Abstract
Radio over fiber (RoF) technology is considered a promising broadband technology especially when it merged with the large unused bandwidth of millimeter-wave (mm-wave) frequencies. Selecting an appropriate modulation format for mm-wave RoF system will specify the overall performance of the system. In this paper, we proposed using amplitude phase shift keying (APSK) digital modulation for mm-wave RoF system. APSK is considered an attractive modulation scheme for digital transmission over fiber due to the power and spectral efficiencies as well as its robustness against nonlinear distortions. In comparison to the other digital modulations, simulation results show that APSK achieved a low peak-to-average power ratio (PAPR) and very limited power loss compared to quadrature amplitude modulation (QAM). But the bit error rate (BER) shows that QAM modulation has a slightly lower BER than APSK for high signal-to-noise ratio (SNR).