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<p>Free-space optical communication with high transmission bandwidth and small antenna size has been progressively deployed for ground-air-space communications in recent years. However, current mitigation methods, including adaptive optics and transmitter-side beam shaping, are often limited by design complexity and insufficient bandwidth. Here, we propose a receiver-side wavefront correction scheme based on optical pin beam—a ring-shaped, self-healing beam structure—formed via a static phase mask in front of the coupling lens. Unlike traditional optical pin beam methods requiring transmitter-side modulation, our design proactively reshapes the aberrated receiving beam into a stable optical pin beam with extended Rayleigh length, thereby improving mode matching and enhancing coupling resilience under turbulence. In a kilometer-scale outdoor experiment, we demonstrate a 100 Gbps free-space laser link, with coupled power stability increased by 26% and bit error rate decreased by up to 2 orders of magnitude compared with a Gaussian receiver. This receiver-side-only solution simplifies system architecture, ensures high-power compatibility, and offers a low-cost and scalable pathway for future optical ground stations, paving the way for ultra-long-distance, high-speed, and compact Free-space optical communication systems.</p>

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High-performance 100 Gbps free-space optical communication via optical pin beam receiver

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月27日

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  • Meiling Guan,
  • Yang Liu,
  • Huahua Wang,
  • Hongyue Xiao,
  • Hongpeng Lu,
  • Hongman Zhang,
  • Hongwei Jiang,
  • Chengming Sun,
  • Huijian Liang,
  • Changzhi Xu,
  • Lu Gao,
  • Haiping Mei,
  • Yan Li,
  • Jian Wu,
  • Zhigang Chen,
  • Ze Zhang

摘要

Free-space optical communication with high transmission bandwidth and small antenna size has been progressively deployed for ground-air-space communications in recent years. However, current mitigation methods, including adaptive optics and transmitter-side beam shaping, are often limited by design complexity and insufficient bandwidth. Here, we propose a receiver-side wavefront correction scheme based on optical pin beam—a ring-shaped, self-healing beam structure—formed via a static phase mask in front of the coupling lens. Unlike traditional optical pin beam methods requiring transmitter-side modulation, our design proactively reshapes the aberrated receiving beam into a stable optical pin beam with extended Rayleigh length, thereby improving mode matching and enhancing coupling resilience under turbulence. In a kilometer-scale outdoor experiment, we demonstrate a 100 Gbps free-space laser link, with coupled power stability increased by 26% and bit error rate decreased by up to 2 orders of magnitude compared with a Gaussian receiver. This receiver-side-only solution simplifies system architecture, ensures high-power compatibility, and offers a low-cost and scalable pathway for future optical ground stations, paving the way for ultra-long-distance, high-speed, and compact Free-space optical communication systems.