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Express"],"published-print":{"date-parts":[[2026,2,9]]},"abstract":"<jats:p>Modal crosstalk is a fundamental limitation for orbital angular momentum (OAM)-based spatial-division multiplexing. Here, we introduce annular channel eigenmodes (ACEs) \u2014rigorously derived as the optimal band-limited solution for maximizing energy concentration within distinct annular channels. This approach reformulates the design as a Hermitian eigenvalue problem, efficiently yielding optimal beams that are physically isolated in space. Numerical simulations demonstrate that under identical conditions, conventional Gaussian-enveloped perfect optical vortices (POVs) exhibit an average modal crosstalk of \u221216\u00a0dB, whereas ACEs suppress crosstalk to nearly \u221230\u00a0dB. Moreover, the crosstalk suppression of ACEs continues to improve exponentially with increasing channel width, while that of POVs saturates at a fundamental limit. We experimentally generated ACEs and confirmed a 36% enhancement in energy confinement relative to POVs. ACEs thus provide a physically robust basis for high-fidelity, high-density OAM communications.<\/jats:p>","DOI":"10.1364\/oe.584497","type":"journal-article","created":{"date-parts":[[2026,1,20]],"date-time":"2026-01-20T04:00:10Z","timestamp":1768881610000},"page":"4396","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Annular channel eigenmodes: a physical-layer approach to suppressing OAM modal crosstalk"],"prefix":"10.1364","volume":"34","author":[{"given":"ChengHao","family":"Li","sequence":"first","affiliation":[{"name":"University of Science and Technology of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"PengYang","family":"An","sequence":"additional","affiliation":[{"name":"University of Science and Technology of China"},{"name":"State Key Laboratory of Opto-Electronic Information Acquisition and Protection Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ziao","family":"Huang","sequence":"additional","affiliation":[{"name":"University of Science and Technology of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8745-4213","authenticated-orcid":true,"given":"QiWen","family":"Zhan","sequence":"additional","affiliation":[{"name":"University of Shanghai for Science and Technology"},{"name":"Westlake University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4585-9711","authenticated-orcid":true,"given":"GuangHui","family":"Yuan","sequence":"additional","affiliation":[{"name":"University of Science and Technology of China"},{"name":"State Key Laboratory of Opto-Electronic Information Acquisition and Protection Technology"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,1,29]]},"reference":[{"key":"oe-34-3-4396-R1","doi-asserted-by":"publisher","first-page":"313","DOI":"10.1038\/35085529","type":"journal-article","volume":"412","author":"Mair","year":"2001","journal-title":"Nature"},{"key":"oe-34-3-4396-R2","doi-asserted-by":"publisher","first-page":"488","DOI":"10.1038\/nphoton.2012.138","type":"journal-article","volume":"6","author":"Wang","year":"2012","journal-title":"Nat. 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