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The rapid growth of data-intensive applications demands optical communication systems with higher bandwidth and improved transmission capacity. Free-space optical (FSO) links offer a compelling solution owing to their high data rates, license-free spectrum, and enhanced security. However, conventional multiplexing schemes such as wavelength-division multiplexing (WDM) and mode-division multiplexing (MDM) face limitations from crosstalk and modal dispersion, constraining further capacity enhancement. To address these challenges, this work proposes a hybrid multimode fiber/FSO (HMMF-FSO) system that integrates orbital angular momentum (OAM) multiplexing with polarization-division multiplexing (PDM). The proposed architecture employs six distinct OAM modes with dual polarization states, resulting in 12 channels and a total capacity of 120 Gbps over a single 1550 nm wavelength. Simulation results demonstrate a maximum FSO reach of 21 km under clear atmospheric conditions with an additional 1 km multimode fiber link. In adverse weather, the achievable ranges reduce to 3.25 km, 2.4 km, and 1.45 km for low, medium, and high rain, respectively, and 2.55 km, 1.66 km, and 1.32 km for light, medium, and high fog. Eye diagram and bit-error-rate analysis confirm the system’s resilience and potential for high-capacity, long-range FSO communication under varying atmospheric conditions.

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Long Haul Optical Transmission Using Multi-channel OAM-PDM Multiplexing over HMMF-FSO Communication System

  • 会议论文

  • 发表日期：

    2026年

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  • Sami-ul Islam Nahid,
  • Arajit Saha,
  • Md. Shihab Sharar Oyon,
  • Zahid Hasan Rifat,
  • M. Reefaz Rahman,
  • Mahmoodul Islam,
  • Md. Kabiruzzaman,
  • Rinku Basak,
  • Mohammad Nasir Uddin

摘要

The rapid growth of data-intensive applications demands optical communication systems with higher bandwidth and improved transmission capacity. Free-space optical (FSO) links offer a compelling solution owing to their high data rates, license-free spectrum, and enhanced security. However, conventional multiplexing schemes such as wavelength-division multiplexing (WDM) and mode-division multiplexing (MDM) face limitations from crosstalk and modal dispersion, constraining further capacity enhancement. To address these challenges, this work proposes a hybrid multimode fiber/FSO (HMMF-FSO) system that integrates orbital angular momentum (OAM) multiplexing with polarization-division multiplexing (PDM). The proposed architecture employs six distinct OAM modes with dual polarization states, resulting in 12 channels and a total capacity of 120 Gbps over a single 1550 nm wavelength. Simulation results demonstrate a maximum FSO reach of 21 km under clear atmospheric conditions with an additional 1 km multimode fiber link. In adverse weather, the achievable ranges reduce to 3.25 km, 2.4 km, and 1.45 km for low, medium, and high rain, respectively, and 2.55 km, 1.66 km, and 1.32 km for light, medium, and high fog. Eye diagram and bit-error-rate analysis confirm the system’s resilience and potential for high-capacity, long-range FSO communication under varying atmospheric conditions.