1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationFibre optic interconnectingdevices and passive components Basic test and measurement proceduresPart 3-39: Examinations and measurements Physical contact (PC) optical connector re
2、ference plug selection for return loss measurementsBS EN 61300-3-39:2012National forewordThis British Standard is the UK implementation of EN 61300-3-39:2012. It isidentical to IEC 61300-3-39:2011. It supersedes BS EN 61300-3-39:1998which is withdrawn.The UK participation in its preparation was entr
3、usted 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 all the necessary provis
4、ions of acontract. Users are responsible for its correct application. The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 67979 7ICS 33.180.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published un
5、der the authority of the StandardsPolicy and Strategy Committee on 30 April 2012Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 61300-3-39:2012EUROPEAN STANDARD EN 61300-3-39 NORME EUROPENNE EUROPISCHE NORM March 2012 CENELEC European Committee for Electrotechnica
6、l Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61300-3
7、-39:2012 E ICS 33.180.20 Supersedes EN 61300-3-39:1997English version Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-39: Examinations and measurements - Physical contact (PC) optical connector reference plug selection for return loss measu
8、rements (IEC 61300-3-39:2011) Dispositifs dinterconnexion et composantspassifs fibres optiques - Mthodes fondamentales dessais et de mesures - Partie 3-39: Examens et mesures - Choix dune fiche de rfrence pour connecteur optique contact physique (PC) pour la mesure de laffaiblissement de rflexion (C
9、EI 61300-3-39:2011) Lichtwellenleiter -Verbindungselemente und passive Bauteile - Grundlegende Prf- und Messverfahren - Teil 3-39: Untersuchungen und Messungen - Auswahl des Referenzsteckverbinders fr Lichtwellenleiter-Steckverbinder mit physikalischem Kontakt (PC) fr Rckflussdmpfungsmessungen (IEC
10、61300-3-39:2011) This European Standard was approved by CENELEC on 2011-12-27. 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
11、 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 version in any other language made by translation under t
12、he 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, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estoni
13、a, Finland, 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. BS EN 61300-3-39:2012EN 61300-3-39:2012 - 2 - Foreword The t
14、ext of document 86B/3274/FDIS, future edition 2 of IEC 61300-3-39, 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 CENELEC as EN 61300-3-39:2012. The following dates are fixe
15、d: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2012-09-27 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2012-12-27 This document supersedes EN
16、 61300-3-39:1997. Changes from EN 61300-3-39:1997 are structure of the standard, general description and the annex. 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 a
17、ny or all such patent rights. Endorsement notice The text of the International Standard IEC 61300-3-39:2011 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 N
18、OTE Harmonized as EN 61300-1. BS EN 61300-3-39:2012- 3 - EN 61300-3-39:2012 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 indispe
19、nsable 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 When an international publication has been modified by common modifications, indicated by (mod), the releva
20、nt EN/HD applies. 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 measurements - Return loss EN 61300-3-6 - BS EN 61300-3-39:2012 2 61300-3-39 IEC:2011 CONTENTS 1 Scope .
21、 5 2 Normative references . 5 3 General description 5 3.1 General . 5 3.2 Definitions . 5 3.2.1 Reference plug 5 3.2.2 Acceptance return loss value RLa6 3.3 Reference plug selection Definition and evaluation of the IRL for a plug . 6 4 Apparatus . 7 5 Procedure 7 5.1 Reference plug selection . 7 5.2
22、 Measurement of minimum acceptable RL of a plug under test 7 5.3 Accuracy considerations 8 6 Details to be specified 8 Annex A (Informative) Measurement of the return loss of physical contact optical connectors using a reference plug 9 Bibliography 12 Figure 1 Behaviour of the acceptance limit RLain
23、 the return loss measurement as a function of the reference plug return loss RLref used in the test the curves are given for several values of allowed RLmgrades 6 Figure 2 Scheme for plug mating in the procedure for the intrinsic return loss estimation . 7 Figure 3 . 8 Figure A.1 Scheme of two fibre
24、s mated in a connection and the resulting refractive index shape 9 Figure A.2 Scheme of two plugs mated against the ideal plug 10 BS EN 61300-3-39:201261300-3-39 IEC:2011 5 FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS BASIC TEST AND MEASUREMENT PROCEDURES Part 3-39: Examinations and me
25、asurements Physical contact (PC) optical connector reference plug selection for return loss measurements 1 Scope The objective of this part of IEC 61300 is to select non-angled physical contact (PC) optical connector plugs for use as the reference plug in the return loss RL measurement and to define
26、 an acceptance return loss value RLafor use in plug acceptance testing. This procedure is for use to guarantee a certain return loss value RL when two plugs have been successfully tested against the reference connector when randomly mated. 2 Normative references The following referenced documents ar
27、e essential 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 any amendments) applies. IEC 61300-3-6. Fibre optic interconnecting devices and passive components Basic test and m
28、easurement procedures Part 3-6: Examinations and measurements Return loss 3 General description 3.1 General Return loss at mating points of mated non-angled PC optical connectors occurs due to multiple reflections at thin damaged layers on the fibre surface due to the polishing process. The refracti
29、ve index of the damaged layers is higher than that of the silica fibre. Due to this consideration, it is possible to derive a simple law for predicting the return loss of a connection formed by mating two plugs, and to define a parameter that characterizes the reflectance behaviour of each single pl
30、ug. When testing a plug against a reference one, the measured return loss depends on the characteristics of the reference plug used. In order to guarantee that two randomly mated plugs give a return loss greater than a minimum acceptable value RLm, the following steps are necessary: select the refer
31、ence plug with well-defined characteristics; set a lower limit, RLa, for the return loss of each plug measured against the reference plug. 3.2 Definitions 3.2.1 Reference plug A reference plug is defined as any plug in a group of plugs (minimum three) that, mated together in each possible combinatio
32、n, give results with a specified value of return loss RLref(see 5.1 for an operative method of reference plug selection). The value for RLrefand the BS EN 61300-3-39:2012 6 61300-3-39 IEC:2011 relevant tolerance range shall be indicated in the detail specification. However, this value has to be in t
33、he value range of the connectors that are measured with this reference. 3.2.2 Acceptance return loss value RLaTo ensure that any randomly mated plugs give a return loss greater than the allowed RLm, it is necessary to find the limit of the minimum acceptable return loss value RLafor the connector se
34、t (two plugs mated by an adapter) composed of the reference plug and the plug under test. This value is related to the RLrefof the reference plug and to RLmby the following equation: ( )110log 20 6 RL RL)/20RL (RL+=mrefmadB (1) Figure 1 shows the behaviour of RLaas a function of RLref for several RL
35、mvalues. For example, if 35 dB is allowed in random mated connectors and the reference plug used in the test has RLref= 40 dB, the plugs giving a return loss equal or greater than 37 dB against the reference plug will be accepted. 60 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 58 56 54 52 50 48
36、46 44 42 40 38 36 34 32 30 RLm= 30 dB RLm= 35 dB RLm= 40 dB RLm= 45 dB RLm= 50 dB RLm= 55 dB RLref(dB) RLa(dB)IEC 2504/11 Figure 1 Behaviour of the acceptance limit RLain the return loss measurement as a function of the reference plug return loss RLrefused in the test the curves are given for severa
37、l values of allowed RLmgrades 3.3 Reference plug selection Definition and evaluation of the IRL for a plug To develop a reference plug selection method it is useful to introduce a parameter named “Intrinsic Return Loss” (IRL) associated with each plug. This parameter is defined as the return loss of
38、 a connection formed by the plug ideally mated to itself. Using this parameter, the return loss of a two-plug connection is given by the following relationship: ( ) 6101020/20/2021RLIRLIRL+=log dB (2) BS EN 61300-3-39:201261300-3-39 IEC:2011 7 where IRL1and IRL2are the intrinsic return loss of the t
39、wo plugs composing the connector set. The IRL of each plug in a group of three plugs can be evaluated starting from the three return losses (RL12, RL23, RL31) measured on the three connector sets obtained by the three possible plug combinations (see Figure 2). From formula (1) a system of three equa
40、tions giving the IRL of the three plugs can be obtained: ( )/20/20/20131231210101020RLRLRLIRL+= log dB ( )/20/20/20231231210101020RLRLRLIRL+= log dB (3) ( )/20RL/20/203312312101020+= 10 - IRLRLRLlog dB Plug 1 Plug 2 Plug 3 RL12Connection 12 = plug 1 + plug 2 Connection 23 = plug 2 + plug 3 Connectio
41、n 31 = plug 3 + plug 1 RL31RL23IEC 2505/11 Figure 2 Scheme for plug mating in the procedure for the intrinsic return loss estimation 4 Apparatus The measurement set-up for return loss measurements shall be designed on the basis of the method used for the measurement of connector return loss, accordi
42、ng to IEC 61300-3-6. The measurement equipment shall be chosen with appropriate sensitivity for the return loss range that will be measured. It means that the error in the reflection loss measurement increases as the signal noise-to-noise ratio of the equipment decreases. 5 Procedure 5.1 Reference p
43、lug selection In the definition of the reference plug given in 3.1.1 the parameter RLrefis equivalent to the intrinsic return loss of the reference plug. Therefore, to select the reference plugs it is possible to apply the following procedure: a) the IRL of each plug shall be established in accordan
44、ce with 3.2.1; b) at least three plugs with the IRL value equal to the required RLrefshall be chosen; c) verify the selected plugs meet or exceed the return loss value RLrefby intermating. 5.2 Measurement of minimum acceptable RL of a plug under test Figure 3 shows the measurement set-up. 8 61300-3-
45、39 IEC:2011 The plug indicated by PR is a reference plug. The other side of the patchcord with the plug under test P shall be terminated with a suitable method T in order to greatly suppress reflection from this point. PR P T Measurement set-up IEC 2506/11 Figure 3 Return loss measurement set-up a)
46、According to IEC 61300-3-6, measure the return loss of the plug under test P against the reference plug PR. b) The minimum acceptable return loss value RLais given by equation (1) which relates RLa to the return loss of a reference plug, RLref, for each return loss class RLmof random mated plugs. c)
47、 The plugs which show return loss greater than RLaagainst the reference plug pass the test. 5.3 Accuracy considerations Due to the fact that the method does not consider the back reflection effects, a slight random error is present, particularly for values greater than 50 dB. This error in some case
48、s could be over 1 dB and have a Gaussian distribution with standard deviation typically below 0,5 dB. 6 Details to be specified The following details shall be specified: the method chosen for performing the return loss measurement; minimum return loss value allowed for random mating connectors, RLm;
49、 allowed return loss ranges of the reference plugs (or intrinsic return loss); minimum number of the reference plugs forming the reference group; type of termination T and minimum return loss. 61300-3-39 IEC:2011 9 Annex A (Informative) Measurement of the return loss of physical contact optical connectors using a reference plug A.1 General Return loss is a very important parameter for physical contact optica
