1. TASK Academic Computer Center Mścisław Nakonieczny, mnak@task.gda.pl Sławomir Połomski, sp@task.gda.pl 7 VI 2004 - Gdańsk, Poland

2. Agenda n n ACC TASK n n xWDM project at TASK – – CWDM – – Passive optics: splitters, circulators – – Economy of our solution – – Future: 10GE, EPON

3. ACC TASK n n Supercomputer Division – – 256 Itanium processors based cluster – – 128 Xeon cluster, SGI, SUN n n Network Division – – MAN in Gdańsk region – – 140km of fiber optic cables – since ’93 to ’97 – – ATM, GE backbone – – 50 000 users

4. Map n n 140km of own fibers n n ATM, GE

5. TASK’s backbone

6. Project WDM at TASK n n CWDM n n Passive optics: splitters, circulators n n Economy of our solution n n Future: 10GE, wideband circulator, EPON Our goal – multiply fiber strands for a new GE/10GE backbone and schools in access layer

7. Our pilot CWDM network

8. Passive CWDM n n 4,8,16 lambdas - n n Difficult to integrate ATM&TDM with passive OADM -  n n Costs -  n n Support for 10GE ?

9. Second solution – passive optics n n Idea of FBT coupler n n Idea of Circulator

10. What is a FBT coupler ? FBT - Fused Biconical Taper

11. FBT coupling ratio Coupling ratio as a function of pull length for a fused biconical taper coupler made of identical fibres

12. Fiber optic circulator A fiber optic circulator is a passive device which transports an optical signal from one port to the next port, only in one direction (i.e. 1 to 2, or 2 to 3).

13. Single-fiber bidirectional link

14. Link reflections

15. TASK’s access link realization using standard 50/50 wideband couplers

16. TASK’s access link realization using standard 50/50 and WDM couplers and two bidirectional transmissions within a single fiber One fiber 1310/1550 User 1 (1310nm) User 2 (1550nm) 1550 1310 1550 1310 1310/1550 1310 1550 1310/1550 bidirectional Wideband Coupler 50/50 1310 1550 WDM Coupler 1310/1550 Wideband Coupler 50/50 WDM Coupler 1310/1550 WDM Coupler 1310/1550 WDM Coupler 1310/1550

17. Our handmade FBT WDM

18. Comparison of costs CWDM & FBT CWDM 4 lambdasMUX/DEMUX 4 channel2800 Coloured GBICs16000 4700 €/line FBT 2 linesAccess line 1 2 std. couplers + 2 GBICs 360 €/line 2 lines / 2 lambdasAccess line 2 User1 2 WDM couplers + 2 GBICs540 User2 2 WDM couplers + 2 GBICs 1550nm2840 2 std. couplers240 1810 €/line

19. EPON downstream

20. EPON upstream

21. Summary Single fiber solutions based on passive optics multiply capacity of optics layer and are very cost attractive

22. Links n n ACC TASK http://www.task.gda.pl n n Ethernet in the First Mile IEEE802.3ah Study group http://www.ieee802.org/3/efm/index.html

23. Thank You Thank You