基于多模干涉的二维光子晶体解复用器

1-to-2 Photonic Crystal Wavelength De-multiplexer Based on Multimode Interference Effect

通过平面波展开法计算了单模和多模光子晶体线缺陷波导的色散曲线,基于多模干涉效应和自成像原理,设计了1×2二维硅光子晶体解复用器。时域有限差分法(FDTD法)模拟光场分布,结果表明该结构可实现对1.31μm和1.55μm两个主要通讯波长解复用。这一方法可进一步用于其它新型光子晶体器件的设计。

We design a 1-to-2 photonic crystal wavelength de-multiplexer based on multi-mode interference in the paper.The de-multiplexer can work at the two communication wavelength 1.31 μm and 1.55 μm.The plane-wave expansion method is used to calculate the band-structure of photonic crystals.The dispersion relations of the multi-modes propagating in multimode photonic crystal waveguide are analyzed,and thus the reproduction of input field profile is explained.The finite-difference time-domain(FDTD)method is adopted for the numerical simulation of related structure.There is a good agreement between the computational simulation and theoretical description.This approach can be extended to the novel design of photonic crystal devices.