Transmission of 60 GHz wired/wireless based on full-duplex radio-over-fibre using dual-sextupling frequency

A novel full-duplex radio-over-fibre dual-sextupling frequency system with thin-film filter (TFF) was proposed and simultaneously demonstrated. A light wave generated by a distribution feedback laser diode (DFB-LD) is modulated by an RF signal to generate optical sidebands. This system used a dual-drive LiNbO3 Mach-Zehnder modulator (DD-LN-MZM) and an optical TFF to generate dual-sextupling frequency optical millimetre waves. The optical millimetre waves were carrying downstream signals to transmit through optical fibres to the two-base stations (BSs). Upstream signals were transmitted in the same optical fibres by using a circulator. The simulation results revealed that the power penalties for the downstream and upstream signals of both BSs are less than 0.6-dB. One of the sidebands in the BSs was used as a carrier for uplink connection. The laser diodes can be used instead of uplink sidebands in order to reduce the cost of the BSs. Also the users can pay less for the expensive laser diodes. The cost of the new system is largely reduced.