为了适应滤波、延时、波分复用等不同的应用场景, 集成硅基光子滤波器需要具备高速的可调谐和可重构特性。本文提出了一种基于自耦合微环集成光子滤波器, 将3个MZI型光开关连接, 构成可调谐的自耦合微环谐振腔。通过控制器件上的电极, 可以将该器件重构成光开关、非平衡MZI滤波器、双微环辅助的MZI滤波器、双注入型微环谐振腔滤波器以及自耦合微环辅助的MZI滤波器等五种不同结构。通过传输矩阵法对该器件进行建模仿真。仿真结果表明, 基于该器件的双微环辅助的MZI滤波器可实现在带阻滤波器与带通滤波器之间的切换, 消光比大于35 dB。双注入型微环谐振腔滤波器可实现在两种不同自由光谱范围之间切换, 且滤波频率可调谐范围可达18 GHz。相比于许多现有的功能单一的滤波器, 该结构具有极佳的可重构特性, 在集成光子信号处理和微波光子学等领域具有良好的应用价值。

The fast tunability and reconfigurability are essential for a silicon photonic filter for various application scenarios, such as an optical filter, time delay, and wavelength division multiplexing.In this work, we propose a reconfigurable filter based on a self-coupled micro-ring resonator combined with three optical switches. By controlling the electrodes, the proposed component can be reconfigured into five different structures, including the optical switch, non-balanced Mach-Zehnder Interferometer(MZI) filter, dual-ring-coupled MZI filter, micro-ring resonator filter with a double injection, and a self-coupled micro-ring resonator assisted MZI filter.Simulations have been performed based on the transmission matrix of the proposed filter. Based on the simulation results, the reconfigured dual-ring-coupled MZI filter has the capability of switching from a notch filter to a bandpass filter with an extinction ratio larger than 35 dB. The micro-ring resonator filter with double injection can be switched between two different FSRs, and the frequency tuning range is approximately 18 GHz. Compared tonumerous integrated single-function optical filters, the proposed structure has much higher flexibility and reconfigurability, and has the potential to be applied in integrated optical signal processing and microwave photonic systems.