反相电极聚合物定向耦合电光开关的优化设计

Optimal Design of a Polymer Directional Coupler Electro-optic Switch Using Reversed Electrodes

为了消除单节电极定向耦合电光开关的工艺误差对器件性能的不良影响,应用耦合模理论、电光调制理论、保角变换及镜像法,优化设计了一种两节交替反相电极聚合物定向耦合电光开关.模拟结果表明,该器件具有良好的开关性能:在1550nm的工作波长下,器件耦合区的长度为4753.5μm,交叉态电压为1.22V,直通态电压为2.65V,插入损耗小于2.21dB,串扰小于-30dB.通过微调状态电压,可以很容易地消除工艺误差对器件性能产生的不良影响.本文方法的设计结果与光束传播法的仿真结果符合得很好.

To eliminate the negative effect of the fabrication error on the performance for the directional coupler electro-optic switch with single-section electrode, the structure is designed, the parameters are optimized, and the characteristics are analyzed for a polymer directional coupler electro-optic switch with two-section reversed electrodes by using the coupled mode theory, electro-optic modulation theory, conformal transforming method and image method. Simulation shows that the designed device exhibits excellent switching functions. Under the operation wavelength of 1550 nm, the coupling region length is 4753.5μm, the cross-state and bar-state voltages are about 1.22 V and 2.65 V, and the insertion loss and crosstalk are less than 2.21 dB and –30 dB, respectively. By slightly adjusting the state voltages, the blight of the fabrication errors on the switching characteristics can be easily eliminated. The calculation results of the presented technique are in good agreement with those of the beam propagation method （BPM）.