行波电吸收调制器中脊宽对频带宽度的影响  

Influence of Ridge Width on Its Frequency Bandwidth of Traveling-wave Electroabsorption Modulators

作　　者：邢晓波[1] 刘叶新[1] 陈晓文[1] 傅思镜[1] 林位株[1] 

机构地区：[1]中山大学光电材料与技术国家重点实验室,广州510275

出　　处：《光子学报》2005年第12期1795-1798,共4页Acta Photonica Sinica

基　　金：国家和广东省自然科学基金项目资助(批准号:60178020;10274107;011204;2002B11601)

摘　　要：根据行波电吸收调制器(TWEAM)的微波传输特性,提出了等效电路模型.制作了工作波长为850nm的GaAs/GaAlAs材料的TWEAM,并通过等效电路模型分析了特性阻抗Z0、微波传输常数γ和S21,得出脊宽对器件微波特性的影响.从理论上验证了较小脊宽可以降低微波和光波之间的速度失配、波导的传输损耗及传输线和终端及源端之间的阻抗失配.理论模拟得出:脊宽为2μm时,器件提供的带宽为23.9GHz.According to the microwave properties of the traveling-wave electroabsorption modulator （TW- EAM） transmission line, an equivalent circuit model was presented and a GaAs/GaAlAs TW-EAM for 850 nm has been fabricated. The influence of the ridge width on the frequency bandwidth was driven by analyzing the characteristic impedance Z0, microwave transmission constant γ and S21. A reduced velocity mismatch between optical wave and microwave and an impedance mismatch were demonstrated for the narrower ridge width. Potential frequency bandwidth of 23. 9 GHz of a TW-EAM was predicted by theoretical simulation when the ridge width was 2 μm.

关 键 词：行波电吸收调制器(TW—EAM) 特性阻抗 传输常数 调制带宽 

分 类 号：TN76[电子电信—电路与系统] TN711