Using quasi-guided modes for modeling the transfer behavior of bent dielectric slab waveguides

[摘要] The connection of two straight dielectric multimode slab waveguides by acircular bent waveguide is analyzed by means of quasi-guidedmodes. These modes correspond to the well known leaky modes, but own realeigenvalues, thus the mathematical description is simpler. Furthermore theyare derived as approximate solutions of the exact theory. This work willfirst give a brief introduction to the basic theory, followed by adiscussion of the properties of quasi-guided modes. After a validation bycomparison with a numerical simulation using the Finite IntegrationTechnique, results for the bending loss of multimode waveguides arepresented.

[学科分类] 电子、光学、磁材料