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1、 TECHNICAL REPORT IEC TR 61282-8 First edition 2006-11 Fibre optic communication system design guides Part 8: Calculating dispersion penalty from measured time-resolved chirp data Reference number IEC/TR 61282-8:2006(E) Copyright International Electrotechnical Commission Provided by IHS under licens
2、e with IECLicensee=NASA Marshall Space Flight Center/9972545001 Not for Resale, 03/07/2007 05:41:27 MSTNo reproduction or networking permitted without license from IHS -,-,- Publication numbering As from 1 January 1997 all IEC publications are issued with a designation in the 60000 series. For examp
3、le, 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, respectively, to the base publication, the base publication incorporating amendment 1 and the base publicati
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8、ation. Customer Service Centre If you have any questions regarding this publication or need further assistance, please contact the Customer Service Centre: Email: custserviec.ch Tel: +41 22 919 02 11 Fax: +41 22 919 03 00 Copyright International Electrotechnical Commission Provided by IHS under lice
9、nse with IECLicensee=NASA Marshall Space Flight Center/9972545001 Not for Resale, 03/07/2007 05:41:27 MSTNo reproduction or networking permitted without license from IHS -,-,- TECHNICAL REPORT IEC TR 61282-8 First edition 2006-11 Fibre optic communication system design guides Part 8: Calculating dis
10、persion penalty from measured time-resolved chirp data PRICE CODE IEC 2006 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 pub
11、lisher. 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 R For price, see current catalogue Commission Electrotechnique Internationale International Elect
12、rotechnical Commission Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=NASA Marshall Space Flight Center/9972545001 Not for Resale, 03/07/2007 05:41:27 MSTNo reproduction or networking permitted without license from IHS -,-,- 2 TR 61282-8 IEC:2006(E
13、) CONTENTS FOREWORD.3 INTRODUCTION.5 1 Scope.6 2 Normative references .6 3 Terms and definitions .6 4 Measuring dispersion penalty using a bit-error-ratio test set .7 5 Obtaining time-resolved chirp data .8 6 Calculating dispersion penalty from time-resolved chirp data9 6.1 Calculate BER for a parti
14、cular condition.9 6.2 Calculate dispersion penalty10 6.3 Calculate transmitter and dispersion penalty .11 6.4 Calculate total transmitter power penalty.11 7 An example measurement and calculation of power penalties.11 8 A comparison of dispersion penalty measurements from BER and TRC measurements12
15、Annex A (informative) Data analysis of bit error ratio versus received power in digital systems 13 Bibliography20 Figure 1 Equipment setup for direct power penalty measurements.8 Figure 2 Typical TRC data suitable for dispersion penalty calculations.9 Figure 3 An example measurement of the three pow
16、er penalties12 Figure 4 Comparison of dispersion penalty results for measurements with a BER test set and for calculation from TRC data.12 Figure A.1 Plot of Equation (A.1) with SNR plotted linearly 14 Figure A.3 Example plot and analysis using the exact procedure. 18 Figure A.4 Example plot and ana
17、lysis using the log-log procedure .19 Table A.1 Values for BER versus SNR.15 Table A.2 Experimental data for exact linearization18 Table A.3 Experimental data for log-log analysis19 Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=NASA Marshall Space
18、 Flight Center/9972545001 Not for Resale, 03/07/2007 05:41:27 MSTNo reproduction or networking permitted without license from IHS -,-,- TR 61282-8 IEC:2006(E) 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ FIBRE OPTIC COMMUNICATION SYSTEM DESIGN GUIDES Part 8: Calculating dispersion penalty from meas
19、ured time-resolved chirp data 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 con
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28、tions. 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 pa
29、tent rights. 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 has collected data of a different ki
30、nd from that which is normally published as an International Standard, for example “state of the art“. IEC 61282-8, 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 repo
31、rt is based on the following documents: Enquiry draft Report on voting 86C/686/DTR 86C/721/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. Copyright International Electrotechnical Commission Provided by I
32、HS under license with IECLicensee=NASA Marshall Space Flight Center/9972545001 Not for Resale, 03/07/2007 05:41:27 MSTNo reproduction or networking permitted without license from IHS -,-,- 4 TR 61282-8 IEC:2006(E) This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A
33、 list of all parts of the IEC 61282 series, published under the general title Fibre optic communication system design guides, 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
34、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. A bilingual version of this publication may be issued at a later date. Copyright International Electrotechn
35、ical Commission Provided by IHS under license with IECLicensee=NASA Marshall Space Flight Center/9972545001 Not for Resale, 03/07/2007 05:41:27 MSTNo reproduction or networking permitted without license from IHS -,-,- TR 61282-8 IEC:2006(E) 5 INTRODUCTION Dispersion penalty is a commonly used parame
36、ter of laser transmitters and is usually included as a specification for transmitters designed for 2,5 Gb/s and higher data rates. The value of the dispersion penalty is a function of the interaction of laser chirp, spectral width and fibre dispersion and will depend on the particular type of fibre.
37、 Because the type and length of the fibre specified for a particular transmitter is fixed, the dispersion penalty is determined by the temporal characteristics of the transmitter chirp, which include the spectral characteristics of the laser. As developers and manufacturers of laser transmitters are
38、 attempting to go to higher rates and longer distances, they are finding that chirp is limiting their ability to achieve a required dispersion penalty. Direct measurement of dispersion penalty requires two BER measurements over a reference receiver input range that yields BER values typically from 1
39、04 to 1012. This is typically a long measurement. Measuring time-resolved chirp (TRC) and calculating dispersion penalty can be a considerably shorter measurement. This technical report describes the procedure for calculating dispersion penalty from TRC data. Copyright International Electrotechnical
40、 Commission Provided by IHS under license with IECLicensee=NASA Marshall Space Flight Center/9972545001 Not for Resale, 03/07/2007 05:41:27 MSTNo reproduction or networking permitted without license from IHS -,-,- 6 TR 61282-8 IEC:2006(E) FIBRE OPTIC COMMUNICATION SYSTEM DESIGN GUIDES Part 8: Calcul
41、ating dispersion penalty from measured time-resolved chirp data 1 Scope This part of IEC 61282 provides definitions of dispersion penalty and other related penalties. It describes the direct measurement of these penalties using a BER test set and the calculation of the penalties from time-resolved c
42、hirp (TRC) data. Annex A provides the theory for power penalty calculations. The calculations are valid for all types of single longitudinal mode (SLM) laser transmitters intended for use in telecommunications applications at data rates of 2,5 Gbit/s and higher with NRZ modulation format. These incl
43、ude but are not limited to directly modulated DFB lasers, DFB lasers with integrated electro-absorption modulators, and DFB lasers with external Mach- Zehnder modulators. This technique is not suitable for multiple longitudinal mode (MLM) lasers or LEDs. Chromatic dispersion induced power penalty va
44、lues in this technical report are characteristics of the transmitter, which is considered to be the device-under-test (DUT). Other power penalty sources, such as nonlinear effects and amplifier noise are not covered by this document. Since dispersion penalty for a transmission link depends on the tr
45、ansmitter, receiver and fibre, the dispersion penalty parameter for a transmitter is based on a specified fibre dispersion and receiver characteristic, which should be reported with the test results. 2 Normative references The following referenced documents are indispensable for the application of t
46、his document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 61280-2-8, Fibre optic communication subsystem test procedures Digital systems Part 2-8: Determination of low BER using Q-
47、factor measurements IEC 61280-2-10, Fibre optic communication subsystem test procedures Digital systems Part 2-10: Time-resolved chirp and alpha-factor measurement of laser transmitters ITU-T Recommendation G.957, Optical interfaces for equipments and systems relating to the synchronous digital hier
48、archy 3 Terms and definitions Power penalty measurements compare BER versus received power curves for two conditions. The first condition is a reference condition. The second condition introduces impairment. Changing the received power influences BER by altering the ratio of optical signal power to the receiver noise. Therefore it is useful, but equivalent, to express BER versus received power curves as BER versus OSNR curves, where this “optica