| A broadband 30-GHz-band radio over fiber (RoF) transmission system has been investigated by using a combination of novel techniques in this thesis. Our efforts focus on star-tree architecture as well as bus architecture connecting remote antenna base stations (BSs) to a central control office (CO) by incorporating OTSSB, SCM, DWDM and frequency-downshifting schemes. These schemes allow the sharing equipment at the CO and therefore enable simple radio distribution architecture to be implemented.; In this thesis, we have shown that chromatic dispersion can be almost overcome by implementing a simple method using the dual electrode MZM modulation. An important issue related to maximizing spectral utilization in millimeter-waved-band RoF system has been solved by using wavelength-interleaving DWDM technique incorporating OTSSB modulation. Novel WI-Mux, WI-DeMux and WI-OADM, which are the critical components in wavelength-interleaved DWDM system, have also been studied. Moreover, we have demonstrated a 30-GHz full-duplex RoF network using only a signal light source from CO. In this configuration, BSs are simplified by removing local light sources. In uplink, in addition, a novel technique, frequency-downshifting technique, is used for channel selection and frequency downconversion without electrical frequency downconverter. The principle underlying this novel technique is explained theoretically. (Abstract shortened by UMI.)... |
