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A regenerative optical grooming switch for interconnecting 100 Gbit/s networks with lower bit-rate networks and switching functionality in time, space and wavelength domain is demonstrated. Lab and field demonstrations show the feasibility of the new concept. Q-factors above 20 dB are reported. Future transparent networks should provide transparent interconnection of networks operating at different speed. This actually means that there is a need for grooming switches and routers, i.e. edge-switches and routers that are not only able to switch or route traffic but are as well able to aggregate traffic from one network at one speed onto a new network at another speed.
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