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Reconfigurable optical add/drop multiplexers (ROADMs) are key elements in operators' backbone networks. The breakthrough node concept of Architecture on Demand (AoD) permits to design optical nodes with higher flexibility with respect to ROADMs. In this work, we present a five-step algorithm to design AoD instances according to some given traffic requests, able to support from sub-wavelength time-switching up to wavelength/superchannel/fiber switching. We evaluate AoD performance in terms of power consumption and number of backplane optical cross-connections. Furthermore, we discuss trade-offs involved in the migration from fixed to flexible grid with regard to the optical node size, capacity and power consumption. We compare several ROADM architectures proposed in the literature with AoD in terms of power consumption and cost. We also study different technologies to enhance the scalability of AoD. Results show that AoD can bring significant power savings compared to other architectures while offering a throughput of hundreds of Tb/s.

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