In this paper, a novel 1×2 MMI coupler is proposed in the 3 m thick-silicon platform, which is based on rib input/output waveguide and strip multimode core waveguide. The hybrid waveguide structure can achieve a low-loss optical transmission with 0.017 dB at 1550 nm which is a comparable performance of traditional strip MMI coupler. In addition, the proposed structure can directly join the power splitter with other optical element such as ultra-low-loss single-mode rib waveguide and high-speed electro-optical Mach-Zehnder interferometers, which is a strong candidate for the conventional waveguide transformer between strip coupler and rib modulator.
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