Lightwave Circuits in Lithium Niobate through Hybrid Waveguides with Silicon Photonics

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Abstract

We demonstrate a photonic waveguide technology based on a two-material core, in which light is controllably and repeatedly transferred back and forth between sub-micron thickness crystalline layers of Si and LN bonded to one another, where the former is patterned and the latter is not. In this way, the foundry-based wafer-scale fabrication technology for silicon photonics can be leveraged to form lithium-niobate based integrated optical devices. Using two different guided modes and an adiabatic mode transition between them, we demonstrate a set of building blocks such as waveguides, bends, and couplers which can be used to route light underneath an unpatterned slab of LN, as well as outside the LN-bonded region, thus enabling complex and compact lightwave circuits in LN alongside Si photonics with fabrication ease and low cost.

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Weigel, P. O., Savanier, M., Derose, C. T., Pomerene, A. T., Starbuck, A. L., Lentine, A. L., … Mookherjea, S. (2016). Lightwave Circuits in Lithium Niobate through Hybrid Waveguides with Silicon Photonics. Scientific Reports, 6. https://doi.org/10.1038/srep22301

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