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将五光子晶体单模波导平行、邻近放置构成定向耦合器,依据自映像原理,数值分析了输入光场对称入射时,该系统中光的传播行为。基于此结构,设计了1×3光分束器,其器件长度可短至14.26μm。仅仅通过对称地改变耦合区中两个介质柱的有效折射率,使光场在横向发生重新分布,便可实现输出能量的均分或自由分配。通过非对称地改变耦合区中的一个介质柱,可实现3个输出端的输出能量的自由分配。该光分束器具有微小尺寸和各输出端输出能量的比例可自由调制的特点,在未来集成光回路中具有广泛的应用价值。
The five-photonic crystal single-mode waveguides are arranged in parallel and adjacent to each other to form a directional coupler. According to the self-mapping principle, the light propagation behavior of the system is analyzed numerically when the input light field is symmetrically incident. Based on this structure, a 1 × 3 beam splitter was designed with a device length as short as 14.26 μm. Just by symmetrically changing the effective refractive index of the two dielectric columns in the coupling region, the redistribution of the light field in the horizontal direction can achieve the equalization or free distribution of the output energy. By asymmetrically changing one of the dielectric columns in the coupling region, the output energy of the three outputs can be freely distributed. The beam splitter with a small size and the output of the energy output of the ratio of the modulation can be freely, in the future integrated optical circuit has a wide range of applications.