Design and fabrication of cantilevered fiber-to-waveguide mode size converter for thin-film lithium niobate photonic integrated circuits

Guang Qian; Lexu Huang; Fengjie Zhou; Jie Tang; Xiangfei Chen; Yuechan Kong; Tangsheng Chen

doi:10.1117/12.2565387

17 April 2020 Design and fabrication of cantilevered fiber-to-waveguide mode size converter for thin-film lithium niobate photonic integrated circuits

Guang Qian, Lexu Huang, Fengjie Zhou, Jie Tang, Xiangfei Chen, Yuechan Kong, Tangsheng Chen

Author Affiliations +

Proceedings Volume 11455, Sixth Symposium on Novel Optoelectronic Detection Technology and Applications; 1145587 (2020) https://doi.org/10.1117/12.2565387
Event: Sixth Symposium on Novel Photoelectronic Detection Technology and Application, 2019, Beijing, China

Abstract

The recently emerged photonic integration technology based on thin-film lithium niobate (LN) have been regarded as a very promising candidate for advanced photonic integrated circuits (PICs) due to its attractive nonlinear properties, wide-spread use in electro-optic applications, and etc. Generally, the thin-film LN optical waveguide used in PICs is sub-micrometer scale. Mode mismatch between fiber and sub-micrometer LN waveguide in chip is the main factor of increasing the fiber-to-chip coupling loss and the total insertion loss of LN PICs. Therefore, for practical applications, low-loss mode size converter for coupling between fiber and sub-micrometer LN waveguide is essential. In this paper, an efficient and novel fiber-to-chip mode size converter for thin-film LN PICs was designed and fabricated. The converter consists of a LN nano-taper and a cantilevered SiO₂ waveguide. The nano-taper is embedded in the center of SiO₂ waveguide. Laterally connected SiO₂ cantilever beams are fabricated to provide structural support for the cantilevered SiO₂ waveguide. Our work provides an efficient way to realize low-loss fiber-to-chip interface for thin-film LN PICs.

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Guang Qian, Lexu Huang, Fengjie Zhou, Jie Tang, Xiangfei Chen, Yuechan Kong, and Tangsheng Chen "Design and fabrication of cantilevered fiber-to-waveguide mode size converter for thin-film lithium niobate photonic integrated circuits", Proc. SPIE 11455, Sixth Symposium on Novel Optoelectronic Detection Technology and Applications, 1145587 (17 April 2020); https://doi.org/10.1117/12.2565387

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