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<p>As AI data centers scale rapidly in throughput and size, the deployment and management complexity of fiber-connected interconnects is becoming a key bottleneck. Optical wireless communication (OWC) offers a flexible alternative to cabled interconnects, yet its per-channel data rates have historically lagged behind those of wired counterparts due to limited electro-optic bandwidth and front-end distortions. In this work, we narrow this gap through end-to-end co-design of the transceiver front ends, packaging interfaces, and nonlinear equalization algorithms, which together shape an effectively wideband, controlled-impedance electrical channel. Guided by systematic interface modeling, the proposed co-packaged solution eliminates the impedance discontinuity via dedicated transmission line design and an inductance-reduced bond-wire scheme, effectively extending the analog bandwidth while suppressing resonant peaking. To further mitigate residual level-dependent nonlinear intersymbol interference (ISI), an offline third-order Volterra-series nonlinear equalizer (VNE) is employed. Leveraging this hardware–algorithm synergy, we experimentally demonstrate a four-channel transceiver module that achieves record-high 100&#xa0;Gb/s NRZ and 160&#xa0;Gb/s PAM-4 per channel (640&#xa0;Gb/s aggregate) over a 50&#xa0;cm free-space link. To the best of our knowledge, this is the first multi-channel intensity-modulation and direct-detection (IM/DD) OWC system to attain wired-class performance, providing a scalable pathway for deploying high-speed OWC in next-generation data centers.</p>

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Ultra-fast co-packaged optical wireless link for wireless-assisted data center interconnection

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月29日

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  • Peng Yan,
  • Shenghui Wu,
  • Yunhao Zhang,
  • Yu Sun,
  • Bitao Shen,
  • Zhen Zhen,
  • Xiaobin Liu,
  • Linshan Yang,
  • Qijie Xie,
  • Jun Qin,
  • Lei Wang,
  • Haowen Shu,
  • Xingjun Wang

摘要

As AI data centers scale rapidly in throughput and size, the deployment and management complexity of fiber-connected interconnects is becoming a key bottleneck. Optical wireless communication (OWC) offers a flexible alternative to cabled interconnects, yet its per-channel data rates have historically lagged behind those of wired counterparts due to limited electro-optic bandwidth and front-end distortions. In this work, we narrow this gap through end-to-end co-design of the transceiver front ends, packaging interfaces, and nonlinear equalization algorithms, which together shape an effectively wideband, controlled-impedance electrical channel. Guided by systematic interface modeling, the proposed co-packaged solution eliminates the impedance discontinuity via dedicated transmission line design and an inductance-reduced bond-wire scheme, effectively extending the analog bandwidth while suppressing resonant peaking. To further mitigate residual level-dependent nonlinear intersymbol interference (ISI), an offline third-order Volterra-series nonlinear equalizer (VNE) is employed. Leveraging this hardware–algorithm synergy, we experimentally demonstrate a four-channel transceiver module that achieves record-high 100 Gb/s NRZ and 160 Gb/s PAM-4 per channel (640 Gb/s aggregate) over a 50 cm free-space link. To the best of our knowledge, this is the first multi-channel intensity-modulation and direct-detection (IM/DD) OWC system to attain wired-class performance, providing a scalable pathway for deploying high-speed OWC in next-generation data centers.