Fig. 1: Dissipation engineering for dark pulse microcomb generation.
From: Broadband microwave-rate dark pulse microcombs in dissipation-engineered LiNbO3 microresonators
a Dissipation rate versus wavelength for microrings coupled to straight bus waveguides. κo: intrinsic loss; κext: external coupling loss. b Simulated optical spectrum and temporal profile of microcomb in microresonators without dissipation engineering. The color gradient indicates the Raman gain. c Simulated phase diagram as a function of pump power and laser-cavity detuning in microresonators without dissipation engineering. The normalization of detuning and pump power is defined in Methods, and the details of simulating the phase diagrams are provided in the supplementary information. d Dissipation rate versus wavelength for microrings coupled to pulley bus waveguides. e Simulated optical spectrum and temporal profile of microcomb in microresonators with dissipation engineering. f Simulated phase diagram as a function of pump power and laser-cavity detuning in microresonators with dissipation engineering. The blue area indicates the maximum existence range of dark pulses generated from an initial seed, which are determined by verifying their stability in the generalized Lugiato-Lefever equation.
