Hybrid Self-Protected Fiber-FSO WDM-PON System with Fiber Breakage Prevention

Ching Hsuan Hsu, Syu Yang Jiang, Shang En Hsieh, Chien Hung Yeh*, Yu Ting Lai, Lan Yin Chen, Shien Kuei Liaw, Chi Wai Chow

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


In this research, we present and design a blended wavelength-division-multiplexing passive optical network (WDM-PON) architecture to deliver both baseband and free-space optical (FSO) signals by using two wavelength bands over an available bandwidth to avoid the signal interference. Only using few additional components in the optical line termination (OLT) and optical network unit (ONU)/optical wireless unit (OWU) can achieve self-protected operation in the presented hybrid fiber-FSO access network against fiber breakage. In the measurement, eight WDM wavelengths with 24.3 Gbit/s on-off keying (OOK) modulation format are applied to verify and discuss the bit error rate (BER) performances of baseband and FSO signals, respectively, through 25 km fiber and 2 m wireless FSO connections. Therefore, the presented PON not only can deliver both baseband and FSO traffics, but can also provide a self-restored mechanism against fiber fault.

Original languageEnglish
Article number822
Issue number11
StatePublished - Nov 2022


  • free-space optical (FSO)
  • passive optical network (PON)
  • Rayleigh backscattering (RB)
  • self-healing
  • wavelength division multiplexing (WDM)


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