Abstract
A polarization-division-multiplexing (PDM)-based bi-directional fibre-free-space optical (FSO) integration with two reflective semiconductor optical amplifiers (RSOAs) scheme to efficiently wipe off the modulated data for upstream modulation is proposed and successfully demonstrated. For downstream modulation, a high-speed 128 Gb/s vestigial sideband (VSB)-four-level pulse amplitude modulation (PAM4) fibre-FSO integration is feasibly established. The transmission capacity is increased up to four times through PDM operation and VSB-PAM4 modulation. For uplink transmission, a 10 Gb/s non-return-to-zero fibre-FSO integration with two RSOAs scheme to effectually erase the downstream modulated data is practically constructed. The upstream performance exhibits noticeable enhancement by using of two RSOAs scheme to wipe off the modulated data clearly. Such illustrated PDM-based bi-directional 128 Gb/s (downstream)/10 Gb/s (upstream) fibre-FSO integration is shown to be prominent not only due to its enhancement in the convergence of fibre backhaul and optical wireless reach extender but also because of its benefit in bi-directional transmission for affording high transmission capacity with long-reach optical wireless link and improved upstream performance.
Highlights
Broadband access network is considered as an attractive frontier for providing present and emerging technologies, such as fifth-generation mobile communications, immersive virtual reality and augmented reality, 4K video streaming, and high-speed Internet[1,2,3,4,5]
The transmission performance of the directly modulated vertical-cavity surface-emitting laser (VCSEL) transmitter-based fibre-free-space optical (FSO) integration will be degraded by fibre dispersion-induced distortions due to a long-haul fibre transmission
Adopting a dispersion compensation device (DCD) within the fibre transmission is necessary to compensate for the fibre chromatic dispersion and reduce the fibre dispersion-induced distortions accordingly[32,33]
Summary
Broadband access network is considered as an attractive frontier for providing present and emerging technologies, such as fifth-generation mobile communications, immersive virtual reality and augmented reality, 4K video streaming, and high-speed Internet[1,2,3,4,5]. A real-time PAM4 fibre-FSO and fibre-wireless hybrid system with parallel/orthogonally polarized dual-wavelength scheme was presented[27] It is difficult for a practical implementation in real networks due to uni-directional transmission. A PDM-based bi-directional fibre-FSO integration with two RSOAs scheme for affording high channel capacity (128-Gb/s (downstream)/10-Gb/s (upstream)) with long-reach free-space transmission (200 m) and enhanced upstream performance is thereby demonstrated to meet the targets. For in-building network application, a 200-m free-space transmission can greatly satisfy the requirement for in-building transmission distance This demonstrated PDM-based bi-directional fibre-FSO integration is designed as a promising framework due to its enhancement in the integration of fibre backhaul and in-building network and because of its advantage in two-way communication for providing high transmission capacity with long-range optical wireless link and enhanced upstream performance
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