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。

In-band full-duplex (IBFD) technology can double the spectrum utilization efficiency for wireless communications, and increase the data transmission rate of B5G and 6G networks and satellite communications. RF self-interference is the major challenge for the application of IBFD technology, which must be resolved. Compared with the conventional electronic method, the photonic self-interference cancellation (PSIC) technique has the advantages of wide bandwidth, high amplitude and time delay tuning precision, and immunity to electromagnetic interference. Integrating the PSIC system on chip can effectively reduce the size, weight, and power consumption and meet the application requirement, especially for mobile terminals and small satellite payloads. In this paper, the silicon integrated PSIC chip is presented first and demonstrated for IBFD communication. The integrated PSIC chip comprises function units including phase modulation, time delay and amplitude tuning, sideband filtering, and photodetection, which complete the matching conditions for RF self-interference cancellation. Over the wide frequency range of C, X, Ku, and K bands, from 5 GHz to 25 GHz, a cancellation depth of more than 20 dB is achieved with the narrowest bandwidth of 140 MHz. A maximum bandwidth of 630 MHz is obtained at a center frequency of 10 GHz. The full-duplex communication experiment at Ku-band by using the PSIC chip is carried out. Cancellation depths of 24.9 dB and 26.6 dB are measured for a bandwidth of 100 MHz at central frequencies of 12.4 GHz and 14.2 GHz, respectively, and the signal of interest (SOI) with 16-quadrature amplitude modulation is recovered successfully. The factors affecting the cancellation depth and maximum interference to the SOI ratio are investigated in detail. The performances of the integrated PSIC system including link gain, noise figure, receiving sensitivity, and spurious free dynamic range are characterized.

传统基于单个固定折射率透镜和渐变式折射率透镜制备光纤阵列准直器的方法，存在阵元数扩展困难、封装工艺复杂且集成化困难等缺点。利用光学微透镜易阵列化且阵元特性一致性好等优点，提出了基于平凸微透镜阵列制备光纤阵列准直器的方法。根据高斯光学和矩阵光学理论，对光纤阵列准直器的准直特性进行了理论分析和仿真，确定了光纤阵列准直器的相关设计参数，据此加工制备了四阵元一维排布光纤阵列准直器，其阵元间距为250 μm。通过远场光斑法对光纤阵列准直器的主要性能参数远场发散角进行了测量，并采用蒙特卡洛法对测量不确定度进行了分析与评定。光纤阵列准直器各通道远场发散角的测量值分别为0.69°，0.67°，0.71°，0.68°，测量扩展不确定度为0.02°，该测量结果在设计容差（0.68±0.03）°之内。该光纤阵列准直器具有良好的准直特性，能够满足光纤通信系统中光纤阵列准直器小型化和集成化的需求。

为实现具有高频谱纯度、低相位噪声的宽带可调谐微波信号生成，提出并通过实验验证了一种次谐波信号调制下光注入半导体激光器结构的光电振荡器，其原理为通过利用光注入半导体激光器的单周期（P1）振荡工作状态和波长选择放大特性实现可调微波信号生成，并进一步通过在光电振荡环路中引入次谐波信号调制对系统生成微波信号的频率稳定性、边模抑制比与频谱纯度进行优化。实验结果表明，文中方案提出的光电振荡器可以生成输出功率大于5 dBm，频率调谐范围为12~18 GHz的微波信号。同时，系统生成的微波信号的3 dB带宽为100 kHz，边模抑制比可达 51 dB，且信号在频偏量为100 Hz和10 kHz处的相位噪声分别为−78 dBc/Hz和−109 dBc/Hz。此外，光电振荡器生成微波信号的频率调谐范围只受系统中使用的各类光电器件工作带宽的限制，通过采用具有更大带宽的光电器件可以实现更高频率的微波信号生成。

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.