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<p>The integration of fixed and mobile optical access networks can enhance resource utilization, reduce network complexity, and lower deployment costs. Here, we report a field trial demonstrating the integration of hardware-efficient coherent optical transmission and high-fidelity analog waveform delivery over a single optical carrier for converged fixed-mobile networks, enabled by the proposed amplitude-phase layered modulation. This approach not only simplifies the digital coherent reception for fixed optical access, but also enhances analog transmission by enabling signal-to-noise ratio adaptation for 6G mobile front-haul. We experimentally validate the proposed scheme in a 109-km field-deployed fiber link in Hong Kong. A 128 Gb/s phase-insensitive digital coherent transmission is successfully integrated with 20-GHz aggregation bandwidth wireless signals, supporting single-wavelength 1.2 Tb/s common public radio interface equivalent data rate and 256-ary quadrature-amplitude-modulation format. Using this scheme, the fixed optical access achieves a power budget exceeding 38.6 dB, while analog mobile front-haul signals reach signal-to-noise ratios above 47.2 dB and support modulation formats up to 16384-ary quadrature-amplitude-modulation. These results highlight the potential of this solution to unlock the capacity of existing and future fiber-optic infrastructures by converging fixed access, mobile access, and metro networks within a unified framework that enhances scalability and simplifies network deployment.</p>

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Integrating fixed and mobile coherent optical access networks for unified broadband services

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月4日

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  • Qi Wu,
  • Zixian Wei,
  • Xiaoying Zhang,
  • Haiqiang Wei,
  • Jiahao Huo,
  • Xinran Huang,
  • Tonghui Ji,
  • Zhaopeng Xu,
  • Chao Lu,
  • Alan Pak Tao Lau,
  • Kangping Zhong

摘要

The integration of fixed and mobile optical access networks can enhance resource utilization, reduce network complexity, and lower deployment costs. Here, we report a field trial demonstrating the integration of hardware-efficient coherent optical transmission and high-fidelity analog waveform delivery over a single optical carrier for converged fixed-mobile networks, enabled by the proposed amplitude-phase layered modulation. This approach not only simplifies the digital coherent reception for fixed optical access, but also enhances analog transmission by enabling signal-to-noise ratio adaptation for 6G mobile front-haul. We experimentally validate the proposed scheme in a 109-km field-deployed fiber link in Hong Kong. A 128 Gb/s phase-insensitive digital coherent transmission is successfully integrated with 20-GHz aggregation bandwidth wireless signals, supporting single-wavelength 1.2 Tb/s common public radio interface equivalent data rate and 256-ary quadrature-amplitude-modulation format. Using this scheme, the fixed optical access achieves a power budget exceeding 38.6 dB, while analog mobile front-haul signals reach signal-to-noise ratios above 47.2 dB and support modulation formats up to 16384-ary quadrature-amplitude-modulation. These results highlight the potential of this solution to unlock the capacity of existing and future fiber-optic infrastructures by converging fixed access, mobile access, and metro networks within a unified framework that enhances scalability and simplifies network deployment.