同时同频全双工技术可有效提升频谱利用效率，然而射频自干扰是该技术实际应用必须解决的首要问题。建立了微波光子射频干扰消除理论模型，分析了幅度失配与时延失配对干扰消除深度的影响，基于现场可编程门阵列（Field Programmable Gate Array，FPGA）进行了微波光子射频干扰消除控制算法研究，建立了互相关算法与粒子群算法相结合的快速寻优算法，提出了综合考虑微波光子功能单元调节精度与模数转换器采样精度的算法判据。实验测试了基于FPGA的微波光子射频干扰消除算法自适应控制功能，在中心频率2.4 GHz，带宽40 MHz条件下，干扰消除深度达到35 dB。

针对带内全双工系统中的自干扰问题与有用信号的非线性失真问题，提出一种基于双偏振双驱动马赫曾德尔调制器的自干扰消除及线性度提升方案。包含有用信号和自干扰的接收信号注入该调制器的两个子双驱动马赫曾德尔调制器上臂的射频端口，构建的参考信号注入两个子调制器下臂的射频端口。两个子调制器被分别偏置在最大传输点和正交传输点，分别探测其输出光信号，得到两路电信号。当注入的参考信号和自干扰完全相同时，两路输出电信号中的自干扰可被完全消除。将这两路电信号采样后进行数字域联合处理，即可恢复出不含自干扰和非线性失真的有用信号。此外，提出了一种优化算法用于减少两路电信号功率不匹配导致的失真。通过仿真与实验验证该方案的可行性。实验结果表明，当有用信号为频率为10 MHz和12 MHz、功率为4 dBm的双音信号，自干扰为中心频率为11 MHz、符号率为4 Mbaud的正交相移键控信号时，该结构可以实现约25.6 dB的自干扰消除深度和17.3 dB的三阶交调抑制深度。

Radio frequency (RF) self-interference is a key issue for the application of in-band full-duplex communication in beyond fifth generation and sixth generation communications. Compared with electronic technology, photonic technology has the advantages of wide bandwidth and high tuning precision, exhibiting great potential to realize high interference cancellation depth over broad band. In this paper, a comprehensive overview of photonic enabled RF self-interference cancellation (SIC) is presented. The operation principle of photonic RF SIC is introduced, and the advances in implementing photonic RF SIC according to the realization mechanism of phase reversal are summarized. For further realistic applications, the multipath RF SIC and the integrated photonic RF SIC are also surveyed. Finally, the challenges and opportunities of photonic RF SIC technology are discussed.