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Abstract:The European Union ACTS project SONATA will define and' demonstrate a cswitchlessn all-optical network to provide a future single-layer, advanced transport architecture on a national scale. The single-hop, sharedaccess network employs time and wavelength agility (a WDMA/TDMA protocol), using fast tunable transmitters and receivers to route individual customer connections as well as bandwidth pipes through a single wavelength router (suitably replicated for resilience). No electronic switching nodes or cross-connects (telephony, IP, ATM, SDH) are required within the transport network, nor optical cross-connects (save the wavelength routing node), thus providing major transport architecture simplifications and hardware reductions. The network is scalable to 200 Tbit/s throughput over 1,000 krn, connecting 20 million terminals operating at 622 Mbit/s over 50.000-way split c

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