IEC TR 61282-7-2003 Fibre optic communication system design guides - Part 7 Statistical calculation of chromatic dispersion《纤维光学通信系统的设计指南.第7部分 颜色色散的统计计算》.pdf

《IEC TR 61282-7-2003 Fibre optic communication system design guides - Part 7 Statistical calculation of chromatic dispersion《纤维光学通信系统的设计指南.第7部分 颜色色散的统计计算》.pdf》由会员分享，可在线阅读，更多相关《IEC TR 61282-7-2003 Fibre optic communication system design guides - Part 7 Statistical calculation of chromatic dispersion《纤维光学通信系统的设计指南.第7部分 颜色色散的统计计算》.pdf（20页珍藏版）》请在麦多课文档分享上搜索。

1、TECHNICAL REPORT IECTR 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 IE

2、C/TR 61282-7:2003(E)Publication numbering 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, ed

3、ition numbers 1.0, 1.1 and 1.2 refer, respectively, 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 th

4、e IEC, thus ensuring that the content reflects 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 a

5、nd work in progress undertaken by the technical committee which has prepared this publication, as well as the list of publications issued, is also available from the following: IEC Web Site (www.iec.ch) Catalogue of IEC publications The on-line catalogue on the IEC web site (http:/www.iec.ch/searchp

6、ub/cur_fut.htm) enables you to search by a variety of criteria including text searches, technical committees and date of publication. On-line information is also available on recently issued publications, withdrawn and replaced publications, as well as corrigenda. IEC Just Published This summary of

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8、e contact the Customer Service Centre: Email: custserviec.ch Tel: +41 22 919 02 11 Fax: +41 22 919 03 00TECHNICAL 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 com

9、munications fibres optiques Partie 7: Calcul statistique de la dispersion chromatique 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 per

10、mission in writing from the publisher. International Electrotechnical Commission, 3, 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 Int

11、ernationale International Electrotechnical Commission 2 TR 61282-7 IEC:2003(E) CONTENTS FOREWORD 3 1 Scope 4 2 Normative references. 4 3 Characterisation of chromatic dispersion coefficient versus wavelength. 5 4 Characterisation of chromatic dispersion coefficient statistics versus wavelength 6 5 C

12、alculation of the concatenation statistics for a single population of optical fibres 9 6 Generalisation of concatenation statistics 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 v

13、alues at 1 530 nm 7 Figure 4 Average dispersion coefficient versus wavelength . 8 Figure 5 Standard deviation of dispersion coefficient versus wavelength. 8 Figure 6 Fibre average 11 Figure 7 Fibre standard deviation 11 Figure 8 Dispersion compensator average. 12 Figure 9 Dispersion compensator stan

14、dard deviation. 12 Figure 10 Combined three sigma limits 13 Table 1 Computed values at two selected wavelengths . 10TR 61282-7 IEC:2003(E) 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ FIBRE OPTIC COMMUNICATION SYSTEM DESIGN GUIDES Part 7: Statistical calculation of chromatic dispersion FOREWORD 1)

15、The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote international co-operation on all questions concerning standardization in the electri

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21、 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 report may be the subject of patent rights. The IEC shall not be held responsible for identifying any or all such paten

22、t 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 has collected data of a different kind from that which is normally published as an International Standard, for example “

23、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 optics. The text of this technical report is based on the following documents: Enquiry draft Report on voting 86C/429/DTR 8

24、6C/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 drafted in accordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this publication

25、will remain unchanged until 2009-12. At this date, the publication will be reconfirmed; withdrawn; replaced by a revised edition, or amended. 4 TR 61282-7 IEC:2003(E) FIBRE OPTIC COMMUNICATION SYSTEM DESIGN GUIDES Part 7: Statistical calculation of chromatic dispersion 1 Scope This part of IEC 61282

26、 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, with respect to wavelength, of the group delay (ps) induced by the spectral co

27、ntent 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 with wavelength). The presence of chromatic dispersion can induce distorti

28、ons 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 polarisation mode dispersion (PMD). The above system impairments are beyond th

29、e 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-wavelength basis. A section with high chromatic dispersion will be balanced by secti

30、ons 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 statistics of concatenated links based on information on the distributions of

31、 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 following referenced documents are indispensable for the application of this

32、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 methods and test procedures Chromatic dispersion IEC 60793-2-50: Optical fib

33、res 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 non-zero dispersion shifted single-mode optical fibre cableTR 61282-7 IEC:200

34、3(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 dispersion coefficient versus wavelengt

35、h 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 of these formulas should give an

36、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 60793-1-42. The simplest is the

37、linear representation which has just two parameters, zero-dispersion wavelength, 0 , and zero- dispersion slope, S 0 , as: () ( ) 0 0 = S D (ps/nm km) (1) Measurements are based either on fitting differential group delays (DGD) or by fitting the integral to the measured group delay. Other forms defi

38、ned 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, C j , different from the zero-dispersion wavelength and slope must be fitted. () = 4 0 0 1 4 S D (2) () 5 4 3 3 3 2 1 4 4 2 2 + = C C C C D (3)

39、 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 length normalis

40、ation. 6 TR 61282-7 IEC:2003(E) 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 distributio

41、n of chromatic dispersion. Figure 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 1 560 1 562 1 564 1 566 1 568 1 570 1 572 1 574 1 576 1 578 Lambda-0 nm S 0 IEC 3207/02 Figure 1

42、Distribution of dispersion parameters 4 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 distribu

43、tion 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.655), see IEC 60793-2-50. The chromatic dispersion values for the lower end of this range are affected more by the variation of slope values for high zero-dispersion wavelength than f

44、or low zero dispersion wavelength. The combined contributions are therefore difficult to evaluate without some other means. The characterisation methodology suitable for use in concatenation statistics for this distribution alone, or for combination with other distributions is to calculate the dispe

45、rsion coefficient for each of the wavelengths in the range of the application for each individual fibre. This creates a distribution of dispersion coefficient values for each wavelength. Figures 2 and 3 show these distributions at two selected wavelengths for the distribution shown in Figure 1.TR 61

46、282-7 IEC:2003(E) 7 0 20 40 60 80 100 120 140 160 180 1,25 1,15 1,05 0,95 0,85 0,75 0,65 0,55 0,45 0,35 0,25 0,15 0,05 D(1 560) ps/nm km Frequency IEC 3208/02 Figure 2 Histogram of values at 1 560 nm 0 20 40 60 80 100 120 140 160 180 3,5 3,4 3,3 3,2 3,1 3,0 2,9 2,8 2,7 2,6 2,5 2,4 2,3 2,2 2,1 2,0 D(

47、1 530) ps/nm km Frequency IEC 3209/02 Figure 3 Histogram of values at 1 530 nm The distribution for each wavelength is characterised with an average and a standard deviation value. These statistics are then plotted versus wavelength. Figures 4 and 5 show the relationships. 8 TR 61282-7 IEC:2003(E) 3

48、,0 2,5 2,0 1,5 1,0 0,5 0 1 530 1 535 1 540 1 545 1 550 1 555 1 560 Wavelength nm Dispersion ps/nm km IEC 3210/02 Figure 4 Average dispersion coefficient versus wavelength 0,196 0,198 0,200 0,202 0,204 0,206 0,208 0,210 0,212 0,214 0,216 1 530 1 535 1 540 1 545 1 550 1 555 1 560 Wavelength nm Standard deviation ps/nm km IEC 3211/02 Figure 5 Standard deviation of dispersion coefficient versus wavelength Note that a linear relationship represents the average and a quadratic relationship represents the standard deviation. This is due in part to the linear representation of di