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Abstract: This work proposes a full-duplex 60-GHz Radio-over-Fiber Orthogonal-Frequency-Division-Multiplexing (ROF-OFDM) system employing a frequency quintupling optical up-conversion scheme. To avoid the subcarrier signal beat interference (SSBI) due to dispersion-induced fading, a modified single sideband modulation scheme is proposed for the 10-Gbps QPSK-OFDM down-link signal. The power penalty of less than 2-dB was observed after a 50-km single mode fiber (SMF) and 4m wireless transmission. Wavelength reuse with a 1.25-Gbps OOK for up-link transmission is also demonstrated with a receiver penalty of less than 0.5-dB following 50-km SMF transmission. [Copyright &y& Elsevier]

Abstract: A full-duplex radio-over-fiber system using frequency-decupling optical millimeter-wave based on external modulation via a Mach–Zehnder modulator is proposed and analyzed theoretically. The simulation results show that the power penalties for both the downstream and upstream signals are less than 0.5dB. In this scheme, the configuration of a base station is simplified due to no laser at a base station, and the frequency of local oscillator signal is largely reduced due to the frequency-decupling millimeter-wave technique. The costs of central office and base station are largely reduced. [Copyright &y& Elsevier]