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17 April 2020 Design and fabrication of cantilevered fiber-to-waveguide mode size converter for thin-film lithium niobate photonic integrated circuits
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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.
© (2020) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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