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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. 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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","authors_text":"Changjian Guo, Jiajie Deng, Kaixuan Chen, Liu Liu, Sailing He, Weilong Ma, Wenchang Yang, Xiaofeng Wu, Xingjie Li, Ziliang Ruan","cross_cats":[],"headline":"Thin-film lithium tantalate enables stable 50-GHz modulators at 532 nm for high-speed underwater optical links.","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2026-03-15T12:30:12Z","title":"Robust and Active Visible-Light Integrated Photonics on Thin-Film Lithium Tantalate for Underwater Optical Wireless Communications"},"references":{"count":36,"internal_anchors":0,"resolved_work":36,"sample":[{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":1,"title":"Lu, X. et al. Emerging integrated laser technologies in the visible and short near -infrared regimes. Nat. 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