1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationFibre optic communication subsystem test proceduresPart 2-2: Digital systems Optical eye pattern, waveform and extinction ratio measurementBS EN 61280-2-2:2012Copyright European
2、Committee for Electrotechnical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-National forewordThis British Standard is the UK implementation of EN 61280-2-2:2012. It isidentical to IEC 61280-2-2:2012. It s
3、upersedes BS EN 61280-2-2:2008 whichis withdrawn.The UK participation in its preparation was entrusted by Technical CommitteeGEL/86, Fibre optics, to Subcommittee GEL/86/3, Fibre optic systems andactive devices.A list of organizations represented on this committee can be obtained onrequest to its se
4、cretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. The British Standards Institution 2013Published by BSI Standards Limited 2013ISBN 978 0 580 74167 8ICS 33.180.01Compliance with a British Standard cannot
5、 confer immunity fromlegal obligations.This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on 31 March 2013.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 61280-2-2:2012Copyright European Committee for Electrotech
6、nical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EUROPEAN STANDARD EN 61280-2-2 NORME EUROPENNE EUROPISCHE NORM December 2012 CENELEC European Committee for Electrotechnical Standardization Comit Europe
7、n de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61280-2-2:2012 E ICS 33.180.01 Supers
8、edes EN 61280-2-2:2008 English version Fibre optic communication subsystem test procedures - Part 2-2: Digital systems - Optical eye pattern, waveform and extinction ratio measurement (IEC 61280-2-2:2012) Procdures dessai des sous-systmes de tlcommunications fibres optiques - Partie 2-2: Systmes num
9、riques - Mesure du diagramme de loeil optique, de la forme donde et du taux dextinction (CEI 61280-2-2:2012) Prfverfahren fr Lichtwellenleiter-Kommunikationsuntersysteme - Teil 2-2: Digitale Systeme - Messung des optischen Augendiagramms, der Wellenform und des Extinktionsverhltnisses (IEC 61280-2-2
10、:2012) This European Standard was approved by CENELEC on 2012-11-29. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliogra
11、phical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the respons
12、ibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland
13、, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 61280-2-2:2012Copyright E
14、uropean Committee for Electrotechnical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 61280-2-2:2012 - 2 - Foreword The text of document 86C/1043/CDV, future edition 4 of IEC 61280-2-2, prepared by SC 86
15、C “Fibre optic systems and active devices“ of IEC/TC 86 “Fibre optics“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 61280-2-2:2012. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical
16、national standard or by endorsement (dop) 2013-08-29 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2015-11-29 This document supersedes EN 61280-2-2:2008. EN 61280-2-2:2012 includes the following significant technical changes with respect to EN 6
17、1280-2-2:2008: - additional definitions; - clarification of test procedures. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. Endorseme
18、nt notice The text of the International Standard IEC 61280-2-2:2012 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60825-1 NOTE Harmonised as EN 60825-1. IEC 612
19、81-1 NOTE Harmonised as EN 61281-1. BS EN 61280-2-2:2012Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- 3 - EN 61280-2-2:2012 Annex ZA (normative) Normative
20、 references to international publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references,
21、the latest edition of the referenced document (including any amendments) applies. NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 61280-2-3 - Fibre optic communication subsystem te
22、st procedures - Part 2-3: Digital systems - Jitter and wander measurements EN 61280-2-3 - BS EN 61280-2-2:2012Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,
23、- 2 61280-2-2 IEC:2012(E) CONTENTS 1 Scope . 6 2 Normative references . 6 3 Terms and definitions . 6 4 Apparatus . 7 4.1 General . 7 4.2 Reference receiver definition . 8 4.3 Time-domain optical detection system . 8 4.3.1 Overview . 8 4.3.2 Optical-to-electrical (O/E) converter . 9 4.3.3 Linear-pha
24、se low-pass filter . 9 4.3.4 Oscilloscope 10 4.4 Overall system response . 11 4.5 Oscilloscope synchronization system. 11 4.5.1 General . 11 4.5.2 Triggering with a clean clock . 12 4.5.3 Triggering using a recovered clock 12 4.5.4 Triggering directly on data . 13 4.6 Pattern generator 14 4.7 Optica
25、l power meter 14 4.8 Optical attenuator 14 4.9 Test cord . 14 5 Signal under test 14 6 Instrument set-up and device under test set-up 14 7 Measurement procedures . 15 7.1 Overview . 15 7.2 Extinction ratio measurement 15 7.2.1 Configure the test equipment . 15 7.2.2 Measurement procedure 15 7.2.3 Ex
26、tinction ratio calculation . 16 7.3 Eye amplitude . 17 7.4 Optical modulation amplitude (OMA) measurement using the square wave method 17 7.4.1 General . 17 7.4.2 Oscilloscope triggering 17 7.4.3 Amplitude histogram, step 1 17 7.4.4 Amplitude histogram, step 2 18 7.4.5 Calculate OMA 18 7.5 Contrast
27、ratio (for RZ signals) . 18 7.6 Jitter measurements 18 7.7 Eye width 19 7.8 Duty cycle distortion (DCD) . 19 7.9 Crossing percentage . 20 7.10 Eye height . 21 BS EN 61280-2-2:2012Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECNot for Resal
28、eNo reproduction or networking permitted without license from IHS-,-,-61280-2-2 IEC:2012(E) 3 7.11 Q-factor/signal-to-noise ratio (SNR). 21 7.12 Rise time . 21 7.13 Fall time 22 8 Eye-diagram analysis using a mask 23 8.1 Eye mask testing using the no hits technique . 23 8.2 Eye mask testing using th
29、e hit-ratio technique . 24 9 Test result 26 9.1 Required information . 26 9.2 Available information . 26 9.3 Specification information . 26 Bibliography 27 Figure 1 Optical eye pattern, waveform and extinction ratio measurement configuration . 8 Figure 2 Oscilloscope bandwidths commonly used in eye
30、pattern measurements . 10 Figure 3 PLL jitter transfer function and resulting observed jitter transfer function 13 Figure 4 Histograms centred in the central 20 % of the eye used to determine the mean logic one and 0 levels, b1and b0. 16 Figure 5 OMA measurement using the square wave method 18 Figur
31、e 6 Construction of the duty cycle distortion measurement . 20 Figure 7 Construction of the crossing percentage measurement 21 Figure 8 Construction of the risetime measurement with no reference receiver filtering . 22 Figure 9 Illustrations of several RZ eye-diagram parameters 23 Figure 10 Basic ey
32、e mask and coordinate system 24 Figure 11 Mask margins at different sample population sizes . 26 Table 1 Frequency response characteristics 11 BS EN 61280-2-2:2012Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproduction
33、 or networking permitted without license from IHS-,-,- 6 61280-2-2 IEC:2012(E) FIBRE OPTIC COMMUNICATION SUBSYSTEM TEST PROCEDURES Part 2-2: Digital systems Optical eye pattern, waveform and extinction ratio measurement 1 Scope The purpose of this part of IEC 61280 is to describe a test procedure to
34、 verify compliance with a predetermined waveform mask and to measure the eye pattern and waveform parameters such as rise time, fall time, modulation amplitude and extinction ratio. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and a
35、re indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 61280-2-3, Fibre optic communication subsystem test procedures Part 2-3: Digital systems Jitter an
36、d wander measurements 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 amplitude histogram graphical means to display the power or voltage population distribution of a waveform 3.2 contrast ratio ratio of the nominal peak amplitude to the nomi
37、nal minimum amplitude of two adjacent logical 1s when using return-to-zero transmission 3.3 duty cycle distortion DCD measure of the balance of the time width of a logical 1 bit to the width of a logical 0 bit, indicated by the time between the eye diagram nominal rising edge at the average or 50 %
38、level and the eye diagram nominal falling edge at the average or 50 % level 3.4 extinction ratio ratio of the nominal 1 level to the nominal 0 level of the eye diagram 3.5 eye diagram type of waveform display that exhibits the overall performance of a digital signal by superimposing all the acquired
39、 samples on a common time axis one unit interval in width BS EN 61280-2-2:2012Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-61280-2-2 IEC:2012(E) 7 3.6 eye
40、 height difference between the 1 level, measured three standard deviation below the nominal 1 level of the eye diagram, and 0 level, measured three standard deviations above the nominal 0 level of the eye diagram 3.7 eye mask constellation of polygon shapes that define regions where the eye diagram
41、may not exist, thereby effectively defining the allowable shape of the transmitter waveform 3.8 eye width time difference between the spread of the two crossing points of an eye diagram, each measured three standard deviations toward the centre of the eye from their nominal positions 3.9 jitter devi
42、ation of the logical transitions of a digital signal from their ideal positions in time manifested in the eye diagram as the time width or spread of the crossing point 3.10 observed jitter transfer function OJTF ratio of the displayed or measured jitter relative to actual jitter, versus jitter frequ
43、ency, when a test system is synchronized with a clock derived from the signal being measured 3.11 reference receiver description of the frequency and phase response of a test system, typically a fourth-order Bessel-Thomson low-pass, used to analyze transmitter waveforms with the intent of achieving
44、consistent results whenever the test system complies with this expected response 3.12 signal-to-noise ratio SNR similar to Q-factor, the ratio of the difference of the nominal 1 and 0 level of the eye diagram to the sum of the standard deviation of both the 1 level and the 0 level of the eye diagram
45、 3.13 unit interval for the NRZ signal, the unit interval is one bit period or the inverse of the signalling rate 4 Apparatus 4.1 General The primary components of the measurement system are a photodetector, a low-pass filter, an oscilloscope, and an optical power meter, as shown in Figure 1. Many t
46、ransmitter characteristics are derived from analysis of the transmitter time-domain waveform. Transmitter waveform characteristics can vary depending on the frequency response and bandwidth of the test system. To achieve consistent results, the concept of a reference receiver is used. The reference
47、receiver definition defines the combined frequency and phase response of the optical-to-electrical converter, any filtering, and the oscilloscope. The reference receiver frequency response is typically a low pass filter design and is discussed in detail in 4.2. At high signalling rates, reference re
48、ceiver frequency response can be difficult to achieve when configured using individual components. It is common to integrate the reference receiver within the oscilloscope system to achieve reference receiver specifications. Use of a BS EN 61280-2-2:2012Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- 8 61280-2-2 IEC:2012(E) low-pass filter which alone achieves reference rece
