1、BRITISH STANDARD AEROSPACE SERIES BS EN 2591-601:2001 Elements of electrical and optical connection Test methods Part 601: Optical elements Insertion loss The European Standard EN 2591-601:2001 has the status of a British Standard ICS 49.060 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY C
2、OPYRIGHT LAWBS EN 2591-601:2001 This British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 14 December 2001 BSI 14 December 2001 ISBN 0 580 38072 6 Nation
3、al foreword This British Standard is the official English language version of EN 2591-601:2001. The UK participation in its preparation was entrusted to Technical Committee ACE/6, Aerospace Avionic Electrical and Optical Technology, to Subcommittee ACE/6/10, Aerospace - Fibre Optic Systems and Equip
4、ment, which has the responsibility to: A list of organizations represented on this 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 Ca
5、talogue under the section entitled “International Standards Correspondence Index”, 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 thei
6、r correct application. Compliance with a British Standard does not of itself confer 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; m
7、onitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 8, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates whe
8、n the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN2591601 November2001 ICS49.060 Englishversion AerospaceseriesElementsofelectricalandopticalconnection TestmethodsPart601:OpticalelementsInsertionloss Sriearospat
9、ialeOrganesdeconnexionlectriqueet optiqueMthodesdessaisPartie601:Organesoptiques Pertesdinsertion LuftundRaumfahrtElektrischeundoptische VerbindungselementePrfverfahrenTeil601:Optische ElementeEinfgungsdmpfung ThisEuropeanStandardwasapprovedbyCENon4June2001. CENmembersareboundtocomplywiththeCEN/CENE
10、LECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthre
11、eofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,Fr
12、ance,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2001CEN Allrightsofexploitationinanyf
13、ormandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN2591601:2001EEN2591601:2001(E) 2 Foreword ThisEuropeanStandardhasbeenpreparedbytheEuropeanAssociationofAerospaceManufacturers (AECMA). AfterinquiriesandvotescarriedoutinaccordancewiththerulesofthisAssociation,thisStandardhas receivedt
14、heapprovaloftheNationalAssociationsandtheOfficialServicesofthemembercountriesof AECMA,priortoitspresentationtoCEN. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidentical textorbyendorsement,atthelatestbyMay2002,andconflictingnationalstandardsshallbewithdrawnat
15、thelatestbyMay2002. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark, Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal, Spain,S
16、weden,SwitzerlandandtheUnitedKingdom.EN2591601:2001(E) 3 1 Scope Thisstandardspecifiesmethodsofmeasuringtheinsertionlossofopticalconnectionelements(including permanentconnections)andfibreopticcouplers. Thesemethodsaresuitableforsingleandmultichanneldevicesandhybridconfigurations. Itshallbeusedtogeth
17、erwithEN2591100. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreferenceprovisionsfromotherpublications. Thesenormativereferencesarecitedattheappropriateplacesinthetextandthepublicationsarelisted hereafter.Fordatedreferences,subsequentamendmentstoorrevisionsofanyofthesepublic
18、ationsapplyto thisEuropeanStandardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthe latesteditionofthepublicationreferredtoapplies. EN2591100 AerospaceseriesElementsofelectricalandopticalconnectionTestmethods Part100:General 1) 3 Preparationofspecimens 3.1 Specimensshallbeprepare
19、dasdefinedintheproductstandardandforeachmethodoftest: thefibreendsshallcomplywithrequirementsofEN2591100(Fibreendpreparationandtermination cleaning); thefibreendsshallbefixedtothelightlaunchanddetectorsystemsasdefinedinEN2591100; thefibre/cableusedforthetestshallmeettherequirementsoftheopticalconnec
20、tionelement,coupler orspliceproductstandard; movementofthefibres/cablesandtemporaryjointsshallbeminimizedduringthetestsetupand testingprocess; theminimumbendradiusofthefibre/cableshallnotbeexceeded; thefibrelengthsshallbeasstatedunlessotherwisedefinedinsubsequenttestrequirements. 3.2 Unlessotherwise
21、indicatedinthetechnicalspecification,thefollowingdetailsshallbespecified: method; numberofmeasurementstobeaveraged; preconditioningrequirements; recoveryprocedure; numberofchannelstobetestedinamultichanneldevice; maximumvalueofinsertionloss; maximumpermissiblestandarddeviationofinsertionloss; launch
22、conditions. 1) PublishedasAECMAPrestandardatthedateofpublicationofthisstandardEN2591601:2001(E) 4 4 Apparatus Itshallcomprise: aLightLaunchSystem(LLS)asdefinedinEN2591100; aLightDetectorSystem(LDS)asdefinedinEN2591100. Inaddition,thefollowingapparatusshallberequireddependinguponthemethodused: a) tem
23、poraryjoints(tj) 1) thejointsshallhavealowinsertionloss,goodperformancerepeatabilityandhaveminimumreflection loss.Indexmatchingmaterialmaybeused. 2) themeaninsertionlossandstandarddeviationofthejointsshallbespecifiedintheproductstandard. 3) thestandarddeviationofanytemporaryjointshallbeoneorderofmag
24、nitudebetterthanthatstatedin theproductstandardforthedeviceundertest. b) referencespecimen 1) thedimensionsandparametersshallbespecifiedintheproductstandard. 2) themeaninsertionlossshallbespecifiedintheproductstandard. 3) thestandarddeviationoftheinsertionlossshallbespecifiedintheproductstandard. 5
25、Methods Anumberofmethodsmaybeusedtomeasureinsertionloss.However,theprincipleisbasicallythesamefor eachmethod. First,theamountofusefulopticalpowerwhichcanbetransmittedthroughthecableshallbemeasured withoutthespecimensinstalled.Then,thespecimenshallbeinsertedintothecableandtheamountofuseful powershall
26、bemeasuredagain.Theinsertionlossshallbedefinedasthedecreaseintheamountof transmittedopticalpowerandshallbeexpressedasaratioindecibels(dB). ThelaunchconditionsshallbedefinedinEN2591100. 5.1 Method1 Itshallbelimitedtoasinglemeasurement.Itshallinvolvemakingtheinitialpowermeasurementina continuous(unbro
27、kenandwithouttemporaryjoints)fibre.Thefibreshallthenbebroken,thespecimen insertedandthepowermeasuredagain. ThismethodrequiresanewlengthoffibreaswellasthepreparationandinterfacingofthefibretotheLLS andLDSforeachspecimenmeasured. a) Initialmeasurementsetup,seefigure1. LLS LDS Po L L=(2 0,1 )m Figure1
28、b) MeasurepowerPo.EN2591601:2001(E) 5 c) CutfibrelengthLintotwoequalsections.ThepreparationoffibreendsshallcomplywithEN2591.Install thespecimenasshowninfigure2. 1 LLS LDS Pi = = Key 1 Specimen Figure2 d) MeasurepowerPi. e) Calculatetheinsertionlossusingthefollowingequation Insertionloss(dB)=10log Pi
29、 Po 5.2 Method2 Thismethodshallapplytopigtailedarrangements.Itshallusetwotemporaryjoints. NOTE Theresultswilldependonthequalityofthetwojointsandfibres.Insomesituations,anegative valueofinsertionlossmaybemeasured. a) Initialmeasurementsetup,seefigure3. LLS tjtj LDS Po L1 L2 L3 L1andL3shallnotexceed5m
30、 L2=(2 0,1 )m Figure3 b) MeasurepowerPo. c) RemovefibreL2andreplaceitwiththepigtailedspecimenasshowninfigure4. 1 LLS tj tjLDS Pi L1 L3 Key 1 Specimen Figure4 d) MeasurepowerPi. e) Calculatethespecimeninsertionlossusingthefollowingequation Insertionloss(dB)=10log Pi Po NOTE Halfofthetemporaryjointcan
31、beanopticalfaceontheLLSorLDS,whichmeansL1andL3can bezero.EN2591601:2001(E) 6 5.3 Method3 Thismethodisintendedtominimizetheambiguitiescreatedbyfibreparametermismatches.Itshallbe limitedtomeasuringpigtailedarrangementsandinvolvetheuseoftemporaryjoints. Althoughitincorporatesatemporaryjoint,themeasurem
32、entshallnotbedependentonthereproducibilityof thejoint. a) Initialmeasurementsetup,seefigure5. 1 LLS tj LDS Pi L1 L2 L3 Key 1 Specimen L2=L3=(1 0,1 )m L1 5m Figure5 b) MeasurepowerPi. c) CutthefibrebetweenthetemporaryjointandthespecimenatlocationL1asshowninfigure6. 12 LLS tj LDS L1 L1 Key 1C u t 2 Sp
33、ecimen L1=(0,5 0,1 )m Figure6 d) Removethespecimenanditsattachedfibresfromthetestcircuit. e) PreparethefibreendofL1asdefinedinEN2591100.CoupleittotheLDSasshowninfigure7. LLS tj LDS Po L1 L1 Figure7 f) MeasurepowerPo. g) Calculatethespecimeninsertionlossusingthefollowingequation Insertionloss(dB)=10l
34、og Po Pi 5.4 Method4 Thismethodshallapplytospecimenswithintegralcableterminations(patchcord)andusesareferencespecimen. a) Initialmeasurementsetup,seefigure8. 1 LLS Ra RbLDSPo L1 L2 Key 1 Referencespecimen L1=L2=(1 0,1 )m Figure8EN2591601:2001(E) 7 b) MeasurepowerPo. c) Disconnectthereferencespecimen
35、andinsertthetestspecimenasshowninfigure9. 1 L3 LLS Ra Rb LDSPi Key 1 Specimen L3 2m Figure9 d) MeasurepowerPi. e) Calculatetheinsertionlossusingthefollowingequation Insertionloss(dB)=10log Pi Po 5.5 Method5 Thismethodshallbelimitedtoevaluatingaconnectorsetadaptor.ItshallinvolvetheuseoftwoReference c
36、onnectorPlugsRPandReferenceAdaptorRAofknownperformance. a) Initialmeasurementsetup,seefigure10. 1 LLS RP RA RPLDS Po L1 L2 Key 1 Referencespecimen L1=L2 5m Figure10 b) MeasurepowerPo. c) RemoveRAandreplaceitwiththeAdaptorAtobemeasuredasshowninfigure11. 1 LLS RP A RPLDS Pi L1 L2 Key 1 Adaptator Figur
37、e11 d) MeasurepowerPi. e) CalculatetheinsertionlossofAusingthefollowingequation Insertionloss(dB)=10log Pi Po NOTE Inthismethod,theresultantvalueshallbetheadditionallossthattheadaptorundertestproduces, comparedtothatassociatedwiththereferenceadaptor,inpowerlevel(Po). Thismethodmayyieldlossvaluesthat
38、arenegative(apparentgainfortheadaptor)andcareshallbeusedin interpretingtheresults.EN2591601:2001(E) 8 5.6 StatisticalassessmentofinsertionlossConnectors Amorevalidassessmentoftheperformancecanbeachievedbycalculatingthemeanandstandard deviationofanumberofmeasurements.Thenumberofmeasurementsandthemeth
39、odforrematingthe connectorwhenmakingmultiplemeasurementsdependsonthenatureoftheparticularconnectorfamilyand arrangement. Thefollowingprocedureforrematingshallbefollowed: a) theconnectorsetshallbecompletelyuncoupledandrecoupledforeachmeasurement; b) nonkeyedconnectorsetsshallberelativelyrotated120bet
40、weencomponentsandmultiple measurementsmadeateachlocation; c) singlekeyedconnectorsshallhavemultiplemeasurementsmadeatthekeyedposition; d) multikeyedconnectorsshallhavemultiplemeasurementsmadeateachkeyedposition; e) patchcordconnectors:incombinationwiththeaboverotations,reversetheorientationofthepatc
41、hcord withrespecttothedirectionofpropagationofthelightandthefixedplugsandadaptors. Thenumberofmeasurementstobemaderelativetotheabovepositionsshallbespecifiedintheproduct standard. 5.7 Requirements Insertionlossandstandarddeviationshallnotexceedvaluesspecifiedintheproductstandard.BS EN 2591-601:2001 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 Europ
