION Publications in the IEC 60793-1 series concern measurement methods and test procedures as they apply to optical fibres. Within the same s
36、eries several different areas are grouped, 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
37、procedures for transmission and optical characteristics parts 1-50 to 1-59: Measurement methods and test procedures for environmental charac- teristics. Page5 EN60793145:2003 OPTICAL FIBRES Part 1-45: Measurement methods and test procedures Mode field diameter 1 Scope This part of IEC 60793 establis
38、hes uniform requirements for measuring the mode field diameter (MFD) of optical fibre, thereby assisting in the inspection of fibres and cables for commercial purposes. The MFD represents a measure of the transverse extent of the electromagnetic field intensity of the mode in a fibre cross section,
39、and it is defined from the far-field intensity distribution as a ratio of integrals known as the Petermann II definition. See equation (1). The definitions of MFD are strictly related to the measurement configurations. The mathematical equivalence of these definitions results from transform relation
40、ships between measurement results obtained by different implementations summarized in figure 1 as follows: Far-field scan Variable aperture technique Hankel transform Integration Near field scanFigure 1 Transform relationships between measurement results Four methods are described for measuring MFD:
41、 method A: direct far-field scan; method B: variable aperture in the far field; method C: near-field scan; method D: bi-directional backscatter using an optical time domain reflectometer (OTDR). All four methods apply to all categories of type B single-mode fibre shown in IEC 60793-2 and operating n
42、ear 1 310 nm or 1 550 nm. Method D is not recommended for the measurement of fibres of unknown type or design. Information common to all four methods is contained in clauses 1 to 8, and information pertaining to each individual method appears in annexes A, B, C and D, respectively. IEC 706/01 Page6
43、EN60793145:2003 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 60793. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, partie
44、s to agreements based on this part of IEC 60793 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IEC and ISO maintain reg
45、isters of currently valid International Standards. IEC 60793-1-40, Optical fibres Part 1-40: Measurement methods and test procedures Attenuation IEC 60793-2:1998, Optical fibres Part 2: Product specifications 3 Reference test method Method A, direct far-field scan, is the reference test method (RTM)
46、, which shall be the one used to settle disputes. 4 Apparatus The following apparatus is common to all measurement methods. Annexes A, B, C and D include layout drawings and other equipment requirements for each of the four methods, respectively. 4.1 Light source For methods A, B and C, use a suitab
47、le coherent or non-coherent light source such as a semiconductor laser or a sufficiently powerful filtered white light source. The source shall produce sufficient radiation at the intended wavelength(s) and be stable in intensity over a time period sufficient to perform the measurement. A monochroma
48、tor or interference filter(s) may be used, if required, for wavelength selection. The detail specification shall specify the wavelength of the source. The FWHM (full width half maximum) spectral line width of the source shall be less than or equal to 10 nm, unless otherwise specified. See annex D fo
49、r method D. 4.2 Input optics For method A, B, and C, an optical lens system or fibre pigtail may be employed to excite the specimen. It is recommended that the power coupled into the specimen be relatively insensitive to the position of its input end face. This can be accomplished by using a launch beam that spatially and angularly ove
