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1、TECHNICAL REPORT IEC TR 61282-7 First edition 2003-01 Fibre optic communication system design guides Part 7: Statistical calculation of chromatic dispersion Guides de conception des systmes de communications fibres optiques Partie 7: Calcul statistique de la dispersion chromatique Reference number I
2、EC/TR 61282-7:2003(E) Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/06/2007 06:27:30 MSTNo reproduction or networking permitted without license from IHS -,-,- Publication numbering
3、 As from 1 January 1997 all IEC publications are issued with a designation in the 60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1. Consolidated editions The IEC is now publishing consolidated versions of its publications. For example, edition numbers 1.0, 1.1 and 1.2 refer, res
4、pectively, to the base publication, the base publication incorporating amendment 1 and the base publication incorporating amendments 1 and 2. Further information on IEC publications The technical content of IEC publications is kept under constant review by the IEC, thus ensuring that the content ref
5、lects current technology. Information relating to this publication, including its validity, is available in the IEC Catalogue of publications (see below) in addition to new editions, amendments and corrigenda. Information on the subjects under consideration and work in progress undertaken by the tec
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9、ail: custserviec.ch Tel: +41 22 919 02 11 Fax: +41 22 919 03 00 Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/06/2007 06:27:30 MSTNo reproduction or networking permitted without li
10、cense from IHS -,-,- TECHNICAL REPORT IEC TR 61282-7 First edition 2003-01 Fibre optic communication system design guides Part 7: Statistical calculation of chromatic dispersion Guides de conception des systmes de communications fibres optiques Partie 7: Calcul statistique de la dispersion chromatiq
11、ue PRICE CODE IEC 2003 Copyright - all rights reserved 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 the publisher. International Electrotechnical Commission, 3
12、, rue de Varemb, PO Box 131, CH-1211 Geneva 20, Switzerland Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmailiec.ch Web: www.iec.ch G For price, see current catalogue Commission Electrotechnique Internationale International Electrotechnical Commission Copyright International Elect
13、rotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/06/2007 06:27:30 MSTNo reproduction or networking permitted without license from IHS -,-,- 2 TR 61282-7 IEC:2003(E) CONTENTS FOREWORD 3 1Scope 4 2Normative referen
14、ces. 4 3Characterisation of chromatic dispersion coefficient versus wavelength. 5 4Characterisation of chromatic dispersion coefficient statistics versus wavelength 6 5Calculation of the concatenation statistics for a single population of optical fibres 9 6Generalisation of concatenation statistics
15、for multiple populations including components. . 10 Figure 1 Distribution of dispersion parameters. 6 Figure 2 Histogram of values at 1 560 nm 7 Figure 3 Histogram of values at 1 530 nm 7 Figure 4 Average dispersion coefficient versus wavelength . 8 Figure 5 Standard deviation of dispersion coeffici
16、ent versus wavelength. 8 Figure 6 Fibre average 11 Figure 7 Fibre standard deviation 11 Figure 8 Dispersion compensator average. 12 Figure 9 Dispersion compensator standard deviation. 12 Figure 10 Combined three sigma limits 13 Table 1 Computed values at two selected wavelengths . 10 Copyright Inter
17、national Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/06/2007 06:27:30 MSTNo reproduction or networking permitted without license from IHS -,-,- TR 61282-7 IEC:2003(E) 3 INTERNATIONAL ELECTROTECHNICAL CO
18、MMISSION _ FIBRE OPTIC COMMUNICATION SYSTEM DESIGN GUIDES Part 7: Statistical calculation of chromatic dispersion FOREWORD 1)The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committee
19、s). The object of the 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, the IEC publishes International Standards. Their preparation is entrusted to technical committees;
20、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. The IEC collaborates closely with the International Organization for St
21、andardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2)The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee
22、has representation from all interested National Committees. 3)The documents produced have the form of recommendations for international use and are published in the form of standards, technical specifications, technical reports or guides and they are accepted by the National Committees in that sense
23、. 4)In order to promote international unification, IEC National Committees undertake to apply IEC International Standards transparently to the maximum extent possible in their national and regional standards. Any divergence between the IEC Standard and the corresponding national or regional standard
24、 shall be clearly indicated in the latter. 5)The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with one of its standards. 6)Attention is drawn to the possibility that some of the elements of this technical
25、 report may be the subject of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights. The main task of IEC technical committees is to prepare International Standards. However, a technical committee may propose the publication of a technical report when it
26、has collected data of a different kind from that which is normally published as an International Standard, for example “state of the art“. IEC 61282-7, which is a technical report, has been prepared by subcommittee 86C: Fibre optic systems and active devices, of IEC technical committee 86: Fibre opt
27、ics. The text of this technical report is based on the following documents: Enquiry draftReport on voting 86C/429/DTR86C/468/RVC Full information on the voting for the approval of this technical report can be found in the report on voting indicated in the above table. This publication has been draft
28、ed in accordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this publication will remain unchanged until 2009-12. At this date, the publication will be reconfirmed; withdrawn; replaced by a revised edition, or amended. Copyright International Electrotechnical
29、 Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/06/2007 06:27:30 MSTNo reproduction or networking permitted without license from IHS -,-,- 4 TR 61282-7 IEC:2003(E) FIBRE OPTIC COMMUNICATION SYSTEM DESIGN GUIDES Part 7: Sta
30、tistical calculation of chromatic dispersion 1 Scope This part of IEC 61282 is a guideline providing methods of representing the process statistics of the chromatic dispersion of optical fibres and related components that may be combined in a link. Chromatic dispersion (ps/nm) is the derivative, wit
31、h respect to wavelength, of the group delay (ps) induced by the spectral content of light propagating through an optical element or fibre. Chromatic dispersion is normally a function of wavelength and can be either positive (group delay increasing with wavelength) or negative (group delay decreasing
32、 with wavelength). The presence of chromatic dispersion can induce distortions in signals leading to bit errors depending on source spectral width; source chirp; bit period; distance. In addition, chromatic dispersion is interactive with the effects of non-linear optical effects and second order pol
33、arisation mode dispersion (PMD). The above system impairments are beyond the scope of this technical report. When different components or fibres are combined, the chromatic dispersion of the combination is the total of the chromatic dispersion values of the individuals, on a wavelength- by-wavelengt
34、h basis. A section with high chromatic dispersion will be balanced by sections with lower values. The variation in the total dispersion of links will therefore be dependent on the distributions of the products that are used in the link. This document provides methods to calculate the distribution st
35、atistics of concatenated links based on information on the distributions of different fibre or component populations. NOTE In the clauses that follow, examples are given for particular fibre and component types. These examples are not necessarily broadly representative. 2 Normative references The fo
36、llowing 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 60793-1-42: Optical fibres Part 1-42: Measurement m
37、ethods and test procedures Chromatic dispersion IEC 60793-2-50: Optical fibres Part 2-50: Product specifications Sectional specification for class B single-mode fibres ITU-T Recommendation G.652: Characteristics of a single-mode optical fibre cable ITU-T Recommendation G.655: Characteristics of a no
38、n-zero dispersion shifted single-mode optical fibre cable Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/06/2007 06:27:30 MSTNo reproduction or networking permitted without license
39、from IHS -,-,- TR 61282-7 IEC:2003(E) 5 ITU-T Recommendation G.671: Transmission characteristics of optical components and subsystems ITU-T Recommendation G.691: Optical interfaces for single-channel STM-64, STM-256 and other SDH systems with optical amplifiers 3 Characterisation of chromatic disper
40、sion coefficient versus wavelength This clause outlines the characterisation of dispersion as a function of wavelength for a given wavelength range. This function is often represented as a formula that includes parameters that can vary from fibre to fibre for a given fibre design. Characterisations
41、of these formulas should give an indication of the wavelength range over which the formula applies. Extrapolation beyond these ranges can result in error. For optical fibre, chromatic dispersion coefficient, D, can vary with wavelength, , according to a variety of formula types that are found in IEC
42、 60793-1-42. The simplest is the linear representation which has just two parameters, zero-dispersion wavelength, 0, and zero- dispersion slope, S0, as: ( )() 00 = SD (ps/nm km)(1) Measurements are based either on fitting differential group delays (DGD) or by fitting the integral to the measured gro
43、up delay. Other forms defined in 60793-1-42 are the three-term Sellmeier (Equation (2), and the five- term Sellmeier (Equation (3). Note that for the five-term Sellmeier, parameters, Cj, different from the zero-dispersion wavelength and slope must be fitted. ( ) = 4 00 1 4 S D(2) ( ) 5 4 3 3 3 21 44
44、22 +=CCCCD(3) For components, similar types of expressions can be used to characterise the chromatic dispersion value, d, as a function of wavelength. For components, however, the units are most often given as ps/nm (unadjusted for length). The use of the term “coefficient,” for fibre indicates a le
45、ngth normalisation. Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/06/2007 06:27:30 MSTNo reproduction or networking permitted without license from IHS -,-,- 6 TR 61282-7 IEC:2003(E
46、) Even for the products for which the linear representation of Equation (1) is appropriate for each individual fibre, the combination of the distributions of the zero-dispersion wavelength and slope will normally not lead to a very clear understanding of the distribution of chromatic dispersion. Fig
47、ure 1 shows such a combined distribution that illustrates a correlation between the dispersion parameters. 0,050 0,055 0,060 0,065 0,070 0,075 0,080 0,085 0,090 0,095 0,100 1 5601 5621 5641 5661 5681 5701 5721 5741 5761 578 Lambda-0 nm S0 IEC 3207/02 Figure 1 Distribution of dispersion parameters 4
48、Characterisation of the chromatic dispersion coefficient statistics versus wavelength This clause outlines the technique used to characterise the distribution of a single population of fibres. Similar approaches can be applied to components. The fibre distribution shown in Figure 1 was intended for use in the wavelength range of 1 530 nm to 1 560 nm a B4 type fibre (ITU-T G.65