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Self-referenced dissipative Kerr solitons (DKSs) based on opticalmicroresonators offer prominent characteristics including miniaturization, lowpower consumption, broad spectral range and inherent coherence for variousapplications such as precision measurement, communications, microwavephotonics, and astronomical spectrometer calibration. To date, octave-spanningDKSs with a free spectral range (FSR) of ~1 THz have been achieved only inultrahigh-Q silicon nitride microresonators, with elaborate wavelength controlrequired. Here we demonstrate an octave-spanning DKS in an aluminium nitride(AlN) microresonator with moderate loaded Q (500,000) and FSR of 374 GHz. Inthe design, a TE00 mode and a TE10 mode are nearly degenerate and act as pumpand auxiliary modes. The presence of the auxiliary resonance balances thethermal dragging effect in dissipative soliton comb formation, cruciallysimplifying the DKS generation with a single pump and leading to a wide singlesoliton access window. We experimentally demonstrate stable DKS operation witha record single soliton step (~80 pm) and octave-spanning bandwidth (1100-2300nm) through adiabatic pump tuning and on-chip power of 340 mW. Our scheme alsoallows for direct creation of the DKS state with high probability and withoutelaborate wavelength or power schemes being required to stabilize the solitonbehavior.

Directly accessing octave-spanning dissipative Kerr soliton frequency combs in an AlN microring resonator