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Parametric acoustic arrays offer a means to generate highly directive low-frequency fields from compact sources, while acoustic vortex beams carrying orbital angular momentum can encode digital information in their phase structure, quantified as their topological charge (TC). In this work, a three-dimensional mixed-domain split-step solver of the Westervelt equation is developed to model the simultaneous generation and propagation of multiple TCs via self-demodulation of vortex-bearing primary waves. Digital information is encoded using 8-bit ASCII mappings to TC channels and recovered using two metrics. Simulated results demonstrate successful recovery of six representative ASCII characters over meter-scale propagation distances from a \u223c40\u2009cm circular aperture in homogeneous water at 4\u2009kHz with a carrier frequency of 40\u2009kHz. A demultiplexing metric based on the Fourier series is introduced that captures the relative strength of constituent TCs as a function of distance from the central axis, informing the choice of amplitude weighting to improve detectability of higher-order TCs.<\/jats:p>","DOI":"10.1121\/10.0044565","type":"journal-article","created":{"date-parts":[[2026,8,12]],"date-time":"2026-08-12T12:12:33Z","timestamp":1786536753000},"page":"1413-1426","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Multiplexed parametric vortex beams for underwater communications"],"prefix":"10.1121","volume":"160","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-5876-9004","authenticated-orcid":false,"given":"Jeff","family":"Bell","sequence":"first","affiliation":[{"name":"Graduate Program in Acoustics, Pennsylvania State University , University Park, Pennsylvania 16802,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9972-8004","authenticated-orcid":false,"given":"Jia-Xin","family":"Zhong","sequence":"additional","affiliation":[{"name":"Graduate Program in Acoustics, Pennsylvania State University , University Park, Pennsylvania 16802,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2960-5292","authenticated-orcid":false,"given":"Yun","family":"Jing","sequence":"additional","affiliation":[{"name":"Graduate Program in Acoustics, Pennsylvania State University , University Park, Pennsylvania 16802,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"231","published-online":{"date-parts":[[2026,8,12]]},"reference":[{"issue":"3","key":"2026081207463173400_c1","doi-asserted-by":"publisher","first-page":"1671","DOI":"10.1121\/1.421258","article-title":"A simplified formula for viscous and chemical absorption in seawater","volume":"103","year":"1998","journal-title":"J. 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