Fig. 6: Towards microcomb-interposer integration.
a Schematic showing integration of the microcomb and interposer photonics layers that are interfaced by a bilayer taper that can transfer an octave of comb bandwidth with negligible loss. b, c Simulations of a 100-μm-long bilayer taper showing low-loss broadband transfer of light. d Broadband microcomb, along with the corresponding sech2 fit, measured from a fabricated bilayer chip where the microcomb output is extracted through the bilayer taper into the interposer layer
