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设计了基于SOI结构的超小微环陷波滤波器,该滤波器便于集成且可实现深度陷波。根据对全通结构微环谐振腔的传输特性分析得知,为得到好的陷波特性就必须增加波导间的耦合强度。在相同半径的全通微环谐振环结构中,耦合系数主要与3个参数(波导宽度、间距以及耦合区域的长度)有关。通过理论计算及仿真分析,对以上3个参数对陷波滤波器输出光谱响应的影响进行了讨论。实验结果表明,陷波滤波器越接近临界耦合条件(r=a)时,消光比越高。此时,消光比达36 dB以上,滤波器的FSR约为72 nm。
The design of SOI-based ultrasmall micro-ring notch filter, the filter is easy to integrate and can achieve deep notch. According to the analysis of the transmission characteristics of the all-pass micro-ring resonator, it is necessary to increase the coupling strength between the waveguides in order to obtain good notch characteristics. In the all-pass micro-loop resonant ring structure of the same radius, the coupling coefficient is mainly related to three parameters (waveguide width, pitch and the length of the coupling region). The influence of the above three parameters on the output spectral response of notch filter is discussed by theoretical calculation and simulation analysis. Experimental results show that the closer the notch filter is to the critical coupling condition (r = a), the higher the extinction ratio. At this point, the extinction ratio of 36 dB or more, the filter FSR is about 72 nm.