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首先利用变分有效折射率法对聚合物脊形多模光波导基模和高阶模的色散特性与横向场分布进行分析,研究了波导结构参数对色散特性的影响,计算出TM基模和高阶模的光场分布,得出了聚合物脊形光波导的单模传输条件.然后利用广角有限差分束传播法和有效折射率法研究了S形脊波导圆弧曲率半径与弯曲损耗的关系,得出了如下结论:当圆弧曲率半径大于5000μm后,即使波导曲率半径增大,波导的弯曲辐射损耗已不会再明显减小,光已可以在S形脊波导中稳定地传播了.
Firstly, the dispersion and transverse field distributions of fundamental mode and high-order modes of polymeric ridge multimode waveguide are analyzed by variational effective refractive index method. The influence of structural parameters of waveguide on the dispersion characteristics is studied. The effects of TM fundamental mode and high-order mode And the single-mode propagation condition of the polymer ridge waveguide was obtained.Furthermore, the relationship between the radius of curvature and the bending loss of the S-shaped ridge waveguide was studied by means of the wide-angle finite-difference beam propagation method and the effective refractive index method The conclusion is as follows: When the radius of curvature of the circular arc is more than 5000μm, the bending radiation loss of the waveguide will no longer decrease obviously even if the radius of curvature of the waveguide increases, and the light can propagate stably in the S-shaped ridge waveguide.