Rib waveguide switches with MOS electrooptic control for monolithic integrated optics in GaAs-Al_xGa_1−xAs

Abstract

Low-loss (1.4-cm⁻¹) single-mode rib waveguides in Al_xGa_1−xAs heterostructures are fabricated by liquid phase epitaxy, double anodization, and photolithographic techniques. Switching of optical channels between adjacent waveguides is accomplished with directional coupler switches controlled with electrodes laid over an isolating dielectric, making a metal-oxide-semiconductor (MOS) configuration. Complete switching is achieved with β reversal electrode configuration. A 2 × 4 switching matrix with low-loss lateral offsets of the waveguides is demonstrated. By laying out several optical switching and guiding experiments within a 128-μm stripe, we show that independent optical circuits can be packed with adequate optical isolation using centerline separations ≈10 μm.