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
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