【摘要】 有机聚合物脊形光波导的色散特性对聚合物光子学器件性能具有重要影响。本文利用标量变分理论计算脊形光波导的有效折射率,其用到的近似光场分布运用变分有效折射率法获得。考虑折射率分布的横向变化,基于导模满足的矢量波动方程,利用微扰法对标量变分理论所得有效折射率进行偏振修正,求得精度更高的色散特性。对聚合物多模脊形光波导基模和高阶模的色散特性进行分析,研究了波导结构参数对色散特性的影响,分析了单模波导TM、TE基模的偏振色散特性。研究结果表明,运用本征方程分析TM模的色散特性误差大,必须加以修正;而对于TE模,其误差相对较小。更多还原

【Abstract】 The dispersion characteristics of organic / polymer optical rib waveguide affect the performances of polymer photonic devices greatly. In this paper,the effective refractive index of optical rib waveguide was calculated by scalar variational formula,and the distribution of optical field used was obtained by using effective index method( EI) approximately. Considering the transverse variations of refractive index distribution and based on the vector wave equation governing the guided modes,the effective index obtained by scalar variational formula( VEI) was modified by perturbation method( PM) for precise dispersion characteristics. The dispersion characteristics of the fundamental and higher order modes were analyzed for polymer multimode rib waveguides. An approach was provided to investigate the effect of the structure parameters and dimensions on the polarized dispersion characteristics of the fundamental and higher order modes for TM,TE modes. The polarized dispersion characteristics of single mode waveguide were analyzed for TM,TE fundamental modes. It is demonstrated that the dispersion characteristics of TM mode obtained by eigenvalue equation must be modified duo to the large error,and the error for TE mode is small relatively.更多还原