{"paper":{"title":"Robust and Active Visible-Light Integrated Photonics on Thin-Film Lithium Tantalate for Underwater Optical Wireless Communications","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"Thin-film lithium tantalate enables stable 50-GHz modulators at 532 nm for high-speed underwater optical links.","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Changjian Guo, Jiajie Deng, Kaixuan Chen, Liu Liu, Sailing He, Weilong Ma, Wenchang Yang, Xiaofeng Wu, Xingjie Li, Ziliang Ruan","submitted_at":"2026-03-15T12:30:12Z","abstract_excerpt":"Visible-light integrated photonics enables compact platforms for sensing, precision metrology, and free-space data links at visible wavelengths. However, many applications remain limited by the lack of high-speed and robust modulators in the blue-green band. Here we report, both operating at 532 nm, thin-film lithium tantalate waveguides of propagation losses of dB/cm scale and modulators with a flat frequency response to ~50 GHz. The modulator remains stable when delivering 5 dBm modulated optical power for an hour, which cannot be achieved by thin-film lithium niobate based counterparts unde"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"thin-film lithium tantalate waveguides of propagation losses of dB/cm scale and modulators with a flat frequency response to ~50 GHz. The modulator remains stable when delivering 5 dBm modulated optical power for an hour... System-level underwater optical wireless communication (UWOC) is validated with 112-Gb/s transmission over 3-m and 64-Gb/s transmission over 9-m underwater links. This represents the first integrated external modulator based UWOC system.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"That the reported low losses, 50 GHz bandwidth, and one-hour stability at 5 dBm are reproducible across fabricated devices and that the 3 m and 9 m underwater links capture the dominant practical impairments without additional unstated losses or distortions.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Thin-film lithium tantalate delivers stable 50 GHz modulators at 532 nm, supporting 112 Gb/s UWOC over 3 m and 64 Gb/s over 9 m underwater.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Thin-film lithium tantalate enables stable 50-GHz modulators at 532 nm for high-speed underwater optical links.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"8c592dbb18ccc3eeeda03f9b0a948fd29f5f27eb067dfbd90bde8e7e739d90fb"},"source":{"id":"2603.14346","kind":"arxiv","version":2},"verdict":{"id":"f323d268-1ce1-4e1f-8578-ee2bc4859cb8","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-15T11:33:26.659014Z","strongest_claim":"thin-film lithium tantalate waveguides of propagation losses of dB/cm scale and modulators with a flat frequency response to ~50 GHz. The modulator remains stable when delivering 5 dBm modulated optical power for an hour... System-level underwater optical wireless communication (UWOC) is validated with 112-Gb/s transmission over 3-m and 64-Gb/s transmission over 9-m underwater links. This represents the first integrated external modulator based UWOC system.","one_line_summary":"Thin-film lithium tantalate delivers stable 50 GHz modulators at 532 nm, supporting 112 Gb/s UWOC over 3 m and 64 Gb/s over 9 m underwater.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"That the reported low losses, 50 GHz bandwidth, and one-hour stability at 5 dBm are reproducible across fabricated devices and that the 3 m and 9 m underwater links capture the dominant practical impairments without additional unstated losses or distortions.","pith_extraction_headline":"Thin-film lithium tantalate enables stable 50-GHz modulators at 532 nm for high-speed underwater optical links."},"references":{"count":36,"sample":[{"doi":"","year":2024,"title":"Lu, X. et al. Emerging integrated laser technologies in the visible and short near -infrared regimes. Nat. Photon. 18, 1010–1023 (2024)","work_id":"140de00f-1bb0-449c-8513-203b6117c26d","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2024,"title":"Labonté, L. et al. Integrated photonics for quantum communications and metrology. PRX Quantum 5, 010101 (2024)","work_id":"1a044e80-0359-4fc1-a065-401cf41b4b86","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2021,"title":"Xiong, J. et al. Augmented reality and virtual reality displays: emerging technologies and future perspectives. Light Sci. Appl. 10, 216 (2021)","work_id":"eae786ce-22cf-48e3-bc7d-1707e16bf743","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2024,"title":"Yu, H. et al. Dual -functional triangular-shape micro-size light-emitting and detecting diode for on -chip optical communication in the deep ultraviolet band. Laser Photonics Rev. 18, 2300789 (2024)","work_id":"aee5fc90-9478-4751-83ed-53f0f4fdcd77","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2019,"title":"Desiatov B. et al. Ultra-low-loss integrated visible photonics using thin -film lithium niobate, Optica 6, 380-384 (2019)","work_id":"4a7139d7-2854-462d-8051-ba22cfa4e6b7","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":36,"snapshot_sha256":"18da9266fb3d6b4b0193809dc0788ef88a81014697ac166384b61aa1c29b34fb","internal_anchors":0},"formal_canon":{"evidence_count":1,"snapshot_sha256":"eede7c0b14ce262b2c5cd4bd2ede2134bd2b1ad3233ff38ac865f45b4d1bc33c"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}