两节推挽极化波导Y型耦合器电光开关特性分析

针对两节独立反相集总电极聚合物Y型耦合器电光开关响应速度慢的问题, 通过对该器件两节电光区的波导进行推挽极化, 设计了一种无偏置行波电极高速电光开关.为了获得低的驱动电压、良好的阻抗匹配和光波与微波间较小的折射率失配, 对电极参数做了设计和优化.通过对施加的方波开关信号做傅里叶变换并结合行波传输线理论, 给出了一种用于建模和表征器件高频响应的解析分析法.对该器件的数值计算结果表明, 在1 550 nm中心工作波长下, 其3 dB状态电压为0 V, 开关电压为2.68 V, 上分支状态电压和下分支状态电压分别为-1.34 V 和 +1.34 V,器件的插入损耗和串扰分别小于3.55和 -30 dB, 10%-90%上升时间和下降时间均为3.90 ps, 截止开关频率可达128.2 GHz.

Abstract

Considering that the switching speed of the Y-fed coupler Electro-Optic (EO) switch with two-section seperated reversed lumped electrodes is slow,through push-pull poling on the wavegides in the two EO regions,a bias-free high-speed travelling-wave line EO switch was designed.Design and optimization were performed on electrode parameters for obtaining low driving voltage,good impedance match and less-mismatch between optical index and microwave index.Besides,by using Fourier transformation on the applied square-wave switching signal,a novel analytical technique was presented to model and characterize the switching response.Numerical calculation results of the optimized device indicate that,under 1 550 nm central operation wavelength,the 3 dB state voltage is 0 V,and the upper-and lower-branch state voltages are -1.34 V and +1.34 V,respectively,indicating a switching voltage of 2.68 V.The insertion loss and crosstalk are less than 3.55 and -30 dB,respectively,and the 10%-90% rise time and fall time are both about 3.90 ps,indicating a cutoff switching frequency up to 128.2 GHz.The proposed high-speed device structre and numerical technique are of well meaning for the design and performance evaluation of a similar device based on Y-fed coupler structure.

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李祝博, 黄小亮, 李翠婷, 郑传涛. 两节推挽极化波导Y型耦合器电光开关特性分析[J]. 光子学报, 2015, 44(1): 0113001. LI Zhu-bo, HUANG Xiao-liang, LI Cui-ting, ZHENG Chuan-tao. Characteristics of a Y-fed Coupler Electro-optic Switch Using Two-section Push-pull Poled Waveguides[J]. ACTA PHOTONICA SINICA, 2015, 44(1): 0113001.

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