IEC 60793-2-2007（光纤分类）

IEC 60793-2 Edition 6.0 2007-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Optical fibres – Part 2: Product specifications – General Fibres optiques – Partie 2: Spécifications de produits – Généralités IE C 6 07 93 -2 :2 00 7 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright © 2007 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or your local IEC member National Committee for further information. Droits de reproduction réservés. 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Egalement appelé Vocabulaire Electrotechnique International en ligne. ƒ Service Clients: www.iec.ch/webstore/custserv/custserv_entry-f.htm Si vous désirez nous donner des commentaires sur cette publication ou si vous avez des questions, visitez le FAQ du Service clients ou contactez-nous: Email: csc@iec.ch Tél.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 60793-2 Edition 6.0 2007-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Optical fibres – Part 2: Product specifications – General Fibres optiques – Partie 2: Spécifications de produits – Généralités INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE J ICS 33.180.10 PRICE CODE CODE PRIX ISBN 2-8318-9366-6 – – 60793-2 © IEC:2007 2 CONTENTS FOREWORD...........................................................................................................................3 1 Scope...............................................................................................................................5 2 Normative references .......................................................................................................5 3 Terms and definitions .......................................................................................................6 4 Quality assurance.............................................................................................................7 5 Construction of optical fibres ............................................................................................7 5.1 Category A – Multimode fibres.................................................................................7 5.2 Category B – Single-mode fibres .............................................................................7 5.3 Category C – Single-mode fibres for intraconnection ...............................................8 6 General requirements .......................................................................................................9 6.1 Coating ...................................................................................................................9 6.2 Buffer ......................................................................................................................9 6.3 Colours of the coating and/or buffer ........................................................................9 Table 1 − Sectional specifications ...........................................................................................5 Table 2 – Categories of multimode fibres ................................................................................7 Table 3 – Categories of glass core/glass clad single-mode fibres............................................8 Table 4 – Categories of glasscor/glass clad single mode fibres for intraconnection .................8 60793-2 © IEC:2007 – 3– INTERNATIONAL ELECTROTECHNICAL COMMISSION ___________ OPTICAL FIBRES – Part 2: Product specifications – General FOREWORD 1) The 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 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 committees; 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 for 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 committee 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 accurate, 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 regional 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 conformity 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 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 drawn 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 be held responsible for identifying any or all such patent rights. International Standard IEC 60793-2 has been prepared by subcommittee 86A: Fibres and cables, of IEC technical committee 86: Fibre optics. This sixth edition cancels and replaces the fifth edition published in 2003. This modification has been necessary because of the addition of new fibre categories to IEC 60793-2-40, IEC 60793-2-50 and IEC 60793-2-60. Document ID Fibre category 60793-2-10 A1 60793-2-20 A2 60793-2-30 A3 60793-2-40 A4 60793-2-50 B (all) 60793-2-60 C – – 60793-2 © IEC:2007 4 This standard is to be read in conjunction with IEC 60793-1 series. The text of this standard is based on the following documents: FDIS Report on voting 86A/1168/FDIS 86A/1192/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 Directives, Part 2. A list of all parts of the 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 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. 60793-2 © IEC:2007 – 5– OPTICAL FIBRES – Part 2: Product specifications – General 1 Scope This part of IEC 60793 contains the general specifications for both multimode and single- mode optical fibres. Sectional specifications for each of the four multimode categories: A1, A2, A3, and A4 contain requirements specific to each category. A sectional specification for all single-mode categories contains requirements common to all single-mode fibres. Within each sectional specification, family specifications – found as normative annexes – contain requirements for the applicable sub-categories. These sub-categories are distinguished on the basis of different fibre types or applications. The requirements of this standard apply to all categories. Each sectional specification contains the requirements that are common to all the family specifications that are within it. These common requirements are copied to the family specification for ease of reference. Tests or measurement methods are defined for each specified attribute. Where possible, these definitions are by reference to an IEC standard – otherwise the test or measurement method is outlined in the relevant sectional specification. The following table defines the sectional specifications. The relevant family specifications are defined within the sectional specifications as normative annexes (see Tables 2 and 3) Table 1 − Sectional specifications Document ID Fibre category Cladding material Core material Index profile 60793-2-10 A1 multi-mode Glass Glass Graded 60793-2-20 A2 multi-mode Glass Glass Quasi step or step 60793-2-30 A3 multi-mode Plastic Glass Step 60793-2-40 A4 multi-mode Plastic Plastic Step, multi-step, or graded index fibre 60793-2-50 B single-mode Glass Glass Not applicable 60793-2-60 C single mode Glass Glass Not applicable 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 (including any amendments) applies. IEC 60304, Standard colours for insulation for low-frequency cables and wires IEC 60793-1 (all parts), Optical fibres − Part 1: Measurement methods and test procedures IEC 60793-2-10, Optical fibres − Part 2-10: Product specifications – Sectional specification for category A1 multimode fibres – – 60793-2 © IEC:2007 6 IEC 60793-2-20, Optical fibres − Part 2-20: Product specifications – Sectional specification for category A2 multimode fibres IEC 60793-2-30, Optical fibres − Part 2-30: Product specifications – Sectional specification for category A3 multimode fibres IEC 60793-2-40, Optical fibres − Part 2-40: Product specifications – Sectional specification for category A4 multimode fibres IEC 60793-2-50, Optical fibres − Part 2-50: Product specifications – Sectional specification for category B single-mode fibres IEC 60793-2-60, Optical fibres – Part 2-60: Product specifications – Sectional specification for category C single-mode intraconnection fibres 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 multimode fibres fibres for which the photons follow a multiplicity of paths though the fibre core. An optical fibre along whose core the radiation of two or more bound modes can propagate at the wavelength of interest 3.2 single-mode fibres fibres for which only one light path is followed for wavelengths greater than the cut-off wavelength. An optical fibre in which the radiation of only one bound mode can propagate at the wavelength of interest 3.3 core the central region of an optical fibre, generally with higher refractive index, through which most of the optical power is transmitted 3.4 cladding the dielectric material of an optical fibre surrounding the core 3.5 primary coating thin primary coating applied directly to the cladding, usually at the time of the fibre drawing, in one or more layers, to preserve the integrity of the cladding surface NOTE A secondary coating may be applied directly to the primary coating, of one or more fibres, to reinforce the protection of the optical fibre during handling and cabling. 3.6 buffer material or assembly of materials used to protect the optical fibre against physical damage 3.7 coloured coating and/or buffer A thin coating and/or buffer applied on the primary coating and/or buffer or on the secondary coating in order to make each fibre distinguishable by its colour 60793-2 © IEC:2007 – 7– 4 Quality assurance It is the responsibility of the supplier to establish quality assurance by quality control procedures which ensure that the product meets the requirements of this standard and the subsidiary sectional specifications and family specifications. It is not intended that a complete testing programme be carried out on every length of fibre. When the customer wishes to specify acceptance tests or other quality procedures, it is essential that an agreement be reached between the supplier and the customer at the time of ordering. 5 Construction of optical fibres 5.1 Category A – Multimode fibres Fibre categories are based on g, the refractive index profile parameter. The normalized index profile is expressed as: ( ) gxxδ −= 1 (1) where ( ) ( ) ( )( ) ( )10 1 nn nxnxδ − − = (2a) a r x = ( )ar ≤≤0 is the normalized radial position; (2b) a is the core radius; n(x) is the refractive index at normalized position x. Table 2 – Categories of multimode fibres Category Material Type Limits A1 Glass core/glass cladding Graded index fibre 1 ≤ g < 3 A2 Glass core/glass cladding Step and quasi step index fibre 3 ≤ g < ∞ A3 Glass core/plastic cladding Step index fibre 10 ≤ g < ∞ A4 Plastic core/plastic cladding Step, multi-step, or graded index fibre 1 ≤ g < ∞ NOTE Attention is drawn to the index profile as stated in the detail specification. The fibre category is determined on the basis of the material type and the g value which best fits the normalized refractive index profile, falling within the category defined above. 5.2 Category B – Single-mode fibres The categories of single-mode fibres currently in use are given in Table 3. – – 60793-2 © IEC:2007 8 Table 3 – Categories of glass core/glass clad single-mode fibres Category Type Description B1.1 Dispersion unshifted This dispersion unshifted single mode fibre is optimized for use in the 1 310 nm region but can be used in the 1 550 nm region. Depending on link length and bit rates, dispersion may need accommodation in the 1 550 nm region. B1.2 Cut-off shifted This category of dispersion unshifted single-mode fibre is optimized for low loss in the 1 550 nm region. B1.3 Extended band This category of dispersion unshifted single-mode fibre is to extend the range of possible transmission signals, using 1 310 nm band power budgets, to portions of the band above 1 360 nm and below 1 530 nm. Chromatic dispersion in this band may impose requirements either on the maximum link length, or the need for accommodation. B2 Dispersion shifted This dispersion-shifted single-mode fibre is optimized for single-channel transmission in the 1 550 nm region. Multiple channels can only be transmitted if care is taken to avoid the effects of four-wave mixing by, for example, moderating the power levels or appropriate spacing or placement of the channels. B4 Non-zero dispersion-shifted This dispersion-shifted single-mode fibre is optimised for multiple channel transmission in the 1 550 nm region. The dispersion coefficient is required to be non-zero throughout the band from 1 530 nm to 1 565 nm, but may be either positive or negative. Depending on the dispersion characteristics, multiple channel transmission may be possible at bands either above or below the norm