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1、BRITISH STANDARDBS EN61280-2-2:2008Fibre optic communication subsystem test procedures Part 2-2: Digital systems Optical eye pattern, waveform and extinction ratio measurementICS 33.180.01 BS EN 61280-2-2:2008National forewordThis British Standard is the UK implementation of EN 61280-2-2:2008. It is
2、 identical to IEC 61280-2-2:2008. It supersedes BS EN 61280-2-2:2005 which is withdrawn.The UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/3, Fibre optic systems and active devices.A list of organizations represented on this comm
3、ittee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was publ
4、ished under the authorityStrategy Committee on 30 September 2008 BSI 2008ISBN 978 0 580 57325 5Amendments/corrigenda issued since publicationDateCommentsEUROPEAN STANDARDEN 61280-2-2NORME EUROPENNEEUROPISCHE NORM August 2008 ICS 33.180.01Supersedes EN 61280-2-2:2005English versionFibre optic communi
5、cation subsystem test procedures - Part 2-2: Digital systems -Optical eye pattern, waveform and extinction ratio measurement(IEC 61280-2-2:2008)Procdures dessai des sous-systmesde tlcommunications fibres optiques - Partie 2-2: Systmes numriques - Mesure du diagramme de loeil optique,de la forme dond
6、e et du taux dextinction(CEI 61280-2-2:2008)Prfverfahren fr Lichtwellenleiter- Kommunikationsuntersysteme - Teil 2-2: Digitale Systeme - Messung des optischen Augendiagramms, der Wellenform und des Extinktionsverhltnisses (IEC 61280-2-2:2008)This European Standard was approved by CENELEC on 2008-06-
7、01. 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 bibliographical references concerning such national standards may be obtain
8、ed on application to the Central Secretariat 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 responsibility of a CENELEC member into its own language and notified to the Central
9、 Secretariat has the same status as the official versions.CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta
10、, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.CENELECEuropean Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische NormungCentral Secretari
11、at: rue de Stassart 35, B - 1050 Brussels 2008 CENELEC -All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.Ref. No. EN 61280-2-2:2008 E 5 BS EN 61280-2-2:2008ForewordThe text of document 86C/768/CDV, future edition 3 of IEC 61280-2-2, prepared by SC 86C, F
12、ibre optic systems and active devices, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61280-2-2 on 2008-06-01.This European Standard supersedes EN 61280-2-2:2005.EN 61280-2-2:2008includesthefollowingsignificanttechnicalchangeswithrespectt
13、oEN 61280-2-2:2005: the necessity of DC coupling for extinction ratio measurement is clarified; the definition of extinction ratio has been revised to better harmonize with ITU-T; the definition of OMA has been clarified. The following dates were fixed: latest date by which the EN has to be implemen
14、tedat national level by publication of an identicalnational standard or by endorsement(dop)2009-03-01 latest date by which the national standards conflicting with the EN have to be withdrawnAnnex ZA has been added by CENELEC.(dow)2011-06-01Endorsement noticeThe text of the International Standard IEC
15、 61280-2-2:2008 was approved by CENELEC as a EuropeanStandard without any modification.CONTENTS1Scope and object . 52Normative references. 53Apparatus . 53.1Time-domain optical detection system. 63.1.1Optical-to-electrical (O/E) converter . 63.1.2Resistive signal splitter (optional) . 73.1.3Linear-p
16、hase low-pass filter . 73.1.4Oscilloscope . 93.1.5Overall system response . 93.2Oscilloscope synchronization system . 93.3Pulse pattern generator . 103.4Optical power meter. 103.5Optical attenuator . 103.6Test cord . 104Test sample . 105Procedure . 115.1Method 1: Basic waveform measurement . 115.2Me
17、thod 2: Extinction measurement method using the histogram function . 116Calculation . 136.1Basic waveform measurement definitions. 136.2Method 2: Extinction measurement method using the histogram function . 166.3Eye-diagram analysis using a mask . 177Test result . 187.1Required information . 187.2Av
18、ailable information . 187.3Specification information . 19Annex A (informative) Oscilloscope synchronization system . 22Annex ZA (normative) Normative references to international publications with theircorresponding European publications . 27Bibliography . 26Figure 1 Optical eye pattern, waveform, an
19、d extinction ratio measurementconfiguration . 5Figure 2 Time-domain optical detection system .6Figure 3 Illustrations of NRZ and RZ eye-diagram parameters . 16Figure 4 Example of eye pattern measured with 0,75/T low-pass filter . 17Figure 5 Example of eye pattern measured with 3,0/T low-pass filter
20、. 18Figure 6 Eye diagram with vertical histogram data collected from the central 20 %window. 18Figure A.1 Oscilloscope synchronization system . 22Table 1 Frequency response characteristics . 9Table 2 Typical parameters for the measurement shown in Figure 4 . 20Table 3 Typical parameters for the meas
21、urement shown in Figure 5 . 21Table A.1 Example lengths of common RG-58 cable . 24FIBRE OPTIC COMMUNICATIONSUBSYSTEM TEST PROCEDURES Part 2-2: Digital systems Optical eye pattern, waveform and extinction ratio measurement1Scope and objectThe purpose of this part of IEC 61280 is to describe a test pr
22、ocedure to measure the eye pattern and waveform parameters such as rise time, fall time, overshoot, and extinction ratio. Alternatively, the waveform may be tested for compliance with a predetermined waveform mask.2Normative referencesThe following referenced documents are indispensable for the appl
23、ication 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.ITU-T Recommendation G.957, Optical interfaces for equipments and systems relating to the synchronous digital hiera
24、rchy3ApparatusThe 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.Pulse patt ernge nerato rDa ta(Clock)Op ticalint erface po in tTrigg erTim e-dom ain op tical de tectio n syste mOp tical tran sm i
25、tterTest cordOp tical att enua torTest cordO/ EconvertorLow-passfilte r OscilloscopeOp tical po we r me terIE C 1 519/ 98Figure 1 Optical eye pattern, waveform, and extinction ratio measurement configuration 7 BS EN 61280-2-2:2008The time-domain optical detection system displays the intensity of the
26、 optical waveform as a function of time. The optical detection system is comprised primarily of an optical-to-electrical (O/E) converter, a linear-phase low-pass filter and an oscilloscope. The detection system is shown in Figure 2. More complete descriptions of the equipment are listed in the follo
27、wing subclauses.Optical interface pointResistive signal splitter (optional)Low-pass filterOscilloscope verticalTriggerOptical signal inputOptical to electrical converterOptional amplifierOscilloscope synchronization signalTo synchronization system (optional)IEC 1 520/98Figure 2 Time-domain optical d
28、etection system3.1.1Optical-to-electrical (O/E) converterThe O/E converter is typically a high-speed photodiode followed by electrical amplification. The O/E converter is equipped with an appropriate optical connector to allow connection to the optical interface point, either directly or via an opti
29、cal test cord.The O/E converter (including any optional amplification following the O/E converter) shall be able to reproduce the optical waveform with sufficient fidelity to ensure a meaningful measurement. Precise specifications are precluded by the large variety of possible implementations, but g
30、eneral guidelines are as follows:a) acceptable input wavelength range, adequate to cover the intended application;b) input optical reflectance, low enough to avoid excessive back-reflection into the transmitter being measured;For example, assume that an optical transmitter is specified to tolerate 2
31、4 dB reflectance maximum. If the input reflectance of the O/E converter is 30 dB, the converter can be directly connected to the transmitter. If, however, the input reflectance of the O/E converter is 14 dB, a common value, the effective reflectance can be lowered to 24 dB (or less) by inserting eit
32、her an optical isolator or a low-reflectance attenuator of 5 dB (or more) between the transmitter and the O/E converter.c) responsivity, adequate to produce a readable display on the oscilloscope;For example, assume that a non-return-to-zero (NRZ) optical data stream with an average optical power of
33、 15 dBm is to be measured. If the sensitivity of the oscilloscope is 10 mV per division, a responsivity of 790 V/W is required in order to produce a display of 50 mV peak-to-peak (that is, five divisions peak-to-peak).d) optical noise-equivalent power, low enough to result in an accurately measurabl
34、e display on the oscilloscope;For example, assume that a non-return-to-zero (NRZ) optical data stream with an average optical power of 15 dBm is to be measured. If the effective noise bandwidth of the measurement system is 470 MHz, and if the displayed root-mean-square noise is to be less than 5 % o
35、f the eye pattern peak-to-peak height, the optical noise-equivalent power shall be145 pW Hz-1/2 or less.e) lower cut-off (3 dB) frequency, 0 Hz;DC coupling is necessary for two reasons. First, extinction ratio measurements cannot otherwise be performed. Second, if AC-coupling is used, low-frequency spectral components of the measured signal (below the lower cut-off frequency of the O/E converter) may cause significant distortion via amplitude modulation of the