说明：  Radio-over-Fibre Technology for Broadband Wireless Communication Systems
(The research in this thesis focussed on the feasibility of using both single-mode and multimode fibres to distribute high-frequency microwave signals to simplified remote radio antenna units. An alternative radio-over-fibre technique, termed Optical Frequency Multiplication (OFM) has been investigated. OFM entails the periodic filtering of a swept optical signal at the headend followed by photodetection at the radio access unit. A low sweep frequency (e.g. 3 GHz) is used. After photodetection at the remote radio access unit, high-frequency (>21 GHz) harmonic components of the sweep signal are generated. The desired microwave signal is selected by means of bandpass filtering, amplified, and radiated by the antenna. Modulated microwave carriers are generated by intensity modulating the frequency-swept optical signal. )