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给出了一种新型聚合物脊形波导定向耦合电光开关的结构模型和设计方法。应用保角变换法和镜像法分析了对称共面双电极的电场分布。为了获得最小的模式损耗和开关电压,优化了电极厚度、电极宽度和电极间距。为了使器件实现正常的开关功能,讨论了所能允许的开关电压的波动范围。模拟计算结果如下:脊形波导的芯宽度4.0μm,芯厚度1.5μm,脊高0.5μm,耦合间距3.0μm,优化后的电极厚度0.15μm,电极宽度3.0μm,电极间距3.5μm,耦合长度3082μm,开关电压5.43 V;当开关电压在5.28到5.59 V范围内波动时,器件的插入损耗小于0.60 dB,串扰小于-30 dB。与BPM仿真结果的对比表明,该优化方法具有较高的精度。
A new type of polymer ridge waveguide directional coupling electro-optic switch structure model and design method are presented. The electric field distribution of symmetric coplanar bipolar electrodes was analyzed by conformal mapping and image analysis. In order to obtain the minimum mode loss and switching voltage, the electrode thickness, electrode width and electrode spacing are optimized. In order to achieve the normal switching function of the device, the range of fluctuation of the switching voltage allowed is discussed. The simulation results are as follows: The ridge waveguide has a core width of 4.0μm, a core thickness of 1.5μm, a ridge height of 0.5μm, a coupling pitch of 3.0μm, an optimized electrode thickness of 0.15μm, an electrode width of 3.0μm, an electrode spacing of 3.5μm and a coupling length of 3082μm , Switching voltage 5.43 V; when the switching voltage fluctuates in the range of 5.28 to 5.59 V, the device insertion loss is less than 0.60 dB, crosstalk is less than -30 dB. The comparison with the BPM simulation results shows that the optimization method has higher accuracy.