光学精密工程2025，Vol.33Issue(8)：1190-1201,12.DOI:10.37188/OPE.20253308.1190
二信道光子晶体滤波系统
Two-channel photonic crystal filter system
摘要
Abstract
Based on the temporal coupled-mode theory and the light-controlling characteristics of line-de-fect waveguides and point-defect resonant cavities,a two-channel filtering system composed of a main waveguide,two drop waveguides,two resonant cavities,and two reflecting cavities was designed using the two-dimensional square lattice photonic crystal.The band structures of the complete photonic crystal and the line-defect waveguide were calculated by the plane-wave expansion(PWE)method,and the mod-al distribution of the point-defect resonant cavity was analyzed.Using the Finite-Difference Time-Domain(FDTD)method,the transmission characteristics of the filtering system were investigated.The effects of linear variations in the distances from the reflector and reflection cavity to the reference plane of the reso-nant cavity on the system's download efficiency were analyzed.Additionally,the variation patterns of transmittance peaks with these distance parameters were elucidated.Guided by the calculation results,the simulation design of the filtering system was implemented.The simulation results demonstrate that the fil-tering system can couple the optical signals with wavelengths of 1 561.2 nm and 1 570.5 nm into their re-spective drop waveguides with relatively high precision.The transmission efficiencies of them are 98.9%and 97.2%.The full width at half maximum(FWHM)values are 3.3 nm and 3.5 nm.The quality fac-tors are 473 and 449,and the wavelength interval is Δλ=9.3 nm.The proposed filtering system exhibits a compact footprint of merely 20.88 μm×22.04 μm with a structurally simple configuration.Featuring a tunable operating wavelength and high compatibility with large-scale integration,this study can provide certain theoretical foundations and conceptual insights for the design of integrated optical circuits in optical communications.关键词
耦合模理论/波导/点缺陷谐振腔/平面波展开法/时域有限差分法/滤波器Key words
coupled mode theory/waveguide/point defect resonator/plane wave expansion method/Fi-nite-Difference Time-Domain(FDTD)/filter分类
物理学引用本文复制引用
刘杰,卢辉东,赵俊,董杰,胡延梅,温建蓉,邢琪,李鹏辉..二信道光子晶体滤波系统[J].光学精密工程,2025,33(8):1190-1201,12.基金项目
山西省高等学校科技创新项目(No.2022JX04) （No.2022JX04）
山西省高等学校科技创新项目(No.2024L461) （No.2024L461）
山西省高等学校科技创新项目(No.2022L639) （No.2022L639）
