论文部分内容阅读
采用精确、严格的全矢量模式匹配法,计算了三维脊型弯曲波导和条形弯曲波导的本征模式,分析了模式折射率和辐射损耗随弯曲半径的变化关系.计算结果与已报道的有限差分法的结果符合很好.对文献中已报道但没有深入分析的现象给出了合理的解释.半径为50和12μm的条形波导的计算结果表明:当波导的弯曲半径减小时,发生在分界面处的TE-TM模耦合会显著增强,这将导致弯曲波导中的模式不再是传统意义上的准TE模和准TM模,而是混合模.随着半径的减小,混合模的横向分量之间的差异会减小,当两个横向分量达到近似相等的强度时,波导的偏振相关性将会大大减小.
The eigen modes of the three-dimensional ridged flexural waveguide and the strip-shaped flexural waveguide were calculated by the exact and exact full-vector mode matching method, and the relationship between the modal refractive index and the radiation loss with the bending radius was analyzed. The calculated results were in agreement with the reported finite The results of the difference method are in good agreement with the phenomena reported in the literature but not thoroughly analyzed.The calculation results for the strip waveguide with radii of 50 and 12 μm indicate that when the bending radius of the waveguide decreases, The TE-TM mode coupling at the interface will be significantly enhanced, which will result in the modes in the flexural waveguide being no longer quasi-TE and quasi-TM in the traditional sense, but mixed modes. As the radius decreases, the mixing modes The difference between the horizontal components of the waveguides decreases, and when the two horizontal components reach an approximately equal intensity, the polarization dependence of the waveguides will be greatly reduced.