4.6 Article

Compact thin film lithium niobate folded intensity modulator using a waveguide crossing

Journal

OPTICS EXPRESS
Volume 30, Issue 6, Pages 9193-9207

Publisher

OPTICAL SOC AMER
DOI: 10.1364/OE.453050

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Funding

  1. Air Force Research Laboratory [FA8650-18-C-1734]

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This study reports a hybrid silicon nitride and lithium niobate folded electro-optic Mach Zehnder modulator, which features small footprint, low voltage, and wide bandwidth. The modulator demonstrates promising performance.
A small footprint, low voltage and wide bandwidth electro-optic modulator is critical fir applications ranging from optical communications to analog photonic links, and the integration of thin-film lithium niobate with photonic integrated circuit (PIC) compatible materials remains paramount. Here, a hybrid silicon nitride and lithium niobate folded electro-optic Mach Zehnder modulator (MZM) which incorporates a waveguide crossing and 3 dB multimode interference (MMI) couplers for splitting and combining light is reported. This modulator has an effective interaction region length of 10 mm and shows a DC half wave voltage of roughly 4.0 V, or a modulation efficiency (V pi.L) of roughly 4 V.cm. Furthermore, the device demonstrates a power extinction ratio of roughly 23 dB and shows .08 dB/GHz optical sideband power roll-off with index matching fluid up to 110 GHz, with a 3-dB bandwidth of 37.5 GHz. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

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