A proposal for the generation of optical frequency comb in temperature insensitive microcavity |
(a) Schematic of an all-pass microring resonator constructed by PUA-cladding silicon nitride slotted waveguide. (b) The corresponding waveguide cross section. (c) Second-order dispersion versus wavelength for different waveguide. (d) Effective refractive index of the waveguide versus temperature. The red, blue, and green curves represent strip waveguide, slot waveguide with SiO2 cladding, and slot waveguide with PUA cladding, respectively. |