BS EN 61280-4-2:2014
$215.11
Fibre-optic communication subsystem test procedures – Installed cable plant. Single-mode attenuation and optical return loss measurement
| Published By | Publication Date | Number of Pages |
| BSI | 2014 | 80 |
This part of IEC 61280 is applicable to the measurement of attenuation and optical return loss of installed optical fibre cable plant using single-mode fibre. This cable plant can include single-mode optical fibres, connectors, adapters, splices and other passive devices. The cabling may be installed in a variety of environments including residential, commercial, industrial and data centre premises, as well as outside plant environments.
This standard may be applied to all single-mode fibre types including those designated by IEC 60793โ2โ50 as Class B fibres.
The principles of this standard may be applied to cable plants containing branching devices (splitters) and at specific wavelength ranges in situations where passive wavelength selective components are deployed, such as WDMs, CWDM and DWDM devices.
This standard is not intended to apply to cable plant that includes active devices such as fibre amplifiers or dynamic channel equalizers.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 6 | English CONTENTS |
| 11 | INTRODUCTION |
| 12 | 1 Scope 2 Normative references |
| 13 | 3 Terms, definitions, graphical symbols and abbreviations 3.1 Terms and definitions |
| 15 | 3.2 Graphical symbols Figures Figure 1 โ Connector symbols |
| 16 | 3.3 Abbreviations Figure 2 โ Symbol for cabling under test |
| 17 | 4 Measurement methods 4.1 General |
| 18 | 4.2 Cabling configurations and applicable test methods 4.2.1 Cabling configurations and applicable test methods for attenuation measurements Figure 3 โ Configuration A โ Start and end of measured losses in reference test method Tables Table 1 โ Cabling configurations |
| 19 | Figure 4 โ Configuration B โ Start and end of measured losses in reference test method Figure 5 โ Configuration C โ Start and end of measured losses in reference test method Table 2 โ Test methods and configurations |
| 20 | 4.2.2 Cabling configurations and applicable test methods for optical return loss measurements 4.3 Overview of uncertainties 4.3.1 General 4.3.2 Test cords 4.3.3 Reflections from other interfaces 4.3.4 Optical source |
| 21 | 4.3.5 Output power reference 4.3.6 Received power reference 4.3.7 Mode field diameter variation 4.3.8 Bi-directional measurements 5 Apparatus 5.1 General 5.2 Light source 5.2.1 Stability |
| 22 | 5.2.2 Spectral characteristics 5.2.3 Launch cord 5.3 Receive or tail cord |
| 23 | 5.4 Substitution cord 5.5 Power meter โ LSPM methods only 5.6 OTDR apparatus Figure 6 โ Typical OTDR schematic |
| 24 | 5.7 Return loss test set 5.8 Connector end-face cleaning and inspection equipment 5.9 Adapters 6 Procedures 6.1 General Figure 7 โ Return loss test set illustration |
| 25 | 6.2 Common procedures 6.2.1 Care of the test cords 6.2.2 Make reference measurements (LSPM and OCWR methods only) 6.2.3 Inspect and clean the ends of the fibres in the cabling 6.2.4 Make the measurements 6.2.5 Make the calculations 6.3 Calibration |
| 26 | 6.4 Safety 7 Calculations 8 Documentation 8.1 Information for each test 8.2 Information to be made available |
| 27 | Annex A (normative) One-cord reference method A.1 Applicability of test method A.2 Apparatus A.3 Procedure |
| 28 | A.4 Calculation A.5 Components of reported attenuation Figure A.1 โ One-cord reference measurement Figure A.2 โ One-cord test measurement |
| 29 | Annex B (normative) Three-cord reference method B.1 Applicability of test method B.2 Apparatus B.3 Procedure Figure B.1 โ Three-cord reference measurement |
| 30 | B.4 Calculations B.5 Components of reported attenuation Figure B.2 โ Three-cord test measurement |
| 31 | Annex C (normative) Two-cord reference method C.1 Applicability of test method C.2 Apparatus C.3 Procedure |
| 32 | Figure C.1 โ Two-cord reference measurement Figure C.2 โ Two-cord test measurement Figure C.3 โ Two-cord test measurement for plug-socket style connectors |
| 33 | C.4 Calculations C.5 Components of reported attenuation |
| 34 | Annex D (normative) Optical time domain reflectometer D.1 Applicability of test method D.2 Apparatus D.2.1 General D.2.2 OTDR D.2.3 Test cords |
| 35 | D.3 Procedure (test method) Table D.1 โ Typical launch and tail cord lengths |
| 36 | D.4 Calculation of attenuation D.4.1 General D.4.2 Connection location Figure D.1 โ Test measurement for method D |
| 37 | D.4.3 Definition of the power levels F1 and F2 Figure D.2 โ Location of the cabling under test ports |
| 38 | D.4.4 Alternative calculation Figure D.3 โ Graphic construction of F1 and F2 |
| 39 | D.5 Calculation of optical return loss Figure D.4 โ Graphic construction of F1, F11, F21 and F2 |
| 40 | Figure D.5 โ Graphic representation of OTDR ORL measurement |
| 41 | D.6 Calculation of reflectance for discrete components Figure D.6 โ Graphic representation of reflectance measurement |
| 42 | D.7 OTDR uncertainties |
| 43 | Annex E (normative) Continuous wave optical return loss measurement โ Method A E.1 Applicability of test method E.2 Apparatus E.2.1 General E.2.2 Light source E.2.3 Branching device or coupler Figure E.1 โ Return loss test set illustration |
| 44 | E.2.4 Power meters E.2.5 Connector interface E.2.6 Low reflection termination E.3 Procedure E.3.1 Test set characterization |
| 45 | Figure E.2 โ Measurement of the system internal attenuation Pref2 Figure E.3 โ Measurement of the system internal attenuation Pref1 Figure E.4 โ Measurement of the system reflected power Prs |
| 46 | E.3.2 Measurement procedure E.3.3 Calculations Figure E.5 โ Measurement of the input power Pin Figure E.6 โ Measurement of the reflected power |
| 47 | E.3.4 Measurement uncertainty |
| 48 | Annex F (normative) Continuous wave optical return loss measurement โ Method B F.1 Applicability of test method F.2 Apparatus F.2.1 General requirements F.2.2 Known reflectance termination F.3 Procedure F.3.1 Set-up characterization Figure F.1 โ Return loss test set illustration |
| 49 | F.3.2 Measurement procedure Figure F.2 โ Measurement of Prs with reflections suppressed Figure F.3 โ Measurement of Pref with reference reflector Figure F.4 โ Measurement of the system reflected power Prs |
| 50 | F.3.3 Calculation F.3.4 Measurement uncertainty Figure F.5 โ Measurement of the reflected power |
| 51 | Annex G (informative) Measurement uncertainty examples G.1 Reduction of uncertainty by using reference grade terminations and related issues G.1.1 Motivations for using reference grade terminations on test cords G.1.2 Adjusting acceptance limits to allow for different expected losses when using reference grade and standard grade connectors Table G.1 โ Expected loss for examples (see NOTE 1) |
| 53 | G.2 Estimation of the measurement uncertainties G.2.1 Measurement uncertainty G.2.2 Uncertainty due to the instrument G.2.3 Uncertainty due to the source |
| 54 | G.2.4 Uncertainty due to the device under test |
| 55 | G.2.5 Example of uncertainty accumulation using a single power meter Table G.2 โ Example of uncertainty accumulation using a single power meter |
| 56 | G.2.6 Example of uncertainty accumulation using two power meters Table G.3 โ Example of uncertainty accumulation using two power meters |
| 57 | Annex H (informative) OTDR configuration information H.1 Introductory remarks |
| 58 | H.2 Fundamental parameters that define the operational capability of an OTDR H.2.1 Dynamic range H.2.2 Pulse width H.2.3 Averaging time H.2.4 Dead zone H.3 Other parameters H.3.1 Index of refraction |
| 59 | H.3.2 Measurement range H.3.3 Distance sampling H.4 Other measurement configurations H.4.1 General H.4.2 Macro bend attenuation measurement Table H.1 โ Example of effective group index of refraction values |
| 60 | H.4.3 Splice attenuation measurement H.4.4 Measurement with high reflection connectors or short length cabling Figure H.1 โ Splice and macro bend attenuation measurement |
| 61 | Figure H.2 โ Attenuation measurement with high reflection connectors |
| 62 | H.4.5 Ghost Figure H.3 โ Attenuation measurement of a short length cabling |
| 63 | H.5 More on the measurement method Figure H.4 โ OTDR trace with ghost |
| 64 | H.6 Bidirectional measurement Figure H.5 โ Cursor positioning |
| 65 | H.7 OTDR bi-directional trace analysis Figure H.6 โ Bidirectional OTDR trace display Figure H.7 โ Bi-directional OTDR trace loss analysis |
| 66 | H.8 Non recommended practices H.8.1 Measurement without tail cord H.8.2 Cursor measurement |
| 67 | Annex I (informative) Test cord attenuation verification I.1 Introductory remarks I.2 Apparatus I.3 Procedure I.3.1 General |
| 68 | 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 connectors Figure I.1 โ Obtaining reference power level P0 |
| 69 | I.3.3 Test cord verification for the one-cord and two-cord reference test methods using pinned/unpinned or plug/socket style connectors Figure I.2 โ Obtaining power level P1 Figure I.3 โ Obtaining reference power level P0 Figure I.4 โ Obtaining power level P1 |
| 70 | I.3.4 Test cord verification for the three-cord reference test method using non-pinned/unpinned and non-plug/socket style connectors Figure I.5 โ Obtaining reference power level P0 Figure I.6 โ Obtaining power level |
| 71 | Figure I.7 โ Obtaining reference power level P0 Figure I.8 โ Obtaining power level P1 |
| 72 | I.3.5 Test cord verification for the three-cord reference test method using pinned/unpinned or plug/socket style connectors Figure I.9 โ Obtaining power level P6 Figure I.10 โ Obtaining reference power level P0 |
| 73 | Figure I.11 โ Obtaining power level P1 |
| 74 | Annex J (informative) Spectral attenuation measurement J.1 Applicability of test method J.2 Apparatus J.2.1 Broadband light source J.2.2 Optical spectrum analyser J.3 Procedure J.3.1 Reference scan |
| 75 | J.3.2 Measurement scan J.4 Calculations Figure J.1 โ Result of spectral attenuation measurement |
| 76 | Bibliography |
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