Reducing Insertion Loss of Photonic Crystal Couplers by Suppressing the Remained Power  

作　　者：毛晓宇 王建锋 黄翊东 张巍 彭江得 

机构地区：[1]Department of Electronics Engineering, Tsinghua University, Beijing 100084

出　　处：《Chinese Physics Letters》2007年第2期454-457,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No 60537010.

摘　　要：We find that the increasing coupling strength can lead to a decreasing density of power inside the waveguide of a photonic crystal waveguide （PC-WG） directional coupler, which is called the mode power remaining phenomenon. This phenomenon is detrimental to achieving low insertion loss of the coupler. An improved structure of the PC- WG directional coupler is proposed by simply increasing the radii of air holes in the post coupling region. The simulation results demonstrate that the insertion loss can be reduced dramatically by suppressing the remained power, and therefore both the short coupling length （8μm） and low insertion loss （lower than 0.5dB） can be obtained.We find that the increasing coupling strength can lead to a decreasing density of power inside the waveguide of a photonic crystal waveguide （PC-WG） directional coupler, which is called the mode power remaining phenomenon. This phenomenon is detrimental to achieving low insertion loss of the coupler. An improved structure of the PC- WG directional coupler is proposed by simply increasing the radii of air holes in the post coupling region. The simulation results demonstrate that the insertion loss can be reduced dramatically by suppressing the remained power, and therefore both the short coupling length （8μm） and low insertion loss （lower than 0.5dB） can be obtained.

关 键 词：WAVE-GUIDES 

分 类 号：O7[理学—晶体学]