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<p>This study presents a hybrid wavelength-division-multiplexing passive optical network (WDM–PON) architecture incorporating free-space optical (FSO) transmission to enable flexible short- and long-reach fiber connectivity. To enable bidirectional WDM FSO traffic transmission, the available wavelength band can be divided into four windows to mitigate Rayleigh backscattering-induced interferometric noise. Moreover, the proposed FSO–PON network can provide the short and long-reach fiber-FSO signal transmission simultaneously through same distributed fiber path. In the measurement setup, 24 WDM wavelengths are allocated across four distinct bands, which are interchangeable for both downlink and uplink transmission. Each band supports transmission over fiber spans ranging from short- to long-reach distances. Here, the performance of each FSO wavelength is systematically characterized and discussed. Furthermore, the power sensitivity obtained for each WDM FSO signal under the forward error correction criterion indicates that the redundant power budget is adequate to sustain reliable wireless FSO transmission.</p>

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An integrated WDM FSO–PON network enabling long- and short-reach fiber-wireless transmission

  • 期刊论文

  • 发表日期：

    2025年11月21日

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  • Yu-Heng Lin,
  • Chien-Hung Yeh,
  • Shien-Kuei Liaw,
  • Wen-Piao Lin,
  • Zi-Gang Huang,
  • Nai-Yi Lu

摘要

This study presents a hybrid wavelength-division-multiplexing passive optical network (WDM–PON) architecture incorporating free-space optical (FSO) transmission to enable flexible short- and long-reach fiber connectivity. To enable bidirectional WDM FSO traffic transmission, the available wavelength band can be divided into four windows to mitigate Rayleigh backscattering-induced interferometric noise. Moreover, the proposed FSO–PON network can provide the short and long-reach fiber-FSO signal transmission simultaneously through same distributed fiber path. In the measurement setup, 24 WDM wavelengths are allocated across four distinct bands, which are interchangeable for both downlink and uplink transmission. Each band supports transmission over fiber spans ranging from short- to long-reach distances. Here, the performance of each FSO wavelength is systematically characterized and discussed. Furthermore, the power sensitivity obtained for each WDM FSO signal under the forward error correction criterion indicates that the redundant power budget is adequate to sustain reliable wireless FSO transmission.