Low-loss on-chip prism-waveguide coupler to high-Q micro-resonator and optical frequency comb generation

We design, fabricate and characterize first on-chip prism-like waveguide (prism-waveguide) coupler to high-Q (Q>10
¹⁰
) micro-resonator with record 1.1dB coupling loss at 1550nm and demonstrate an integrated optical frequency comb (OFC) generation unit based on this coupler.