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A two-way 224-Gbit/s PAM4-based fibre-FSO converged system
Hai-Han Lu1, Chung-Yi Li2, Wen-Shing Tsai3
1Institute of Electro-Optical Engineering, National Taipei University of Technology, Taipei, 10608, Taiwan. hhlu@ntut.edu.tw.
Scientific Reports
|January 11, 2022
Summary
A novel two-way fibre-free-space optical converged system achieves 224 Gbps using dual-wavelength, polarization-multiplexed PAM4 signaling. This integrated approach enhances capacity and simplifies deployment for high-speed data transmission.
Area of Science:
- Optical Communications
- Wireless Networks
- Telecommunications Engineering
Background:
- Traditional fibre and free-space optical (FSO) systems face limitations in capacity and deployment flexibility.
- Integrating fibre backbones with FSO extensions offers a promising solution for enhanced network performance.
Purpose of the Study:
- To construct and demonstrate a two-way fibre-FSO converged system.
- To achieve high data rates through advanced modulation and multiplexing techniques.
- To evaluate the transmission performance over combined fibre and free-space links.
Main Methods:
- Utilized a two-way transmission architecture for fibre-FSO converged systems.
- Employed dual-wavelength, four-level pulse amplitude modulation (PAM4) with polarization-multiplexing.
- Integrated 25-km single-mode fibre (SMF) transport with 500-m free-space transmission.
Main Results:
- Successfully demonstrated a 224 Gbit/s transmission capacity (56 Gbit/s PAM4/wavelength × 2 wavelengths × 2 polarizations).
- Achieved high downlink and uplink data rates with excellent transmission performance.
- Observed good bit error rates and clear PAM4 eye diagrams over the combined 25-km SMF and 500-m FSO links.
Conclusions:
- The proposed two-way fibre-FSO converged system effectively integrates fibre backbone with optical wireless extension.
- This system offers significant advantages in capacity doubling and simplified setup for high-capacity data transmission.
- The demonstrated system provides a robust solution for high downlink/uplink data rates with reliable performance.
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