Design of novel power splitters by directional coupling between photonic crystal waveguides  

作　　者：高永锋 周骏 周明 陈明阳 张伟 

机构地区：[1]School of Mechanical Engineering,Jiangsu University [2]Department of Physics,Faculty of Science,Ningbo University [3]Center for Photon Fabrication Science and Technology,Jiangsu University

出　　处：《Optoelectronics Letters》2010年第6期417-420,共4页光电子快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos.60977048 and 50975129);Qianjiang Talent Project of Zhejiang Province (No.2007R10015);the Senior Talent Foundation of Jiangsu University (No.07JDG074)

摘　　要：The design of a novel photonic crystal waveguide power splitter is presented.The proposed power splitter has three output ports,the coupling among three parallel photonic crystal waveguides can be considered as a multimode interference(MMI),and the positions of output waveguides are determined by those of twofold images which are formed by the self-imaging effect of multimode interference.The transmission characteristics of the splitter are investigated by using the finite-difference time domain(FDTD) and the plane wave expansion method.The output optical power in each port can be controlled by adjusting the radius of the dielectric rods in the coupling region,and the coupling effect among output ports is decreased by using the T-shaped output port.The results indicate that 1 × 1,1 × 2 and 1 × 3 type power splitters can be realized when the normalized radius of dielectric rods in the coupling region is 0.130,0.180,0.152 or 0.221,respectively.The design of a novel photonic crystal waveguide power splitter is presented.The proposed power splitter has three output ports,the coupling among three parallel photonic crystal waveguides can be considered as a multimode interference（MMI）,and the positions of output waveguides are determined by those of twofold images which are formed by the self-imaging effect of multimode interference.The transmission characteristics of the splitter are investigated by using the finite-difference time domain（FDTD） and the plane wave expansion method.The output optical power in each port can be controlled by adjusting the radius of the dielectric rods in the coupling region,and the coupling effect among output ports is decreased by using the T-shaped output port.The results indicate that 1 × 1,1 × 2 and 1 × 3 type power splitters can be realized when the normalized radius of dielectric rods in the coupling region is 0.130,0.180,0.152 or 0.221,respectively.

关 键 词：光子晶体波导 定向耦合 功率分配器 设计 平面波展开方法 输出端口 有限差分时域 多模干涉 

分 类 号：TN626[电子电信—电路与系统]