1、 INTERNATIONAL STANDARD IECCEINORME INTERNATIONALE60793-1-48Second editionDeuxime dition2007-06Optical fibres Part 1-48: Measurement methods and test procedures Polarization mode dispersion Fibres optiques Partie 1-48: Mthodes de mesure et procdures dessai Dispersion du mode de polarisation Referenc
2、e number Numro de rfrence IEC/CEI 60793-1-48:2007 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, includin
3、g photocopying and microfilm, without permission in writing from either IEC or IECs 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 y
4、our local IEC member National Committee for further information. Droits de reproduction rservs. Sauf indication contraire, aucune partie de cette publication ne peut tre reproduite ni utilise sous quelque forme que ce soit et par aucun procd, lectronique ou mcanique, y compris la photocopie et les m
5、icrofilms, sans laccord crit de la CEI ou du Comit national de la CEI du pays du demandeur. Si vous avez des questions sur le copyright de la CEI ou si vous dsirez obtenir des droits supplmentaires sur cette publication, utilisez les coordonnes ci-aprs ou contactez le Comit national de la CEI de vot
6、re pays de rsidence. IEC Central Office 3, rue de Varemb CH-1211 Geneva 20 Switzerland Email: inmailiec.ch Web: www.iec.ch About the IEC The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standards for all electrical, elec
7、tronic and related technologies. About IEC publications The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the latest edition, a corrigenda or an amendment might have been published. Catalogue of IEC publications: www.iec.ch/searchpub T
8、he IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,). It also gives information on projects, withdrawn and replaced publications. IEC Just Published: www.iec.ch/online_news/justpub Stay up to date on all new IEC publications. Just Pub
9、lished details twice a month all new publications released. Available on-line and also by email. Customer Service Centre: www.iec.ch/webstore/custserv If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service Centre FAQ or contact us: Emai
10、l: csciec.ch Tel.: +41 22 919 02 11 Fax: +41 22 919 03 00 A propos de la CEI La Commission Electrotechnique Internationale (CEI) est la premire organisation mondiale qui labore et publie des normes internationales pour tout ce qui a trait llectricit, llectronique et aux technologies apparentes. A pr
11、opos des publications CEI Le contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possdez ldition la plus rcente, un corrigendum ou amendement peut avoir t publi. Catalogue des publications de la CEI: www.iec.ch/searchpub/cur_fut-f.htm Le Catalogue en-lig
12、ne de la CEI vous permet deffectuer des recherches en utilisant diffrents critres (numro de rfrence, texte, comit dtudes,). Il donne aussi des informations sur les projets et les publications retires ou remplaces. Just Published CEI: www.iec.ch/online_news/justpub Restez inform sur les nouvelles pub
13、lications de la CEI. Just Published dtaille deux fois par mois les nouvelles publications parues. Disponible en-ligne et aussi par email. Service Clients: www.iec.ch/webstore/custserv/custserv_entry-f.htm Si vous dsirez nous donner des commentaires sur cette publication ou si vous avez des questions
14、, visitez le FAQ du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 INTERNATIONAL STANDARD IECCEINORME INTERNATIONALE60793-1-48Second editionDeuxime dition2007-06Optical fibres Part 1-48: Measurement methods and test procedures Polarization mode disper
15、sion Fibres optiques Partie 1-48: Mthodes de mesure et procdures dessai Dispersion du mode de polarisation X Commission Electrotechnique InternationaleInternational Electrotechnical Commission PRICE CODE CODE PRIX For price, see current cataloguePour prix, voir catalogue en vigueur 2 60793-1-48 IEC:
16、2007 CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative references .7 3 Terms and definitions .8 4 General 8 4.1 Methods for measuring PMD .8 4.2 Reference test method 10 4.3 Applicability.10 5 Apparatus.11 5.1 Light source and polarizers .11 5.2 Input optics .11 5.3 Input positioner .12 5.4 C
17、ladding mode stripper .12 5.5 High-order mode filter12 5.6 Output positioner.12 5.7 Output optics.12 5.8 Detector 12 5.9 Computer 12 6 Sampling and specimens12 6.1 General .12 6.2 Specimen length13 6.3 Deployment .13 7 Procedure 14 8 Calculation or interpretation of results 14 9 Documentation .14 9.
18、1 Information required for each measurement 14 9.2 Information to be available 14 10 Specification information 15 Annex A (normative) Fixed analyser measurement method 16 Annex B (normative) Stokes evaluation method .27 Annex C (normative) Interferometry method.32 Annex D (informative) Determination
19、 of RMS width from a fringe envelope 42 Annex E (informative) Glossary of symbols 46 Bibliography48 Figure A.1 Block diagrams for Method A 16 Figure A.2 Typical results from Method A.19 Figure A.3 PMD by Fourier analysis.22 Figure A.4 Cross-correlation and autocorrelation functions 26 60793-1-48 IEC
20、:2007 3 Figure B.1 Block diagram for Method B27 Figure B.2 Typical random-mode-coupling results from Method B 29 Figure B.3 Typical histogram of DGD values 29 Figure C.1 Schematic diagram for Method C (generic implementation).32 Figure C.2 Other schematic diagrams for Method C .34 Figure C.3a Random
21、 mode-coupling using a TINTY-based measurement system with one I/O SOP 37 Figure C.3b Negligible mode-coupling using a TINTY-based measurement system with one I/O SOP 37 Figure C.3 Fringe envelopes for negligible and random polarization mode-coupling.37 Figure C.4a Random mode-coupling using a GINTY
22、-based measurement system with I/O-SOP scrambling.38 Figure C.4b Negligible mode-coupling using a GINTY-based measurement system with I/O-SOP scrambling.38 Figure C.4c Mixed mode-coupling using a GINTY-based measurement system with I/O-SOP scrambling 39 Figure C.4 Fringe envelopes for negligible and
23、 random polarization mode-coupling (Ginty procedure)39 Figure D.1 Parameters for interferogram analysis 42 Table A.1 Cosine transform calculations 25 4 60793-1-48 IEC:2007 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ OPTICAL FIBRES Part 1-48: Measurement methods and test procedures Polarization mode
24、dispersion 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 standardiza
25、tion 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
26、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 In
27、ternational 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 sin
28、ce 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
29、 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
30、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
31、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 Nat
32、ional 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
33、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 sha
34、ll not be held responsible for identifying any or all such patent rights. International Standard IEC 60793-1-48 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 2003. It cons
35、titutes a technical revision. In this edition, reference to IEC 61282-9 has resulted in the removal of Annexes E, F, G and H as well as the creation of a new Annex E. The text of this standard is based on the following documents: CDV Report on voting 86A/1038/CDV 86A/1078/RVC Full information on the
36、 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. 60793-1-48 IEC:2007 5 This standard is to be read in conjunction with IEC 60793-1-1. A list of all parts o
37、f 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 r
38、elated to the specific publication. At this date, the publication will be reconfirmed; withdrawn; replaced by a revised edition, or amended. 6 60793-1-48 IEC:2007 INTRODUCTION Polarization mode dispersion (PMD) causes an optical pulse to spread in the time domain. This dispersion could impair the pe
39、rformance of a telecommunications system. The effect can be related to differential phase and group velocities and corresponding arrival times of different polarization components of the signal. For a sufficiently narrow band source, the effect can be related to a differential group delay (DGD), , b
40、etween pairs of orthogonally polarized principal states of polarization (PSP) at a given wavelength. For broadband transmission, the delays bifurcate and result in an output pulse that is spread out in the time domain. In this case, the spreading can be related to the average of DGD values. In long
41、fibre spans, DGD is random in both time and wavelength since it depends on the details of the birefringence along the entire fibre length. It is also sensitive to time-dependent temperature and mechanical perturbations on the fibre. For this reason, a useful way to characterize PMD in long fibres is
42、 in terms of the expected value, , or the mean DGD over wavelength. In principle, the expected value does not undergo large changes for a given fibre from day to day or from source to source, unlike the parameters or . In addition, is a useful predictor of lightwave system performance. The term “PMD
43、“ is used both in the general sense of two polarization modes having different group velocities, and in the specific sense of the expected value . The DGD or pulse broadening can be averaged over wavelength, yielding , or time, yielding t, or temperature, yielding T. For most purposes, it is not nec
44、essary to distinguish between these various options for obtaining . The coupling length lcis the length of fibre or cable at which appreciable coupling between the two polarization states begins to occur. If the fibre length L satisfies the condition L scales with fibre length. The corresponding PMD
45、 coefficient is “short-length“ PMD coefficient = /L. Fibres in practical systems are nearly always in the L lc, regime and mode coupling is random. If mode coupling is also found to be random, scales with the square root of fibre length, and “long-length“ PMD coefficient = / L 60793-1-48 IEC:2007 7
46、OPTICAL FIBRES Part 1-48: Measurement methods and test procedures Polarization mode dispersion 1 Scope This part of IEC 60793 applies to three methods of measuring polarization mode dispersion (PMD), which are described in Clause 4. It establishes uniform requirements for measuring the PMD of single
47、-mode optical fibre, thereby assisting in the inspection of fibres and cables for commercial purposes. 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 l
48、atest edition of the referenced document (including any amendments) applies. IEC 60793-1-1, Optical fibres Part 1-1: Measurement methods and test procedures General and guidance IEC 60793-1-44, Optical fibres Part 1-44: Measurement methods and test procedures Cut-off wavelength IEC 60793-2-50, Optic
49、al fibres Part 2-50: Product specifications Sectional specification for class B single-mode fibres IEC 60794-3, Optical fibre cables Part 3: Sectional specification Outdoor cables IEC 61280-4-4, Fibre optic communication subsystem test procedures Part 4-4: Cable plants and links Polarization mode dispersion measure
copyright@ 2008-2019 麦多课文库（www.mydoc123.com）网站版权所有
备案/许可证编号：苏ICP备17064731号-1