Methods for tuning a transmitter to a selected wavelength are disclosed. The method includes graphically displaying at least one source device; graphically displaying at least one target device; graphically displaying a first data path between at least one source device and at least one target device; and in response to a failure in the first data path: graphically indicating the failure in the first data path; and graphically displaying a failover data path. The radio unit is equipped with radiation detector 8, electronic amplifier 7 and interface 10 connected to the processor 1.