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
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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
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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
