Optical multipath RF self-interference cancellation (SIC) based on phase modulation for full-duplex communication is proposed and demonstrated experimentally. Phase modulation is utilized to convert the RF signal into optical domain, in which the time delay tuning, amplitude tuning and phase inversion for multipath RF SIC are completed. The comprehensive theoretical model of the optical multipath RF SIC system is established, and the factors affecting SIC performance including the time delay, amplitude and phase deviations are analyzed. The experimental results verify the feasibility of the proposed scheme for full-duplex communication with the cancellation depth of 26 dB and 28 dB over 100 MHz at central frequency of 6 GHz and 10 GHz, respectively. A figure of merit of the maximum interference to signal of interest ratio is defined to characterize the SOI recovery capability of optical RF SIC system.

中文翻译：

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基于相位调制的全双工通信光多径射频自干扰消除

提出并实验证明了基于相位调制的光多径射频自干扰消除 (SIC) 用于全双工通信。利用相位调制将射频信号转换为光域，完成多径射频SIC的时延调谐、幅度调谐和反相。建立了光多径射频SIC系统的综合理论模型，分析了影响SIC性能的时延、幅度和相位偏差等因素。实验结果验证了所提出的全双工通信方案的可行性，在 6 GHz 和 10 GHz 的中心频率下，在 100 MHz 上的消除深度分别为 26 dB 和 28 dB。