High-performance coherent optical modulators based on thin-film lithium niobate platform

Mengyue Xu, Mingbo He, Hongguang Zhang, Jian Jian, Ying Pan, Xiaoyue Liu, Lifeng Chen, Xiangyu Meng, Hui Chen, Zhaohui Li, Xi Xiao (), Shaohua Yu, Siyuan Yu and Xinlun Cai ()
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Mengyue Xu: Sun Yat-sen University
Mingbo He: Sun Yat-sen University
Hongguang Zhang: China Information and Communication Technologies Group Corporation (CICT)
Jian Jian: Sun Yat-sen University
Ying Pan: Sun Yat-sen University
Xiaoyue Liu: Sun Yat-sen University
Lifeng Chen: Sun Yat-sen University
Xiangyu Meng: Sun Yat-sen University
Hui Chen: Sun Yat-sen University
Zhaohui Li: Sun Yat-sen University
Xi Xiao: China Information and Communication Technologies Group Corporation (CICT)
Shaohua Yu: China Information and Communication Technologies Group Corporation (CICT)
Siyuan Yu: Sun Yat-sen University
Xinlun Cai: Sun Yat-sen University

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract The coherent transmission technology using digital signal processing and advanced modulation formats, is bringing networks closer to the theoretical capacity limit of optical fibres, the Shannon limit. The in-phase/quadrature electro-optic modulator that encodes information on both the amplitude and the phase of light, is one of the underpinning devices for the coherent transmission technology. Ideally, such modulator should feature a low loss, low drive voltage, large bandwidth, low chirp and compact footprint. However, these requirements have been only met on separate occasions. Here, we demonstrate integrated thin-film lithium niobate in-phase/quadrature modulators that fulfil these requirements simultaneously. The presented devices exhibit greatly improved overall performance (half-wave voltage, bandwidth and optical loss) over traditional lithium niobate counterparts, and support modulation data rate up to 320 Gbit s−1. Our devices pave new routes for future high-speed, energy-efficient, and cost-effective communication networks.

Date: 2020
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DOI: 10.1038/s41467-020-17806-0

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