Strong dispersive features of dual Bragg cladding waveguides using higher-order mode-coupling mechanism

Abstract

The dispersion characteristics of a symmetric high index core dual cladding Bragg reflection waveguide consisting of a homogeneous core and two distinct and non-identical periodically stratified cladding sections is presented. It is shown that Bragg reflections from the inner and outer Bragg claddings lead to a substantial redistribution of modal power in different regions of the waveguide as the wavelength is varied. This leads to unique group velocity dispersion properties of the dual Bragg cladding waveguide modes as compared to single periodic cladding Bragg reflection waveguides exhibiting a maximum or minimum in the group velocity dispersion curve. Such a modified dispersion characteristic may find applications in devices based on Bragg reflection waveguides.