A datacenter for performing a service is provided. The datacenter is configured for receiving an optical signal comprising groups of wavelength bands, A1, A2, A3, . . . , AX, and B, X being an integer, the signal being associated with a request for a service to be executed by the datacenter, the datacenter being configured for executing the service and outputting the result of the service. The datacenter comprises at least one 1:N MD-WSS, having one common port and N tributary ports, where N is an integer and N>1, and a group of at least one server cluster, each comprising a respective transceiver configured to receive and transmit signals on at least some of the wavelength bands.