Analysis of Characteristic for Polymer Asymmetric Rib Waveguide

For organic polymer asymmetric rib waveguide, the fundamental mode cut-off conditions, the single-mode conditions and the polarization characteristics were studied systematically under different rib height, rib width, core height and the short side width of core slab by means of semi-vector finite-difference beam propagation method. The results showed that both fundamental mode cut-off area and the single-mode area increased with the reducing of rib height and rib width and the single-mode area decreased with the reducing of the short side width of core slab at a certain core height. The effect of core height was small on the fundamental mode cut-off and single-mode conditions at a certain rib height or rib width. In the asymmetric ridge waveguide the polarization characteristic had not been changed basically and the birefringence decreased with decreasing of the short side width of core slab. The results had great referential value for application of the organic polymer asymmetric rib waveguide.