BS EN 2591-605-2002 Elements of electrical and optical connection - Test methods - Optical elements - Return loss《电器和光学连接元件 试验方法 光学元件 返回损失》.pdf

1、BRITISH STANDARD AEROSPACE SERIES BS EN 2591-605:2002 Elements of electrical and optical connection Test methods Part 605: Optical elements Return loss The European Standard EN 2591-605:2002 has the status of a British Standard ICS 49.060 BS EN 2591-605:2002 This British Standard, having been prepar

2、ed under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 11 July 2002 BSI 11 July 2002 ISBN 0 580 40041 7 National foreword This British Standard is the official English language version of EN

3、2591-605:2002. The UK participation in its preparation was entrusted by Technical Committee ACE/6, Aerospace avionic electrical and fibre optic technology, to Subcommittee ACE/6/10, Aerospace Fibre optic systems and equipment which has the responsibility to: A list of organizations represented on th

4、is subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index

5、”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself con

6、fer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in th

7、e UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 5 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTAN

8、DARD NORMEEUROPENNE EUROPISCHENORM EN2591605 June2002 ICS49.060 Englishversion AerospaceseriesElementsofelectricalandopticalconnection TestmethodsPart605:OpticalelementsReturnloss SriearospatialeOrganesdeconnexionlectriqueet optiqueMthodesdessaisPartie605:Organesoptiques Coefficientderflexion Luftun

9、dRaumfahrtElektrischeundoptische VerbindungselementePrfverfahrenTeil605:Optische ElementeRckstreuverluste ThisEuropeanStandardwasapprovedbyCENon8February2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanational

10、standardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertherespon

11、sibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden

12、,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN2591605:2002EEN2591605:2002(

13、E) 2 Foreword Thisdocument(EN2591605:2002)hasbeenpreparedbytheEuropeanAssociationofAerospace Manufacturers(AECMA). AfterenquiriesandvotescarriedoutinaccordancewiththerulesofthisAssociation,thisStandardhas receivedtheapprovaloftheNationalAssociationsandtheOfficialServicesofthemembercountriesof AECMA,

14、priortoitspresentationtoCEN. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidentical textorbyendorsement,atthelatestbyDecember2002,andconflictingnationalstandardsshallbe withdrawnatthelatestbyDecember2002. AccordingtotheCEN/CENELECInternalRegulations,thenational

15、standardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark, Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway, Portugal,Spain,Sweden,SwitzerlandandtheUnitedKingdomEN2591605:2002(E) 3 1 Scope Thisst

16、andardspecifiesamethodofmeasuringthereturnlossofopticalconnectionelements(including permanentconnections)andfibreopticcouplers. ItshallbeusedtogetherwithEN2591100. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreferenceprovisionsfromotherpublications. Thesenormativereferences

17、arecitedattheappropriateplacesinthetextandthepublicationsarelisted hereafter.Fordatedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplyto thisEuropeanStandardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthe latesteditionofthepublicationreferredtoapplies. E

18、N2591100 AerospaceseriesElementsofelectricalandopticalconnectionTestmethods Part100:General 1) 3 Definition Forthepurposesofthisstandard,thefollowingdefinitionapply: Returnloss Ratioofreflectedopticalpowertoincidentopticalpower. 4 Preparationofspecimens 4.1 Specimensshallbefittedwithnormalaccessorie

19、sandterminatedasspecifiedintheproduct standard.Cavitieswithunterminatedcontactsshallhavefillerplugsfitted(whereapplicable). Ifnotatstandardtestconditions,thespecimenshallbesubjectedtostandardtestconditionsandstabilizedat theseconditionsfor24hasdefinedinEN2591100. 4.2 Unlessotherwisespecifiedinthetec

20、hnicalspecification,thefollowingdetailsshallbestated: typeandlengthofcable/fibre; permittedvalue(indB)ofthereturnloss; couplercharacteristics. 5 Apparatus Itshallcomprise: aLightLaunchSystem(LLS)asdefinedinEN2591100; aLightDetectorSystem(LDS)asdefinedinEN2591100; anopticalfibreYcouplerwithsplittingr

21、atioKi,j(equippedwithconnectorsornot)whosecharacteristics havebeenestablishedatwavelength l 0 understandardtemperature. 1) PublishedasAECMAPrestandardatthedateofpublicationofthisstandardEN2591605:2002(E) 4 6 Method 6.1 Procedure Themethodiscalledthe“Couplermethod“becausethemeasuringdeviceisjoinedaro

22、undanopticalfibre couplerasillustratedinfigure1. Thetestsequenceis: a) adjustthelaunchconditionsto100%forspotdiameterand110%fornumericalaperture,then connectthecouplertoLLSandLDS. b) measurereflectedpower Poonport2ofthecoupler,itsfreeend3immersedinarefractiveindex matchingliquid. NOTE1 Power Poisthe

23、totalamountofpowerreflectedbythecouplerplusthepowerbackscatteredby thefibres. Figure1 Ki,jisthecouplersplittingratio(K 3,2 =0,5fora3dBcouplingvalue) Afusionsplicemaybeusedasappropriatetoenableacouplertobeusedforanumberofcutback terminationofdifferentspecimens. c) cutthefibreandinsertthespecimenSxass

24、howninfigure2andmeasure P1; NOTE2 Power P1isthetotalamountofpowerreflectedbythecouplerandthespecimenplusthefibre backscatteredpower. Figure2EN2591605:2002(E) 5 d) disconnectthespecimenandremovethepartBoftheopticalcord.DisconnecttheLDSofthecoupler andconnectitinA. e) immersetheport2ofthecouplerinthei

25、ndexmatchingliquidandthenmeasurepower P2(figure3); NOTE3 Power P2isthetotalamountofpowertransmittedthroughpointAofspecimenSx. Figure3 6.2 Finalmeasurementsandrequirements Calculationofthereturnloss(RL)ofspecimenSx Reflectioncoefficient R TotalpowerreflectedbySx TotalpowerincidentonSx = Powerreflecte

26、dbySx = P1 Po TotalpowerreflectedbySx = 1 K 3,2 ( P1 Po) TotalpowerincidentonSx = P2 - = 2 o 1 3,2 K 1 P P P R ThereturnlossRLofthespecimenisgivenby: - - = 2 o 1 3,2 K 1 log 20 RL P P P Particularattentionwillbepaidto: valueoftherefractiveindexat l 0 (sourcewavelength) couplercharacteristics; fibres

27、handlingduringthetest(bendradius).BS EN 2591-605:2002 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is inco

28、rporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if any

29、one finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: +44 (0)20 8996 9000. Fax: +44 (0)20 8996 7400. BSI offers members an individual updating serv

30、ice called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: +44 (0)20 8996 9001. Fax: +44 (0)20 8996 7001. Email: ordersbsi-

31、. Standards are also available from the BSI website at http:/www.bsi-. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide

32、 range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel: +44 (0)20

33、8996 7111. Fax: +44 (0)20 8996 7048. Email: infobsi-. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel: +44 (0)20 8996 7002.

34、Fax: +44 (0)20 8996 7001. Email: membershipbsi-. Information regarding online access to British Standards via British Standards Online can be found at http:/www.bsi- Further information about BSI is available on the BSI website at http:/www.bsi-. Copyright Copyright subsists in all BSI publications.

35、 BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopy

36、ing, recording or otherwise without prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. Details and advice can be obtained from the Copyright & Licensing Manager. Tel: +44 (0)20 8996 7070. Fax: +44 (0)20 8996 7553. Email: copyrightbsi-.