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<p>Space division multiplexing (SDM), particularly multi-core fiber (MCF) technology, represents a promising solution for high-density cabling in duct-constrained scenarios such as submarine cable systems. Although recent laboratory experiments and prototype trials have demonstrated the feasibility of MCF-based submarine cables, a complete optical communication validation of a real-world MCF submarine cable link incorporating optical amplifiers has remained a critical necessity. Here, we demonstrate a field validation of the MCF submarine cable communication with an end-to-end system. Based on a field-deployed 7-core fiber submarine cable infrastructure, we achieved a record-breaking net transmission rate of 410.5 Tbit·s<sup>-1</sup> over a 140 km 7-core fiber cable link by employing the matched C + L Band cladding-pumped 7-core MC-EDFA. The measurements indicate slight variation in attenuation and crosstalk compared to the pre-cabling conditions, confirming the MCF’s robustness to deployment and submarine disturbances. Furthermore, the developed 7-core MC-EDFAs maintain gains above ~18 dB and ~21 dB over the full C and L Bands, respectively, at an input power of −5 dBm, effectively compensating for span losses of submarine fiber cable. This successful field demonstration marks a crucial step towards the commercial implementation of integrated MC-EDFA SDM submarine optical communication systems for practical high-capacity applications.</p>

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High-capacity optical communication relayed by multi-core amplifier on deployed submarine seven-core fiber cable

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月11日

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  • Yingyu Chen,
  • Jinkai Zhou,
  • Yaolin Wu,
  • Hanyu Gao,
  • Yongguang Xiao,
  • Bofan Guo,
  • Jinpei Li,
  • Wenhao Li,
  • Ruqi Chen,
  • Runzhou Qiu,
  • Jiajing Tu,
  • Cheng Du,
  • Lei Shen,
  • Xiaozhen Xie,
  • Yuelin Yan,
  • Guangquan Wang,
  • Ying Yu,
  • Zhengyong Liu,
  • Shecheng Gao,
  • Zhaohui Li,
  • Chao Lu

摘要

Space division multiplexing (SDM), particularly multi-core fiber (MCF) technology, represents a promising solution for high-density cabling in duct-constrained scenarios such as submarine cable systems. Although recent laboratory experiments and prototype trials have demonstrated the feasibility of MCF-based submarine cables, a complete optical communication validation of a real-world MCF submarine cable link incorporating optical amplifiers has remained a critical necessity. Here, we demonstrate a field validation of the MCF submarine cable communication with an end-to-end system. Based on a field-deployed 7-core fiber submarine cable infrastructure, we achieved a record-breaking net transmission rate of 410.5 Tbit·s-1 over a 140 km 7-core fiber cable link by employing the matched C + L Band cladding-pumped 7-core MC-EDFA. The measurements indicate slight variation in attenuation and crosstalk compared to the pre-cabling conditions, confirming the MCF’s robustness to deployment and submarine disturbances. Furthermore, the developed 7-core MC-EDFAs maintain gains above ~18 dB and ~21 dB over the full C and L Bands, respectively, at an input power of −5 dBm, effectively compensating for span losses of submarine fiber cable. This successful field demonstration marks a crucial step towards the commercial implementation of integrated MC-EDFA SDM submarine optical communication systems for practical high-capacity applications.