1、BSI Standards PublicationFibre optic interconnecting devices and passive components Basic test and measurement proceduresPart 2-43: Tests Screen testing of return loss of single-mode PC opticalfibre connectorsBS EN 61300-2-43:2014National forewordThis British Standard is the UK implementation of EN
2、61300-2-43:2014. It isidentical to IEC 61300-2-43:2014. It supersedes BS EN 61300-2-43:2000which is withdrawn.The UK participation in its preparation was entrusted by TechnicalCommittee GEL/86, Fibre optics, to Subcommittee GEL/86/2, Fibre opticinterconnecting devices and passive components.A list o
3、f organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2014.Published by BSI Standards Limite
4、d 2014ISBN 978 0 580 80875 3ICS 33.180.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 September 2014.Amendments/corrigenda issued since publicationDate Text
5、affectedBRITISH STANDARDBS EN 61300-2-43:2014EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 61300-2-43 September 2014 ICS 33.180.20 Supersedes EN 61300-2-43:1999 English Version Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 2-43: Tests -
6、 Screen testing of return loss of single-mode PC optical fibre connectors (IEC 61300-2-43:2014) Dispositifs dinterconnexion et composants passifs fibresoptiques - Procdures fondamentales dessais et demesures - Partie 2-43: Essais - Slection des connecteurs PC pour fibres optiques unimodales en fonct
7、ion de leuraffaiblissement de rflexion (CEI 61300-2-43:2014) Lichtwellenleiter - Verbindungselemente und passiveBauteile -Grundlegende Prf- und Messverfahren - Teil 2-43: Prfungen - Verfahren zur Sortierprfung vonEinmoden-PC-LWL-Steckverbindern in Abhngigkeit von der Rckflussdmpfung (IEC 61300-2-43:
8、2014) This European Standard was approved by CENELEC on 2014-07-24. 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 bibliograp
9、hical 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 responsi
10、bility 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,
11、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. European Committee for Electrotec
12、hnical Standardization Comit Europen de Normalisation ElectrotechniqueEuropisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No
13、. EN 61300-2-43:2014 E EN 61300-2-43:2014 - 2 - Foreword The text of document 86B/3669/CDV, future edition 2 of IEC 61300-2-43, 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 approved by C
14、ENELEC as EN 61300-2-43:2014. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2015-04-24 latest date by which the national standards conflicting with the document have to
15、 be withdrawn (dow) 2015-07-24 This document supersedes EN 61300-2-43:1999. 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. Endorsemen
16、t notice The text of the International Standard IEC 61300-2-43:2014 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following note has to be added for the standard indicated : IEC 61300-1 NOTE Harmonized as EN 61300-1. BS EN 613
17、00-2-43:2014- 3 - EN 61300-2-43:2014 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 application. For dated r
18、eferences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. NOTE 2 Up-to-date i
19、nformation on the latest versions of the European Standards listed in this annex is available here: www.cenelec.eu. Publication Year Title EN/HD Year IEC 61300-3-6 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-6: Examinations and measur
20、ements - Return loss EN 61300-3-6 - BS EN 61300-2-43:2014 2 IEC 61300-2-43:2014 IEC 2014 CONTENTS 1 Scope 5 2 Normative references 5 3 General description . 5 4 Apparatus 5 5 Procedure 6 5.1 Selection of the reflection standard cord . 6 5.2 Cord screen testing . 6 5.3 Pigtail cord screen testing . 6
21、 6 Details to be specified . 7 Annex A (informative) Screen testing of return loss of pigtails having PC fibre optic connector 8 Bibliography 13 Figure 1 Measurement set-up for open plug reflection standard . 6 Figure 2 Measurement set-up for mated reflection standard cords . 6 Figure 3 Measurement
22、set-up for cord screen testing . 6 Figure 4 Measurement set-up for pigtail cord screen testing 7 Figure A.1 Measurement set-up of the screen test method . 9 Figure A.2 Relationship between null and . 10 Figure A.3 Cumulative probability of return loss before test 11 Figure A.4 Cumulative probability
23、 of return loss after test 11 Figure A.5 Relationship between power and . 12 Figure A.6 Measurement set-up of the reflected powers . 12 BS EN 61300-2-43:2014IEC 61300-2-43:2014 IEC 2014 5 FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS BASIC TEST AND MEASUREMENT PROCEDURES Part 2-43: Test
24、s Screen testing of return loss of single-mode PC optical fibre connectors 1 Scope This part of IEC 61300 aims at screening single-mode physical contact (PC) optical fibre connectors of an optical fibre cord or an optical fibre pigtail in terms of return loss, thus ensuring minimum return loss when
25、the connectors, which have been screen tested by this method, are randomly mated with each other in the field. 2 Normative references 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 ed
26、ition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 61300-3-6, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-6: Examinations and measurements Return loss 3 General
27、 description The domed ferrule end faces of PC connectors (not angled) are produced by a polishing process. This polishing process results in a thin damaged layer at the fibre end face of the connector. In silica fibres, the refractive index of the damaged layer is slightly higher than that of origi
28、nal fibre. This high refractive index layer generates optical reflection. When PC connectors are mated, return loss occurs as a result of multiple reflections at the two damaged layers of the butted connectors. This test procedure ensures that a designed minimum return loss is achieved when PC conne
29、ctors are randomly mated. It screens cords or pigtails by using a pair of reflection standard plug (RP) cords. The pair of reflection standard plugs is selected on the condition that the return loss when the plugs are mated is several decibels better than the designed minimum return loss. Cords whic
30、h pass this test will achieve the designed minimum return loss in over 99 % of cases when randomly mated (see Annex A). 4 Apparatus The equipment listed below shall be chosen according to the method used to measure the connector return loss, in accordance with IEC 61300-3-6. The reflection standard
31、plug shall be prepared according to the procedure given in 5.1. Sources S Excitation unit E Detector D Temporary joint TJ Terminator T Branching device BD Reflection standard cord BS EN 61300-2-43:2014 6 IEC 61300-2-43:2014 IEC 2014 The reflection standard cord has a reflection standard plug (RP) at
32、 one end. The other end of the reflection standard cord is an end or a plug whose return loss is better than the designed minimum return loss Lrs(in decibels). 5 Procedure 5.1 Selection of the reflection standard cord The reflection standard plug (RP) shall be selected by the following procedure. a)
33、 Set up an objective reflection standard cord as shown in Figure 1. Figure 1 Measurement set-up for open plug reflection standard b) Set the detector to 14,7 dB as the Fresnel reflection between the air and the silica fibre core as shown in Figure 1. The refractive index of air is 1,0, and the one o
34、f silica fibre is 1,452 for single-mode fibre on condition = 0,3 %, = 1,31 m. NOTE Measurement accuracy can be improved by using the actual parameters of fibres which have been employed. c) Connect another objective reflection standard cord as shown in Figure 2, then measure the return loss. Figure
35、2 Measurement set-up for mated reflection standard cords d) Take the pair of objective reflection standard cords as reflection standard cords on condition that their return loss from the mating point is Lrs+ (in decibels), where Lrsis a designed minimum return loss. The value of shall be set at abov
36、e 2 dB. 5.2 Cord screen testing a) Connect the device under test (DUT) (cord) between the reflection standard plugs as shown in Figure 3. Figure 3 Measurement set-up for cord screen testing b) Measure the return loss Lr (in decibels) from the two PC mating points. c) Consider the objective cord as a
37、 screen tested cord when Lris greater than Lrs. 5.3 Pigtail cord screen testing a) Connect the objective PC connector of DUT (pigtail cord) to one reflection standard plug as shown in Figure 4, and terminate pigtail fibre end. IEC 2022/14 14,7 dB TJ RP D BD E S IEC 2023/14 TJ Lrs+ (in decibels) RP D
38、 BD E S RP T T IEC 2024/14 TJ Lr(in decibels) RP D BD E S RP T T DUT BS EN 61300-2-43:2014IEC 61300-2-43:2014 IEC 2014 7 Figure 4 Measurement set-up for pigtail cord screen testing b) Measure the return loss Lr (in decibels) from the mating point. c) Pass the objective pigtail cord as a screen teste
39、d cord when Lr is greater than Lrs+ (in decibels). The value of shall be set at above 0,6 dB and at less than 5 dB. 6 Details to be specified The following details, as applicable, shall be specified in the relevant specification: minimum return loss Lrs (in decibels); condition of standard reflectio
40、n plugs (the value of in decibels); screening condition for pigtail cords (the value of in decibels); attenuation of mating points between the reflection standard connectors and the objective connectors; measurement uncertainty. IEC 2025/14 TJ RP D BD E S T T DUT Lrs+ (in decibels) BS EN 61300-2-43:
41、2014 8 IEC 61300-2-43:2014 IEC 2014 Annex A (informative) Screen testing of return loss of pigtails having PC fibre optic connector This annex describes the theoretical background of the screen testing of return loss for pigtails. The basic idea is the same as the screen testing of return loss of co
42、rds having PC fibre optic connectors: select a pair of reference connectors, and a measurement pigtail is screen tested using the reference connector under a condition which is determined by simulation, where the distribution of high refractive index layer caused by polishing process is considered.
43、Two parameters and are introduced into this method. Parameter is used for the selection of a pair of reference connectors. Parameter is used as a criterion for screen testing measurement connectors. These two parameters and are carefully determined by simulation so that return loss of mating point e
44、xceeds certain specified return loss Lrs with high probability when the screen tested connectors are randomly connected. The method assumes: refractive index of fibre core n1is 1,452; refractive index of air n2is 1,0. The set-up of the measurement and test procedures will be shown first. Figure A.1
45、shows the set-up with the reference cords 1 and 2; 1a and 2a represent reference connectors. Points 3a and 3b are the connectors of the cord under test and 4a is the connector of the pigtail under test. The connectors represented by 1b and 2b and 5b are angled connectors with high return loss. S is
46、the optical source, D is the optical detector and BD represents the optical coupler. T is a fibre termination which shall have a high return loss; it should be made by the application of an index matching material to the fibre end or introducing an high attenuation in the fibre, for example, with a
47、mandrel wrap. BS EN 61300-2-43:2014IEC 61300-2-43:2014 IEC 2014 9 Figure A.1 Measurement set-up of the screen test method P0 is the input power and P8, P1, P2 and P3 are the reflected powers. The symbols , , , indicate connection conditions. The procedure of the screen test method is as follows: a)
48、A pair of reference plugs is selected. Connect the connector 1b to the connector 5b, then measure the power P8 (see in Figure A.1). Connect the reference connector 2a to the reference connector 1a, then measure the power P1 (see in Figure A.1). The condition of selection is given by: Lrs 10 log P1/P
49、0 Lrs+ (dB) (A.1) The measured power P0 can be described using P8, n1and n2as follows: 10 log 1/P0 = 10 log 1/P8 20 log (n1 n2) / (n1+ n2) (A.2) The second term of the right side represents Fresnel reflection of air, and equals 14,7 dB. Therefore Equation (A.1) can be rewritten as: 0 10 log P1/P8 + 14,7 Lrs (A.3) b) The cord under test is screen tested using the pair of refe
