TASK Academic Computer Center Mcisaw Nakonieczny mnaktask gda

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

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

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

Map n 140 km of own fibers n ATM, GE

TASK’s backbone

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

Our pilot CWDM network

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

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

What is a FBT coupler ? FBT - Fused Biconical Taper

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

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).

Single-fiber bidirectional link

Link reflections

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

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

Our handmade FBT WDM

Comparison of costs CWDM & FBT CWDM 4 lambdas FBT 2 lines / 2 lambdas MUX/DEMUX 4 channel Coloured GBICs Access line 1 2 std. couplers + 2 GBICs Access line 2 User 1 2 WDM couplers + 2 GBICs User 2 2 WDM couplers + 2 GBICs 1550 nm 2 std. couplers 2800 16000 4700 €/line 360 €/line 540 2840 240 1810 €/line

EPON downstream

EPON upstream

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

Links n ACC TASK http: //www. task. gda. pl n Ethernet in the First Mile IEEE 802. 3 ah Study group http: //www. ieee 802. org/3/efm/index. html

Thank You