1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI British StandardsWB9423_BSI_StandardColCov_noK_AW:BSI FRONT COVERS 5/9/08 12:55 Page 1Fibre optic interconnectingdevices and passive components Basic test and measurementprocedures Part 3-3: Examinat
2、ions and measurements Activemonitoring of changes in attenuation and return lossBS EN 61300-3-3:2009National forewordThis British Standard is the UK implementation of EN 61300-3-3:2009. It isidentical to IEC 61300-3-3:2009. It supersedes BS EN 61300-3-3:2003 whichis withdrawn.The UK participation in
3、 its preparation was entrusted by Technical CommitteeGEL/86, Fibre optics, to Subcommittee GEL/86/2, Fibre optic interconnectingdevices and passive components.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include
4、 all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2009ISBN 978 0 580 60772 1ICS 33.180.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of the StandardsPolicy and
5、 Strategy Committee on 31 May 2009Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 61300-3-3:2009EUROPEAN STANDARD EN 61300-3-3 NORME EUROPENNE EUROPISCHE NORM May 2009 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation E
6、lectrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: avenue Marnix 17, B - 1000 Brussels 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61300-3-3:2009 E ICS 33.180.20 Supersedes EN 61300-3-3:
7、2003English version Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-3: Examinations and measurements - Active monitoring of changes in attenuation and return loss (IEC 61300-3-3:2009) Dispositifs dinterconnexion et composants passifs fibres
8、 optiques - Mthodes fondamentales dessais et de mesures - Partie 3-3: Examens et mesures - Contrle actif des variations de laffaiblissement et du facteur dadaptation (CEI 61300-3-3:2009) Lichtwellenleiter -Verbindungselemente und passive Bauteile - Grundlegende Prf- und Messverfahren - Teil 3-3: Unt
9、ersuchungen und Messungen - Aufzeichnung der nderung von Dmpfung und Rckflussdmpfung (IEC 61300-3-3:2009) This European Standard was approved by CENELEC on 2009-04-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Europea
10、n Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (Englis
11、h, 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 Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Be
12、lgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 61
13、300-3-3:2009EN 61300-3-3:2009 2 Foreword The text of document 86B/2808/FDIS, future edition 3 of IEC 61300-3-3, prepared 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 was approved by CENELEC as EN
14、 61300-3-3 on 2009-04-01. This European Standard supersedes EN 61300-3-3:2003. The change with respect to EN 61300-3-3:2003 is the structure of the document. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national st
15、andard or by endorsement (dop) 2010-01-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2010-04-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 61300-3-3:2009 was approved by CENELEC as a European
16、 Standard without any modification. _ BS EN 61300-3-3:2009 3 EN 61300-3-3:2009 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following referenced documents are indispensable for the application of this document. For dated r
17、eferences, 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. Publication Year Titl
18、e EN/HD Year IEC 61300-1 - 1)Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 1: General and guidance EN 61300-1 2003 2)IEC 61300-3-1 - 1)Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part
19、 3-1: Examinations and measurements - Visual examination EN 61300-3-1 2005 2)IEC 61300-3-6 - 1)Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-6: Examinations and measurements - Return loss EN 61300-3-6 2009 2)IEC 61300-3-35 200X 3)Fibre op
20、tic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-35: Examinations and measurements - Fibre optic cylindrical connector endface visual and automated inspection - - 1)Undated reference. 2)Valid edition at date of issue. 3)To be published. BS EN 61300-
21、3-3:2009 2 61300-3-3 IEC:2009(E) CONTENTS 1 Scope.6 2 Normative references .6 3 General description 6 3.1 Test method 6 3.2 Precautions .7 4 Apparatus.7 4.1 Methods 1, 2 and 37 4.1.1 General .7 4.1.2 Source (S).7 4.1.3 Launch condition (E)8 4.1.4 Monitoring equipment 8 4.1.5 Detector D.9 4.1.6 Stres
22、s fixture .9 4.1.7 Branching device BD .9 4.1.8 Temporary joints9 4.1.9 Data acquisition.9 4.1.10 Monitor sample9 4.1.11 Reference fibre10 4.2 Methods 4 and 511 4.2.1 General .11 4.2.2 OTDR11 4.2.3 Buffer fibre 11 4.2.4 Optical switches 11 5 Procedure 13 5.1 Monitoring attenuation and return loss of
23、 a single sample method 1 .13 5.1.1 General .13 5.1.2 Attenuation monitoring method 1 13 5.1.3 Return loss monitoring method 1 14 5.2 Monitoring attenuation and return loss of multiple samples using a 1 N branching device method 2.14 5.2.1 General .14 5.2.2 Attenuation monitoring method 2 14 5.2.3 R
24、eturn loss monitoring method 2 14 5.3 Monitoring attenuation and return loss of multiple samples using two 1 N optical switches method 3 14 5.3.1 General .14 5.3.2 Attenuation method 314 5.3.3 Return loss method 315 5.4 Bidirectional OTDR monitoring of attenuation and return loss of multiple samples
25、 method 4 16 5.4.1 General .16 5.4.2 Attenuation method 416 5.4.3 Return loss method 418 5.5 Unidirectional OTDR monitoring of attenuation and return loss of multiple samples method 5 19 6 Details to be specified 19 BS EN 61300-3-3:200961300-3-3 IEC:2009(E) 3 6.1 Method 1 .19 6.2 Methods 2 and 320 6
26、3 Methods 4 and 520 Figure 1 Method 1 Monitoring attenuation and return loss of a single sample undergoing stress testing10 Figure 2 Method 2 Monitoring attenuation and return loss of multiple samples using a 1 N branching device .10 Figure 3 Method 3 Monitoring attenuation and return loss of multi
27、ple samples using two 1 N optical switches .11 Figure 4 Method 4 Bidirectional OTDR monitoring of attenuation and return loss of multiple samples.12 Figure 5 Method 5 Unidirectional OTDR monitoring of attenuation and return loss of multiple samples.13 Figure 6 Cut-back measurement location (transmis
28、sion) 15 Figure 7 Typical OTDR trace caused by the reflection from a DUT.17 Figure 8 Cut-back measurement location (OTDR) 18 Table 1 Example values for Rayleigh backscatter coefficient19 BS EN 61300-3-3:2009 6 61300-3-3 IEC:2009(E) FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS BASIC TES
29、T AND MEASUREMENT PROCEDURES Part 3-3: Examinations and measurements Active monitoring of changes in attenuation and return loss 1 Scope This part of IEC 61300 describes the procedure to monitor changes in attenuation and/or return loss of a component or an interconnecting device, when subjected to
30、an environmental or mechanical test. Such a procedure is commonly referred to as active monitoring. In many instances, it is more efficient to monitor attenuation and return loss at the same time. The procedure may be applied to measurements on single samples or to simultaneous measurements on multi
31、ple samples, both at single wavelengths and multiple wavelengths, by using branching devices and/or switches as appropriate. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For und
32、ated references, the latest edition of the referenced document (including any amendments) applies. IEC 61300-1, 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
33、 components Basic test and measurement procedures Part 3-1: Examinations and measurements Visual examination IEC 61300-3-6, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-6: Examinations and measurements Return loss IEC 61300-3-35, Fibre optic
34、 interconnecting devices and passive components Basic test and measurement procedures Part 3-35: Examinations and measurements Fibre optic cylindrical connector endface visual and automated inspection13 General description 3.1 Test method The procedure describes a number of active monitoring measure
35、ment methods. Method 1 describes the situation where a single sample is subject to mechanical or environmental stress testing. Methods 2 and 3 describe methods for monitoring changes in the optical performance of multiple samples. Methods 4 and 5 measure changes in the optical performance of samples
36、 using an OTDR. Methods 4 and 5 may be used only when the OTDR averaging time is much less than the variation time of the test conditions. Where there is any form of uncertainty over the measurement method used, method 1 shall be considered to be the reference method. 1To be published. BS EN 61300-3
37、3:200961300-3-3 IEC:2009(E) 7 All methods are capable of being configured to monitor changes in attenuation and return loss at the same time. The required optical test parameters shall be defined in the relevant specification. Where a group of samples is being monitored over a period of time, say s
38、everal days or weeks, it is usual to employ some form of automated data acquisition. Also, since the changes in optical performance can be very small, it is important to ensure high measurement stability over time. 3.2 Precautions The following requirements shall be met. a) Precautions shall be take
39、n to ensure that cladding modes do not affect the measurement. b) Precautions shall be taken to prevent movement in the position of the fibre cables between the sample(s) and the test apparatus, to avoid changes in optical performance caused by bending losses. c) The stability performance of the tes
40、t equipment shall be 0,05 dB or 10 % of the attenuation to be measured, whichever is the lower value. The stability shall be maintained over the measurement time. The required measurement resolution shall be 0,01 dB for both multimode and single-mode. d) To achieve consistent results, clean and insp
41、ect all samples prior to measurement in accordance with the manufacturers instructions. Visual examination shall be undertaken in accordance with IEC 61300-3-1 and IEC 61300-3-35. e) The power in the fibre shall be at a level that does not generate non-linear scattering effects (typically 10 dB, the
42、 following approximation for return loss may be used. RLi,t Pi,t Gi(5) The constant Giis evaluated using measurements made with the fibre from channel “i” of switch 1 terminated with a reference return loss. The reference return loss is a length of fibre one end of which is terminated with a known r
43、eturn loss. Gi= Pi,r S + 10 log (1 10 P/10) (6) where S is the reference return loss, in decibels (dB); Pi,sis the normalized power in channel “i” terminated with reference return loss S, in decibels (dB); P = Pi,s Pi,o(7) where Pi,ois the normalized reflected power with a high attenuation in the fi
44、bre using, for example, a mandrel wrap between the reference return loss S and SW1. 5.4 Bidirectional OTDR monitoring of attenuation and return loss of multiple samples method 4 5.4.1 General Due to the complexity of the test set-up, it is typical for the various parts of the apparatus, including th
45、e OTDR, to be computer-controlled. This control ensures that the 1 N switches are stepped synchronously and that the sources are switched at the appropriate time to make the necessary number of measurements. The control also ensures that the sequence is repeated periodically as defined in the releva
46、nt specification for the duration of the stress test. 5.4.2 Attenuation method 4 A measurement of attenuation of the DUT in channel “i” at time “t” is carried out as follows: iti,ti,ti,2JXrXfL += (8) where BS EN 61300-3-3:200961300-3-3 IEC:2009(E) 17 Xfi,tis the change in power in the OTDR display f
47、or the component under test with switch 1 set on channel “i”; Xri,tis the same as Xf i,texcept that switch 2 is set on channel “i”, and switch 1 is set on channel “rev”; Jiis a constant for channel “i”. The values of Xf and Xr are values of loss as seen in both the forward and reverse directions of
48、transmission plus loss in the temporary joints (see Figure 7). HDistance OTDR Signal dBXf, XrIEC 028/03 Figure 7 Typical OTDR trace caused by the reflection from a DUT NOTE Since this is a monitoring experiment, only the change in attenuation is considered significant. Thus the change in Li,tfrom th
49、e initial measurement is the important factor, rather than the absolute value of Li,tThe constant Jiis determined with a cut-back measurement made at the completion of the test sequence. The sequence of measurements in the determination of Jiis, first, to make the measurements Xfi,cand Xri,c, replace the OTDR with a dual-wavelength source, make cut-back measurement A
