Rhythmic soliton interactions for integrated dual-microcomb spectroscopy
arxiv(2024)
摘要
Rotation symmetry of microresonators supports the generation of phase-locked
counter-propagating (CP) solitons that can potentially miniaturize dual-comb
systems. Realization of these dual-comb compatible solitons in photonic
integrated circuits remains a challenge. Here, we synthesized such CP solitons
in an integrated silicon nitride microresonator and observed forced soliton
oscillation due to rhythmic, time-varying soliton interactions. The
interactions result in seconds mutual-coherence passively. Temporal motion in
the soliton streams is discerned by measuring a quadratic-scaling frequency
noise peaks and an inverse quadratic-scaling microcomb sidebands. By generating
a CP soliton trimer to have two synchronized solitons in one of the orbiting
directions, we resolve the incapability of measuring two unsynchronized CP
soliton dimer pulses by optical cross-correlation, and show CP solitons undergo
complex motion trajectory. We further prove that precise dual-comb spectroscopy
with an acquisition time as short as 0.6 μs is feasible using these
solitons, although the temporal motion limits the dynamic range. Besides
revealing soliton interactions with different group velocities, our work
propels the realization of photonic integrated dual-comb spectrometers with
high passive coherence.
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