摘要
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。
Based on the resonant coupling principle between the defect mode of micro-cavity and the waveguide mode, a new multi-channel drop filter is designed using the two-dimensional square lattice photonic crystal. The filter is composed of the bus waveguide, the 90° bend waveguide and the resonant micro-cavitiy. Every channel drop efficiency of the filter is enhanced greatly due to the perfect combination. The transmission characteristic of the filter is simulated with two-dimensional finite difference time domain method and theoretical analysis is performed in order to understand the important factors affecting the drop efficiency. The optimized device enhances the drop efficiency of every channel drop waveguide to over 91%. The simulation results show that the filter has the ability to download the light wave efficiently. The device has a good wavelength selection performance with the channel spacing of 20 mm, the center accordance less than ±2 nm and the maximal spectral half-width of 3.2 nm. It is demonstrated that the drop efficiency of the filter is improved greatly by increasing the coupling region between the download waveguide and the resonant micro-cavity.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2012年第11期60-65,共6页
Acta Optica Sinica
基金
国家自然科学基金(61167002)
安徽省高校科学研究项目(KJ2012B115)
安徽巢湖学院博士科研启动基金资助课题
关键词
光子晶体
多信道下载滤波器
时域有限差分法
微腔
photonic crystal
multi-channel drop filter~ finite difference time domain method
micro-cavity
