Effect of Thermal Tuning and Mode Coupling On Soliton Microcombs in AlN Microresonators

Optical resonator-based Kerr frequency combs allow an ultra-precise time and measurements for a wide range of applications including ranging, biosensing, high-capacity communications, quantum information technology. solitons are coherent that crucial synthesizer chronometric instruments. The behavior the soliton is determined by multiple factors while key challenge stable operation to maintain thermal equilibrium in resonator. In this work, owing stabilizing effect caused neighboring auxiliary mode (TE10), we demonstrate generation octave-spanning (1100-2380 nm) single-soliton within laser detuning (up 16 GHz) pumping TE00 mode. influence temperature on microcombs also explored. Firstly, diverse two-solitons achieved adjusting temperature. Secondly, access possibility reduced when further increasing due avoided crossing between pump (TE00) another adjacent fundamental transverse-magnetic At same time, spectral bandwidth microcomb originates from TM00 modes significantly enhanced. Finally, show carrier offset frequency, which evaluated be ∼30-40 GHz, increases as increased.