为了实现集成光电子器件的一器多用,利用石墨烯波导的调制作用设计 了一种分光比可控的分束器。在马赫-曾德尔结构的一个干涉臂波导中嵌入石墨烯层,并通过施加偏置电压引入 额外的相位差从而实现输出强度的调制。利用有限差分时域(FDTD)方法计算了石墨烯波导的特性,并仿真了分 束器的传输特性。理论和仿真结果表明所设计的分束器具有良好的光学性能,并且其分光比可由调制电压在一定范围内调控。

In order to realize a multipurpose integrated optical device, a power splitter with tunable splitting ratio is designed based on the modulation function of graphene-silicon waveguide. In the splitter, graphene layers are embedded in the waveguide of one arm of the Mach-Zehnder(MZ) structure, and an extra phase difference is introduced by applying bias voltage to obtain output power modulation. The finite-difference time-domain (FDTD) method is used to calculate the properties of the graphene-silicon waveguide, and then the transmission performance of the splitter is simulated. Both theoretical and simulation results show that the designed splitter has good optical performance, and its splitting ratio can be tuned by bias voltage.