Taper couplers for GaAs−AlxGa1−xAs waveguide layers produced by liquid phase and molecular beam epitaxy

Abstract
Growth techniques and passive evaluation of tapered waveguide light couplers produced by LPE and MBE are reported. Coupling efficiencies approaching 100% for the transfer of light from a GaAs layer to a layer of Al0.1Ga0.9As are observed for MBE tapers, and tapers fabricated by LPE allow ∼50% coupling, suitable for use with LPE active devices.