High-speed short-wavelength infrared (SWIR)/mid-wavelength infrared (MWIR) have a wide range of applications in emerging areas such as free-space communications, 2 µm optics fiber communication, dual-frequency comb spectroscopy, chemical sensing, and LIDAR. Our group works on InP based on InGaAs/GaAsSb type-II superlattice for high-speed SWIR photodiodes applications, which enjoys the mature process technologies developed by InP-based fiber optics communications. In the MWIR region, our group mainly focuses on the InAs/InAsSb and InAs/GaSb type-II superlattice for high-speed MWIR detection.