1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationFibre optic interconnecting devices and passive components Basic test and measurement proceduresPart 3-28: Examinations and measurements Transient lossBS EN 61300-3-28:2012Nation
2、al forewordThis British Standard is the UK implementation of EN 61300-3-28:2012. It is identical to IEC 61300-3-28:2012. It supersedes BS EN 61300-3-28:2002 which is withdrawn.The UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/2,
3、 Fibre optic interconnecting devices and passive components.A list of organizations represented on this committee 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. Th
4、e British Standards Institution 2012Published by BSI Standards Limited 2012 ISBN 978 0 580 67457 0 ICS 33.180.20Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 3
5、1 May 2012.Amendments issued since publicationDate Text affectedBRITISH STANDARDBS EN 61300-3-28:2012EUROPEAN STANDARD EN 61300-3-28 NORME EUROPENNE EUROPISCHE NORM April 2012 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches
6、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 61300-3-28:2012 E ICS 33.180.20 Supersedes EN 61300-3-28:2002English version Fibre op
7、tic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-28: Examinations and measurements - Transient loss (IEC 61300-3-28:2012) Dispositifs dinterconnexion et composantspassifs fibres optiques - Mthodes fondamentales dessais et de mesures - Partie 3-28: E
8、xamens et mesures - Perte transitoire (CEI 61300-3-28:2012) Lichtwellenleiter -Verbindungselemente und passive Bauteile - Grundlegende Prf- und Messverfahren - Teil 3-28: Untersuchungen und Messungen - Transiente Dmpfung (IEC 61300-3-28:2012) This European Standard was approved by CENELEC on 2012-04
9、-19. 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 obta
10、ined 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 responsibility of a CENELEC member into its own language and notified t
11、o 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Lat
12、via, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 61300-3-28:2012EN 61300-3-28:2012 - 2 - Foreword The text of document 86B/3334/FDIS, future edition 2 of IEC 61300-3-28, prepare
13、d by SC 86B, “Fibre optic interconnecting devices and passive components“, of IEC TC 86, “Fibre optics“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 61300-3-28:2012. The following dates are fixed: latest date by which the document has to be implemented at national lev
14、el by publication of an identical national standard or by endorsement (dop) 2013-01-19 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2013-04-19 This document supersedes EN 61300-3-28:2002. Changes from EN 61300-3-28:2002 are to update the test m
15、ethod and to reconsider the requirements. 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. Endorsement notice The text of the Internati
16、onal Standard IEC 61300-3-28:2012 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 60793-2 NOTE Harmonized as EN 60793-2. IEC 61300-3-4 NOTE Harmonized as EN 61300
17、-3-4. BS EN 61300-3-28:2012- 3 - EN 61300-3-28:2012 Annex ZA (normative) Normative 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 applicati
18、on. For dated references, only the edition cited applies. For undated references, 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. Public
19、ation Year Title EN/HD Year IEC 60825-1 - Safety of laser products - Part 1: Equipment classification and requirements EN 60825-1 - IEC 61300-1 2011 Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 1: General and guidance EN 61300-1 2011 IEC 6
20、1300-3-1 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-1: Examinations and measurements - Visual examination EN 61300-3-1 - IEC 61300-3-35 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedu
21、res - Part 3-35: Examinations and measurements - Fibre optic cylindrical connector endface visual and automated inspection EN 61300-3-35 - BS EN 61300-3-28:2012 2 61300-3-28 IEC:2012 CONTENTS 1 Scope . 5 2 Normative references . 5 3 Precautions 5 4 Apparatus . 6 4.1 General description . 6 4.2 Launc
22、h conditions and source (S) . 6 4.3 Optical detector (D) . 7 4.4 Data acquisition system (DAS) 8 4.5 Temporary joint (TJ) 8 4.6 Fibre . 8 4.7 Mode filter (mf) 8 5 Procedure 9 5.1 Pre-conditioning 9 5.2 Visual inspection . 9 5.3 Transient loss measurements 9 6 Details to be specified 11 Annex A (info
23、rmative) Minimum characteristics for analogue-to-digital converter . 12 Bibliography 13 Figure 1 Transient loss measurement set-up 6 Figure 2 Transient loss measurement 10 Figure 3 Example of a transient loss measurement with oscilloscope . 10 Figure A.1 Typical apparatus for measurement 12 Table 1
24、Preferred source . 7 Table 2 Preferred optical detector parameters . 7 BS EN 61300-3-28:201261300-3-28 IEC:2012 5 FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS BASIC TEST AND MEASUREMENT PROCEDURES Part 3-28: Examinations and measurements Transient loss 1 Scope This part of IEC 61300 de
25、scribes methods to measure fast variation of attenuation due to mechanical stresses applied on optical fibres and passive optical components during their lifetime. Transient loss measurement shows the effect of fast mechanical disturbances on fibres. These disturbances can be due to several types of
26、 action on the device under test (DUT), such as: dropping, vibration, bumping or manipulation of the fibres. Therefore this measurement will usually be performed on devices exposed to mechanical tests. This method is not designed to measure very fast transient losses (with duration less than 1 ms) t
27、hat could affect the performance of transmission systems. It is optimised to detect transient losses caused by mechanical stresses due to the tests prescribed in the component performance standards, whose duration is generally longer than several tens of milliseconds. 2 Normative references The foll
28、owing 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, the latest edition of the referenced document (including any amendments) applies. IEC 61300-1:201
29、1, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 1: General and guidance IEC 61300-3-1, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-1: Examinations and measurements Visual examination
30、IEC 61300-3-35, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-35: Examinations and measurements Fibre optic connector endface visual and automatic inspection IEC 60825-1, Safety of laser products Part 1: Equipment classification and requireme
31、nts 3 Precautions The power in the fibre shall not be at a level high enough to generate non-linear scattering effects. The position of the fibres between the measurement equipment and the DUT should be fixed during the measurements to avoid changes in attenuation due to bending loss. The safety rec
32、ommendations in IEC 60825-1 shall be followed. BS EN 61300-3-28:2012 6 61300-3-28 IEC:2012 4 Apparatus 4.1 General description The test equipment requires a fast optical detector with an analogue electrical output in order to detect loss variations of duration in the range from the millisecond to se
33、veral seconds. In cases where transient losses less than 0,5 ms need to be measured the equipment must be able to sample at twice the expected transient speed / frequency. The measurement set-up is shown in Figure 1. mf TJ DUT S D mf DAS IEC 217/12 Key S Source TJ Temporary joint DUT Device Under Te
34、st D Optical detector DAS Data acquisition system mf Mode filter Figure 1 Transient loss measurement set-up 4.2 Launch conditions and source (S) The launch condition shall be specified in accordance with Clause 9 of IEC 61300-1:2011. The source unit consists of an optical emitter, the associated dri
35、ve electronics and fibre pigtail (if any). Preferred source conditions are given in Table 1. Preferably unpolarized light shall be used. The optical source shall be continuous wave (CW) or shall have a high frequency modulation in order to detect transient losses of 0,5 ms. BS EN 61300-3-28:20126130
36、0-3-28 IEC:2012 7 Table 1 Preferred source No. Type Centre wavelength Nm Source type S1 Multi-mode 660 30 LED S2 Multi-mode 740 30 LED S3 Multi-mode 850 30 Monochromator or LED S4 Multi-mode 1 300 30 Monochromator or LED S5 Single-mode 1 310 30 Laser diode, monochromator or LED S6 Single-mode 1 550
37、30 Laser diode, monochromator or LED S7 Single-mode 1 625 30 Laser diode, monochromator or LED NOTE 1 It is recognized that CWDM and DWDM components may require the use of other source types such as tuneable lasers. It is therefore recommended in these cases that the preferred source characteristics
38、 are specified on the basis of the component to be measured. NOTE 2 The modal launch condition for 660 nm is not defined yet. The stability of the source at 23 C shall be 0,01 dB over the duration of the measurement. The source output power shall be 20 dB above the minimum measured power level. 4.3
39、Optical detector (D) The power-meter unit consists of an optical detector, the mechanism for connecting to it and associated detection electronics. The connection to the optical detector will either be with an adaptor that accepts a bare fibre or a connector plug of the appropriate design. The measu
40、rement system shall be stable within specified limits over the period of time required to make the measurements. The precise characteristics of the detector shall be compatible with the measurement requirements. The dynamic range of the optical detector shall be capable of measuring the power level
41、exiting from the DUT at the wavelength being measured. Moreover the optical detector shall have a bandwidth at least of 2 kHz (in order to detect transient loss of 0,5 ms) and an electrical output to the data acquisition system (DAS). The preferred optical detector parameters are given in Table 2. T
42、able 2 Preferred optical detector parameters Number Type Non linearity dB Accuracy D1 Multi-mode 0,25 (over 5 dBm to 60 dBm) 5 % D2 Single-mode 0,01 (Attenuation Attenuation 10 dB) 5 % In order to ensure that all light exiting the fibre is detected by the optical detector, the sensitive area of the
43、detector and the relative position between it and the fibre should be compatible with the numerical aperture of the fibre. BS EN 61300-3-28:2012 8 61300-3-28 IEC:2012 The measurement stability of the complete set-up shall be better than 0,05 dB over the measurement time and operational temperature r
44、ange. 4.4 Data acquisition system (DAS) A fast data acquisition system connected to the analogue electric output of the optical detector, is used to record the transient loss variation acquired by the optical detector. The DAS shall be able to store the data with the same acquisition frequency as th
45、e analogue electric output of the optical detector in order to display and to detect its variation with time. A simple DAS could be realised using an oscilloscope capable of memorising the level received from the analogue electric output of the optical detector when it exceeds the trigger threshold.
46、 This method requires the use of a sensitivity factor to convert the amplitude in Volts into a power level, written in dB. A more practical DAS is an analogue-to-digital converter connected to a personal computer. The analogue-to-digital converter shall have a sufficient dynamic range (16 bits minim
47、um, 24 bits is recommended to achieve a 0,001 dB resolution with most commercially available optical detector) and shall have a sampling speed of at least 4 000 measurements per second (see Annex A for more information). The settings of the analogue-to-digital converter shall be made in such a way t
48、hat the full output range of the analogue electrical output of the optical detector can be covered. In general, conversion to dB values is simultaneously made by the personal computer while the measurements are taking place. To avoid the storage of a huge amount of data points, the personal computer
49、 only needs to store one measurement per second when the trigger threshold is not exceeded. Once the threshold level is exceeded, all data points during the event as well as all data points of 1 second before and after the event shall be stored (at a rate of at least 4 000 measurements/second). In case the signal does not return to its original level again, a maximum acquisition time can be added to avoid the storage of an excessive amount of data.
