Efficient grating couplers for optical fibers to ultra-low-loss waveguides

Yongjun Guo; Zhuang Ma; Xin Tong; Lin Zhang

doi:10.1117/12.2609349

5 March 2022 Efficient grating couplers for optical fibers to ultra-low-loss waveguides

Yongjun Guo, Zhuang Ma, Xin Tong, Lin Zhang

Proceedings Volume 12006, Silicon Photonics XVII; 1200606 (2022) https://doi.org/10.1117/12.2609349
Event: SPIE OPTO, 2022, San Francisco, California, United States

Abstract

Grating couplers are one of the building blocks in silicon (Si) photonics. A lithium niobate-on-insulator (LNOI) platform has a wide transparency window, an exceptional electro-optic performance, and a favorable mechanical property. Here we propose a grating coupler on the LNOI platform for an optical fiber to an ultra-low-loss silicon nitride (Si₃N₄) waveguide. Titanium dioxide (TiO₂) has a negative thermo-optic coefficient and can be used to compensate the temperature drift of cores with positive thermo-optic coefficients. Here, a TiO₂ layer on the high-aspect-ratio Si₃N₄ core is used for the athermal operation. The fundamental TE mode at a wavelength of 1550 nm is used as an input from the ultra-low-loss waveguide. We achieve a high directionality of 68% at the fixed wavelength. A coupling efficiency of 48% can be obtained. A 3-dB bandwidth of 60 nm from 1520 to 1580 nm is presented by the proposed grating coupler.

Conference Presentation

Citation Download Citation

Yongjun Guo, Zhuang Ma, Xin Tong, and Lin Zhang "Efficient grating couplers for optical fibers to ultra-low-loss waveguides", Proc. SPIE 12006, Silicon Photonics XVII, 1200606 (5 March 2022); https://doi.org/10.1117/12.2609349

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