Zhan Xiang, Xu Chuanpei, Hu Cong, Song Yuxin
Appl Opt. 2023 Jun 1;62(16):4171-4179. doi: 10.1364/AO.488649.
In order to solve the defects of the high driving voltage and a large volume of the existing electro-optical modulators, a double-waveguide stacked graphene optical modulator based on a Mach-Zehnder Interferometer structure is designed in this paper. First, the modulator size of traditional planar structure is effectively reduced by stacking two modulators vertically. Secondly, by changing the relative position of the electrode and the waveguide, the coupling effect of the electrode and the waveguide is enhanced, and the driving voltage is reduced. Finally, the performance of the designed electro-optic modulator is verified by the finite element method. The half-wave voltage of 0.55 V · cm and the modulation bandwidth of 58.8 GHz are realized on the basis of the length of 1.14 mm. The insertion loss is 1.15 dB, and the return loss is -44.8 .
为了解决现有电光调制器驱动电压高、体积大的缺陷，本文设计了一种基于马赫曾德尔干涉仪结构的双波导堆叠石墨烯光调制器。首先，通过将两个调制器垂直堆叠，有效减小了传统平面结构的调制器尺寸。其次，通过改变电极与波导的相对位置，增强了电极与波导的耦合效果，降低了驱动电压。最后，采用有限元方法对所设计的电光调制器性能进行了验证。在1.14 mm的长度基础上实现了0.55 V·cm的半波电压和58.8 GHz的调制带宽。插入损耗为1.15 dB，回波损耗为-44.8。
