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

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.