Fig. 3: Demonstration applications using the germano-silicate platform.
From: Towards fibre-like loss for photonic integration from violet to near-infrared
a, Dispersion of a Ge-silica single-ring resonator, Dint = ωμ − ω0 − D1μ, where μ = 0 is assigned to the mode at 1,550 nm, D1/2π is the mean free spectral range and D2 is the group velocity dispersion (GVD) (positive for anomalous GVD). A fitting gives D1/2π = 21.2 GHz and D2/2π = 8.9 kHz. Inset, soliton step in transmission. b, Optical spectrum of generated soliton microcomb (left) and radiofrequency spectrum of microcomb beatnote (right). RBW, resolution bandwidth. c, Measured SBS gain spectrum of a fully cladded Ge-silica waveguide. The simulation result is overlaid on the measurement response. Insets, electric-field mode profile of the fundamental TE mode (left) and Brillouin-scattering induced displacement response (right). d, Optical spectrum of stimulated Brillouin laser (left) and radiofrequency spectrum of SBL beatnote (right). a.u., arbitrary units.
