With the organic polymer ridge waveguide as the research object, the polarization characteristic of symmetric ridge waveguides with different ridge heights, ridge widths and core thicknesses were systematically analyzed by a semi-vector finite-difference beam propagation method (FD-BPM). Furthermore, the polarization characteristics of asymmetric ridge waveguides were analyzed, and the influence of the shorter side width of the core to the polarization characteristic is studied. The result shows that the introduction of asymmetric ridge structure has a minor effect to the polarization characteristic, and the birefringence decreases along with the reduction of the shorter side width of the core. The birefringence of the asymmetric ridge waveguide can be controlled in an acceptable range when the ridge height is 1. 3 μm and the shorter side width of the core is 2.0μm.%以有机聚合物脊波导为研究对象,采用半矢量有限差分光束传输法,系统地分析了不同脊高、脊宽和芯层厚度条件下对称脊波导的偏振特性,并在此基础上分析了非对称脊波导的偏振特性,研究了平板芯层短边宽度对偏振特性的影响.结果表明:非对称脊波导结构的引入对偏振特性影响较小,其双折射随平板芯层短边宽度的减小而减小.当脊高为1.3 μm、平板芯层短边宽度为2.0μm时,非对称脊波导双折射能控制在可接受范围.
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