Coherent optical communications using coherence-cloned Kerr soliton microcombs

Yong Geng, Heng Zhou (), Xinjie Han, Wenwen Cui, Qiang Zhang, Boyuan Liu, Guangwei Deng, Qiang Zhou and Kun Qiu
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Yong Geng: University of Electronic Science and Technology of China
Heng Zhou: University of Electronic Science and Technology of China
Xinjie Han: University of Electronic Science and Technology of China
Wenwen Cui: University of Electronic Science and Technology of China
Qiang Zhang: University of Electronic Science and Technology of China
Boyuan Liu: University of Electronic Science and Technology of China
Guangwei Deng: University of Electronic Science and Technology of China
Qiang Zhou: University of Electronic Science and Technology of China
Kun Qiu: University of Electronic Science and Technology of China

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Dissipative Kerr soliton microcombs have been recognized as a promising multi-wavelength laser source for fiber optical communications, as their comb lines possess frequency and phase stability far beyond the independent lasers. Especially, for coherent optical communications, a highly beneficial but rarely explored target is to re-generate a Kerr soliton microcomb as the receiver local oscillators that conserve the frequency and phase property of the incoming data carriers, so that to enable coherent detection with minimized optical and electrical compensations. Here, via pump laser conveying and two-point locking, we implement re-generation of a Kerr soliton microcomb that faithfully clones the frequency and phase of another microcomb sent from 50 km away. Moreover, by using the coherence-cloned soliton microcombs as carriers and local oscillators, we demonstrate terabit coherent data interconnect, wherein traditional digital processes for frequency offset estimation are totally dispensed with, and carrier phase estimation is substantially simplified via slowed-down estimation rate per channel and joint estimation among multiple channels. Our work reveals that, in addition to providing a multitude of laser tones, regulating the frequency and phase of Kerr soliton microcombs among transmitters and receivers can significantly improve optical coherent communication in terms of performance, power consumption, and simplicity.

Date: 2022
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DOI: 10.1038/s41467-022-28712-y

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