By using poled-polymer/silicon slot waveguides in the active region and the Pockels effect of the poled-polymer, we propose a kind of Mach-Zehnder interferometer (MZI) electro-optic (EO) switch operated at 1 550 nm. Structural parameters are optimized for realizing normal switching function. Dependencies of switching characteristics on the slot waveguide parameters are investigated. For the silicon strip with dimension of 170 nm×300 nm, as the slot width varies from 50 nm to 100 nm, the switching voltage can be as low as 1.0 V with active region length of only 0.17–0.35 mm, and the length of the whole device is only about 770–950 μm. The voltage-length product of this switching structure is only 0.17–0.35 V·mm, and it is at least 19–40 times smaller than that of the traditional polymer MZI EO switch, which is 6.69 V·mm. Compared with our previously reported MZI EO switches, this switch exhibits some superior characteristics, including low switching voltage, compact device size and small wavelength dependency.

结合有机聚合物材料和无机SiO2材料, 设计一种1×2多模干涉—马赫曾德尔干涉仪热光开关, 优化器件参数, 并对其性能进行模拟.利用化学气相沉积、光刻等工艺制备热光开关, 并对其波导形貌进行表征.为了测试器件性能, 采用ARM7处理器和InGaAs光电探测器, 设计并研制了一种光开关性能测试系统.该系统主要由低纹波线性供电电源、光电探测器、前置放大器、主放大器、信号调理器、模数转换器、主控制器、显示器等构成.采用商用光功率计对该测试系统进行标定, 其零点漂移小于0.5 dBm.在光开关电极上施加不同的直流驱动电压, 作为对比, 利用自主研制的光功率计和商用光功率计分别测试光开关某端口的输出光功率.实验结果表明, 两种情况下测得曲线的变化趋势一致, 均在驱动电压为10 V时, 输出光功率达到最小值.该测试系统具有良好的性能, 可满足实际测试需要.

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.

Optimization and simulation are performed for a polymer four-port microring optical router with three channel wavelengths, which contains four-group basic routing elements with two different ring radii. In terms of microring resonance theory, coupled mode theory and transfer matrix method, expressions of output power of basic routing element and optical router are derived. In order to realize single-mode propagation, low optical transmission loss and phase match between microring waveguide and channel waveguide, the device parameters are optimized. With the selected three channel wavelengths of 1550 nm, 1552 nm and 1554 nm, characteristics are calculated and analyzed, including output spectrum, insertion loss and crosstalk. Simulation results indicate that the device has 12 possible I/O routing paths, the insertion losses of three channel wavelengths along their routing paths are within the range of 0.02-0.61 dB, the maximum crosstalk between the on-port along each routing path and other off-ports is less than -39 dB, and the device footprint size is ~0.13 mm₂. Based on the proposed structure, through proper selection on ring radius, the routing structure can also be used for other channel wavelengths. Therefore, the designed structure shows wide applications in integrated optical networks-on-chip (NoC).

基于表面等离子体共振理论, 将SU-8作为波导芯层材料, 以聚甲基丙烯酸甲酯(PMMA)为下包层材料, 设计了一款聚合物波导型SPR传感器。理论计算了波导芯层折射率、被测物折射率、不同金属薄膜及其厚度等因素对表面等离子体共振曲线的影响。分析结果表明, 在可测试范围内, 被测物折射率越大, 灵敏度越高; 波导芯层折射率减小, 共振峰向长波方向移动, 被测物检测范围整体向折射率小的方向偏移, 波导芯层折射率增大则相反。