Free-space terabit/s coherent optical links via platicon frequency microcombs

Wenting Wang; Hao Liu; Jiagui Wu; James F. McMillan; Dong IL Lee; Futai Hu; Wenzheng Liu; Jinghui Yang; Hangbo Yang; Abhinav Kumar Vinod; Yahya H. Ezzeldin; Christina Fragouli; Mingbin Yu; Patrick Guo-Qiang Lo; Dim-Lee Kwong; Devin S. Kahrs; Ninghua Zhu; Chee Wei Wong

doi:10.1186/s43593-025-00082-0

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Free-space terabit/s coherent optical links via platicon frequency microcombs

eLight 2025年5卷

Research Article | Updated：2025-12-01

- Free-space terabit/s coherent optical links via platicon frequency microcombs
- Free-space terabit/s coherent optical links via platicon frequency microcombs
- Affiliations：
- Author bio：
- Funds：
  
  Office of Naval Research;National Science Foundation
- DOI：10.1186/s43593-025-00082-0
  中图分类号：
- 收稿：2024-11-01，
  
  修回：2025-02-17，
  
  录用：2025-02-20，
  
  网络出版：2025-05-20，
  
  纸质出版：2025-12
- Accepted：
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Wenting Wang, Hao Liu, Jiagui Wu, 等. Free-space terabit/s coherent optical links via platicon frequency microcombs[J]. eLight, 2025,5.

Wenting Wang, Hao Liu, Jiagui Wu, et al. Free-space terabit/s coherent optical links via platicon frequency microcombs[J]. eLight, 2025, 5.
Wenting Wang, Hao Liu, Jiagui Wu, 等. Free-space terabit/s coherent optical links via platicon frequency microcombs[J]. eLight, 2025,5. DOI： 10.1186/s43593-025-00082-0.

Wenting Wang, Hao Liu, Jiagui Wu, et al. Free-space terabit/s coherent optical links via platicon frequency microcombs[J]. eLight, 2025, 5. DOI： 10.1186/s43593-025-00082-0.

摘要

Abstract

Coherent frequency microcombs

generated in nonlinear high-Q microresonators and driven by a single continuous-wave laser

have enabled several scientific breakthroughs in the past decade

thanks to their high intrinsic phase coherence and individual comb line powers. Here

we report terabit-per-second-scale coherent data communications over a free-space atmospheric link

using a platicon frequency microcomb

employing wavelength- and polarization-division multiplexing for next-generation optical wireless networks. Spanning more than 55 optical carriers with 115 GHz channel spacing

we report the first free-space coherent communication link using a frequency microcomb

achieving up to 8.21 Tbit/s aggregate data transmission at a 20 Gbaud symbol rate per carrier over 160 m

even under log-normal turbulent conditions. Utilizing 16-state quadrature amplitude modulation

we demonstrate retrieved constellation maps across the broad microcomb spectrum

achieving bit-error rates below both hard- and soft-decision thresholds for forward-error correction. Next

we examine a wavelength-division multiplexing free-space passive optical network as a baseline for free-space fronthaul

achieving an aggregate data rate of up to 5.21 Tbit/s and a field-tested spectral efficiency of 1.29 bit/s/Hz in the microcomb-based atmospheric link. We also quantify experimental power penalties of ≈ 3.8 dB at the error-correction threshold

relative to the theoretical additive white Gaussian noise limit. Furthermore

we introduce the first-ever demonstration of master–slave free-space carrier phase retrieval with frequency microcombs

and the compensation for turbulence-induced intensity scintillation and pointing error fluctuations

to improve end-to-end symbol error rates. This work provides a foundational platform for broadband vertical heterogeneous connectivity

terrestrial backbone links

and ground-satellite communication.

关键词

Keywords

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