anage olors for 100Gb/s EPON Yuxin (Eugene) Dai ox ommunica?ons IEEE Interim mee?ng 100G EPON TF, January 2016 tlanta G, US
Outline Wavelength Broadcast WD-TD PON Wavelength Select WD-TD PON olor management Pay-as-grow of 25G EPON with WB WD- TD PON 2
Wavelength Select WD PON OLT Power coupler WG WG (a) Wavelength selected by common filter Power coupler (b) Wavelength selected by tunable filter Tunable Tunable Wavelength is selected by filters Low cost op?cs olor s Wavelength is selected by tunable op?cs olorless s NG-PON2 is build upon WS-WD PON High cost tunable op?cs 3
olor management in WS WD-PON olor is managed by fixed common filters or tunable filters Fixed common filters result in color Tunable filters result in colorless olorless is considered as a general requirement However tunable optcs for has consequences: High cost of tunable laser and tunable filter The complicaton of tuning protocols; may need out-of-band signing IntegraTon issues of tunable laser and tunable filter The limitaton of tuning range Limits how many channels can be covered Require DWD grade Form low cost prospectve it is not a preferred choice for EPON 4
WS WD-TD PON (NG-PON2) OLT I O P T T T P D P D P D Λ 1 λ 2 λ n Λ n WG λ n λn Tunable filter Tunable filter Λ 1 Tunable Λ n Tunable λ n Hybrid WS-WD PON and TD PON No wavelength domain scheduling besides inital wavelength setup Data traffic is scheduled in TD domain aximal data rate = channel rate hannel aggregaton instead of channel bonding
Wavelength Broadcast WD PON OLT WG No wavelength selec?on; wavelengths are broadcast to all s Low cost op?cs; but less flexible It could support mixed genera?on at the cost of efficiency or complexity 6
Wavelength Broadcast WD and Ethernet Parallel WD with fixed colors are used recently in high-speed Ethernet 40G, 100G and 400G Ethernet all use parallel WD with fixed wavelength Parallel WD with fixed colors is WB-WD, if used in PON it will be WB-WD PON The advantage of fixed wavelength WD is low cost optcs which is essental for Ethernet The potental problems are lack of flexibility and color management 7
WB WD-TD PON (100Gb/s EPON) Λ 1 T D Λ 1 λ n λ 2 Λ n WD λ n λ n 1 1 n n λ n 1 1 n n Λ n Hybrid WB-WD PON and TD PON No wavelength setup is needed Data traffic is normally scheduled in TD domain hannel bonding could be at RS or layers With channel bonding the aximal Data Rate = n x channel rate
olor management in WB WD-PON In WB-WD, colors are fixed, and broadcast to all s n receives all the wavelengths; and all wavelengths can be bonded together, such as in 100Gb/s, there is no need for color management However, if generatons are involved, there is a need to manage colors 100G EPON only consist 25Gb/s s ixed 25Gb/s, 50Gb/s, 75Gb/s and 100Gb/s s One soluton is using tunable optcs at : WS-WD The beher way is to manage colors within WB-WD with fixed optcs 9
100G EPON with 25Gb/s s in pay-as-grow XXVGII client 25G RS PS P PD Higher layers client client Logical ( bonding) ontrol 25G RS PS P PD WD 25G RS PS P PD client 25G RS PS P PD Pay-as-grow Deploy RED PON first 32 s, 25Gb/s Deploy YELLOW PON 2 nd 32 s, 25Gb/s Deploy BLUE PON 3 rd - 32 s, 25gb/s Deploy GREEN PON 4 th 32 s, 25Gb/s Total 100G capacity with 128 s olor management olorless s ostly tunable optcs and complicatons s with 4 colors How to manage colors? 10
anage colors by probability Higher layers client client client Logical ( bonding) client ontrol XXVGII 25G RS 25G RS 25G RS 25G RS PS P PD PS P PD PS P PD PS P PD WD 11
olor management with fixed wavelengths There are 4 types of 25Gb/s s with 4 colors Since there is no filters in the ODN, an with any color can be ahached any spliher port There is no color miss match problem in WB-WD PON (in contrast to WS-WD PON) olor can be managed by inventory management olor can be managed by probability VariaTons in color distributon only affect traffic balance among the 4 lanes during the deploying period 12
onclusions 100G EPON with 4 types of fixed wavelength s in a pay-as-grow model is feasible olor can be managed by probability or by inventory management The traffic in all 4 lanes will be balanced when the 100G EPON is fully loaded 13
Eugenedai@coxcom 14