Design of hybrid free-space wavelength-division multiplexers for integration

We design a hybrid free-space wavelength-division multiplexers (MUX) that favor integration of matured high performance grating-based MUX and planar waveguide devices. By optimizing the component interfaces, we pursuit a divide-and-conquer method in the proposed hybrid integration. Meanwhile, a novel 6-channel coarse MUX based on layered diffractive optics is successfully designed. These two methods combined are promising in integrating multiple optical functions with cost-effective mass production.