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The AlN micro-ring provides an ideal platform for the study of soliton-comb spectra. The reflective Pancharatnam–Berry (PB) metasurface implements a programmable geometric-phase mapping from polarization to orbital angular momentum (OAM). The challenge is to match the frequency-domain multiplicity of micro-comb teeth with the spatial-mode multiplicity of OAM channels in a complete channel-space description. We use a tensor-product space of frequency, polarization (spin), spatial ports, and OAM: an on-chip demultiplexer (DE-MUX; WDM) stage performs frequency channelization, while polarization optics provides per-tooth projection between linear and circular bases. Scalar diffraction and annular Fourier decomposition are used to evaluate tooth-resolved intensity/phase profiles and OAM purity/crosstalk. Our results clarify end-to-end information pathways across all channel dimensions. The vortex soliton micro-combs hold significant implications for high-dimensional precision spectroscopy of optical vortices, high-capacity communication links, high-dimensional parallel sensing, and multi-channel coherent information processing.
Lv et al. (Fri,) studied this question.
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