Here, we present an innovative integrated near-infrared Kerr comb sensor chip designed for the simultaneous detection of multi-gas. This sensor is comprised of a microcavity featuring a feedback arm for backward coupling and a compact air-slotted sensing element. The microcavity used to form the optical comb has a symmetric dual-spiral structure with an ultra-high resolution of the absorbance spectrum and a roundtrip length of roughly 1.46 μm, which corresponds to a low repetition frequency of about 9.82 GHz. Through the application of horizontal single-slotted structured silicon nitride (Si3N4) waveguides, optimized dispersion engineering of the microcavity can be achieved, resulting in spectra with an octave-spanning bandwidth. The sensing element employs a large-length waveguide, instead of a conventional discrete gas absorption cell, which brings high compactness. By optimizing the degree of thermally tuned interference and pumping parameters of the microcavity structure, a coupling-free light source in the form of a multi-soliton comb with a pump-comb conversion efficiency of over 50% can be achieved. The sensor performance is accurately evaluated through theoretical simulations of noise-containing absorption spectra of multiple gases, confirming its applicability.
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