High coupling efficiency and ultra-wide bandwidth fiber-to-chip interface for lithium niobate photonic integrated circuits

Pengcheng Xie

doi:10.1117/12.2642850

23 January 2023 High coupling efficiency and ultra-wide bandwidth fiber-to-chip interface for lithium niobate photonic integrated circuits

Pengcheng Xie

Author Affiliations +

Proceedings Volume 12556, AOPC 2022: Optoelectronics and Nanophotonics; 1255608 (2023) https://doi.org/10.1117/12.2642850
Event: Applied Optics and Photonics China 2022 (AOPC2022), 2022, Beijing, China

Abstract

Thin-film lithium-niobate-on-insulator (LNOI) is a promising platform for nonlinear optics and optical interconnect. It is critical to realize high efficiency for coupling optical signal into lithium niobate photonic integrated circuits. Here we demonstrate a low-loss edge coupler for coupling between a standard optical fiber and sub-micrometer LN strip waveguides. The coupler consists of an inverse tapered mode size converter, as well as a tapered SU-8 polymer curved waveguide which functions an interface between the single-mode optical fiber and the mode size converter. The simulation shows that coupling efficiencies for TE mode and TM mode are -0.42 dB and -0.75 dB at 1550nm, respectively. The coupling efficiency is higher than -0.77 dB for both TE and TM mode in wavelength range of 1450 nm to 1650 nm. This means that our edge coupler has polarization insensitivity and ultra-wide bandwidth.

Citation Download Citation

Pengcheng Xie "High coupling efficiency and ultra-wide bandwidth fiber-to-chip interface for lithium niobate photonic integrated circuits", Proc. SPIE 12556, AOPC 2022: Optoelectronics and Nanophotonics, 1255608 (23 January 2023); https://doi.org/10.1117/12.2642850

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