Study of backend waveguide arrays for adiabatic coupling to Si waveguides

We compare the performances of different spot size converter (SSC) designs consisting of backend waveguide arrays (“dot-like”, “cross-like”, “stripes”, “box”) at the facet, adiabatically coupled to tapered Si waveguides. For the study, we use SiON waveguides and a low index step “box” waveguide.