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本文设计了一个基于圆柱型硅光子晶体自准直环形腔的1×2光下路分束器.该光下路分束器由三个分光镜和一个反射镜构成,其中窄光束依赖自准直效应进行传输.利用多光束干涉理论分析了光下路分束器中不同出口的理论透射谱,并且利用时域有限差分法对光下路分束器透射谱进行数值模拟计算,其结果与理论预测基本一致.当下路波长为1 550nm时,光下路分束器的自由光谱范围约为30nm,几乎涵盖了整个光通信C波段.由于其小尺寸和全硅材料,本文设计的1×2光下路分束器有望应用于未来的集成光路中.
In this paper, a 1 × 2 optical sub-beam splitter based on a cylindrical self-collimating annular cavity of silicon photonic crystal is designed, which consists of three beam splitters and one reflector. The direct transmission effect is analyzed.The theoretical transmission spectra of different outlets in the optical sub-beam splitter are analyzed by the multi-beam interference theory.The numerical simulation of the transmission spectra of the optical sub-beam splitter is carried out by using the finite-difference time-domain method The theoretical prediction is basically the same.When the wavelength of 1 550nm, the optical spectrum of the beam splitter free spectral range of about 30nm, covering almost the entire optical communications C-band.Because of its small size and all-silicon materials, this design 1 × 2 light beam splitter is expected to be used in the future integrated optical path.