Journal
OPTICS EXPRESS
Volume 28, Issue 20, Pages 29644-29661Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.400413
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Funding
- National Aeronautics and Space Administration the early career faculty (ECF) award [80NSSC17K052]
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The large electro-optic coefficient, r(33), of thin-film lithium niobate (LN) on insulator makes it an excellent material platform for high-efficiency optical modulators. Using the fundamental transverse magnetic optical mode in Z-cut LN enables isotropic in-plane devices; however, realizing a strong vertical electric field to capitalize on r(33) has been challenging. Here we present a symmetric electrode configuration to boost the vertical field strength inside a fully-etched single-mode LN waveguide. We use this design paradigm to demonstrate an ultra-compact fully isotropic microring modulator with a high electro-optic tuning efficiency of 9 pm/V, extinction ratio of 20dB, and modulation bandwidth beyond 28 GHz. Under quasi-static operation, the tuning efficiency of the modulator reaches 20 pmN. Fast, efficient, high-contrast modulation will be critical in future optical communication systems while large quasi-static efficiency will enable post-fabrication trimming, thermal compensation, and even complete reconfiguration of microring-based sensor arrays and photonic integrated circuits. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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