Theoretical studies of AlGaAs-GaAs multiple-quantum-well optical couplers defined by ion-implantation-induced intermixing

A simple and accurate model is presented for the analysis of ion-implanted AlGaAs-GaAs multiple-quantum-well (MQW) symmetric and asymmetric optical couplers. The modal propagation constants and field profiles of the guided modes of the couplers are solved numerically using a quasi-vector method based on the Galerkin's method. MQW optical couplers defined by ion-implantation-induced intermixing are shown to have similar optical properties as conventional dielectric rib optical couplers. They also provide a more flexible control over the waveguiding and coupling characteristics by changing parameters such as waveguide separation, mask width, ion implant energy, and diffusion time.