Table 1: The comparison of different carrier communication characteristics.

CarrierMicrowave THz Optical
communicationcommunicationcommunication

Transmission modeWireless networksWireless networksWired networks
Transmission distanceLong rangeVisual rangeUltra-long range
Message capacityMbit/sBetweenGbit/s
DirectionalityBadBetweenFine
SecurityLowLow-radiationHigh photon energy