Compact High-Extinction-Ratio Multimode Interference Electroabsorption Modulator

We proposed a compact electroabsorption modulator based on a multimode interference waveguide (MMI-EAM). Owing to both electroabsorption and electrorefractive effects in an InGaAlAs/InAlAs multiple quantum well core layer, an extinction ratio of as high as 39 dB can be obtained in the 1.55 µm wavelength region with wavelength independence.