1、BSI Standards PublicationFibre-optic communication subsystem test proceduresPart 4-2: Installed cable plant Single-mode attenuation and optical return loss measurementBS EN 61280-4-2:2014National forewordThis British Standard is the UK implementation of EN 61280-4-2:2014. It is identical to IEC 6128
2、0-4-2:2014. It supersedes BS EN 61280-4-2:2000 which is withdrawn.The UK participation in its preparation was entrusted by TechnicalCommittee GEL/86, Fibre optics, to Subcommittee GEL/86/3, Fibre optic systems and active devices.A list of organizations represented on this committee can be obtained o
3、nrequest 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 Limited 2014ISBN 978 0 580 74105 0ICS 33.180.01Compliance with a Brit
4、ish Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 October 2014.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 61280-4-2:2014EUROPEAN STANDARDNORM
5、E EUROPENNEEUROPISCHE NORMEN 61280-4-2 September 2014 ICS 33.180.01 Supersedes EN 61280-4-2:1999 English Version Fibre-optic communication subsystem test procedures - Part 4-2: Installed cable plant - Single-mode attenuation and optical return loss measurement (IEC 61280-4-2:2014) Procdures dessai d
6、es sous-systmes detlcommunication fibres optiques - Partie 4-2:Installations cbles - Mesure de laffaiblissement derflexion optique et de laffaiblissement des fibres unimodales (CEI 61280-4-2:2014) Prfverfahren fr Lichtwellenleiter-Kommunikationsuntersysteme - Teil 4-2: InstallierteKabelanlagen - Ein
7、moden-Dmpfungs- und optischeRckflussdmpfungsmessung (IEC 61280-4-2:2014) This European Standard was approved by CENELEC on 2014-08-01. 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 nation
8、al standard without any alteration. Up-to-date lists and bibliographical 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 v
9、ersion in any other language made by translation under the responsibility 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, Bulgari
10、a, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, 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, Switzerlan
11、d,Turkey and the United Kingdom. European Committee for Electrotechnical 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 for
12、m and by any means reserved worldwide for CENELEC Members. Ref. No. EN 61280-4-2:2014 E EN 61280-4-2:2014 - 2 - Foreword The text of document 86C/1238/FDIS, future edition 2 of IEC 61280-4-2, prepared by SC 86C, “Fibre optic systems and active devices“, of IEC TC 86, “Fibre optics“ was submitted to
13、the IEC-CENELEC parallel vote and approved by CENELEC as EN 61280-4-2:2014. 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) 2015-05-01 latest date by which the national s
14、tandards conflicting with the document have to be withdrawn (dow) 2017-08-01 This document supersedes EN 61280-4-2:1999. 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 identify
15、ing any or all such patent rights. Endorsement notice The text of the International Standard IEC 61280-4-2:2014 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 60
16、793-1-40 NOTE Harmonized as EN 60793-1-40. IEC 60793-2 NOTE Harmonized as EN 60793-2. IEC 61280-1-3 NOTE Harmonized as EN 61280-1-3. IEC 61753-1 NOTE Harmonized as EN 61753-1. IEC 61755-2-1 NOTE Harmonized as EN 61755-2-1. IEC 61755-2-2 NOTE Harmonized as EN 61755-2-2. IEC 61755-2-4 NOTE Harmonized
17、as EN 61755-2-41). IEC 61755-2-5 NOTE Harmonized as EN 61755-2-51). 1)To be published. BS EN 61280-4-2:2014- 3 - EN 61280-4-2:2014 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents, in whole or in part, are
18、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. NOTE 1 When an International Publication has been modifie
19、d by common modifications, indicated by (mod), the relevant EN/HD applies. NOTE 2 Up-to-date information 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 60793-2-50 - Optical fibres - Part 2-50: Product spe
20、cifications - Sectional specification for class B single-mode fibres EN 60793-2-50 - IEC 60825-2 - Safety of laser products - Part 2: Safety of optical fibre communication systems (OFCS) EN 60825-2 - IEC 60874-14-2 - Connectors for optical fibres and cables - Part 14-2: Detail specification for fibr
21、e optic connector type SC-PC tuned terminated to single-mode fibre type B1 - - IEC 61300-3-6 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-6: Examinations and measurements - Return loss EN 61300-3-6 - IEC 61300-3-35 - Fibre optic interc
22、onnecting devices and passive components - Basic test and measurement procedures - Part 3-35: Examinations and measurements - Visual inspection of fibre optic connectors and fibre-stub transceivers EN 61300-3-35 - IEC 61315 - Calibration of fibre-optic power meters EN 61315 - IEC 61746-1 2009 Calibr
23、ation of Optical Time-Domain Reflectometers (OTDR) - Part 1: OTDR for single-mode fibres EN 61746-1 2011 IEC/TR 62627-01 - Fibre optic interconnecting devices and passive components - Part 01: Fibre optic connector cleaning methods - - BS EN 61280-4-2:2014 2 IEC 61280-4-2:2014 IEC 2014 CONTENTS INTR
24、ODUCTION . 9 1 Scope 10 2 Normative references 10 3 Terms, definitions, graphical symbols and abbreviations 11 3.1 Terms and definitions 11 3.2 Graphical symbols 13 3.3 Abbreviations 14 4 Measurement methods 15 4.1 General . 15 4.2 Cabling configurations and applicable test methods 16 Cabling config
25、urations and applicable test methods for attenuation 4.2.1measurements . 16 Cabling configurations and applicable test methods for optical return 4.2.2loss measurements 18 4.3 Overview of uncertainties 18 General . 18 4.3.1Test cords . 18 4.3.2Reflections from other interfaces . 18 4.3.3Optical sour
26、ce . 18 4.3.4Output power reference . 19 4.3.5Received power reference . 19 4.3.6Mode field diameter variation . 19 4.3.7Bi-directional measurements 19 4.3.85 Apparatus 19 5.1 General . 19 5.2 Light source 19 Stability . 19 5.2.1Spectral characteristics . 20 5.2.2Launch cord . 20 5.2.35.3 Receive or
27、 tail cord . 20 5.4 Substitution cord . 21 5.5 Power meter LSPM methods only. 21 5.6 OTDR apparatus . 21 5.7 Return loss test set . 22 5.8 Connector end-face cleaning and inspection equipment 22 5.9 Adapters . 22 6 Procedures 22 6.1 General . 22 6.2 Common procedures . 23 Care of the test cords 23 6
28、.2.1Make reference measurements (LSPM and OCWR methods only) . 23 6.2.2Inspect and clean the ends of the fibres in the cabling . 23 6.2.3Make the measurements 23 6.2.4Make the calculations 23 6.2.56.3 Calibration 23 BS EN 61280-4-2:2014IEC 61280-4-2:2014 IEC 2014 3 6.4 Safety . 24 7 Calculations . 2
29、4 8 Documentation 24 8.1 Information for each test . 24 8.2 Information to be made available 24 Annex A (normative) One-cord reference method . 25 A.1 Applicability of test method . 25 A.2 Apparatus . 25 A.3 Procedure . 25 A.4 Calculation 26 A.5 Components of reported attenuation . 26 Annex B (norma
30、tive) Three-cord reference method 27 B.1 Applicability of test method . 27 B.2 Apparatus . 27 B.3 Procedure . 27 B.4 Calculations 28 B.5 Components of reported attenuation . 28 Annex C (normative) Two-cord reference method 29 C.1 Applicability of test method . 29 C.2 Apparatus . 29 C.3 Procedure . 2
31、9 C.4 Calculations 31 C.5 Components of reported attenuation . 31 Annex D (normative) Optical time domain reflectometer . 32 D.1 Applicability of test method . 32 D.2 Apparatus . 32 D.2.1 General . 32 D.2.2 OTDR 32 D.2.3 Test cords . 32 D.3 Procedure (test method) . 33 D.4 Calculation of attenuation
32、 . 34 D.4.1 General . 34 D.4.2 Connection location . 34 D.4.3 Definition of the power levels F1and F235 D.4.4 Alternative calculation 36 D.5 Calculation of optical return loss . 37 D.6 Calculation of reflectance for discrete components . 39 D.7 OTDR uncertainties 40 Annex E (normative) Continuous wa
33、ve optical return loss measurement Method A . 41 E.1 Applicability of test method . 41 E.2 Apparatus . 41 E.2.1 General . 41 E.2.2 Light source . 41 E.2.3 Branching device or coupler 41 E.2.4 Power meters 42 E.2.5 Connector interface . 42 E.2.6 Low reflection termination 42 E.3 Procedure . 42 BS EN
34、61280-4-2:2014 4 IEC 61280-4-2:2014 IEC 2014 E.3.1 Test set characterization 42 E.3.2 Measurement procedure 44 E.3.3 Calculations . 44 E.3.4 Measurement uncertainty. 45 Annex F (normative) Continuous wave optical return loss measurement Method B 46 F.1 Applicability of test method . 46 F.2 Apparatus
35、 . 46 F.2.1 General requirements 46 F.2.2 Known reflectance termination . 46 F.3 Procedure . 46 F.3.1 Set-up characterization 46 F.3.2 Measurement procedure 47 F.3.3 Calculation 48 F.3.4 Measurement uncertainty. 48 Annex G (informative) Measurement uncertainty examples 49 G.1 Reduction of uncertaint
36、y by using reference grade terminations and related issues . 49 G.1.1 Motivations for using reference grade terminations on test cords . 49 G.1.2 Adjusting acceptance limits to allow for different expected losses when using reference grade and standard grade connectors . 49 G.2 Estimation of the mea
37、surement uncertainties 51 G.2.1 Measurement uncertainty. 51 G.2.2 Uncertainty due to the instrument 51 G.2.3 Uncertainty due to the source 51 G.2.4 Uncertainty due to the device under test 52 G.2.5 Example of uncertainty accumulation using a single power meter 53 G.2.6 Example of uncertainty accumul
38、ation using two power meters . 54 Annex H (informative) OTDR configuration information 55 H.1 Introductory remarks . 55 H.2 Fundamental parameters that define the operational capability of an OTDR 56 H.2.1 Dynamic range 56 H.2.2 Pulse width 56 H.2.3 Averaging time 56 H.2.4 Dead zone . 56 H.3 Other p
39、arameters 56 H.3.1 Index of refraction 56 H.3.2 Measurement range . 57 H.3.3 Distance sampling . 57 H.4 Other measurement configurations . 57 H.4.1 General . 57 H.4.2 Macro bend attenuation measurement . 57 H.4.3 Splice attenuation measurement 58 H.4.4 Measurement with high reflection connectors or
40、short length cabling . 58 H.4.5 Ghost 60 H.5 More on the measurement method 61 H.6 Bidirectional measurement 62 H.7 OTDR bi-directional trace analysis 63 H.8 Non recommended practices . 64 H.8.1 Measurement without tail cord . 64 BS EN 61280-4-2:2014IEC 61280-4-2:2014 IEC 2014 5 H.8.2 Cursor measure
41、ment . 64 Annex I (informative) Test cord attenuation verification 65 I.1 Introductory remarks . 65 I.2 Apparatus . 65 I.3 Procedure . 65 I.3.1 General . 65 I.3.2 Test cord verification for the one-cord and two-cord reference test methods when using non-pinned/unpinned and non-plug/socket style conn
42、ectors . 66 I.3.3 Test cord verification for the one-cord and two-cord reference test methods using pinned/unpinned or plug/socket style connectors . 67 I.3.4 Test cord verification for the three-cord reference test method using non-pinned/unpinned and non-plug/socket style connectors. 68 I.3.5 Test
43、 cord verification for the three-cord reference test method using pinned/unpinned or plug/socket style connectors . 70 Annex J (informative) Spectral attenuation measurement . 72 J.1 Applicability of test method . 72 J.2 Apparatus . 72 J.2.1 Broadband light source 72 J.2.2 Optical spectrum analyser
44、. 72 J.3 Procedure . 72 J.3.1 Reference scan . 72 J.3.2 Measurement scan 73 J.4 Calculations 73 Bibliography 74 Figure 1 Connector symbols 13 Figure 2 Symbol for cabling under test . 14 Figure 3 Configuration A Start and end of measured losses in reference test method . 16 Figure 4 Configuration B S
45、tart and end of measured losses in reference test method . 17 Figure 5 Configuration C Start and end of measured losses in reference test method . 17 Figure 6 Typical OTDR schematic 21 Figure 7 Return loss test set illustration . 22 Figure A.1 One-cord reference measurement . 26 Figure A.2 One-cord
46、test measurement . 26 Figure B.1 Three-cord reference measurement 27 Figure B.2 Three-cord test measurement . 28 Figure C.1 Two-cord reference measurement. 30 Figure C.2 Two-cord test measurement 30 Figure C.3 Two-cord test measurement for plug-socket style connectors . 30 Figure D.1 Test measuremen
47、t for method D . 34 Figure D.2 Location of the cabling under test ports 35 Figure D.3 Graphic construction of F1and F236 Figure D.4 Graphic construction of F1, F11, F21and F237 BS EN 61280-4-2:2014 6 IEC 61280-4-2:2014 IEC 2014 Figure D.5 Graphic representation of OTDR ORL measurement . 38 Figure D.
48、6 Graphic representation of reflectance measurement . 39 Figure E.1 Return loss test set illustration 41 Figure E.2 Measurement of the system internal attenuation Pref243 Figure E.3 Measurement of the system internal attenuation Pref143 Figure E.4 Measurement of the system reflected power Prs. 43 Fi
49、gure E.5 Measurement of the input power Pin. 44 Figure E.6 Measurement of the reflected power . 44 Figure F.1 Return loss test set illustration 46 Figure F.2 Measurement of Prs with reflections suppressed . 47 Figure F.3 Measurement of Prefwith reference reflector 47 Figure F.4 Measurement of the system reflected power Prs. 47 Figure F.5 Measurement of the reflected power . 48 Figure H.1 Splice and macro bend attenuation measur
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