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以热光型器件的热学模型和温度场解析表达式为基础,运用射线法,通过计算位于芯区不同子午面内的光线反射轨迹,对热光效应下光束经全内反射后展宽的原因和规律进行了分析,并且给出了具体光束展宽值的理论计算方法;设计了高反射率的全内反射型有机聚合物热光开关。在设计中应用所提出的规律,理论上计算出了具体的展宽波导宽度、芯区的掩埋深度、扩大的反射区宽度等结构参量。软件的模拟结果表明,该结构在反射态和直通态时的效率分别为82.6%和84.4%,串扰均大于30dB,并且对这些结构参量的模拟优化结果与理论计算结果基本一致。
Based on the thermal model and the analytical expression of the temperature field of the thermo-optic device, by using the ray method, the light reflection trajectory in different meridian planes of the core region is calculated to broaden the light beam after total internal reflection in the thermo-optic effect and The regularity is analyzed, and the theoretical calculation method of the beam broadening value is given. A total internal reflection type organic polymer thermo-optic switch with high reflectivity is designed. In the design, the proposed law is used to theoretically calculate the structural parameters such as broadening waveguide width, buried depth of core region, and widened reflective region width. The simulation results show that the efficiency of the structure is 82.6% and 84.4% respectively in the reflected state and the straight-through state, and the crosstalk is greater than 30dB. The simulation and optimization results of the structure parameters are in good agreement with the theoretical results.