High-speed electro-optic modulation in topological interface states of a one-dimensional lattice

Light: Science & Applications

Article

Ming Liu¹  Jian Xu¹  Ying Wang¹  Yonghui Tian²  Yong Zhang³  Lu Sun³  Chenglong Feng³  Jian Shen³  Lei Zhang³  Yikai Su³  Hongwei Wang³  Jingchi Li³  Jianwen Dong⁴ 

[1] Center for Advanced Electronic Materials and Devices, Shanghai Jiao Tong University, 200240, Shanghai, China;Institute of Microelectronics and Key Laboratory for Magnetism and Magnetic Materials of MOE, School of Physical Science and Technology, Lanzhou University, 730000, Lanzhou, Gansu, China;State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, 200240, Shanghai, China;State Key Laboratory of Optoelectronic Materials and Technologies & School of Physics, Sun Yat-sen University, 510275, Guangzhou, China;

关键词: ;   

DOI  :  10.1038/s41377-023-01251-x

 received in 2023-02-06, accepted in 2023-08-03,  发布年份 2023

来源: Springer

【 摘 要 】

Electro-optic modulators are key components in data communication, microwave photonics, and quantum photonics. Modulation bandwidth, energy efficiency, and device dimension are crucial metrics of modulators. Here, we provide an important direction for the miniaturization of electro-optic modulators by reporting on ultracompact topological modulators. A topological interface state in a one-dimensional lattice is implemented on a thin-film lithium-niobate integrated platform. Due to the strong optical confinement of the interface state and the peaking enhancement of the electro-optic response, a topological cavity with a size of 1.6 × 140 μm2 enables a large modulation bandwidth of 104 GHz. The first topological modulator exhibits the most compact device size compared to reported LN modulators with bandwidths above 28 GHz, to the best of our knowledge. 100 Gb/s non-return-to-zero and 100 Gb/s four-level pulse amplitude modulation signals are generated. The switching energy is 5.4 fJ/bit, owing to the small electro-optic mode volume and low capacitance. The topological modulator accelerates the response time of topological photonic devices from the microsecond order to the picosecond order and provides an essential foundation for the implementation of large-scale lithium-niobate photonic integrated circuits.

【 授权许可】

CC BY   
© Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP), CAS 2023

【 图 表 】

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