1、 IEC 61300-3-6Edition 3.0 2008-12INTERNATIONAL STANDARD NORME INTERNATIONALEFibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-6: Examinations and measurements Return loss Dispositifs dinterconnexion et composants passifs fibres optiques Mthodes f
2、ondamentales dessais et de mesures Partie 3-6: Examens et mesures Affaiblissement de rflexion IEC61300-3-6:2008 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2008 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized i
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16、s donner des commentaires sur cette publication ou si vous avez des questions, visitez le FAQ du Service clients ou contactez-nous: Email: csciec.chTl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 61300-3-6Edition 3.0 2008-12INTERNATIONAL STANDARD NORME INTERNATIONALEFibre optic interconnecting devic
17、es and passive components Basic test and measurement procedures Part 3-6: Examinations and measurements Return loss Dispositifs dinterconnexion et composants passifs fibres optiques Mthodes fondamentales dessais et de mesures Partie 3-6: Examens et mesures Affaiblissement de rflexion INTERNATIONAL E
18、LECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE UICS 33.180.20 PRICE CODECODE PRIXISBN 2-8318-1019-2 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale 2 61300-3-6 IEC:2008 CONTENTS FOREWORD.5 1 Sc
19、ope.7 2 Normative references7 3 General description.7 3.1 Method 1 .8 3.2 Method 2 .8 3.3 Method 3 .8 3.4 Method 4 .8 3.5 Selection of reference measurement method .8 4 Apparatus and symbols.9 4.1 Device under test (DUT) 9 4.2 Method 1: measurements with OCWR9 4.2.1 Branching device (BD) .10 4.2.2 D
20、etector (D1, D2and D3) 10 4.2.3 Source (S1 and S2) 10 4.2.4 Temporary joint (TJ) 10 4.2.5 Termination (T)10 4.3 Method 2: measurements with OTDR.11 4.3.1 Optical time domain reflectometer (OTDR).11 4.3.2 Fibre sections (L1, L2, and L3)11 4.3.3 Temporary joints (TJ).11 4.4 Method 3: measurements with
21、 OLCR .11 4.4.1 Light source (S) .12 4.4.2 Branching device (BD) .12 4.4.3 Optical delay line (ODL) .12 4.4.4 Optical detector (D)12 4.4.5 Temporary joint (TJ) 12 4.4.6 Data processing unit 12 4.5 Method 4: measurements with an OFDR 13 4.5.1 RF network analyser 13 4.5.2 Optical heads Source (S) and
22、receiver (D) 13 4.5.3 Optical variable attenuator (A) (optional) 13 4.5.4 Optical amplifier (OA) (optional) .13 4.5.5 Isolator (I) (optional) 14 4.5.6 Branching device (BD) .14 4.5.7 Temporary joint (TJ) 14 4.5.8 Computer.14 5 Procedure.14 5.1 Launch conditions14 5.2 Pre-conditioning 14 5.3 DUT outp
23、ut port.14 5.4 Method 1: measurement with OCWR .14 5.4.1 Definition of the OCWR measurement14 5.4.2 Set-up characterization 15 5.4.3 Measurement procedure 17 61300-3-6 IEC:2008 3 5.4.4 Accuracy considerations 18 5.5 Method 2: measurement with OTDR.18 5.5.1 Definition of the OTDR measurement.18 5.5.2
24、 Evaluation of backscattering coefficient19 5.5.3 Measurement procedure 20 5.5.4 Accuracy considerations 21 5.6 Method 3: measurement with OLCR.21 5.6.1 Calibration procedure.21 5.6.2 Measurement procedure 21 5.6.3 Accuracy considerations 22 5.7 Method 4: measurements with OFDR.22 5.7.1 Calibration
25、procedure.22 5.7.2 Measurement procedure 22 5.7.3 Accuracy considerations 22 6 Details to be specified.23 6.1 Return loss measurement with OCWR .23 6.1.1 Reference components 23 6.1.2 Branching device .23 6.1.3 Detector.23 6.1.4 Source.24 6.1.5 Temporary joint24 6.1.6 Termination .24 6.2 Return loss
26、 measurement with OTDR 24 6.2.1 Reference components 24 6.2.2 OTDR24 6.2.3 L1, L2, and L3.24 6.2.4 Fibre24 6.3 Return loss measurement with OLCR.24 6.3.1 Reference components 24 6.3.2 Source.25 6.3.3 Branching device (BD) .25 6.4 Return loss measurement with OFDR 25 6.4.1 Reference components 25 6.4
27、2 Vector network analyser.25 6.4.3 Branching device .25 6.4.4 Source.25 6.4.5 Detector.25 6.4.6 Optical amplifier (optional) .26 6.4.7 Isolator (optional).26 6.4.8 Calibration .26 6.5 Measurement procedure 26 Annex A (informative) Comparison of return loss detectable by four different methods .27 F
28、igure 1 Measurement set-up of return loss OCWR method9 Figure 2 Measurement set-up of return loss with OTDR method11 Figure 3 Measurement set-up of return loss with OLCR method12 Figure 4 Measurement set-up of return loss with OFDR method13 Figure 5 Measurement set-up of the system reflected power.1
29、5 4 61300-3-6 IEC:2008 Figure 6 Measurement set-up of the branching device transfer coefficient.16 Figure 7 Measurement set-up of the splitting ratio of the branching device 16 Figure 8 Measurement set-up of return loss with an OCWR 17 Figure 9 Typical OTDR trace of the response to a reflection19 Fi
30、gure A.1 Comparison of detectable return loss, resolution and measurable distance for four return loss measurement methods 27 Table 1 OTDR parameters for some pulse duration 20 Table 2 Example of system data and relevant dynamic range23 61300-3-6 IEC:2008 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION
31、 FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS BASIC TEST AND MEASUREMENT PROCEDURES Part 3-6: Examinations and measurements Return loss FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechni
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41、ion. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61300-3-6 has been prepared by subcommittee 86B: Fibre opti
42、c interconnecting devices and passive components, of IEC technical committee 86: Fibre optics. This third edition cancels and replaces the second edition published in 2003. It constitutes a technical revision. The changes with respect to the previous edition are to reconsider the constitution of the
43、 document and launch conditions for multimode fibres. 6 61300-3-6 IEC:2008 The text of this standard is based on the following documents: FDIS Report on voting 86B/2762/FDIS 86B/2792/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated i
44、n the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of IEC 61300 series, published under the general title, Fibre optic interconnecting devices and passive components Basic test and measurement procedures can be found on the IEC
45、 website. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn,
46、 replaced by a revised edition, or amended. 61300-3-6 IEC:2008 7 FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS BASIC TEST AND MEASUREMENT PROCEDURES Part 3-6: Examinations and measurements Return loss 1 Scope This part of IEC 61300 presents procedures for the measurement of the return l
47、oss (RL) of a fibre optic device under test (DUT). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including
48、any amendments) applies. IEC 60793-2 (all parts), Optical fibres Product specifications 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 components
49、 Basic test and measurement procedures Part 3-1: Examinations and measurements Visual examination IEC 61300-3-39, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-39: Examinations and measurements PC optical connector reference plug selection 3 General description RL, as used in this standard, is the
