High-efficiency suspended three-tip edge coupler for Mid-infrared photonics

A high-efficiency suspended three-tip edge coupler based on a silicon-on-insulator (SOI) platform for fiber-to-chip coupling in Mid-infrared (MIR) region is designed. The device is composed of a three-tip edge coupler and subwavelength grating (SWG) waveguides. The edge coupler is suspended in order to avoid the high absorption loss from the Silicon dioxide (SiO2) in the SOI substrate in MIR. The three tips of the suspended edge coupler increase...