A ring-mirrors-integrated silicon photonics arrayed waveguide grating

In this letter, we demonstrated a 1×4 folded silicon photonics arrayed waveguide grating integrated with ring-mirrors at the end of arrayed waveguides on SOI platform. Each reflective ring-mirror is composed of a 1×2 MMI splitter/combiner and a bend silicon nanowire waveguide in the end of each arrayed waveguide. Compared to a normal arrayed waveguide grating, the structure of the ring-mirror-integrated arrayed waveguide grating is only half. The measured transmission loss is about 3.5 dB and the crosstalk is around 20 dB. The measured channel spacing is 6.7 nm.