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.
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