高效异质结构四波长波分复用器的设计与优化

The design and optimization of high efficiency heterostructure four-wavelength wavelength division multiplexing

将两光子晶体单模波导平行、邻近放置构成一个光子晶体波导耦合结构.根据耦合和解耦合理论,设计了一种新型的高效异质结构四波长波分复用器.应用时域有限差分法模拟了该器件的效率,并通过改变一排介质柱的折射率,实现了较高的透射率.进一步发现在入射口处添加三对介质柱,可以有效地降低系统的反射,实现了四个波长的高效传输,四个波长的透射率均超过了90%.该器件不仅具有较高的透射率,而且其尺寸仅为36μm×17μm,在未来的光子集成回路中具有潜在的应用价值.

A photonic crystal waveguide coupled structure can be constructed by placing two photonic crystal waveguides dosely and parallel to each other. A new type of high efficiency heterostructure four-wavelength wavelength division multiplexing is designed according to the theory of coupling and decoupling. The finite-difference time-domain method is used to simulate the efficiency of the device,and the simulated results show that higher transmittance is achieved by adjusting the refractive index of a row of dielectric rods. We further found that adding three pairs of rods in the incident medium can effectively reduce the reflection of the system to realize the efficient transport for four-wavelength and the transmittance can exceed 90% . The present device not only has a high transmission rate,but also its size is only 36 μm × 17 μm and may have potential applications in future photonic integrated circuits.