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- W4225535718 abstract "Compact thin-film lithium niobate (TFLN) modulators with low half-wave voltage <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$text{V}_{pi }$ </tex-math></inline-formula> are highly desirable for many applications. In particular, modulators with <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$text{V}_{pi }~sim ~1$ </tex-math></inline-formula> V would allow direct driving by CMOS circuits, but they normally require a long modulation length of several centimeters. Folded TFLN modulators exhibit reduced <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$text{V}_{pi }$ </tex-math></inline-formula> together with a small device footprint. However, previously reported schemes suffer from complicated device fabrication procedure to maintain the relative direction of electric field with respect to the TFLN crystal polarization after electrode folding. In this work, a meandered X-cut TFLN Mach–Zehnder (MZ) modulator with specially designed capacitively-loaded traveling-wave electrodes (CL-TWEs) is demonstrated. Interdigitated T-rails are employed to reverse the electric field in the folded region for continuous accumulation of optical phase shift. Ultra-low <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$text{V}_{pi }$ </tex-math></inline-formula> of 1.08 V is achieved on an 8-mm-long modulator containing three-segments of 7-mm-long modulation sections, together with a 3-dB electro-optic bandwidth around 43 GHz. The broadband meandered modulator with ultra-low half-wave voltage as well as a compact footprint has the potential to be directly driven by CMOS electronics." @default.
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- W4225535718 date "2022-04-15" @default.
- W4225535718 modified "2023-10-17" @default.
- W4225535718 title "Broadband Meandered Thin-Film Lithium Niobate Modulator With Ultra-Low Half-Wave Voltage" @default.
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- W4225535718 doi "https://doi.org/10.1109/lpt.2022.3164794" @default.
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