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设计了一种基于光子晶体多模波导的双波长光功分器,该器件能同时实现1.31μm和1.55μm两种通信波长的光信号功率的平均分配,整个器件长度仅为15μm,是已报道的常规结构的182分之一。根据导模传输法,讨论了对称入射时光子晶体多模波导中的自映像效应,采用时域有限差分法模拟了光场在波导中的分布,入射场的单重像和二重像交替在波导中周期性地出现。并讨论了功分器的输出效率,及输出效率随位于单模波导与多模波导联结处的介电柱位置变化而产生的变化。
A dual-wavelength optical power splitter based on a photonic crystal multimode waveguide is designed. The device can simultaneously distribute the optical signal power of the two communication wavelengths of 1.31μm and 1.55μm, and the whole device length is only 15μm. It has been reported The 182th of the conventional structure. According to the guided mode propagation method, the self-imaging effect in the photonic crystal multimode waveguide with symmetrical incidence is discussed. The distribution of the light field in the waveguide is simulated by the finite difference time domain method. The single image and the double image of the incident field alternate Waveguide appears periodically. The output efficiency of the splitter and the change of the output efficiency with the position of the dielectric column located at the junction of the single-mode waveguide and the multi-mode waveguide are discussed.