High-Extinction-Ratio Multiple Quantum Well Modulator Based on Multimode Interference Waveguide

We proposed an optical modulator based on a multiple quantum well (MQW) multimode interference (MMI) waveguide. A partial electrode region is asymmetrically placed in an MMI waveguide. Owing to the combination of the electroabsorption effect and change in the electrorefractive index in the MQW, the extinction ratio is significantly improved.