提出了一种SOI新型MOS电容型电光调制器.与普通单一电容型MOS调制器相比,由三层栅氧化层形成的新型MOS电容型调制器提高了调制效率.模拟显示,调制电压和调制长度乘积为VπLπ=2.4V·cm,上升和下降时间分别为80和40ps,带宽达到了8GHz.通过减小器件尺寸能进一步提高调制效率和调制速度.
We propose and analyze a novel Si-based electro-optic modulator with an improved metal-oxide-semiconductor (MOS) capacitor configuration integrated into silicon-on-insulator (SOl). Three gate-oxide layers embedded in the silicon waveguide constitute a triple MOS capacitor structure, which boosts the modulation efficiency compared with a single MOS capacitor. The simulation results demonstrate that the Vπ Lπ product is 2. 4V · cm. The rise time and fall time of the proposed device are calculated to be 80 and 40ps from the transient response curve, respectively,indicating a bandwidth of 8GHz. The phase shift efficiency and bandwidth can be enhanced by rib width scaling.