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采用二维正方排列的光子晶体,根据微腔缺陷模和波导模共振耦合原理,设计了一种新型的多信道下载滤波器,该滤波器通过主波导、90°弯波导和共振微腔的组合,提高了各个信道下载波导的下载效率。利用二维时域有限差分法模拟了滤波器的传输特性,并理论分析了影响下载效率的因素,进一步对滤波器进行了优化,使得各信道下载波导的下载效率均在91%以上。模拟结果表明该滤波器能有效地实现光波的分波下载,传输谱信道波长间隔约为20nm,中心波长误差为±2nm,传输谱的最大半宽度为3.2nm,有良好的波长选择性,证实了增大下载波导和共振微腔的耦合区域可以有效地提高滤波器的下载效率。
According to the principle of microcavity defect mode and waveguide mode resonance coupling, a new type of multi-channel download filter is designed by using a two-dimensional square-arranged photonic crystal. The filter passes through a combination of a main waveguide, a 90 ° bent waveguide and a resonant microcavity , To improve the download channel of each channel download efficiency. The two-dimensional finite-difference time-domain method was used to simulate the transmission characteristics of the filter, and the factors affecting the download efficiency were analyzed theoretically. The filter was further optimized so that the download efficiency of each channel was above 91%. The simulation results show that this filter can effectively demultiplex the light wave. The wavelength of the transmission spectrum is about 20 nm, the center wavelength is ± 2 nm, the maximum half-width of the transmission spectrum is 3.2 nm, and the wavelength selectivity is good Increasing the coupling region between the download waveguide and the resonant microcavity can effectively improve the efficiency of the filter.