FireFly™ Optical Half Cables - Samtec...

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FireFly™OpticalHalfCables

ApplicationNote

Revision2:Feb2018

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COPYRIGHTS,TRADEMARKSANDPATENTS

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Disclaimer

Theinformationinthispublicationmaychangewithoutnotice.Allmaterialspublishedhereare“AsIs”andwithout impliedorexpresswarranties.Samtec, Inc.doesnotwarrant that thispublicationwillbewithout error, or that defects will be corrected. Samtec, Inc. makes every effort to present ourcustomers an excellent and useful publication, but we do not warrant or represent the use of thematerialshere in termsof theiraccuracy, reliabilityorotherwise.Therefore,youagree thatallaccessanduseofthispublication’scontentisatyourownrisk.

Patents

Patents:8588562and8588561.AdditionalPatentspending.

UpdatedDocumentation

Please contact [email protected] to get access to the latest PCIe® documentation including theOpticalCableAssemblyUserManual,aswellasthePCIe®OverFiberGuide,andtoensurethatyouhavethelatestversionofthisdocument.

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TableofContents

1 FIREFLY™OPTICALCABLES....................................................................................................................52 MPOCONNECTORS...............................................................................................................................83 MPOBULKHEADADAPTERSASOPTICALPANELADAPTERS.................................................................94 FIBEROPTICPATCHCABLES................................................................................................................105 HALFCABLEBACK-TO-BACKOPERATIONWITHOUTPATCHCABLES..................................................136 ECUO–T12TOECUO–R12..................................................................................................................137 ECUO–T12TOFOPCTOECUO–R12...................................................................................................158 ECUO–Y12TOECUO–Y12..................................................................................................................189 ECUO–Y12TOFOPCTOECUO–Y12...................................................................................................2010 ECUO–B04TOECUO–B04.................................................................................................................2211 ECUO-B04TOFOPCTOECUO-B04......................................................................................................2412 ECUO-B04TOMIMICAQSFP+PLUGGABLEMODULE........................................................................2613 ECUO-B04TOFOPCTOQSFP+PLUGGABLEMODULE........................................................................2714 REFERENCES........................................................................................................................................29

ListofFigures

Table1.FireFlyHalfOpticalCableConfigurations.......................................................................................6

Figure1.FireFlyHalfOpticalCable(-T12,-R12or-B04)..............................................................................6

Figure2.FireFly“Y”HalfOpticalCable(-Y12)..............................................................................................7

Figure3.12ChannelMaleMPOConnector.................................................................................................8

Figure4.MPOAdapters,Opposed(Left)andAligned(Right)......................................................................9

Figure5.12FiberOpticalPatchCableSignalMap.....................................................................................11

Figure6.24FiberOpticalPatchCableSignalMap.....................................................................................12

Figure7.ECUO-T12toECUO-R12SignalMap............................................................................................14

Figure8.ECUO-T12toFOPCtoECUO-R12SignalMap..............................................................................16

Figure9.ECUO-T12toFOPCtoECUO-R12SignalMap..............................................................................17

Figure10.ECUO-Y12toECUO-Y12SignalMap..........................................................................................19

Figure11.ECUO-Y12toFOPCtoECUO-Y12SignalMap............................................................................21

Figure12.ECUO-B04toECUO-B04SignalMap..........................................................................................23

Figure13.ECUO-B04toFOPCtoECUO-B04SignalMap............................................................................25

Figure14.ECUO-B04toMimicaQSFP+PluggableModule.......................................................................26

Figure15.ECUO-B04toFOPCtoQSFP+PluggableModule.......................................................................28

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ChangeHistory

Revision# Reason Author Date

01 InitialDraft RogerMiller 1/4/2016

02 CorrectionstoSec11 R.Miller 2/19/2018

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1 FireFly™OpticalCablesSamtecmanufacturesFireFlyactiveoptical cables (AOCs)whichprovideamid-boardmountedopticalinterconnectsolutionforchip-to-chip,board-to-boardorsystem-to-systemapplications,atdataratesupto 28 Gbps and link distances up to 100 m. FireFly optical modules are currently available in twoconfigurations.The first configuration consistsofa separate transmitter (TX)and receiver (RX)opticalmodule, each having 12 unidirectional (half duplex) optical channels. Together, the TX and RX cablesform a 12 channel (x12) full duplex optical link. The second configuration is a 4 channel (x4) opticaltransceiver,whichcontains4bidirectional(fullduplex)opticallinksinasinglemodule.

The active and opto-electronic circuitry in the FireFly opticalmodule is packaged on a printed circuitboard(PCB)substrate,whichisintegratedtogetherwithanopticalblockandheatsink.Theribbonfiberispermanentlyattachedthroughtheopticalblocktotheopticalengine.TheFireFlymoduleplugs intotheuserhostPCBviaatwopartconnectorsystem,whichisolatesthehighspeedelectricalsignalsfromthelowspeedcontrolandDCpower.

FireFlyopticalcablesareavailableintwoversions:AfullAOC,oraHalfOpticalCable(HOC).AfullAOChas FireFly opticalmodules on both ends of the cable, connected togetherwith a 12 channel ribbonfiber. This type of cable is used for chip-to-chip flyover applications on a host PCB. The cables areavailableinvariousfiberlengths.

Inboard-to-boardorsystem-to-systemapplications,itisusuallynecessarytoroutethefiberinterconnectthroughachassisbulkhead,orpre-installedstructuredcabling.Inthiscase,apairofHalfOpticalCables(HOC)istypicallyused,togetherwithafiberopticpatchcable(FOPC),andbulkheadOpticalPanelAdapters(OPA).ThisapplicationnotedealsspecificallywithHOCs,andhowtheyshouldbeconnectedtogether.

TheFireFlyHOCconsistsofanopticalmoduleanditsribbonfiberpigtail.TheribbonfiberisnormallyterminatedonthefarendwithanMPOstylemulti-channelopticalconnector.MPOconnectorsareavailablein12or24opticalchannels,andcanbeconfiguredasmaleorfemale.OnecommonbrandofMPOconnectoristheMTP™,madebyUSConec.Othertypesofopticalconnectorscanbeinstalleduponrequest.However,MPOisbyfarthemostcommonlyused.

TheMPOendoftheHOCispluggedintoabulkheadmountedOPA.ThesameisdonewiththeHOCattheremoteequipment.AlongFOPCisusuallyusedtoconnectbetweenthetwosystems.

ThebasepartnumberforaFireFlycableisECUO-xxx.Thelast3charactersofthebasepartnumberdefinethecableconfiguration.Table1listsallthepossiblehalfcableconfigurations.

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HalfOpticalCableBasePartNumber

Description

ECUO-T12 AX12TXUnidirectionalopticalmoduleterminatedina12fiberMPOconnector.12halfduplexopticalTXchannelsaresupported.

ECUO-R12 AX12RXUnidirectionalopticalmoduleterminatedina12fiberMPOconnector.12halfduplexopticalRXchannelsaresupported.

ECUO-B04 Ax4Bidirectionalopticalmoduleterminatedina12fiberMPOconnector.4fullduplexopticalchannelsaresupported.

ECUO-Y12 Ax12TXmoduleandax12RXmodulejoinedina“Y”configuration,andterminatedtoasingle24fiberMPOconnector.12fullduplexopticalchannelsaresupported.

Table1.FireFlyHalfOpticalCableConfigurations

Figure1showsapictureofaFireFlyhalfopticalcable,whichisrepresentativeofanECUO-T12,ECUO-R12orECUO-B04cable.Figure2showsaFireFlyECUO-Y12halfopticalcable.

Figure1.FireFlyHalfOpticalCable(-T12,-R12or-B04)

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Figure2.FireFly“Y”HalfOpticalCable(-Y12)

Aswillbedescribedindetailinthefollowingsections,theMPObulkheadadaptersandtheFOPCsareavailableindifferentconfigurations,whichaffecthowtheopticalsignalsaremappedontotheconnectors.Furthermore,SamtecusesaspecificsignalmapbetweenthefiberribboncableoftheHOCandtheMPOconnector.Becauseofthis,itisnecessarytousetheproperMPOadapterandFOPCconfiguration.Otherwise,end-to-endconnectivitymaynotbeachievedbetweentheHostandRemoteTransmit(Tx)andReceive(Rx)opticalchannels.ThepurposeofthisapplicationnoteistodefinetheproperconfigurationstobeusedwithSamtecHOCs,basedontheintendedapplication.

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2 MPOConnectorsMPO connectors arewidely used in parallel optical applications. TheMPO connector provides a highdensity optical connectivity solution, together with a mechanical mechanism to provide positivelatching. TheMPO connectors used in Samtec half optical cables are configured in either 12 or 24opticalchannels.ApairofMPOconnectorscanbematedthroughabulkheadmountedMPOadapter,whichoccupiesverylittlespaceontheequipmentpanel.

Figure3showsa12channelmaleMPOconnector.TheMPOconnectorconsistsofaMTferrule,MPOhousing,andalatchingmechanism.ThemaleMTferrulecontainsthe12opticalchannelsandtheguidepins.AfemaleMTferrulehasholesthataccepttheguidepinsfromthemaleMTferrule.The12opticalchannelsarearranged ina single rowon theMT ferrule. Ina24channelMPOconnector, theopticalchannelsarearrangedin2rowsof12channelseach.

TheferruleisinstalledintotheMPOhousing.TheMPOhousinghasaguidekey,whichensuresthattheopticalchannelnumbersareorientedproperlywith respect to theMPOadapter.TheMPOhousing isenclosed by a spring loaded latchingmechanism.When twoMPO cables aremated through aMPObulkhead adapter, the spring loaded latching mechanism keeps the two MT ferrules firmly seatedagainsteachother.ItisimportantthatthetwoMTferrulesarefirmlyseatedagainsteachotherinordertoeliminateanyairgap,whichminimizestheopticalattenuationthroughthematedconnectorpair.

Figure3.12ChannelMaleMPOConnector

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3 MPOBulkheadAdaptersasOpticalPanelAdaptersTheMPObulkheadopticalpaneladapters(OPA)areavailablein2differentconfigurations,definedbytherelativeorientationoftheconnectorkeysoneachendoftheadapter:

• Opposed• Aligned

Opposedadaptershavetheconnectorkeysonoppositesidesoftheadapter(thekeysareopposingeachother).TheresultisthattheMPOconnectorswhichplugintotheadapterwillberotated180degreesinrelationtoeachother.Alignedadaptershavetheconnectorkeysonthesamesideoftheadapter(keysalignedwitheachother).Theresultisthattheconnectorswillbealignedinrelationtoeachother.SamteccansupplytheMPOadapters,ortheycanbepurchasedfromothervendors.TheMPOadapterswillworkwitheither12or24channelMPOconnectors.Figure4showsthetwotypesofMPObulkheadadapters.

Figure4.MPOAdapters,Opposed(Left)andAligned(Right)

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4 FiberOpticPatchCablesInaHalf-Cableapplication,aFiberOpticPatchCable (FOPC) is typicallyused toconnectbetween thehost and target PCIe® equipment, at theMPObulkhead adapters. The FOPCs are available in variouslengths.SamteccansupplytheFOPCs,ortheycanbepurchasedfromvarioussuppliers.LiketheMPOconnectors,theyareavailablewith12or24opticalchannels.

Patch cables are commonly available in 2 different styles, depending on how the optical fibers aremappedonto theFOPCMPOconnector. Themap scheme is referred toas thepolarityof theopticalsignals.

Figure5showstheopticalsignalmapfor12channelgenericpatchcables,ofTypeAandTypeB.ATypeA cablemaps pin 1 on one end of the cable to pin 1 on the other end, and pin 2 to pin 2, etc. It issometimesreferredtoasa“straightthrough”cable.ATypeBcableflipsthechannelsbetweenends.Inotherwords,pin1ofoneendconnectstopin12ontheotherend,pin2topin11,etc.Itissometimesreferred to as an “inverted” cable. Samtec only supplies the Type B FOPC, but it is important tounderstandthedifferencesbetweenthetwocabletypes.

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Figure5.12FiberOpticalPatchCableSignalMap

TYPE Aside a 12 fiber (a) side b

mpo position

fiber color

mpo position

1 blue 1

2 orange 2

3 green 3

4 brown 4

5 slate 5

6 white 6

7 red 7

8 black 8

9 yellow 9

10 violet 10

11 rose 11

12 aqua 12

TYPE Bside a 12 fiber (b) side b

mpo position

fiber color

mpo position

1 blue 12

2 orange 11

3 green 10

4 brown 9

5 slate 8

6 white 7

7 red 6

8 black 5

9 yellow 4

10 violet 3

11 rose 2

12 aqua 1

12-Fiber Connector

Position 1

Key

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A24fiberFOPCisrequiredforthe–Y12“Ycable”configuration.The24fiberFOPCpatchcableisavailablefromSamtecwithTypeCpolarityonly.

Figure6showstheopticalsignalmapfora24fiberFOPC.Position1ononeendofthecableconnectstoposition13ontheotherend,position2connectstoposition14,etc.Thechannelsareroutedtotheoppositerowonthefarendconnector,whilemaintainingpositionwithinthesamecolumn.

Figure6.24FiberOpticalPatchCableSignalMap

TYPE Cside a 24 fiber (c) side b

mpo position

fiber color

mpo position

1 blue 13

2 orange 14

3 green 15

4 brown 16

5 slate 17

6 white 18

7 red 19

8 black 20

9 yellow 21

10 violet 22

11 rose 23

12 aqua 24

13 blue (+) 1

14 orange (+) 2

15 green (+) 3

16 brown (+) 4

17 slate (+) 5

18 white (+) 6

19 red (+) 7

20 black (+) 8

21 yellow (+) 9

22 violet (+) 10

23 rose (+) 11

24 aqua (+) 12

24-Fiber Connector

Key

Position 1

Position 13

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5 HalfCableBack-to-BackOperationwithoutPatchCablesInsomeinstances, itmaybedesirabletooperatetwoFireFlyHOCs inaback-to-backconfiguration. Inthis application, the MPO ends of the two cables are simply connected together, through an MPOadapter,withoutusingapatchcable.

Typicalapplicationsare:aquickloopbacktest,ortoevaluatehalfcableconnectivityovervariouslengthsorwithmultiplehost/targetcombinations.

CaremustbetakentousetheproperpolarityMPOadapter,aswillbedescribed laterforeachoftheFireFlyhalfcables.

6 ECUO–T12toECUO–R12This section describes the back-to-back configuration for two ECUO 12 channel unidirectional cables,onecablebeinga12channelTX(ECUO-T12)andtheotherbeinga12channelRX(ECUO-R12).

Figure7showsthesignalmapforback-to-backoperationoftwoHOCs.Bothofthesehalf-cablesusea12channelMPOconnector.NotethatanopposedMPOadapterisrequired.Followingthesignalflow,Tx1ontheleft-handcableconnectstoRx1ontheright-handcable,andsoon,withallTxchannelsononecablebeingconnectedtothecorrespondingRxchannelontheothercable,andviceversa.

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Figure7.ECUO-T12toECUO-R12SignalMap

Opposed MPO Adapter OPA-S-1-FECUO-T12

ECUO-R12

12-Rx11

1-Rx01-Tx0

12-Tx11

ECUO-T12 signal map

function fiber color

mpo position

Tx0 blue 1

Tx1 orange 2

Tx2 green 3

Tx3 brown 4

Tx4 slate 5

Tx5 white 6

Tx6 red 7

Tx7 black 8

Tx8 yellow 9

Tx9 violet 10

Tx10 rose 11

Tx11 aqua 12

ECUO-R12 signal map


mpo position

Rx0 blue 1

Rx1 orange 2

Rx2 green 3

Rx3 brown 4

Rx4 slate 5

Rx5 white 6

Rx6 red 7

Rx7 black 8

Rx8 yellow 9

Rx9 violet 10

Rx10 rose 11

Rx11 aqua 12

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7 ECUO–T12toFOPCtoECUO–R12This section describes the configuration where an ECUO-T12 half cable and an ECUO-R12 half cableare joined using a 12 fiber FOPC. These half cables each have a 12 fiberMPO connector. One cablecontains a 12 channel Tx (-T12) and the other contains a 12 channel Rx (-R12). As was mentionedearlier,thisisacommonapplicationwhentheoptical linkmustbepassedthroughabulkheadateachcableend.

Figure8showsthesignalmapforthisconfigurationwhenaFOPCisused.NotethatonealignedandoneopposedMPOadapterarerequired.Tracingthesignalflowthroughthediagram,itisseenthatalltheTxchannelsononecableconnectwiththecorrespondingRxchannelontheothercable,andviceversa.

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Figure8.ECUO-T12toFOPCtoECUO-R12SignalMap

112

12-Tx111-Tx0

Aligned MPO Adapter OPA-S-2-F

Type B (inverted) FOPC-02-02-XXX-12-01

Opposed MPO Adapter OPA-S-1-F

ECUO-T12

ECUO-R12

121

1-Rx0

12-Rx11

FOPCside a 12 fiber (b) side b

mpo position

fiber color

mpo position

1 blue 12

2 orange 11

3 green 10

4 brown 9

5 slate 8

6 white 7

7 red 6

8 black 5

9 yellow 4

10 violet 3

11 rose 2

12 aqua 1

ECUO-T12 signal map


mpo position

Tx0 blue 1

Tx1 orange 2

Tx2 green 3

Tx3 brown 4

Tx4 slate 5

Tx5 white 6

Tx6 red 7

Tx7 black 8

Tx8 yellow 9

Tx9 violet 10

Tx10 rose 11

Tx11 aqua 12

ECUO-R12 signal map


mpo position

Rx0 blue 1

Rx1 orange 2

Rx2 green 3

Rx3 brown 4

Rx4 slate 5

Rx5 white 6

Rx6 red 7

Rx7 black 8

Rx8 yellow 9

Rx9 violet 10

Rx10 rose 11

Rx11 aqua 12

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ItispossibletoachievethesameconnectivitywhenaTypeA(straightthrough)patchcableisused.Thisrequires theuseof twoopposedtypeMPOadapters.Figure9showsthedetailsof thisconfiguration.NotethatthisconfigurationwillalsoworkwithtwoalignedMPOadapters.

Figure9.ECUO-T12toFOPCtoECUO-R12SignalMap

112

12-Tx111-Tx0


Opposed MPO AdapterOPA-S-1-F

ECUO-T12

ECUO-R12

112

1-Rx0

12-Rx11

ECUO-T12 signal map


mpo position

Tx0 blue 1

Tx1 orange 2

Tx2 green 3

Tx3 brown 4

Tx4 slate 5

Tx5 white 6

Tx6 red 7

Tx7 black 8

Tx8 yellow 9

Tx9 violet 10

Tx10 rose 11

Tx11 aqua 12

ECUO-R12 signal map


mpo position

Rx0 blue 1

Rx1 orange 2

Rx2 green 3

Rx3 brown 4

Rx4 slate 5

Rx5 white 6

Rx6 red 7

Rx7 black 8

Rx8 yellow 9

Rx9 violet 10

Rx10 rose 11

Rx11 aqua 12

TYPE Aside a 12 fiber (a) side b

mpo position

fiber color

mpo position

1 blue 1

2 orange 2

3 green 3

4 brown 4

5 slate 5

6 white 6

7 red 7

8 black 8

9 yellow 9

10 violet 10

11 rose 11

12 aqua 12

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8 ECUO–Y12toECUO–Y12This section describes the back-to-back configuration for two ECUO –Y12 HOCs. Each –Y12 cablecontainsa12channelTxanda12channelRxjoinedtogetherina“Y”cable,andterminatedina24fiberMPOconnector.

Figure10shows thesignalmap forback-to-backoperationof these twoHOCs.Note thatanopposedMPO adapter is required. Following the signal flow, Tx on the left-hand cable connects to Rx on theright-handcable,andsoon,withallTxchannelsononecablebeingconnectedtothecorrespondingRxchannelontheothercable,andviceversa.


1- Rx0

ECUO-Y12

ECUO-Y12

24-Tx1113-Tx0

13-Tx024-Tx11

1-Rx012-Rx11

12-Rx11

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Figure10.ECUO-Y12toECUO-Y12SignalMap

ECUO-Y12 signal map


mpo position

Rx0 blue 1

Rx1 orange 2

Rx2 green 3

Rx3 brown 4

Rx4 slate 5

Rx5 white 6

Rx6 red 7

Rx7 black 8

Rx8 yellow 9

Rx9 violet 10

Rx10 rose 11

Rx11 aqua 12

Tx0 blue (+) 13

Tx1 orange (+) 14

Tx2 green (+) 15

Tx3 brown (+) 16

Tx4 slate (+) 17

Tx5 white (+) 18

Tx6 red (+) 19

Tx7 black (+) 20

Tx8 yellow (+) 21

Tx9 violet (+) 22

Tx10 rose (+) 23

Tx11 aqua (+) 24

RxTx

ECUO-Y12 signal map


mpo position

Rx0 blue (+) 1

Rx1 orange (+) 2

Rx2 green (+) 3

Rx3 brown (+) 4

Rx4 slate (+) 5

Rx5 white (+) 6

Rx6 red (+) 7

Rx7 black (+) 8

Rx8 yellow (+) 9

Rx9 violet (+) 10

Rx10 rose (+) 11

Rx11 aqua (+) 12

Tx0 blue 13

Tx1 orange 14

Tx2 green 15

Tx3 brown 16

Tx4 slate 17

Tx5 white 18

Tx6 red 19

Tx7 black 20

Tx8 yellow 21

Tx9 violet 22

Tx10 rose 23

Tx11 aqua 24

RxTx

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9 ECUO–Y12toFOPCtoECUO–Y12ThissectiondescribestheconfigurationwhentwoECUO–Y12half-cablesarejoinedusingaFOPC.Thesehalfcablesuse24fiberMPOconnectors.Aswasmentionedearlier,thisisacommonapplicationwhentheopticallinkmustbepassedthroughabulkheadateachcableend.

Figure11showsthesignalmapforthisconfiguration.NotethattwoalignedMPOadaptersareused.A24fiberFOPCisrequired.Tracingthesignalflowthroughthediagram,itisseenthatalltheTxchannelsononecableconnectwiththecorrespondingRxchannelontheothercable,andviceversa.PleasenotethatthisconfigurationwillalsoworkwithtwoopposedMPOadapters.


FOPC-02-02-XXX-24-01

24-Tx11

12-Rx111-

Rx0

13-Tx0

121

2413


1-Rx0

24-Tx11

12-Rx11

13-Tx0

ECUO-Y12 (24-Channel, Key Down)

121

2413

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Figure11.ECUO-Y12toFOPCtoECUO-Y12SignalMap

ECUO-Y12 signal map


mpo position

Rx0 blue 1

Rx1 orange 2

Rx2 green 3

Rx3 brown 4

Rx4 slate 5

Rx5 white 6

Rx6 red 7

Rx7 black 8

Rx8 yellow 9

Rx9 violet 10

Rx10 rose 11

Rx11 aqua 12

Tx0 blue (+) 13

Tx1 orange (+) 14

Tx2 green (+) 15

Tx3 brown (+) 16

Tx4 slate (+) 17

Tx5 white (+) 18

Tx6 red (+) 19

Tx7 black (+) 20

Tx8 yellow (+) 21

Tx9 violet (+) 22

Tx10 rose (+) 23

Tx11 aqua (+) 24

RxTx

ECUO-Y12 signal map


mpo position

Rx0 blue (+) 1

Rx1 orange (+) 2

Rx2 green (+) 3

Rx3 brown (+) 4

Rx4 slate (+) 5

Rx5 white (+) 6

Rx6 red (+) 7

Rx7 black (+) 8

Rx8 yellow (+) 9

Rx9 violet (+) 10

Rx10 rose (+) 11

Rx11 aqua (+) 12

Tx0 blue 13

Tx1 orange 14

Tx2 green 15

Tx3 brown 16

Tx4 slate 17

Tx5 white 18

Tx6 red 19

Tx7 black 20

Tx8 yellow 21

Tx9 violet 22

Tx10 rose 23

Tx11 aqua 24

RxTx

FOPCside a 24 fiber (c) side b

mpo position

fiber color

mpo position

1 blue 13

2 orange 14

3 green 15

4 brown 16

5 slate 17

6 white 18

7 red 19

8 black 20

9 yellow 21

10 violet 22

11 rose 23

12 aqua 24

13 blue (+) 1

14 orange (+) 2

15 green (+) 3

16 brown (+) 4

17 slate (+) 5

18 white (+) 6

19 red (+) 7

20 black (+) 8

21 yellow (+) 9

22 violet (+) 10

23 rose (+) 11

24 aqua (+) 12

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10 ECUO–B04toECUO–B04Thissectiondescribestheback-to-backconfigurationfortwoECUO–B044channelbidirectionalcables.Recallthateach–B04cableconsistsofa4channelfull-duplexopticalmodule,terminatedina12fiberMPOconnector.

Figure12showsthesignalmapforback-to-backoperationofthetwoHOCs.NotethatanalignedMPOadapter is required. Following the signal flow, Tx1 on the left-hand cable connects to Rx1 on theright-handcable,andsoon,withall4TxchannelsononecablebeingconnectedtothecorrespondingRxchannelontheothercable,andviceversa.Notethatonly8outof12channelsontheribbonfiberareused.

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Figure12.ECUO-B04toECUO-B04SignalMap

Aligned MPO Adapter OPA-S-2-F

ECUO-BO4

1-Rx0

12-Tx01-Rx0

12-Tx0

ECUO-BO4

ECUO-B04 signal map


mpo position

Rx0 blue 1

Rx1 orange 2

Rx2 green 3

Rx3 brown 4

Dark slate 5

Dark white 6

Dark red 7

Dark black 8

Tx3 yellow 9

Tx2 violet 10

Tx1 rose 11

Tx0 aqua 12

ECUO-B04 signal map


mpo position

Rx0 blue 1

Rx1 orange 2

Rx2 green 3

Rx3 brown 4

Dark slate 5

Dark white 6

Dark red 7

Dark black 8

Tx3 yellow 9

Tx2 violet 10

Tx1 rose 11

Tx0 aqua 12

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11 ECUO-B04toFOPCtoECUO-B04ThissectiondescribestheconfigurationwhentwoECUO–B04half-cablesarejoinedusingaFOPC.Thesehalf cables use 12 channelMPO connectors. Aswasmentioned earlier, this is a common applicationwhentheopticallinkmustbepassedthroughabulkheadateachcableend.

Figure13showsthesignalmapforthisconfiguration.NotethattwoopposedMPOadaptersareused.ATypeBFOPCisrequired.Tracingthesignalflowthroughthediagram,itisseenthatalltheTxchannelsononecableconnectwiththecorrespondingRxchannelontheothercable,andviceversa.PleasenotethatthisconfigurationwillalsoworkwithtwoalignedMPOadapters.

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Figure13.ECUO-B04toFOPCtoECUO-B04SignalMap

121

12-Tx01-Rx0


FOPC-02-02-XXX-12-01


ECUO-BO4

ECUO-BO4

12 1

1-Rx0

12-Tx0


mpo position

fiber color

mpo position

1 blue 12

2 orange 11

3 green 10

4 brown 9

5 slate 8

6 white 7

7 red 6

8 black 5

9 yellow 4

10 violet 3

11 rose 2

12 aqua 1

ECUO-B04 signal map


mpo position

Rx0 blue 1

Rx1 orange 2

Rx2 green 3

Rx3 brown 4

Dark slate 5

Dark white 6

Dark red 7

Dark black 8

Tx3 yellow 9

Tx2 violet 10

Tx1 rose 11

Tx0 aqua 12

ECUO-B04 signal map


mpo position

Rx0 blue 1

Rx1 orange 2

Rx2 green 3

Rx3 brown 4

Dark slate 5

Dark white 6

Dark red 7

Dark black 8

Tx3 yellow 9

Tx2 violet 10

Tx1 rose 11

Tx0 aqua 12

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12 ECUO-B04toMimicaQSFP+PluggableModuleQuad Small Form Factor Pluggable (QSFP+) optical modules provide four duplex channels at up to14Gbpsperchannel.TheQSFP+moduleplugsintoapanelmountedcage,whichcontainsaconnectorthatinterfacestothehostPCB.CertainapplicationsmayrequiretheFireFlyECUO-B04moduletomimicaQuadSmallFormFactor(QSFP+)opticalmoduleatthepanel.Forexample,theFireFly–B04moduleneedstoconnecttoaremotesystemcontainingaQSFP+module.ConnectingtheFireFlyB04moduletoanopposedMPOadapterwillmimicaQSFP+module.Figure14showsthesignalmap.

Figure14.ECUO-B04toMimicaQSFP+PluggableModule

ECUO-B04

1-Rx0

12-Tx0


ECUO-B04 with 12-Channel MPO+

Opposed MPO Adapter

Fiber Number: 12 11 10 9 ... 4 3 2 1

Transmit Channels: 0 1 2 3 Receive Channels: 3 2 1 0

ECUO-B04 signal map


mpo position

Rx0 blue 1

Rx1 orange 2

Rx2 green 3

Rx3 brown 4

Dark slate 5

Dark white 6

Dark red 7

Dark black 8

Tx3 yellow 9

Tx2 violet 10

Tx1 rose 11

Tx0 aqua 12

27

13 ECUO-B04toFOPCtoQSFP+PluggableModuleTheQSFP+moduleisdescribedinSection12.CertainapplicationsmayrequirethattheFireFlyB04modulebeconnectedtoaremoteQSFP+module,throughaFOPC.Figure15showsthesignalmapforthisconfiguration.

28

a¸

Figure15.ECUO-B04toFOPCtoQSFP+PluggableModule

ECUO-B04

1-Rx0

12-Tx0


Fiber Number: 12 11 10 9 ... 4 3 2 1

Transmit Channels: 0 1 2 3Receive Channels: 3 2 1 0

FOPC-02-02-XXX-12-01

121

ECUO-B04 signal map


mpo position

Rx0 blue 1

Rx1 orange 2

Rx2 green 3

Rx3 brown 4

Dark slate 5

Dark white 6

Dark red 7

Dark black 8

Tx3 yellow 9

Tx2 violet 10

Tx1 rose 11

Tx0 aqua 12


mpo position

fiber color

mpo position

1 blue 12

2 orange 11

3 green 10

4 brown 9

5 slate 8

6 white 7

7 red 6

8 black 5

9 yellow 4

10 violet 3

11 rose 2

12 aqua 1

29

14 References[1]https://www.samtec.com/optics/optical-cable/mid-board

[2]Samtec:FireFly™Optical14Gx12DataSheet

[3]Samtec:FireFly™Optical14Gx4DataSheet

[4]PCIExpress®ExternalCablingSpecification,Revision2.0

30

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