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在考虑扩散沟道波导的二维折射率分布及导模场分布的基础上,对定向耦合器耦合长度作了理论推算;经与实验制作的一个四对电极结构的定向耦合器的实测结果作比较,相对误差为15.5％。在此基础上,分析讨论了器件的工作特性。
Based on the two-dimensional refractive index distribution and the guided mode field distribution of the diffusion channel waveguide, the theoretical coupling length of the directional coupler was theoretically calculated. The experimental results of a directional coupler with four pairs of electrode structures The relative error is 15.5%. On this basis, the working characteristics of the device are analyzed and discussed.