Split-band Wavelength Plans for 100G EPONgrouper.ieee.org/groups/802/3/ca/public/meeting_archive/... · 2016-09-16 · Split-band Wavelength Plans for 100G EPON Eugene (Yuxin) Dai

Split-bandWavelengthPlansfor100GEPON

Eugene(Yuxin)DaiCoxCommunicaEons

IEEE802.3ca100GEPONTFSeptember,2016

Ft.Worth,Texas,USA

Outline

•  Wavelengthplanandlinecode•  Splitbandwavelengthplans•  CommonorparEalcommonwavelengthplanwithNGPON2

2IEEE802.3ca100GEPONTaskForce

Wavelengthplanandlinecode

•  HistoricallyinPON,wavelengthplanandlinecodehavebeenconsideredindependently•  Atrate≤10Gbpswith20kmreach,dispersioncanbetolerated•  WideupstreamchannelintheObandusesuncooledDFBlasers•  NRZisthedefaultchoiceforlinecode

•  Whentransmissionrates>10Gbps,dispersionsmayhavetobecompensatedfor.PMDeffectswillbenoEceable

•  StarEngfromNG-PON2,WDMisintroducedinPON•  MaynotbefeasibletoputallchannelsinObandduetowavelength

resourceslimitaEons,FWM,andcoexistencerequirements

•  Somelinecodesaremoretolerantwithdispersions.Therefore,thewavelengthplanneedstobeconsideredwithlinecodes


LinecodechoiceforOband*

•  NRZoutperformsDuobinaryat25Gbpswith20kmreach•  OpEmumlinecodeforObandisNRZ

4

OBandBERversusFiberlength(25Gbps,fixedTXpower)

1.0E-17

1.0E-15

1.0E-13

1.0E-11

1.0E-09

1.0E-07

1.0E-05

1.0E-03

1.0E-01

0 10 20 30 40 50 60

NRZ

Duobinary

km BE

R

*Dispersionof2ps/nm/kmwasusedinthesimulaSon

IEEE802.3ca100GEPONTaskForce

LinecodechoiceforC*/Lband

5

1.00E-07

1.00E-06

1.00E-05

1.00E-04

1.00E-03

1.00E-02

1.00E-01

1.00E+00 0 10 20 30 40 50 60

BER

km

NRZ

DUO_B

•  NeedsdispersioncompensaEonfor20kmreachinC/LbandforNRZ

•  DispersioncompensaEonmaybeavoidedbyusingDuobinary•  OpEmizedlinecodeforC/LbandsisDuobinary

CbandBERversusfiberlength(25Gbps,fixedRXpower)

*Dispersionof16ps/nm/kmwasusedinthesimulaSon


AdvancedmodulaEonsordispersioncompensaEon?

•  DispersiontolerantadvancedmodulaEons,suchasDuobinaryandPAM,willeventuallybeusedfortransmissionrates≥25Gbps

•  Ata25Gbpsrate,dispersioncompensaEoncanbeavoidedbyusingObandchannels,howevertheremaynotbeenoughObandspectraforWDMchannels

•  InordertouseCorLbands,eitherdispersioncompensaEonoradvancedmodulaEonhastobeconsidered

•  ThequesEonisthatshouldweconsideradvancedmodulaEonordispersioncompensaEonwithNRZ?

•  Atthismoment,themainstreamgroupseemstopreferNRZ,thatputsdispersioncompensaEonintothepictureforC/Lband


ChoicesofWavelengths

•  Obandisthebestchoiceforsinglechannel25GbpswithNRZ•  SomeObandspectraarenotsuitableforWDMbecauseoflowdispersion

•  Moderatedispersions,forexample≥4ps/nm/km,areneededtosuppressFWMforWDM

0

0.3

0.6

0.9

1.2

1250 1300 1350 1400 1450 1500 1550 1600Wavelength(nm)

Agen

uaEo

n(dB/km

)

1650-10

0

10

20

Dispersion

(ps/nm

.km)

DispersionE O S C L

ModeratedispersiontosuppressFWM

IEEE802.3ca100GEPONTaskForce 7

HowtouseObandfor100GEPON?(1)

AvailableObandspectraforWDM:•  20nminnegaSvedispersionregion(1260nmto1280nm)areavailableforWDM,butalreadyusedby10GEPON

•  ~5nminposiSvedispersionregion(1345nmto1350nm)

8

-4

-3

-2

-1

0

1

2

3

4

1250 1260 1270 1280 1290 1300 1310 1320 1330 1340 1350 1360 1370

Waterpeak�10GEPONUS�

WDM�

WDM� λ(nm)�

Dispersion(ps/nm

/km)�

AvailableObandspectraforWDM*�

*Relaxed2ps/nm/kmdispersionforFWMsuppressing�


HowtouseObandfor100GEPON?(2)

•  10GEPONUSuncooledDFBlasershave20nmspectrarange.

•  EvenifSghteningitto8nmtoa10nmrangeandassumingusingthe20nm10GEPONspectra,therearesSllnotenoughWDMspectratoputallUSchannelsinObandandusinguncooledDFBlasers

•  IfObandisusedinsomeway,forexamplenarrowerWDMorsinglepairfor25Gbpschannel,splitbandwavelengthplanesareneeded


Split-bandwavelengthplan*ingeneral

10

•  US:1280nmto1360nmrange,avoidzerodispersionregion•  DS:Lbandin1590nmto1610nm,orCbandin1524nmto1544nm,reusingNG-PON2spectrumallocaEons

•  Coexistswith10GEPON•  Thereareseveralsplit-bandarchitectures

1260nm 1280nm 1360nm

10G EPON US 1270+/-10nm

1480nm - 1500nm

EPON/GPON DS 1490+/-10nm

1575nm - 1581nm

10G EPON DS 1577-2/+3 nm XGPON 1578 -2/+3 nm

1590nm - 1610nm

1550nm - 1560nm

RF video

NG-PON2US

1524nm-1544nm

100GEPONUS

100GEPONDS

*OpSonAinngepon_1511_dai_1.pdf


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AsymmetricDispersionCompensaSon(1)•  AllupstreamchannelsareinOband•  AsymmetricdispersioncompensaEon(DC)isneededforDSinSplitO/L

bandorO/Cbandwavelengthplan•  OnlyneedtocompensatedispersionstotherangeneededforWDM

100GOLT

TX

TX TX

TX

RX

RX RX

RX

100GMAC

DCF EDFA/SOA

Dispersion(ps/nm/km)� -49.0to-33.0�

DispersionSlope(ps/nm2/km)� -0.155�

Effec:veArea(µm2)� 27�

A@enua:on(dB,at1550nm))� 0.256�

DCF38

•  5kmDCFisneededtocompensatethedispersionof20kmSFMto~6ps/nm/km•  AnEDFA/SOAisneededtocompensateaddiEonallossesofDCFandfiltersinDS•  IntheUS,anSOAmaybeneededtocompensateforthelossoftheaddiEonal

filter

?

C/Lband

Oband


12

AsymmetricDispersionCompensaSon(2)

•  ThebenefitofthesplitO/LorO/CbandwavelengthplanistokeepallupstreamchannelsinObandtoavoiddispersioncompensaEonintheupstream

•  AllUSchannelsinObandispossibleonlyifcoexistencewith10GEPONisnotrequired

•  AllupstreaminObandmaybepossibleiffurtherrelaxdispersioncriteriaforsuppressingFWMisfeasible


13

AsymmetricDispersionCompensaSon(3)

•  ThedrawbackofallupstreaminObandisthe“asymmetric”waytocompensatedispersions

•  ThehiddenassumpEonisthatwithoutUSdispensaEoncompensaEonthecostofanONUwillbelower•  UncooledDFBlaser

•  NeedlargeWDMspectrainOband•  NoSOAisneedatONU

•  AnOAmaybeneededatOLTaspreamplifierandsharedbyallONUs.


14

SymmetricDispersionCompensaSon(1)•  AllDSandUSchannelsintheCand/orLband•  SymmetricdispersioncompensaEon,theDFCisplacedatthecommon

partoftheODN•  ItcompensatesthedispersionsforbothUSandDS

100GOLT

TX

TX TX

TX

RX

RX RX

RX

100GMAC

DCF

EDFA Dispersion(ps/nm/km)� -49.0to-33.0�

DispersionSlope(ps/nm2/km)� -0.155�

Effec:veArea(µm2)� 27�

A@enua:on(dB,at1550nm))� 0.256�

DCF38

•  5kmDCFisneededtocompensatethedispersionof20kmSFMto~6ps/nm/km

Lband

Cband


15

SymmetricDispersionCompensaSon(2)

•  ThebenefitofsymmetricdispersioncompensaEonisthattheUSchannelsandDSstreamchannelaretreatedthesameway

•  SymmetricdispersioncompensaEonrequiresallocaEonofUSandDSchannelsinCbandand/orLband

•  ItenablesreuseofNG-PON2spectratoconservewavelengthresources

•  IfUSchoosesCbandandDSinLbandasinNG-PON2,itissEllconsideredasasplitbandwavelengthplan

•  ThedrawbackisthatcooledDFBlasersmaybeneeded•  Itmaybeacceptedfor100GONUssincetheyare

consideredbusinessONUs•  Thecostofthe1st25Gchannelwillbehigher


Splitbandwavelengthplan–reuseNG-PON2wavelengthplan

16

•  100GEPONUS:Cband1524nmto1544nm•  100GEPONDS:Lband1590nmto1603nm•  5nmspectraperchannel,cooledDFBlasersmaybeneeded•  WDMcoexistswith10GEPON

1260 1280nm 1360nm

10G EPON US 1270+/-10nm

1480nm - 1500nm

EPON/GPON DS 1490+/-10nm

1575nm - 1581nm

10G EPON DS 1577-2/+3 nm XGPON 1578 -2/+3 nm

1590nm - 1610nm

1550nm - 1560nm

RF video

100GEPONUS

1524nm-1544nm

100GEPONDS

1340nm


CommonWavelengthPlanwithNGPON2

17

• AcommonorparEclecommonwavelengthplanwithNGPON2conserveswavelengthresources

• AcommonwavelengthplaninC/LbandsfacilitatesmigraEontoWDMPONinthefuture

• NGPON2reservesC-band1524nmto1544nmforupstreamandL-band1596nmto1603nmfordownstream,1610nm–1625nmforP2PWDM


The1st25Gbpssinglechannel

18

ITU-TPONEmeline

1998 2000 2002 2004 2006 2008 2010 2012 2014 2016

•  FSAN/ITU-Tcompleted4ch(4X10G)NG-PON2(basicconfiguraSon)in2015

•  Realizedtheneedsforsinglechannelsymmetric10Grates,FSAN/ITU-Tadds10G/10GXGSPONin2016

AlthoughmulE-channelPONisfeasible/available,itcannotreplacetheneedsoflowcostsinglechannelPON

GPON2.5G

XGPON10G/2.5G

NG-PON2WDM40G

XGSPON10G/10G


AHistoricalviewofPONdeployment

19

PONFieldDeployment

1998 2000 2002 2004 2006 2008 2010 2012 2014 2016EPON

10GEPONBPON GPON

•  Anaccessnetworkratewilllastformanyyears.•  GPONhasbeendeployingsince2006(>16years),andissSlldeployingtoday.•  10GEPONhasbeendeployingsince2010(6years),thevolumeissSllsmall.

Therefore,10GEPONsSllhasseveralyearstoreachitspeak(another10years?)

•  When25GPONstartstodeploy,weexpectthattherewillbemanyyears(10?)for25Gb/sEPONreachitspeakbeforethenoEceable100GEPONdeploymentbegins(forbusiness?)

•  DuringthislongEmeperiodlowcostfor25GEPONiscriEcal.IEEE802.3ca100GEPONTaskForce

20

Theeconomicsofthe1st25GEPONchannel

•  InO/L,O/CorC/L,split-bandarchitectures,the1st25GchannelsneeddispensaEoncompensaEon

•  AnEDFA/SOAisneededinthedownstream

1st25GOLT

25GTX

TX TX

TX

RX

RX RX

RX

DCF EDFA/SOA

•  Thecostofthe1st25Gchannelwillbehigh•  Some25Gdeploymentsmayneverupgradeto100G•  Bearingthecostof100Ginthose25Gdeploymenthasnobusiness

value IEEE802.3ca100GEPONTaskForce

21

ThebalancedwavelengthplansoluEon*

•  100GchannelsinC/LbandalignwithNG-PON2spectrum

•  Standalone25GchannelinO/ObandwithoutOA

•  ThereareenoughspectraforO/Oband25Gchannel

•  The1st25GchannelusesuncooledDBFlaser

•  Thestandalone25GchannelWDMoverlaywith100GchannelsformigraEoninthefuture,ifneeded.

•  NG-PON2spectraarereusedtoconservewavelengthresources

100GOLT

TX

TX TX

TX

RX

RX RX

RX

100GMAC

DCF

EDFA/SOA

25GMAC TX/RX

Oband/Oband

C/Lbands

25GMAC TX/RX

SMF

SMF

25Gchanneland100Gchannelscanscaleseparatelyforeconomicandgrowthtogetherifneeded

*Alsocalled1+4


22

SplitO/OandC/Lbandwavelengthplan*

AslightvariaEonofthepreviousarchitecture:

•  3channelsareinC/LbandandalignwithNG-PON2spectra

•  The25GchannelisinO/Oband•  The25Gchannelusesuncooled

DBFlaser•  ThedrawbackisaddiEonalOAis

neededforthe25Gchannel•  Thewavelengthfilteringscheme

ismorecomplicated,whichcouldincreasethecostofONUs

100GOLT

TX

TX TX

RX

RX RX

100GMAC

DCF

EDFA/SOA

TX/RX Oband/Oband

C/Lbands SMF

*Alsoreferredas1+3


Split-bandwavelengthplans


1st 25G Channel Wavelngth band Centrer wavelength Dispersion distribution-6 1.3 , /.40 43 43 43 5 6 43 23+5 4 1.3 , /.40 43 43 43 5 6 43 23

3 C/L band Channels Wavelngth band Centrer wavelength Dispersion

0 519 - 21 9 137 6

9 9 9 9 9 9 9 89

. 519 / 21 9 137 6

, 9 9 ,, 9 9

9 9 + 9 89

4 C/L band Channels Wavelngth band Centrer wavelength Dispersion

1 62 . 32 5 248 7

9

/ 62 0 32 5 248 7

-+ --

, 9

CenterwavelengthandrangeareforthepurposeofchannelresourcesesSmate

“1+3”or“1+4”?

•  TherearesomecommonaliEesanddifferencesin“1+3”and“1+4”underthesplit-bandarchitecturesbeendiscussed

•  The“1+4”underthesplit-bandarchitecturehaslowestcostforthe1st25Gchannel

•  The“1+3”underthesplit-bandarchitectureneedanaddiEonalOAforthe1st25Gupstreamchannel

•  ThecostofC/Lbandchannelsin“1+3”and“1+4”aresimilar

•  The“1+4”split-bandarchitectureallows25Gand100Gchannelsscaleseparately


AllObandUSWDMwavelengthplan

-4

-3

-2

-1

0

1

2

3

4

1260 1270 1280 1290 1300 1310 1320 1330 1340 1350 1360 1370

λ(nm)

Dispersion(ps/nm/km

)

0dispersionzone

Waterpeak 10GEPONUS

OBandWDMwavelengthresource(1ps/nm/kmrule)

1st25Gchannel:1280nm+/-5nm

2nd,3rdand4thchannels:1335nm-1350nmwith5nmchannelspacing

Upstream channel Centrer wavelength/range+. 11-/ 10 10+. 11-/ 10 10+. 11-/ 10 10+. 11-/ 10 10

10nm

~15nm

CenterwavelengthandrangeareforthepurposeofchannelresourcesesSmate

AdvancedmodulaEons

•  DispersiontolerantadvancedmodulaEons,suchasDuobinary,couldbeusedtoavoidtheneedsfordispersioncompensaEonsat25Gbpswith20kmreach

•  Theoverallarchitecturesoftheabovediscussedsplit-bandsoluEonswillnotbeaffectedbyusingadvancedmodulaEons,exceptthefilterarrangementmaybedifferent.

•  Thesplit-bandwavelengthplansremainunchangedifadvancedmodulaEonsareused.


Conclusions•  Acommon(orparEalcommon)wavelengthplanwithNG-PON2conserveswavelengthresources

•  Theproposedsplitbandarchitecturesplacethe1st25GinO/ObandwidechannelsresulEnglowercostforthe25Gchannel

•  Other3(in“1+3”)or4(in“1+4”)channelsareinC/Lbandandhavesimilarcoststructures

•  The“1+4”insplit-bandarchitecturehaslowestcostforthe1st25Gchannel

•  AdvancedmodulaEonscouldbeusedtoavoidDCF.Thesplit-bandarchitectureswillnotbeaffectedbyusingadvancedmodulaEons


28

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Documents

Split-band Wavelength Plans for 100G EPONgrouper.ieee.org/groups/802/3/ca/public/meeting_archive/... · 2016-09-16 · Split-band Wavelength Plans for 100G EPON Eugene (Yuxin) Dai