摘要
Recently,high-performance thin-film lithium niobate optical modulators have emerged that,together with advanced multiplexing technologies,are highly expected to satisfy the ever-growing demand for high-capacity optical interconnects utilizing multiple channels.Accordingly,in this study,a compact lithium-niobate-on-insulator(LNOI)photonic chip was adopted to establish four-channel wavelength-division-multiplexing(WDM)transmitters,comprising four optical modulators based on ultracompact 2×2 Fabry-Perot cavities and a four-channel WDM filter based on multimode waveguide gratings.The fabricated chip with four wavelength channels has a total footprint as compact as 0.3×2.8 mm^(2),and exhibits an excess loss of~0.8 dB as well as low inter-channel crosstalk of<–22 dB.Using this LNOI photonic chip,high-capacity data transmissions of 320 Gbps(4×80 Gbps)on-off-keying signals and 400 Gbps(4×100 Gbps)four-level pulse amplitude signals were successfully realized with the ultra-low power consumption of 11.9 fJ/bit.
基金
the National Major Research and Development Program(No.2018YFB2200200/2018YFB2200201)
National Science Fund for Distinguished Young Scholars(61725503)
National Natural Science Foundation of China(NSFC)(91950205,61961146003,92150302,62105283,62205286)
Zhejiang Provincial Natural Science Foundation(LD19F050001)
Zhejiang Provincial Major Research and Development Program(No.2021C01199)
Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang(2021R01001)
the Fundamental Research Funds for the Central Universities.The authors thank the Westlake Center for Micro/Nano Fabrication for the partial facility support。
作者简介
Correspondence:Daoxin Dai(dxdai@zju.edu.cn)。
