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1、BRITISH STANDARD BS EN 188201:1996 Harmonized system of quality assessment for electronic components Family specification: A1a graded index multimode optical fibres The European Standard EN 188201:1995 has the status of a British Standard Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:34:
2、46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 188201:1996 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 March 1996 BSI 04-2000 The following BSI referenc
3、es relate to the work on this standard: Committee reference EPL/86/1 Draft announced in BSI News December 1995 ISBN 0 580 25254 X Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee EPL/86, Fibre optics, to Subcommittee EPL/8
4、6/1, Optical fibres and cables, upon which the following bodies were represented: British Approvals Service for Cables British Cable Makers Confederation British Telecommunications plc Department of Trade and Industry (National Physical Laboratory) Federation of the Electronics Industry Ministry of
5、Defence National Supervising Inspectorate (BSI PC) Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:34:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 188201:1996 BSI 04-2000i Contents Page Committees responsibleInside front cover
6、 National forewordii Foreword2 1Introduction3 2Dimensions3 3Optical parameters3 Figure 1 Possible relation between the bandwidth at 850 nm and at 1 300 nm for A1a multimode fibres3 Table I Coating dimensions3 Table II Glass dimensions3 Table III Optical parameters3 List of referencesInside back cove
7、r Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:34:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 188201:1996 ii BSI 04-2000 National foreword This British Standard has been prepared by Subcommittee EPL/86/1 and is the English language version of EN 188201:1995 Family specification:
8、 A1a graded index multimode optical fibres, published by the European Committee for Electrotechnical Standardization (CENELEC). A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Complia
9、nce with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred toCorresponding British Standard EN 188000Harmonized system of quality assessment for electronic components BS EN 188000:1994 Generic specification for optical fibres EN 18820
10、0BS EN 188200:1996 Sectional specification: Optical fibres A1 category graded multimode Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 4, an inside back cover and a back cover. This standard has been updated (see copyright
11、 date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:34:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 188201 September 1
12、995 ICS 33.180.10 Descriptors: Quality, electronic components, optical fibres English version Family specification: A1a graded index multimode optical fibres (nexiste pas encore en franc1is)Familienspezifikation: Mehrmoden-Lichtwellenleiter Kategorie A1a This European Standard was approved by CENELE
13、C on 1995-07-04. CENELEC members are bound to comply with 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
14、 may be obtained on application to the Central Secretariat 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
15、 to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and Un
16、ited Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1995 Copyright reserved to CENELEC members Ref. No. EN 188201:1995 E
17、 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:34:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 188201:1995 BSI 04-2000 2 Foreword This European Standard was prepared by Working Group CLC/TC CECC/WG 28. The text of the draft was submitted to the Unique Acceptance Procedure and was app
18、roved by CENELEC as EN 188201 on 1995-07-04. This standard completes the Sectional specification published as EN 188200. 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) 1996-07
19、-15 latest date by which the national standards conflicting with the EN have to be withdrawn(dow) 1997-07-15 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:34:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 188201:1995 BSI 04-20003 1 Introduction Definitions and test methods are given in
20、 EN 188000, Generic Specification: Optical Fibres, and in EN 188200, Sectional Specification:A1 category graded index multimode fibres. 2 Dimensions The dimensions of A1a (50/125 m) graded index multimode fibres are given in Table I and Table II. Table I Coating dimensions Table II Glass dimensions
21、3 Optical parameters The optical parameters of A1a (50/125 m) graded index multimode fibres (attenuation, modal bandwidth and numerical aperture) are given in Table III. Ranges of possible attenuation and bandwidth values are suggested at both 850 nm and 1 300 nm. The actual values at both wavelengt
22、hs (or just at one of these wavelengths) are to be agreed between user and manufacturer. NOTEMultimode fibres can in general be optimized in bandwidth either for 850 nm or 1 300 nm or between these wavelengths, depending on the refractive index profile parameter, g (see clause 1.4.1 in EN 188000), s
23、ee Figure 1. Due to this optimization it is practically impossible to produce fibres at extreme high bandwidths at both 850 nm and 1 300 nm, like 800 MHz.km at 850 nm and also 1 500 MHz.km at 1 300 nm. Table III Optical parameters ParameterValuesUnits Primary coating diameter245 10m Primary coating
24、non-circularityk 6% Cladding/primary coating concentricity errork 12,5m ParameterValuesUnits Core diameter50 3m Core non-circularityk 6% Core/cladding concentricity errork 3m Cladding diameter125 2m Cladding non-circularityk 2% ParameterValuesValuesUnits Wavelength8501 300nm Attenuation (maximum)2,4
25、 to 2,70,6 to 1,0dB/km Modal bandwidth (minimum)200 to 800400 to 1 500 MHz.km Numerical aperture0,20 0,02 Figure 1 Possible relation between the bandwidth at 850 nm and at 1 300 nm for A1a multimode fibres. The indicated regions correspond to bandwidth optimization at either 850 nm (region X), or at
26、 1 300 nm (region Z) or between these wavelengths (region Y). Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:34:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 blank Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:34:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 188201:199
27、6 BSI 04-2000 List of references See national foreword. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:34:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 188201:1996 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body respons
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36、e to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel: 020 8996 7070. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 17 08:34:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI