We report the first GaAs/AlxGa1-xAs superlattice waveguide absorption modulators operating at ~ 860 nm which utilize the Wannier-Stark effect. The n =-1 Stark ladder peak is used, which is the transition from the valence band well to the nearest neighbor conduction band well. This peak shifts rapidly with applied electric field, resulting in drive voltages lower than can be achieved using the quantum-confined Stark effect for quantum-well waveguides of similar structure. For a 1000 μm, long waveguide at 867 nm, we obtain an extinction ratio of ∼ 20 dB and a 4 dB attenuation with a drive voltage of 2 V.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering